• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a rectifier circuit comprising a three-phase rectifying arrangement (1) of semiconductor valves (2), preferably a bridge rectifier circuit of diodes, the rectifying arrangement (1) having a three-phase line-side input (3) and a DC-side output (4), and at least one of three phases (U, V, W) at the network input (3) is connected to a first pole terminal (A) of a three-pole circuit (5) for deriving an injection current (ih3) into the three-pole circuit (5). According to the invention, each phase (U, V, W) can be connected in each case to a switching element (S1, S2, S3) to the first pole connection (A) of the three-pole circuit (5), and a second and third pole connection (B, C ) of the three-pole circuit (5) is in each case connected to an output line (PDC, NDC) of the DC-side output (4) for control currents (icp, icn), the three-pole circuit (5) controlling the controllable semiconductor valves (Scp +, Scp-, Scn +, Scn -), Preferably IGBTs, for active control of the control currents (icp, iCn) and / or the injection current (ih3), and at least one throttle (7) on one of the output lines (PDC, NDC) is arranged on the DC side output (4) , and a time-varying load (6) on the DC side output (4) is provided.
    公开号:AT512752A1
    申请号:T387/2012
    申请日:2012-03-30
    公开日:2013-10-15
    发明作者:Michael Dr Hartmann；Rudolf Fehringer
    申请人:Schneider Electric Power Drives Gmbh；
    IPC主号:
    专利说明:

    1 F / Sf / 44885
    Rectifier circuit with current injection
    FIELD OF THE INVENTION
    The present invention relates to a rectifier circuit having a three-phase
    Rectification arrangement of rectification valves, preferably a bridge rectifier circuit of diodes, the rectification arrangement having a three-phase network input and a DC output, and at least one of three phases at the network input being connected to a first pole terminal of a three-pole circuit for deriving an injection current into the three-pole circuit; according to the preamble of claim 1.
    The present invention further relates to a method for impressing control currents into a DC-side output of a rectifier circuit having a three-phase rectification arrangement of
    Semiconductor valves, preferably a three-pole
    Bridge rectifier circuit of diodes, wherein a Inj ektionsstrom. is branched off from at least one of the three phases at a network-side input of the rectifier circuit, according to the preamble of claim 18.
    STATE OF THE ART
    In modern power electronics, a variety of different embodiments of passive, active and hybrid forms, so-called hybrid rectifier circuits are known. The various rectifier circuits provide substantially constant DC voltage at the output of the rectifier circuit from the line-side, sinusoidal voltages at the input. A commonly used rectification arrangement represents the known from the prior art, especially in power electronics, known three-phase (six-pulse) bridge rectification arrangement (B6 circuit) of rectifier diodes. This is from a three-phase 2 F / Sf / 44885
    Three-phase network (the so-called AC side of the rectifier circuit) generates a rectified voltage by means of a bridge arrangement of diodes after the bridge arrangement (the so-called DC side of the rectifier circuit).
    To reduce the resulting by the rectifier circuit pulse-shaped currents at the AC side input of the rectifier and to smooth the rectifier output voltage or the rectifier output current inductors (chokes) are often switched DC rectifier output of the diode bridge and output capacitor. In generic rectifier circuits, the rectifier current is passed through a choke, connected to an output capacitor in parallel with the output, to reduce distortion in the mains currents, and to smooth the course of the rectifier current and to provide a constant output voltage at the output or output capacitor.
    The network-side current profile of a rectifier circuit with switching elements, inductances and / or capacitances, even during operation with a passive (ohmic) load or another electronic circuit on the DC voltage side, is not sinusoidal in a conventional manner. The non-sinusoidal currents cause due to their harmonic content and the phase shift relative to the mains fundamental unwanted network-side voltage or. Current distortions. Especially in rectifier circuits higher power these network perturbations are not negligible. It is necessary to keep a level of the summed power of all harmonics in relation to the power of the fundamental (THDi, stands for "Total Harmony Distortion of currents" or "total harmonic distortion of currents"), whereby the maximum distortions of the mains currents and mains voltages by standards ( eg IEC61000-3-2). 3F / Sf / 44885
    From the prior art it is known that the current shapes of the rectifier circuit can be influenced by adding or deriving currents, the so-called injection currents: currents are additionally impressed by additionally arranged switching elements, preferably in the currentless phases of the diode bridge currents. The current required for this purpose essentially has a frequency which is three times the mains frequency, whereby this type of current injection is referred to as third harmonic current injection in the literature for improving the network perturbations produced by the rectifier circuit. The most well-known representative of such a rectifier system and prior art is here called the so-called Minnesota Rectifier.
    The rectifier structure known in the art as the Minnesota rectifier employs injection of a current at a third harmonic of the line frequency simultaneously into all three phases of the AC terminal of the rectifier circuit to achieve approximately sinusoidal line currents of the rectifier circuit. It will be filled by those power gaps, which would not conduct electricity due to the blocking effect of the rectifier arrangement at the network input. By a suitable choice of the injection current, the distortion of the mains currents can thus be largely avoided and thus a better THDi can be achieved.
    The circuit of the Minnesota Rectifier shows the significant disadvantage that the necessary currents in all three phases are impressed simultaneously and thereby low-frequency loaded feed transformers must be used which due to the low-frequency load with the third harmonic of the mains both a large volume and a large weight exhibit. The generation of the injection current is accomplished in the circuit of the Minnesota Rectifier by two, DC side arranged boost converter stages. This allows 4 F / Sf / 44885 to provide a regulated output voltage filtered by a sufficiently large output capacitor. However, the use of boost converters on the DC side of the rectifier introduces two diodes into the primary power flow of the rectifier circuit, resulting in a significant reduction in efficiency, particularly in the high power sector. A selective impression of the required injection current only in that AC-side phase, which would remain de-energized in the classic 6-pulse rectifier operation is possible, but requires additional active switch to select the respective phase. For this, however, the injection current of the rectifier circuit must be adjusted. However, such an operation is not possible with the topology of the Minnesota Rectifier.
    Other prior art rectifier circuits using the concept of third harmonic injection can operate only in parallel with the load of the rectifier circuit and without the use of the DC side choke or without the use of a significant output capacitor. In such existing circuits, in order to obtain approximately sinusoidal current, both the pulsating output voltage of the bridge rectifier and a constant power load, ie a load which receives the required power regardless of the voltages provided, is required. Rectifier circuits with technically advantageous throttle and capacity on the DC side output can therefore not be used. For the operation of many power electronic circuits is a sufficiently good smoothing and supporting the output voltage and therefore a sufficiently large Au.sgangskondensator essential. Topologies of this kind can therefore not be used in such applications. 5 F / Sf / 44885
    An essential, as optimal as possible rectification while avoiding the network distortions is therefore not given in known in the art rectifier circuits with current injection.
    OBJECT OF THE INVENTION
    It is therefore the object of this invention to avoid these disadvantages and to improve a rectifier circuit with current injection as well as a method of impressing control currents in such a way that low network perturbations of the rectifier circuit occur, wherein as sinusoidal input current as possible should be present in phase with the respective mains voltages , no large magnetic components on the AC side of the
    Rectifier circuit are required, pulse-shaped injection of the control current to the output of the rectifier circuit is avoided, no large AC or DC side arranged filter capacitors are needed, and the efficiency of the
    Rectifier circuit is improved.
    PRESENTATION OF THE INVENTION
    These objects are achieved by the features of claim 1 and claim 18.
    Claim 1 relates to a rectifier circuit with a three-phase rectification arrangement of
    Semiconductor valves, preferably a
    A bridge rectifier circuit of diodes, wherein the rectification arrangement comprises a three-phase line side input and a DC side output, and at least one of three phases at the line side input is connected to a first pole terminal of a three-pole circuit for deriving an injection current into the three-pole circuit. According to the invention, it is provided that each phase in each case with a switching element to the first pole terminal of the three-pole 6 F / Sf / 44885
    A second and third pole terminal of the three-pole circuit is in each case connected to an output line of the DC-side output for control currents, the three-pole circuit having controllable semiconductor valves, preferably IGBTs, for actively controlling the control currents and / or the injection current, and at least one Throttle is arranged on one of the output lines at the DC side output, and a time-varying load is provided at the DC side output.
    In addition to the known rectification arrangement, the circuit according to the invention has a three-pole circuit for injecting injection currents. Each individual phase of the network can be connected by means of switching element with the three-pole circuit, wherein the so-called injection current is taken from the network and the rectifier currents is added as a control current. The inventive circuit allows variable load operation on the dc side output of the rectifier circuit since the control currents from the three-pole circuit can be controlled by active semiconductor controllable active control elements in the three-pole circuit according to the load. Passive components such as resistors, capacitors or inductors, as used in conventional circuit topologies of rectifier circuits using the injection principle, are not sufficiently suitable for this purpose. Controllable semiconductor valves in the form of IGBTs with antiparallel free-wheeling diodes are preferably provided as active components, although any type of disconnectable valves which can be used for controlling the switching states (for example MOSFETs, GTOs,. In the description of the present invention, the term controllable semiconductor valves is used to represent all controllable switching elements.
    The use of a DC-side choke in combination with a sufficiently large output capacitor 7 F / Sf / 44885 to obtain rectified, constant output voltages is possible without affecting the function of the rectifier circuit and to obtain high network distortions. The entire power of the rectifier circuit is guided at the DC-side output through the throttle. A voltage resulting from the rectification arrangement with alternating portions can drop across the inductor, with a rectified voltage remaining at the output and being able to be supplied to the load. In particular, conventional rectifier circuits with choke and output capacitor can be easily expanded by means of the three-pole circuit.
    According to a further preferred embodiment of the invention, it is provided that the second and third pole terminal of the three-pole circuit is connected in each case via a second and third inductance with one of the two output lines of the DC side output, and between the second or third pole terminal and the load, the throttle is.
    A differential voltage across the inductors forms the basis for controlling the control currents and the injection current. The respective currents, that is the control currents and / or the injection current, are set by modulation of the active components in the three-pole circuit. The switching operations for the modulation of currents by means of active components are known per se in power electronics. By the inductances at the terminals of the three-pole circuit, the currents are smoothed and an impression of pulsed currents in the DC side output can be avoided. As a result, expensive filter capacitors having large capacitance values are sometimes saved, which would receive the pulsed currents resulting from the switching operation of the active components in a conventional manner. The choke on the DC-side output carries both the rectifier currents and the impressed control currents and ensures continuous characteristics of the output variables. 8 F / Sf / 44885
    In a further preferred embodiment of the invention, provision is made for the first pole terminal to be connected to the switching elements via a first inductance, the three inductances being implemented by means of a 3-limb throttle. The implementation of the three inductors by means of a conventional 3-leg throttle is a particularly space-saving, cheap and easy to implement variant, each leg winding of the 3-leg throttle forms an inductance.
    According to a further embodiment of the rectifier circuit according to the invention, it is provided that the two output lines are connected to an output capacitor at the DC-side output. This output capacitor essentially serves to obtain a constant output voltage in cooperation with the throttle, with an existing alternating component falling in the voltage loop between the inductor and the output capacitor at the inductor, and the output capacitor holding a constant, rectified output voltage. An output capacitor in parallel with the output terminal of the rectifier circuit is also provided, inter alia, by the downstream operation of power electronic circuits, such as e.g. a three-phase inverter stage needed.
    In a further preferred embodiment of the invention it is provided that each of the three phases is connected at the network input in each case with a filter capacitor, wherein the filter capacitors are connected in a star-shaped star point together. Furthermore, it is provided that the three-pole circuit is connected via at least one bypass capacitor to the network-side input. The leakage capacitor of the three-pole circuit, in combination with the filter capacitors arranged in a star shape, forms an advantageous current path for discharging currents, 9 F / Sf / 44885, arising from high-frequency switching operations in the three-pole circuit.
    Furthermore, according to a " Another preferred embodiment of the invention provides that the three-pole circuit comprises three converter systems with controllable semiconductor valves and / or a bidirectional switch, wherein the first pole of the three-pole circuit on a first converter system, the second pole of the three-pole circuit on a second converter system, as well as on a third converter system, the third pole terminal of the three-pole circuit is provided, and of all three converter systems, a connection to a branch point, a common center of the three-pole circuit is provided.
    The three converter systems are used to memorize the two control currents and the injection current with appropriate control. Each of the converter systems provides one degree of freedom for the regulation of the three streams, namely the two control streams and the injection stream. By means of the advantageous embodiment of controllable half-liter valves and / or a bidirectional switch in a bridge structure, the degrees of freedom can be used to control the control currents.
    Furthermore, it is provided according to a preferred embodiment of the invention that the first converter system is provided as a 3-level bridge branch, wherein the second and third converter system are provided as a half-bridge, and the three converter systems are carried out by means of three parallel-connected branches, with electronic components are arranged, wherein on a first branch, the first pole terminal of the three-pole circuit is executed, and on a third branch of the second and third pole terminal are executed, and each of the branches has a mid-point connection, about which midpoint terminals, the components of the branches are arranged symmetrically a first * * F / Sf / 44B85 ίο
    Center terminal of the first branch is connected via a bidirectional switch to a second center terminal of the second branch, and the second center terminal is directly connected to a third center terminal of the third branch, wherein the third center terminal is provided as the center of the three-pole circuit. The first converter system is designed as a known 3-level bridge branch, and can be provided unidirectionally or bidirectionally, as will be explained below. The converter systems two and three, consist of two half-bridges, however, can also be designed as a three- or multi-stage bridge branch.
    The first pole is provided at the first branch and the injection current flows into the first center terminal and thus into the three-pole circuit. The three branches connected in parallel in this way together represent the three converter systems as bridge structures with which bridge structures the control currents and the injection current can be regulated.
    Alternatively, according to a further preferred embodiment of the invention, it is provided that the three-pole circuit comprises two converter systems with controllable semiconductor valves, preferably arranged in a bridge structure, the second pole terminal of the three-pole circuit being connected to a second converter system, and the third pole terminal being connected to a third converter system three-pole circuit is provided, and from both converter systems, a connection to a branch point, a common center, is provided, and the center is connected to the first pole terminal. According to this alternative embodiment of the invention, the first converter system is omitted and the first pole of the three-pole circuit is directly connected to the center of the two remaining converter systems. I11 • · * «•« • ·
    • «« • · * · • · · · «F / Sf / 44885
    According to a further preferred embodiment of the invention it is provided that the second and third converter system are provided as a half-bridge, wherein the two converter systems are implemented by means of two parallel-connected branches, and connected to a second branch of the first pole terminal of the three-pole circuit, and at one third branch of the second and third pole terminal are executed, and each of the branches has a mid-point terminal around which mid-point terminals the components of the branches are arranged symmetrically, and- a second midpoint terminal of the second branch is directly connected to a third midpoint terminal of the third branch, wherein the third center terminal is provided as the center of the three-pole circuit. According to this embodiment of the three-pole circuit, no first branch is provided, which is connected by means of switches, but only one embodiment with two half-bridges as converter systems, with which two degrees of freedom for controlling the voltage and current sizes of the bridge structures are present. The direct connection of the first pole of the three-pole circuit with the center of the three-pole circuit and thus the two converter systems defines the potential at this point and both the two control currents and the injection current can be controlled with the two remaining converter systems.
    For component assembly of the branches, it is provided according to a further preferred embodiment that two buffer capacitors are connected in series on the second branch, the second midpoint terminal being arranged between the two buffer capacitors. Furthermore, it is provided according to a preferred embodiment that in the first branch two bridge valves, preferably diodes, are connected in series with the same passage direction, wherein the first center connection is arranged between the two bridge valves. Such an arrangement of diodes means a unidirectional design of the first converter system. A unidirectional design of the first converter system 12 F / Sf / 44885 allows a current guidance due to the diodes in one direction only, whereby an energy transfer from the network is set in the three-pole circuit. According to a further preferred embodiment, it is provided that the two bridge valves are designed as controllable semiconductor valves, preferably IGBTs. Such an arrangement of controllable semiconductor valves instead of diodes means a bi-directional design of the first converter system. A bidirectional design of the first converter system makes it possible, with appropriate control of the three converter systems, to minimize the voltage across the buffer capacitors, since the required currents in the three-pole circuit are no longer limited by the flow direction of the bridge valves of the first converter system. As a result, the maximum voltage of the buffer capacitors can be advantageously reduced.
    According to a further preferred embodiment, it is provided that the four controllable semiconductor valves are provided in series on the third branch, wherein the center of the three-pole circuit is arranged in the connection between two series-connected pairs of controllable semiconductor valves, and the second pole connection between the controllable semiconductor valves of the first pair is provided, and the third pole terminal is provided between the controllable semiconductor valves of the second pair. At these Eolanschlüssen the control currents flow in the DC-side output lines. The respective control currents can now be regulated by the two half-bridges by suitable control of the controllable semiconductor valves. The voltages of the buffer capacitors used are decisive for the voltage conditions at the second and third pole connection and therefore also decisive for the ripple current occurring in the inductors.
    According to a further preferred embodiment of the invention, it is provided that the second center terminal is connected to the first pole terminal via a voltage source. Of the • * • ·
    t. I * F / Sf / 44885 13 second midpoint connection is directly connected to the midpoint. In order to dynamically increase or decrease the potential of the center of the three-pole circuit, the center of the converter systems can be connected to the first pole connection via a voltage source. By means of a potential increase or decrease by the voltage source, the currents of the three-pole circuit can be controlled without distortion even with small potential differences, as they occur in principle in the direct connection of the first Polanschlusses with the center of the converter systems.
    In a further embodiment of the rectifier circuit according to the invention, it is provided that the second and third converter system of the three-pole circuit is designed with bidirectional 3-level bridge branches known per se, preferably two so-called three-level neutral-point clamped converters (3L-NPC), wherein the 3-level bridge arms are arranged symmetrically about a midpoint branch connected in parallel to the 3-level bridge branches, and the midpoint branch is designed as two series-connected buffer capacitors, and the mid-point between the two buffer capacitors is provided, and a neutral level of the 3-level Brückenzweigs is connected to the center and the first pole terminal, and an AC terminal of the 3-level bridge branch as the second pole terminal and the third pole terminal of the three-pole circuit are provided. The use of two 3-level bridge branches represents a particularly advantageous embodiment of the invention, since the first converter system is not required in this embodiment and thereby the efficiency of the entire rectifier system can be increased and also the control currents can be generated as possible distortion-free. The control of the control currents can be accomplished by known control of the controllable semiconductor valves of the 3-level bridge branch and the injection current is given by the V β Λ 4 • ** 14 F / Sf / 44885
    Condition icp = ih3 + iCn The described embodiment provides a bidirectional three-pole circuit.
    According to a further preferred embodiment of the invention, it is provided that the three-pole circuit is connected to the first pole terminal in each case with one side of two injection capacitors, which connection forms the center of the three-pole circuit, wherein the two other sides of the injection capacitors are connected via a voltage source and Form connection points, wherein in each case from the connection points starting a current loop is provided, each with a buffer capacitor and a pair of controllable semiconductor valves, and between the two controllable semiconductor valves of a pair of the second pole terminal and the third pole terminal is provided. The control of the control currents is still done by suitable control of the two half-bridges. At sufficiently high amplitude of the voltages of the additional voltage source, the two control currents can be performed largely distortion-free by this design.
    Claim 18 relates to a method for impressing control currents in a DC-side output of a rectifier circuit with a three-phase
    Rectifying arrangement of semiconductor valves, preferably a three-pole bridge rectifier circuit of diodes, wherein an injection current of at least one of the three phases is impressed on a network-side input of the rectifier circuit. According to the invention, it is provided that the injection current is supplied to a first pole terminal of a three-pole circuit, and the regulation of the injection current and / or the control currents by means of active components, preferably controllable semiconductor valves, in the three-pole circuit, as well as the rectifier currents on two DC-side output lines, the control currents be added via a second and third pole terminal of the three-pole circuit, and at least passed through a throttle arranged on the 15 F / Sf / 44885 DC output.
    The inductor current is composed of the rectifier arrangement rectified current and control currents. The choke in combination with the output capacitor smoothes out the output current and provides a constant output voltage. The supply of the injection current takes place only in that phase which would remain de-energized due to the operation of the six-pulse rectifier circuit and allows, with appropriate control, the generation of sinusoidal rectifier input currents in phase with the mains voltages which reduces the network feedback effects of the rectifier structure. Since the additionally introduced three-pole circuit processes only a fraction of the energy of the entire rectifier circuit, substantially better overall efficiency can be achieved in comparison to conventional low-feedback, active rectifier circuits. In particular, the method according to the invention offers the possibility of expanding existing conventional rectifier circuits and of operating them with the extension with little retroaction on the grid. It is also possible to operate a variable load on the DC-side output by controlling the control currents depending on the load with known control of the active components.
    According to a further preferred embodiment of the invention, it is provided that the injection current and / or the control currents are passed through differential voltages across the inductances by at least two of three inductors provided on at least two of the three pole terminals for smoothing and controlling the currents, and by means of regulation of two of the three streams the third stream is set.
    With the method according to the invention, it is possible to operate rectifier circuits with low network distortions. The supplied control currents and the injection current are first smoothed by the inductors 16 F / Sf / 44885, without receiving pulse-shaped currents from the rectification arrangement at the output. In generic rectifier circuits usual, large capacity for filtering the pulses of the rectifier currents and any injection currents are avoided. Furthermore, the differential voltage across the inductors is the basis to carry currents through the inductors and thus into the three-pole circuit and out of this. The current sum of the currents at the pole terminals of the three-pole circuit of the rectifier circuit according to the invention results in zero. High-frequency switching of the active devices in the three-pole circuit, especially when all three currents are controlled at the pole terminals, results in high-frequency movements of a midpoint voltage of the three-pole circuit. By using additional leakage capacitors, an additional high frequency current path can be provided. In the present embodiment, however, it is provided that two of the three currents are controlled at the pole terminals by means of active components in the three-pole circuit, wherein the third current results due to the zero current sum.
    According to a further preferred embodiment of the method according to the invention, it is provided that a midpoint voltage between the midpoint of the three-pole circuit and a neutral point is measured and an average value of the midpoint voltage is regulated with one of the converter systems. The measurement and filtering of the midpoint voltage, whereby the midpoint voltage is measured with respect to the neutral point (ground) of the network, allows the active control of this potential, which brings advantages in the generation of the control currents and the injection current, since this potential the control currents or . Determines the injection current. The potential difference, in particular that between the center point and the DC-side output lines and the 17 F / Sf / 44885 line-side input, is regulated by means of the active components in the three-pole circuit.
    In a further preferred embodiment of the invention, it is provided that the first buffer capacitor voltage at the buffer capacitor is regulated greater than a voltage of the positive output line against a neutral point, and a second buffer capacitor voltage at the buffer capacitor is regulated smaller than a voltage of the negative output line against the neutral point. The buffer capacitor voltages determine the differential voltages at the inductances of the pole terminals when switching the controllable semiconductor valves.
    According to a further preferred embodiment, it is provided that the regulation of the mean value of the midpoint voltage takes place by means of the controllable semiconductor valves. According to a preferred embodiment of the invention it is provided that the mean value of the midpoint voltage is regulated to zero.
    Due to the fact that the sum of all three currents of the three-pole circuit must necessarily result in zero, it is sufficient if only two converter systems are used to control the control currents and the injection current, since the third current is mandatory. As a result, advantageously, the remaining converter system can be used to regulate the center point voltage on average. Because of the temporal modulation, ie circuit, of the controllable semiconductor valves, the mean value of the center voltage is to be used. The mean value of the midpoint voltage can be regulated by means of the active components in the three-pole circuit. The methods for controlling the active components or change their switching states is known per se. If the midpoint voltage is averaged to zero with respect to the neutral point of the network, the amounts of the respective voltages on the buffer capacitors must be greater or smaller than those on the DC side 18 F / Sf / 44885
    Output lines relative to this center can be impressed accordingly.
    According to a further embodiment of the method according to the invention, it is provided that a first
    Buffer capacitor voltage is minimized at the buffer capacitor, and a second buffer capacitor voltage is minimized at the buffer capacitor, wherein the midpoint voltage is regulated to the negative half value of an injection voltage, and the injection voltage between the first pole terminal and the neutral point. The voltages of the two buffer capacitors are thereby minimized, the center point voltage being equal to the voltage occurring at the first pole connection of the three-pole circuit
    Neutral point, must be regulated. For this purpose, however, a bidirectional execution of the first converter stage according to claim 15 is necessary, since current and voltage this
    Converter system in this embodiment are not in phase.
    In a further preferred embodiment of the method according to the invention, it is provided for rectifier circuits according to claim 11 or 17 that the potential of the midpoint voltage with respect to one of the two can be adjusted by means of the regulation of the voltage source
    Output lines is increased or decreased. This is provided in order to obtain sufficiently large potential differences for controlling the control currents at the pole terminals. As a result, a distortion-free guiding of the control currents and the injection current can be ensured, which subsequently leads to distortion-free input currents of the
    Rectifier circuit leads.
    BRIEF DESCRIPTION OF THE FIGURES
    The invention will be explained in more detail below with reference to exemplary embodiments with the aid of the accompanying drawings. FIG. 4 shows a conventional embodiment of a conventional embodiment of the present invention. FIG
    2 a preferred embodiment of a rectifier circuit according to the invention with three converter systems, FIG. 3 a preferred embodiment of a rectifier circuit according to the invention with two converter systems, a preferred embodiment of a rectifier circuit with choke according to the invention, FIG. 4a the course of the three-phase mains at the mains input of the inventive system
    Rectifier circuit according to Figure 4, 4b, the course of an output voltage and a rectified voltage at the DC side output of an inventive
    The course of an injection current of the rectifier circuit according to the invention according to Figure 4, 4e the course of a negative rectifier current of the rectifier circuit according to the invention according to Figure 4, 20 F / Sf / 44885
    4f the course of a throttle current of a rectifier circuit according to the invention according to FIG. 4, FIG.
    4g the course of a control current of a rectifier circuit according to the invention according to FIG. 4, FIG.
    4h the course of a control current of a rectifier circuit according to the invention according to FIG. 4,
    5 shows an embodiment of the three-pole circuit of the rectifier circuit according to the invention with choke,
    6 shows a further preferred embodiment of a rectifier circuit according to the invention with choke,
    6a shows the profile of the mean value of a center point voltage of the rectifier circuit according to the invention in accordance with FIG. 6 when impressing a control current according to the invention, FIG.
    7 shows a further preferred embodiment of a rectifier circuit according to the invention with choke,
    Fig. 8 shows another embodiment of the three-pole
    Circuit of the invention
    Rectifier circuit with choke, as well
    Fig. 9 shows another embodiment of the three-pole
    Circuit of the invention
    Rectifier circuit with choke.
    WAYS FOR CARRYING OUT THE INVENTION
    1 shows a known rectifier circuit with a rectifying arrangement 1 of semiconductor valves 2, a 21 F / Sf / 44885 (six-pulse) bridge rectification arrangement with diodes, and with a DC-side choke 7. The rectifier circuit comprises a mains-side input 3 and a DC-side output 4 , wherein at the network-side input 3, the phases U, V, W are executed, and at the DC-side output 4, a positive output line Pdc and a negative output line NDC. At the rectification arrangement 1 is a rectified voltage Urec, wherein at the output a constant output voltage Uo is formed.
    In FIG. 1, a neutral point N, the mass potential of the network, is represented on the network side. At the DC side output 4 is connected to the output lines PDc / NDC a load 6, shown as a variable resistor, which receives a time-varying power Pö (t). Furthermore, an output capacitor Co is usually provided at the DC side output 4 between the output lines Pecc ^ dc. The load 6 is not shown in the other figures, since the connection takes place at the respective same location as in Figure 1. The load 6 may also be another electronic circuit, such as another power converter, wherein the rectifier circuit shown is then used as a so-called rectifier with voltage intermediate circuit. The entire power of the load 6 is transported via the throttle 7 from the network to the rectifier output, wherein the typical for the illustrated three-phase diode bridge with semiconductor valves 2 half-waves of the output voltage is smoothed by a choke 7 in combination with an output capacitor C0.
    However, the rectifier circuit shown in Figure 1 has a disadvantageous with respect to network perturbations execution. The rectifier circuit has, depending on the dimensioning of the arranged throttle 7, more or less pulse-shaped input currents with de-energized gaps at the network input 3 and therefore cause undesirable network perturbations with a 22 F / Sf / 44885 eventually required THDi the input currents can not be achieved.
    In order to improve the THDi, a rectifier circuit according to the invention according to FIG. 2 and FIG. 3 is provided. The rectifier circuit according to the invention with a rectification arrangement 1 additionally has a three-pole circuit 5. The three-pole circuit 5 has a first pole terminal A, a second pole terminal B and a third pole terminal C. The first pole terminal A is switchable with switching elements Si, S2, S3 at least one phase ü, V, W at the network-side connection. The second pole terminal B is connected to the positive output line PDC, and even before the throttle 7 connects to the load 6. The third pole terminal C is negative
    Output line Ndc connected.
    2 shows a rectifier circuit according to the invention with a first converter system 9, a second
    Converter system 10 and a third converter system 11 shown. The three-pole circuit 5 is constructed with converter systems 9, 10, 11, wherein the first converter system 9 is connected to the pole terminal A, a second converter system 10, a third converter system 11, and a center M. The second converter system 10 is connected to the pole terminal B and the center M, the third converter system 11 being connected to the pole terminal C and the center M. At least two of the
    Converter systems 9, 10, 11 have controllable semiconductor valves Scp +, Scp-, Scn + / Scn- for active control of control currents i cp r icn and / or of an injection current ih3. The first
    Converter system 9 is designed as a unidirectional or bidirectional 3-level bridge branch, wherein the second and third converter system 10,11 are designed as half-bridges.
    FIG. 3 shows a rectifier circuit 1 according to the invention with a second converter system 10 and a third 23 F / Sf / 44685
    Converter system 11 shown. A first converter system 9 is not provided, but the first pole terminal Ä is connected directly to the midpoint M. The converter systems 10, 11 have controllable semiconductor valves Scp +, Scp-, Sca +, Scn- for actively controlling control currents icp, icn and / or an injection current ih3.
    With the switching elements SlfS2, S3Wever a phase U, V, W is connected to the pole terminal A of the three-pole circuit 5, wherein a current path for the injection current ih3 is provided. Control currents icp, icn flow to the DC-side output 4 via the pole terminals B, C
    Injection current ih3 Network distortion avoided. The injection current required for sinusoidal input currents is evident as shown in FIGS. 4a to 4e
    Sections of the desired sinusoidal input currents together and has approximately triangular course as shown in Figure 4d.
    The three-pole circuit 5 according to the preferred embodiment of a rectifier circuit according to the invention according to FIG. 4 is used to implement the first one
    Converter system 9 a unidirectional 3-level bridge branch consisting of the two rectifier diodes Dh3 + and Dh3- on a first branch Zi and a bidirectional switch Sh3 from a first midpoint terminal Mi to a second midpoint terminal M2, the diodes Dh3 +, Dh3- the first midpoint terminal Mi with connect the positive and negative terminals of the buffer capacitors Ccp, Ccn, which buffer capacitors are provided on the second branch Z2. By means of the bidirectional switch Sh3, the first midpoint connection Mi is connected to the second midpoint connection M2 by switching on the bidirectional switch Sh3, and thus also via a conductive connection to the midpoint M of the three-pole circuit 5. The second converter system 10 and the third converter system 11 are provided by two half-bridges with the four controllable semiconductor valves 24 F / Sf / 44885
    Scp +, Scp-r Scn +, Scn_ provided wherein the positive and negative terminals of the two half-bridges are connected to the buffer capacitors Ccp, Ccn. The semiconductor valves Scp +, Scp-, Scn + / Scn- are provided on a third branch Z3. The execution of such an interconnection of controllable
    Semiconductor valves Scp +, Scp_, Scn +, Scn- is in particular with a known, available on the market and thus low to be realized so-called "3-level topology". of IGBTs with free-wheeling diodes possible, while also a center M is provided. The buffer capacitors CCp, Ccn are both part of the 3-level bridge branch of the first converter system 9, as well as the half-bridges of the second and third converter system 9,10. The pole terminals B and C of the three-pole circuit are provided between a first pair Scp +, Scp- and a second pair Scn + jScn- of controllable semiconductor valves, respectively. By suitable control of the controllable semiconductor valves Scp +, Scp_, Scn +, Scn_ of the two
    Half-bridges and the 3-level bridge branch, the currents can be controlled ijrr icpr icn.
    Furthermore, the preferred embodiment of the rectifier circuit according to the invention according to Figure 4 at the line side input 3 with the phases U, V, W connected, star-shaped filter capacitors CF on. The
    Filter capacitors CF are arranged in a star shape around a star point MCf. The star point MCF is further with a
    Leakage capacitor CBf with a midpoint M of the three-pole circuit 5 is connected. This connection of the network-side input 3 with a discharge capacitor CBf via the
    Filter capacitors CF, allows high-frequency fault currents if, caused by the high-frequency switching operations in the three-pole circuit 5, to flow off, which has particular advantages when all three currents ih3, icpf and iCn the three-pole circuit 5 are controlled with a specially designed controller. However, the terminal of the bypass capacitor CBf is not considered to be another, fourth pole terminal of the three-pole circuit 5 since the derived 25 F / Sf / 44885
    Fault currents if high frequency and comparatively small compared to the currents in the pole terminals A, B, C are.
    Each of the pole terminals A, B, C is according to a preferred embodiment in FIG. 4 connected to an inductance Lh3, Lcp, Lcn, which are used to carry the two control currents icp, icn and the injection current ih3. In this way, at least two of the three currents ih3 / iCp / icn are regulated, the third current resulting from the compulsory zero current sum.
    FIG. 4a shows the current profile of the phases U, V, W at the network-side input 3. The phase currents iu, iv, iw are phase-shifted in accordance with a three-phase system.
    FIG. 4b firstly shows the rectified voltage Urec which is present between the two output lines PdcuNdc after the rectification arrangement 1. The rectified voltage Urec has in addition to an output voltage Uo on sinusoidal crests. By filtering the rectified voltage Urec with the choke 7 and the output capacitor Co, a constant output voltage Uo is achieved.
    FIG. 4c shows the course of a positive rectifier current ip, which results from the suitable supply of a control current icp to the positive output line PDc of the bridge rectifier. The illustrated sinusoids correspond to the respective sections of the sinusoidal input currents iu, iv, iw.
    FIG. 4d shows the injection current ih3, which corresponds to the triangular portions of the network currents iu, iv, iw. With the rectifier circuit according to the invention, this injection current ih3 is supplied to the three-pole circuit 5.
    The inductor current iL is shown in FIG. 4f and has a constant output current i0 which is fed directly to the load 6 26 F / Sf / 44885 and a superimposed alternating component which results from the voltage difference of the rectifier output voltage Urec and the approximately constant output voltage u0. The course of the required control currents icp, icn is shown in FIGS. 4g and 4h. The control currents icp, icn are preferably to be regulated according to FIGS. 4g and 4h.
    According to a further embodiment, a second and third converter system 9, 10 of the three-pole circuit 5 may be provided. The first converter system 9 is connected by a direct connection to the pole terminal A via the midpoint M. The second and third converter system 10,11, as already described in Figure 4, advantageously by half-bridges with controllable semiconductor valves Scp +, Scp-, Scn +, Scn. and buffer capacitors. Due to the direct connection of the center point M with the pole terminal A of the three-pole circuit 5, the potential of the center M is defined and shows no high-frequency voltage jumps. In this case, the two control currents icp, icn are regulated by suitable control of the controllable semiconductor valves of the two half-bridges and, whereby the injection current ih3 results due to the zero current sum of the three-pole circuit 5. A connection of the three-pole circuit 5 by means of bypass capacitor CBf back to the network is not provided according to the embodiment of the rectifier circuit according to FIG.
    In Figure 5, an advantageous embodiment of the three inductors Lh3, Lcp, Lcn is indicated with a three-leg throttle, wherein the winding sense is entered with points on the individual chokes, which advantageously a substantial reduction in the volume and weight of the magnetic components and thus the entire rectifier system according to the invention has the consequence. 27 F / SfV44885
    Furthermore, FIG. 5 shows an embodiment of the bidirectional switch Sh3 of a unidirectional 3-level bridge branch of the first converter system 9 of a three-pole circuit 5, in which two mutually connected IGBTs with antiparallel freewheeling diodes are used, alternatively also other switch elements such as Example MOSFETs can be used. This embodiment of bidirectional switches Sh3 is known per se, but should be illustrated here in conjunction with the rectifier circuit according to the invention, in which the bidirectional switch Sh3 with the rectifier circuit according to the invention and the method according to the invention for impressing control currents, the regulation of a midpoint voltage Umn should be explained ,
    The midpoint voltage Ums, shown in FIG. 5 and FIG. 6, influences the generation of the differential voltages Ul3, Ulp, ULn via the inductances Lh3, Lcp, Lcn by the
    Control currents and / or the injection current to regulate. The first differential voltage UL3 results from the first inductance Lh3, etc. An injection voltage Uh3 results from the potential of the first pole terminal A with respect to the network, ie, with respect to the neutral point N.
    The following summarizes possibilities for controlling the injection of control currents according to the invention: -) All three currents ih3 / icp / icn are controlled simultaneously with three converter systems 9, 10, 11 to a desired profile. It is not possible to regulate the center point voltage Umn since all degrees of freedom of the rectifier circuit according to the invention are already used for the regulation. If any control errors occur
    Potential jumps of the midpoint voltage Ums in appearance that can be advantageously captured by a design with bypass capacitor Cbf. Only two of the three currents ih3, icp / icn are respectively controlled with the respective converter systems 9, 10, 11, whereby e.g. 28 F / Sf / 44885 the converter system 9 controls the injection current ih3 and the converter system 10 controls the control current icp. Due to the inherent fact that the current sum of the three-pole circuit is zero, the third converter system 11 is advantageously used to control the mean value of the midpoint voltage Umn. -) According to a further preferred embodiment, a minimization of the buffer capacitor voltages Ucp, Ucn is possible by the mean value of the midpoint voltage Umh is controlled equal to the injection voltage occurring at the first pole terminal A of the three-pole circuit 5. Again, only two of the three streams ih3, icp, icn are respectively controlled with the respective converter systems 9, 10, 11, whereby e.g. the converter system 11 regulates the injection current ih3 and the converter system 9 controls the control current icp, the third converter system 10 then being used to regulate the mean value of the midpoint voltage Umn. By way of example, in FIG. 6a, such a mean value of the center point voltage Umh regulated in comparison to the voltage at the first pole terminal A of the three-pole circuit 6 is plotted, wherein in FIG. 6a only those switching periods of the semiconductor valves Scp +, Scp-r scn +, Sen-, Sh3, Sh3 + r Sh3- averaged midpoint voltage, is shown. While the first converter system 9 can be implemented with a unidirectional 3-level bridge branch for the first two control methods, a bidirectional execution of the 3-level bridge branch of the first converter system 9 is absolutely necessary for the third control method.
    FIG. 6 shows a preferred embodiment of the three-pole circuit 5 with bidirectional 3-level bridge branch in the first converter system 9. In this case, the rectifier diodes 0 ^ 3 +, Dh3- on the first branch Ζχ, as shown in Figure 4, by active controllable semiconductor devices Sh3 +, Sh3-, e.g. as shown in Figure 6 by IGBTs with antiparallel freewheeling diodes replaced. This allows currents 29 F / Sf / 44885 also in phase opposition. to the injection voltage Uh3 at the first terminal A of the three-pole circuit 5 are impressed.
    FIG. 7 shows an embodiment of the rectifier circuit according to the invention, in which the first converter system 9 is replaced by a direct connection of the first pole terminal A to the center M of the three-pole circuit 5, and both the second converter system 10 and the third converter system 11 are replaced by a 3 Level bridge branch is executed, wherein in Figure 7, the known three-level neutral-point clamped converter 3L-NPC is executed, wpbei also generic bridge branches can be used. The two 3-level bridge arms are each arranged symmetrically about a midpoint Zm, the midpoint branch being connected to the DC terminals of the 3-level bridge branches. The center branch Zm is connected to buffer capacitors CCp > Ccn provided, and connected via the switching elements Si, S2, S3 directly to the center M of the center branch Zm connected to the network-side input 3 switchable. A neutral terminal Ns of the 3-level bridge branches is connected to the center M and the first pole terminal A. An AC terminal ACs of the 3L NPC is connected to the pole terminals B, C via the inductors LCp, Lct, respectively. In this embodiment, the control currents icp, icn are regulated by suitable control of the semiconductor valves Scp +, Scp-, Scn +, transmitter 3-level bridge branches, whereby the injection current ih3 results automatically. Since the midpoint M is connected directly to the mains phases U, V, W via the switches S1, S2, S3, control of the mean voltage Umn-Da of the control currents icn, icp is unnecessary both positive and negative sign at always positive or negative voltage level at the midpoint M, bidirectional bridge structures must be used in the two converter systems 10,11.
    FIG. 8 shows a further embodiment of the three-pole circuit 5, whereby a voltage source Ux is additionally provided at the current branch of the injection current ih3. The 30 F / Sf / 44885
    Control currents icp, icn are regulated by suitable control of the controllable semiconductor valves Scp +, SCp-f Scn + / Scn- of the converter systems 10, 11, whereby the injection current ih3 results automatically. According to the invention, the voltage source Ux impresses in the branch between the pole terminal A and the midpoint M of the three-pole circuit a time-varying voltage which results in an increase or reduction of the center point voltage Umn and enables a distortion-free guiding of the control currents icp, icn.
    FIG. 9 shows a further embodiment of a three-pole circuit 5 with voltage source Ux, which is provided between the second and third converter system 10, 11 of the three-pole circuit, wherein the voltage source Ux according to FIG. 9 is a DC voltage source. Two injection capacitors Ch3P, Ch3n, whose connection is connected to the pole terminal A of the three-pole circuit 5, are provided in parallel with the voltage source. The control currents iCp / icn are controlled by suitable control of the controllable semiconductor valves Scp +, Scp-, Scn +, Scn-controlled, whereby the injection current ih3 automatically results due to the zero current sum. The additionally inserted voltage source Ux advantageously lowers the negative potential of the second converter system 10 or advantageously raises the potential of the positive connection of the third converter system 11, which subsequently allows a largely distortion-free routing of the two control currents icn, icp.
    It is therefore immediately apparent that a rectifier circuit with current injection and a method for impressing control currents has been improved in such a way that small network perturbations of the rectifier circuit occur, whereby a possible sinusoidal input current in phase with the respective mains voltages should be present, not large magnetic components at the AC side of the 31 F / Sf / 44885
    Rectifier circuit are needed, pulse-shaped injection of the control current to the output of the rectifier circuit is avoided, no large AC or DC side arranged filter capacitors are needed, and the efficiency of the rectifier circuit is improved.
    权利要求:
    Claims (25)
    [1]
    F / Sf / 448e5 Claims: 1. Rectifier circuit comprising a three-phase rectification arrangement (1) of semiconductor valves (2), preferably a bridge rectifier circuit of diodes, the rectification arrangement (1) comprising a three-phase network-side input (3) and a DC-side output (4) and at least one of three phases (U, V, W) at the network input (3) is connected to a first pole terminal (A) of a three-pole circuit (5) for deriving an injection current (ih3) into the three-pole circuit (5) , characterized in that each phase (U, V, W) in each case with a switching element (Si, S2, S3) to the first pole terminal (A) of the three-pole circuit (5) is connectable, and a second and third pole terminal (B, C ) of the three-pole circuit (5) is in each case connected to an output line (Pdc / Ndc) of the DC-side output (4) for control currents (iCp / icn), the three-pole circuit (5) controlling controllable semiconductor valves (Scp +, Scp_, Scn + r Scn-), preferably IGBTs, for actively controlling the control currents (icp, icri} and / or the injection current (ih3), and at least one throttle (7) on one of the output lines (PdccNjx) on the DC side Output (4) is arranged, and a time-varying load (6) on the DC side output (4) is provided.
    [2]
    2. rectifier circuit according to claim 1, characterized in that the second and third pole terminal (B, C) of the three-pole circuit (5) via a respective second and third inductance (Lcp, LCn} with one of the two output lines (PdoNdc) of the DC side output (4) is connected, and between the second or third pole terminal (B, C) and the load (6), the throttle (7) is provided.
    [3]
    3. rectifier circuit according to claim 2, characterized in that via a first inductance (Lh3) of the 4 * 4 m 4 4 · 4 * 4 m 4 4 · 35 F / Sf / 44885 first pole terminal (A) with the switching elements (Sl, S2, S3), the three inductors (Lh3, Lcp / Lcn) being implemented by means of a 3-arm throttle.
    [4]
    4. rectifier circuit according to one of claims 1 to 3, characterized in that the two output lines (PDCrNDC) are connected to the DC-side output (4) with an output capacitor (C0).
    [5]
    5. rectifier circuit according to one of claims 1 to 4, characterized in that each of the three phases (U, V, W) at the network input (3) each having a filter capacitor (CF) is connected, wherein the filter capacitors (CF) star-shaped in a star point (Mqf) are interconnected.
    [6]
    6. rectifier circuit according to one of claims 1 to 5, characterized in that the three-pole circuit (5) via at least one bypass capacitor (CBF) to the network-side input (3) is connected.
    [7]
    7. rectifier circuit according to one of claims 1 to 6, characterized in that the three-pole circuit three converter systems (9,10,11) with controllable semiconductor valves (Scp +, Scp_, Scn +, Scn_) and / or a bidirectional switch (Sh3), preferably arranged in a bridge structure, comprising, where. a first converter system (9), the first pole terminal (A) of the three-pole circuit (5), the second pole terminal (B) of the three-pole circuit (5) on a second converter system (10), and the third pole terminal on a third converter system (11) (C) of the three-pole circuit (5) is provided, and of all three converter systems (9,10,11) a connection to a branch point, a common center (M) of the three-pole circuit (5) is provided. 4 «* · · * · · · · · · · ·« * «*« * * * «« ··· «« t • · ♦ · «· # · t · t 26 F / Sf / 44865
    [8]
    8. rectifier circuit according to claim 7, characterized in that the first converter system (9) is provided as a 3-level bridge branch, wherein the second and third converter system (10,11) are provided as a half-bridge, and the three converter systems (9,10, 11) are carried out by means of three parallel-connected branches (Zi, Z2, Z3) which are occupied by electronic components, wherein the first pole terminal (A) of the three-pole circuit (5) is implemented on a first branch (Zi), and on a third branch Branch (Z3) of the second and third pole terminal (B, C) are carried out, and each of the branches (Zi, Z2, Z3) has a mid-point terminal (Mi, M2, M3) to which center terminals (Mi, M2, M3) Components of the branches (Zi, Z2, Z3) are arranged symmetrically, wherein a first midpoint terminal (Mi) of the first branch (Zj) via a bidirectional switch (Sh3) with a second midpoint terminal (M2) of the second branch (Z2) is connected and the second centerpunk t terminal (M2) is conductively connected directly to a third center terminal (M3) of the third branch (Z 3), wherein the third center terminal (M3) as the center (M) of the three-pole circuit (5) is provided.
    [9]
    9. rectifier circuit according to one of claims 1 to 6, characterized in that the three-pole circuit comprises two converter systems (10,11) with controllable semiconductor valves (Scp +, Scp_, Scn +, Scn *), preferably arranged in a bridge structure, wherein at one second converter system (10) the second pole terminal (B) of the three-pole circuit (5), as well as on a third converter system (11) the third pole terminal (C) of the three-pole circuit (5) is provided, and of both converter systems (10,11) a connection to a branch point, a common center (M) of the three-pole circuit (5) is provided, and the center point (M) is connected to the first pole terminal (A). 37 F / Sf / 44885
    [10]
    10. rectifier circuit according to claim 9, characterized in that the second and third converter system (10,11) are provided as a half-bridge, wherein the two converter systems (10,11) by means of two parallel-connected branches (Z2, Z3) are executed, and with a second branch (Z2), the first pole terminal (A) of the three-pole circuit (5) is connected, and on a third branch (Z3) of the second and third pole terminal (A, B) are executed, and each of the branches (Z2, Z3 ) has a mid-point connection (M2, M3) around which midpoint connections (M2, M3) the components of the branches (Z2, Z3) are arranged symmetrically, and a second mid-point connection (M2) of the second branch (Z2) directly to a third midpoint connection ( M3) of the third branch (Z3) is conductively connected, wherein the third center terminal (M3) as the center (M) of the three-pole circuit (5) is provided.
    [11]
    11. rectifier circuit according to claim 10, characterized in that the second center terminal (M2) via a voltage source (Ux) to the first pole terminal (A) is connected.
    [12]
    12. rectifier circuit according to claim 8, characterized in that in the first branch (Z3) two bridge valves (Dh3 +, Dh3-), preferably diodes, are connected in series with the same passage direction, wherein the first center port (Mi) between the two bridge valves (Dh3 + , Dh3-} is arranged.
    [13]
    13. Rectifier circuit according to claim 8 or 10, characterized in that on the second branch (Z2) two buffer capacitors (CCp, CCn) are connected in series, wherein the second center terminal (M2) between the two buffer capacitors (Ccp, Ccm) is arranged. 38 F / St / 44885
    [14]
    14. rectifier circuit according to one of claims 8 or 10, characterized in that the third branch (Z3), the four controllable semiconductor valves (Scp +, Scp, Scn +, Scn_) are provided connected in series, wherein the midpoint (M) of the three-pole circuit (5) is arranged in the connection between two serially connected pairs of the controllable semiconductor valves (Scp +, Scp-, Scn +, Scn_), and the second pole connection (B) between the controllable semiconductor valves (3 ^ +, 3 ^ -) of the first pair is provided, and the third pole terminal (C) between the controllable semiconductor valves (Scn + rScn-) of the second pair is provided.
    [15]
    15. Rectifier circuit according to claim 12, characterized in that the two bridge valves (Dh3 +, Dh3-) are designed as controllable semiconductor valves (Sh3 + / Sh3-), preferably IGBTs.
    [16]
    16. rectifier circuit according to claim 9, characterized in that the second and third converter system (10,11) of the three-pole circuit (5) are designed with known bidirectional 3-level bridge branches, preferably two so-called three-level neutral-point clamped Converter (3L-NPC), wherein the 3-level bridge branches are arranged symmetrically about a center branch (Zm) connected in parallel to the 3-level bridge branches, and the center branch (Zm) as two series-connected buffer capacitors (0Cp, CCk} and the midpoint (M) is provided between the two buffer capacitors (CCp, CCn), and a neutral terminal (Ne) of the 3-level bridge branch is connected to the midpoint (M) and the first pole terminal (A), and an AC terminal (ACS) of the 3-level bridge branch are respectively provided as the second pole terminal (B) and the third pole terminal (C) of the three-pole circuit (5) 39 F / Sf / 44835
    [17]
    17. Rectifying circuit according to claim 9, characterized in that the three-pole circuit (5) is connected to the first pole terminal (A) in each case to one side of two injection capacitors (Ch3P, Ch3n), which connection connects the midpoint (M) of the three-pole circuit ( 5), wherein the two other sides of the injection capacitors (Ch3P, Ch3n) are connected via a voltage source (Ux) and form connection points {MP, MN), starting from the connection points {ΜΡ, ΜΗ) starting from a current loop, each with a buffer capacitor (CCp, CCn) and in each case a pair of controllable semiconductor valves (SCp +, scp-, Scn +, Sen-) is provided, and between the two controllable semiconductor valves {Scp +, Scp_, Scn +, Scn_) of a pair of the second pole terminal (B) and the third pole terminal (C) is provided.
    [18]
    18. A method for impressing control currents (icp, id) into a DC side output (4) of a rectifier circuit comprising a three-phase rectification arrangement (1) of semiconductor valves (2), preferably a three-pole bridge rectifier circuit of diodes, wherein an injection current (ib3> of at least one of the three phases (U, V, W) is branched off at a network-side input (3) of the rectifier circuit, characterized in that the injection current (ih3) is supplied to a first pole terminal (A) of a three-pole circuit (5), and the regulation of Injection current (i ^) and / or the control currents (iCn, icP) using active components, preferably controllable semiconductor valves (Scp +, Scp_, Scn +, Sen-), in the three-pole circuit (5), and the rectifier currents (ip, in ) on two DC-side output lines (Pdc, NDc), the control currents (ien / iep) via a second and third pole terminal (B, C) of the three-pole circuit (5) are added, and at least by a arranged on the DC side output (4) throttle (7) are guided. 40 F / Sf / 44885
    [19]
    19. A method for impressing control currents (iep / icn) according to claim 18, characterized in that the injection current (ih3) and / or the control currents (iCp / icn) by at least two of three inductors (Lh3, Lcp, Lcn), provided at least two of the three pole terminals (A, B, C) for smoothing and controlling the currents (ih3, icp, icn) are conducted across the inductances (Lh3, Lcp, Lcn) by differential voltages {UL3, ULn, ϋχ, ρ) , and by controlling two of the three currents (ih3, iCnr icp) the third current (ih3, icn ^ icp) is set.
    [20]
    20. A method for impressing control currents (icp, icn) according to one of claims 18 to 19 with a rectifier circuit according to one of claims 7, 8 or 12 to 17, characterized in that: a midpoint voltage (Umk) between the midpoint (M) the three-pole circuit (5) and a neutral point (N) is measured and an average value of the midpoint voltage (Umk) is controlled with one of the converter systems (9,10,11).
    [21]
    21. A method for impressing control currents (icp, icn) according to claim 20, characterized in that the mean value of the midpoint voltage (tW) is regulated to zero.
    [22]
    22. A method for impressing control currents (icp, iCT) according to claims 20 or 21 with a rectifier circuit according to one of claims 13 to 17, characterized in that a first buffer capacitor voltage (UCp) is regulated at the buffer capacitor (Ccp) greater than a voltage of positive output line (Pdc) against a neutral point (N), and a second buffer capacitor voltage (UCn) on the buffer capacitor (CCh) is controlled smaller than a voltage of the negative output line (NDc) against the neutral point (N).
    [23]
    23. A method for impressing control currents (icp, icn) according to one of claims 20 to 22, characterized in that 41 F / Sf / 44885 the control of the mean value of the midpoint voltage (1½) by means of the controllable semiconductor valves (Scp +, Scp-, Scn + , Scn, Sh3 + / Sh3-).
    [24]
    25. A method for impressing control currents (icp, icn) according to claim 19 to 24 with a rectifier circuit according to claim 15, characterized in that a first buffer capacitor voltage (üCp) is minimized at the buffer capacitor (Ccp), and a second buffer capacitor voltage (Uch) am Buffer capacitor (Cos) is minimized, wherein the midpoint voltage (1½) is regulated to the negative half value of an injection voltage (1½), and the injection voltage (Uh3) between the first pole terminal (A) and the neutral point (N) is applied.
    [25]
    26. A method for impressing control currents (icp / icn) according to one of claims 19 to 25 with a rectifier circuit according to claim 11 or 17, characterized in that by means of the regulation of the voltage source (Ux) the potential of the midpoint voltage (1½) with respect to one of both output lines (PdoNdc) is increased or decreased.
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    同族专利:
    公开号 | 公开日
    ES2881689T3|2021-11-30|
    WO2013143793A3|2014-04-03|
    CN104221263A|2014-12-17|
    CN104221263B|2017-07-28|
    US20150029771A1|2015-01-29|
    AT512752B1|2018-02-15|
    EP2831989B1|2021-05-05|
    JP2015511809A|2015-04-20|
    WO2013143793A2|2013-10-03|
    US9444362B2|2016-09-13|
    EP2831989A2|2015-02-04|
    JP6204970B2|2017-09-27|
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    法律状态:
    2021-11-15| MM01| Lapse because of not paying annual fees|Effective date: 20210330 |
    优先权:
    申请号 | 申请日 | 专利标题
    ATA387/2012A|AT512752B1|2012-03-30|2012-03-30|Rectifier circuit with current injection|ATA387/2012A| AT512752B1|2012-03-30|2012-03-30|Rectifier circuit with current injection|
    US14/382,726| US9444362B2|2012-03-30|2013-02-22|Rectifier circuit with current injection|
    ES13707141T| ES2881689T3|2012-03-30|2013-02-22|Rectifier circuit with current injection|
    PCT/EP2013/053532| WO2013143793A2|2012-03-30|2013-02-22|Rectifier circuit with current injection|
    CN201380017808.4A| CN104221263B|2012-03-30|2013-02-22|The rectifier circuit injected with electric current|
    EP13707141.1A| EP2831989B1|2012-03-30|2013-02-22|Rectifier circuit with current injection|
    JP2015502170A| JP6204970B2|2012-03-30|2013-02-22|Rectifier circuit with current injection|
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