• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
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    • 专利摘要:
    apparatus for limiting the line current or breaking the current and respective control method. it is an apparatus for limiting a current of a line or breaking a current and a respective control method are disclosed. the apparatus includes a current breaking branch (29) and a bridge branch. the bridge branch includes two bridge arms formed by four identical current switching branches (a, b, c and d). each two of the four current switching branches are connected in series and the two formed bridge arms are then connected in parallel. the two bridge arms are connected parallel to the chain breaking branch (29) and the midpoints of the two bridge arms are connected separately to two ends of a line. each current switching branch includes at least one high speed switch (6) and bidirectional semiconductor power switches (10) which are connected in series. the device can turn off currents in two directions.
    公开号:BR112015018164B1
    申请号:R112015018164-3
    申请日:2013-12-27
    公开日:2021-07-13
    发明作者:Wang Yu；Cao Dongming；Fang Taixun；Yang Hao；Yang BING；Shi Wei；Lu Wei
    申请人:Nr Eletric Co., Ltd；Nr Engineering Co., Ltd；
    IPC主号:
    专利说明:

    FIELD OF THE INVENTION
    [001] The present invention relates to an apparatus for limiting a current of a line or breaking a current of a line and a method for controlling the apparatus. HISTORY OF THE INVENTION
    [002] A high voltage direct current (DC / direct current) circuit breaker is one of the crucial devices in multi-ended DC power transmission systems. A multi-ended high voltage DC transmission system has a high voltage level and a small line impedance, and once a short circuit fault occurs in the line, a DC power transmission network and a current network alternating current (AC / alternating current) will be affected momentarily, so the fault should be resolved quickly. In this case, a high voltage DC circuit breaker needs to act as quickly as possible to shorten the fault duration or suppress the fault current to a large extent in order to reduce the impacts of the AC/DC power transmission network failure. Since the high voltage DC circuit breaker is wired in series on the power transmission line, the direction of power flow in the power transmission line is uncertain, and current can flow in either direction. Therefore, it is necessary for the circuit breaker to have the ability to break DC currents in two directions.
    [003] Chinese Patent Application No. CN102780200A uses a conventional high voltage DC circuit breaker to break a DC from current, where the structure of the conventional DC high voltage circuit breaker is formed by three parts: one AC circuit breaker, one cycle LC oscillation and a power consumption element. After the AC breaker is open, an arc is generated. Arc voltage oscillates with the LC oscillation cycle. When the peak value of the current swing reaches the amplitude of DC, DC can be canceled completely so that a zero crossing point appears at the breaker gate, which causes the arc to extinguish, thus reaching a goal of disconnecting DC from current. Such a breaking method does not include a semiconductor feed device, is non-directional, and therefore can break currents in two directions and have a small loss during normal operation. However, the conventional high voltage DC circuit breaker requires a long arc extinction time of about a few tens of milliseconds, and cannot meet the requirement for fast fault isolation in multi-ended DC power transmission system.
    [004] To quickly isolate DC fault current and maintain high power transmission efficiency, Chinese Patent Application No. CN10268721A discloses an apparatus and method that creates a short circuit in a current in a power distribution line. power and a power transmission line, and a current limiting apparatus, where the apparatus includes a main circuit breaker, a high speed switch, an auxiliary circuit breaker and a non-linear resistance power consumption element. In a normal operating mode, line current flows through an auxiliary loop, with little loss of conduction; in a failure mode, current is switched to the primary circuit breaker and is finally absorbed by the power consuming element, thereby breaking the current.
    [005] After the high voltage DC circuit breaker apparatus turns off the fault current, the main circuit breaker supports a voltage of a few hundred kilovolts. The number of semiconductor power devices connected in series in one direction of current is up to a few hundred. The semiconductor feeding device can be driven in only one direction; Therefore, to disconnect the fault current in both directions of the current, the base series unit of the main circuit breaker in the high voltage DC circuit breaker apparatus adopts two anti-series or anti-parallel structures of semiconductor power supply devices, and the number of semiconductor power devices in the primary circuit breaker is doubled. When the current is broken in a first current direction, semiconductor power devices, in a second current direction, have no beneficial effect in breaking the current or withstanding the voltage, ie the utilization rate of semiconductor devices. main circuit breaker power is only 50%. As the costs of powering semiconductor devices account for a large proportion of the total apparatus costs, providing the function of breaking currents in two directions will significantly increase apparatus costs. The arrangement of semiconductor supply devices in the second direction of current in the primary circuit breaker has no beneficial effect, and the overvoltage and overcurrent generated when the current is turned off in the first direction of the current have adverse effects on the semiconductor devices feed in the second direction of current. If the semiconductor supply devices in the second direction of the current and the semiconductor devices supplying the first direction of the current are connected in an anti-parallel way, an excess voltage generated when the current is turned off, in the first direction of the current, will be applied to the semiconductor devices supply in the second direction of current, and the voltage is a reverse voltage for semiconductor devices supply in the second direction of current, which will cause damage to the devices; if the semiconductor supply devices with antiparallel diodes in the second current direction and the semiconductor supply devices with antiparallel diodes in the first current direction are connected in an anti-series way, an abruptly increased current, generated when the current is turned off in the first direction of current, will flow freely through the diodes in semiconductor power devices in the second direction of current, reducing the life of the devices.
    [006] The arrangement of the semiconductor supply devices, in the second current direction, also has an adverse effect on the structural design and electrical design of the main circuit breaker. The directions of the arrangement of semiconductor power devices, in the first direction of current, are consistent, making the electrical design and the structural design consistent. The arrangement of semiconductor power devices in the second current direction destroys the original consistency in the arrangement direction, increasing the difficulty in device layout, installation and wiring.
    [007] In the branch of auxiliary circuit breakers of Chinese Patent Application no. CN102687221A, the very high speed mechanical switch is wired parallel to the main circuit breaker, the very high speed mechanical switch cannot completely isolate the apparatus to protect the main circuit breaker and the primary circuit breaker has no obvious breakpoints, being difficult to repair and to maintain. SUMMARY OF THE INVENTION
    [008] An objective of the present invention is to provide an apparatus for limiting a current of a line or breaking a current, and a respective control method, which is suitable for line currents in two directions and can greatly reduce the Appliance costs and reduce difficulty in device layout, installation and wiring of the appliance on premise to ensure high speed breakdown and low loss.
    [009] To achieve the aforementioned objective, the present invention adopts the following solution:
    [010] An apparatus for limiting a current of a line or breaking a chain, including: a breaking branch of the chain, the breaking branch of the chain including a breaking unit, or at least two breaking units, which are connected in series, each breaking unit including a solid state direct current (DC) circuit breaker and a non-linear resistor connected in parallel; and further including a bridge branch, the bridge branch comprising two bridge arms, formed by four identical current switching branches, referring to two of the four current switching branches being connected in series, the two bridge arms formed are then connected in parallel, the two arm branches being connected parallel to the current breaking branch, and midpoints of the two bridge arms being separately connected to two ends of a line; each current switching branch comprises at least one high speed isolation switch and at least one bidirectional semiconductor power switch which are connected in series; and a direction in which a current enters from the midpoint of a first bridge arm and then flows through a first current switching branch in the first bridge arm, the current breaking branch, and a fourth branch. switching current on a second bridge arm is defined as a first current direction, a direction in which a current enters from the midpoint of the second bridge arm and then flows through a third current switching branch. in the second bridge arm, the current breaking branch, and a second current switching branch in the first bridge arm is defined as a second current direction, and a solid state DC breaker organization direction is the same than the first and second current directions.
    [011] The bidirectional semiconductor power switch is formed by two semiconductor power devices, connected perpendicularly, in which a second semiconductor power device has on and off capabilities; and a first semiconductor supply device in the first current switching branch, the second semiconductor supply device in the second semiconductor current switching branch, the second semiconductor supply device in the third current switching branch, and a first semiconductor supply device in the fourth current switching branch are in the same direction as the first current direction and the second semiconductor supply device in the first current switching branch, a first semiconductor supply device in the second current switching branch, a first semiconductor device supply device in the third current switching branch and the second semiconductor supply device in the fourth current switching branch are in the same direction as the second current direction.
    [012] Each current switching branch further includes at least one second bidirectional semiconductor power switch, in which the second bidirectional semiconductor power switch has the same structure as the bidirectional semiconductor power switch connected in parallel with the power switch bidirectional semiconductor.
    [013] The first semiconductor power supply device does not have on and off capability.
    [014] The solid state DC circuit breaker consists of at least one semiconductor power device connected in series.
    [015] A method of controlling the above apparatus and breaking a current, the apparatus being connected in series with a one-line current path, where the solid state DC circuit breaker in the current breaking branch is closed and on that the high-speed isolation switch and the bidirectional semiconductor power switch in the current switching branch are closed, the control method including the following steps:- if an instruction signal to turn off a line current is received, determine the line current direction; and if the direction of the line current is the first direction of current, perform the following operations in sequence:- turn off the secondary power semiconductor devices from the bidirectional semiconductor power switches on the second and third current switching branches at the same time, in order to switch the current to the current breaking branch;- then turn off the high speed isolation switch on the second and third current switching branches at the same time;- then turn off the solid state DC breaker in the current-breaking branch, at the same time, in order to switch the current to a non-linear resistance in the current-breaking branch; and turn off the high-speed isolating switches on the first and fourth current switching branches, thus completing the entire breaking process; or- if the direction of the line current is the second direction of current, perform the following operations in sequence:- turn off the semiconductor secondary power devices from the bidirectional semiconductor power switches on the first and fourth current switching branch at the same time , in order to switch the current to the current breaking branch; then, turn off the high speed isolation switch on the first and fourth current switching branches at the same time;- then turn off the solid state DC breaker in the current-breaking branch, at the same time, in order to switch the current to a non-linear resistance in the current-breaking branch; and turn off the high speed isolating switches on the second and third current switching branches, thus completing the entire breakout process.
    [016] A method of controlling the above apparatus to limit a current, the apparatus being connected in series with a one-line current path, in which the solid state DC circuit breaker in the current breaking branch is closed and the switch speed isolation switch and the bidirectional semiconductor power switch in the current switching branch are closed, the method including the following steps:- if an instruction signal to limit the line current is received, determine the direction of the current from the line; and if the line current direction is the first current direction, perform the following operations, in sequence: - turn off the secondary power semiconductor devices of the bidirectional semiconductor power switch in the second and third current switching branches at the same time , in order to switch the current to the current breaking branch;- then, turn off the high speed isolation switches on the second and third current switching branches at the same time; and then, turn off at least one solid-state DC circuit breaker in the current breaking branch at the same time so as to switch the current to the non-linear resistance, at least in one current breaking branch; or if the direction of the line current is the second direction of the current, perform the following operations, in sequence: - turn off the semiconductor secondary power supply devices from the bidirectional semiconductor switches in the first and fourth current switching branches, at the same time, from in order to switch the current to the current breaking branch;- then, turn off the high speed isolation switches on the first and fourth current switching branches at the same time; and then turn off at least one solid-state DC circuit breaker in the current-break branch, in order to switch the current to at least one non-linear resistance in the current-break branch, thus limiting the current in the line.
    [017] Through the above solution, the present invention is advantageous in the following aspects: (i) Low conduction loss: when the line works normally, the current switching branch can ignore the current break branch and the line current flows through the switching branches of current formed by high-speed isolation switches with near zero impedance and a small number of semiconductor power devices with a low conduction voltage drop. Since the current-breaking branch requires a greater conduction voltage drop, almost no current flows through the current-breaking branch, and therefore the total loss of the apparatus is quite low.(ii) Compared to the circuit breaker of conventional high voltage DC, the breaking speed is increased. The semiconductor power device which is used as a unit to implement the current break has a high speed. Generally, the breaking speed of the power semiconductor device is only a few tens of milliseconds and can be ignored. The total breakage time of the apparatus is mainly determined by the breakage time of the high speed isolation switch. Currently, the break time of the high speed isolation switch can reach 1-3 ms. Therefore, it can be predicted that the total breakage time of the apparatus is about 3-5 ms, which is much faster than the breakage speed of the conventional high voltage DC circuit breaker.(iii) The breaking of currents in two directions is achieved at low costs. The current breaking branch in the present invention is formed by power switching devices connected in series in the same current direction, and the current switching branch causes the line currents, which are in two directions, to flow through the branch. of current breaking in the same direction. When the line current is in the direction of the first current, the semiconductor supply devices on the switching branches of current A, D are in the same direction as the first direction of current, the semiconductor supply devices on the switching branches of current B, C are off, so that the semiconductor power devices, in the switching branches of current AD, are in a reverse direction of the first direction of current, and are in a reverse cut-off state, and the direction of current flowing through the breaking branch of the current is from a knot to a knot. When the line current is in the second direction of current, the switching branches of current B, C are in the same direction as the second direction of current and the semiconductor power devices, in the switching branches of current A, D, are off , so that the semiconductor power devices, in the switching branches of current A, D, are in the reverse direction to the second current direction and in a reverse cut-off state, and the direction of the current flowing through the breaking branch of the current is from the node to the node. It can be seen that when the line currents have different directions, the currents flow through the current breaking branches in the same direction. The current switching branch includes a small number of semiconductor power devices and four groups of high speed isolation switches. Since the number of semiconductor power devices is small, costs are low. High speed isolating switches are open when there is no current, there is no need to extinguish the arc, and only the voltage isolating function is provided, so costs are low. Therefore, compared to Chinese Patent Application No. CN102687221A, the total costs are greatly reduced, and the efficiency of using semiconductor feeding devices in the apparatus is improved; Furthermore, the defect of Chinese Patent Application No. CN102687221A in implementing the bidirectional function is avoided. (iv) Good isolation and maintenance function: The high speed isolation switches in the current switching branches in the present invention are open after the current is broken, so that all semiconductor power devices in the apparatus are completely isolated, which is safe and reliable, as well as facilitating maintenance and repair, and no additional isolation knife switches need to be configured on the apparatus so that costs are saved. BRIEF DESCRIPTION OF THE DRAWING Figure. 1 is a schematic view illustrating the connection of an apparatus in accordance with the present invention; Figure. 2 illustrates a correspondence between the first direction of current and the direction of the semiconductor supply device; Figure. 3 illustrates a correspondence between the second direction of current and the direction of the semiconductor supply device; and The Figure. 4 illustrates a branch of current switching in a normal mode. DETAILED DESCRIPTION OF THE INVENTION
    [018] As shown in Fig. 1, an apparatus (20) for limiting a current from a line (44) or breaking a chain, according to the present invention, includes a current breaking branch (29) and a bridge branch, which will be described below respectively.
    [019] The breaking branch (29) includes at least one breaking unit connected in series and two ends of the breaking branch (29) being a knot (1) and a knot (2), respectively . Each breaking unit includes a solid state DC circuit breaker (9) and a non-linear resistor (13) connected in parallel, the solid state DC circuit breaker (9) is formed by at least one semiconductor supply device (5 ) connected in series and a solid state DC breaker arrangement direction (9) being the same as a current direction from node (1) to node (2).
    [020] The bridge branch comprises two bridge arms formed by four identical current switching branches (A, B, C and D), in which a specific connection ratio is: the current switching branches (A and B ) are connected in series to form a first bridge arm, the midpoint (3) of the bridge arm being connected to one end of the line (44); the current switching branches (C and D) being connected in series to form a second bridge arm, the midpoint (4) of the bridge arm being connected to the other end of the line (44); the two bridge arms being connected in parallel and the two bridge arms being both connected in parallel to the chain breaking branch (29).
    [021] Each current switching branch includes at least one high-speed isolation switch (6) and at least one bidirectional semiconductor power switch (10) that is connected in series. The bidirectional semiconductor power switches (10) in the switching branches of current A and D each include a semiconductor power device (7) in a first current direction (14) and a semiconductor power device (8) in a second current direction (15) which are connected in parallel, a correspondence between the current direction and the direction of the supply semiconductor device is shown in Fig. 2, and the supply semiconductor device (8) has on and off capabilities. The bidirectional semiconductor power switches (10) in the current switching branches (B and C) each include a semiconductor power device (7) in the second direction of current (15) and a semiconductor power device (8) in the first current direction (14), which are connected in parallel, a correspondence between the current direction and the direction of the supply semiconductor device is shown in Fig. 3, and the supply semiconductor device (8) has alloying capabilities and hangs up.
    [022] In practice, the current switching branches (A, B, C and D) may further each include at least one bidirectional semiconductor power switch (10), which is connected in parallel with the power switches bidirectional semiconductors (10) in the current switching branches (A, B, C and D) above. By configuring this structure with several branches connected in parallel, the actual support capacity of the apparatus (20) can be increased.
    [023] Each current switching branch has a lower resistance than the current breaking branch (29). The term "resistance" refers to a resistance to a current flowing through a semiconductor driven power device. In other words, the current switching branch has a lower conduction voltage drop than the current breaking branch (29).
    [024] In the apparatus (20), the current breaking branch (29) has a higher voltage blocking capacity than the current switching branch, and the current breaking branch (29) is capable of breaking a unidirectional line current. Since a high break voltage is generated between the two ends of the current break branch (29), that is, between node (1) and node (2) after the current is broken, for example, a high voltage of hundreds of thousands of volts can be generated in a high voltage DC power transmission system, the current breaking branch (29) includes many semiconductor power supply devices (5) connected in series, which function at the same time. time to evenly withstand the breaking strain. Therefore, the current breaking branch (29) has a higher voltage blocking capacity than the current switching branch.
    [025] In the present invention, each of the current switching branches (A, B, C and D) has two modes of operation, including a normal mode and a break mode. In normal mode, that is, during normal system operation, a normal line current flows through the apparatus (20); In this case, the semiconductor supply devices (8) of the current switching branches (A, B, C and D) can be controlled to enter an on state, and normal line current flows through the current switching branches. (A, B, C and D). As shown in Fig. 4, a normal line current flows through the current switching branches (A and C) and the current switching branches (B and D), and through the current switching branches (A and D). , B, C and D) have a lower conduction voltage drop than the current-breaking branch (29), the current-breaking branch (29) is bypassed, and almost no current passes through the current-breaking branch ( 29), the current switching branch (A and C) and the current switching branches (B and D) uniformly support the line current, and currents in two directions can flow. When the line current is in the first current direction (14), part of the current flows through the semiconductor supply device (7) of the current switching branch (A) and the semiconductor supply device (8) of the switching branch the current (C) and the other part of the current flows through the semiconductor supply device (8) of the current switching branch (B) and the semiconductor supply device (7) of the current switching branch (D); When the line current is in the second direction of the current (15), part of the current flows through the supply semiconductor device (8) of the current switching branch (A) and the supply semiconductor device (7) of the switching branch of the current (C) and the other part of the current flows through the semiconductor supply device (7) of the current switching branch (B) and the semiconductor supply device (8) of the current switching branch (D). Since the actual switching branch can be implemented using a small number of devices and have a small resistance when switched on, the apparatus (20) connected to the line (44) generates a small additional loss.
    [026] In break mode, the semiconductor supply devices (8) in the current switching branches (A, B, C and D) can be selectively deactivated according to the direction of the line current (44). After the semiconductor power device (8) is turned off, the bidirectional semiconductor power switch (10) becomes a semiconductor power device that only has a unidirectional conduction capability. Through the unidirectional conduction property of the supply semiconductor device, the two-way line currents flow through the current breaking branch (29) in the same direction. In this way, the supply semiconductor devices (5) in the current breaking branch (29) can have only one arrangement direction, and the number of supply semiconductor devices is halved. The main function of the high speed isolation switches (6) is to isolate the voltage. A high break voltage is generated between node (1) and node (2) after the current break branch (29) breaks the current, the voltage is applied to the current switching branches, the high speed isolation switches (6) can withstand a high breakout voltage, and the semiconductor supply devices in the current switching branches need only withstand a small breakout voltage.
    [027] To summarize, during normal operation, the current switching branches can bypass the current breaking branch (29), in order to reduce the loss of operation of the apparatus (20); When the current needs to be turned off, the current switching branches provide a current switching function to transfer a current that is in one direction to the current breaking branch (29); switching can be implemented simply by controlling the semiconductor power devices (8) when turned on and off, and does not require additional hardware costs.
    [028] The present invention also provides a method for controlling the apparatus (20) to break a current, the apparatus (20) being connected in series with a one-line current path (44) qualified by the DC state breaker solid (9), in the current breaking branch (29), be closed and the high-speed isolation switches (6) and bidirectional semiconductor power switches (10) in the current switching branches (A, B, C and D) are closed, the control method including the following steps:- if an instruction signal to turn off a line current (44) is received, determine the direction of the line current (44); and if the direction of the line current is the first direction of the current (14), perform the following operations in sequence:- turn off the secondary power semiconductor devices (8) from the bidirectional semiconductor power switch (10) in the switching branches of the current (B and C), at the same time, in order to switch the current to the current breaking branch (29); then, turn off the high speed isolation switch (6) at the current switching branches (B and C) at the same time, indicated by when the line current direction is the first current direction (14), as shown in Fig. 2, the current switching branch (B and C) withstands a high break voltage, generated when the current break branch (29) breaks the current, and therefore, before the current break branch (29 ) break the current, the high-speed isolation switch (6) of the current switching branches (B and C) must be separated to prevent the semiconductor devices supplying the branches from being damaged due to the high voltage break; and the current switching branches (A and D) are connected in series with the current break branch (29), having a break current flowing through it, but not supporting a high break voltage, thus needing be kept in a closed state; - then turn off the solid state DC circuit breaker (9) in the breaking branch (29) at the same time in order to switch the current to the non-linear resistance (13) in the breaking branch (29) ; e- turn off the high-speed isolation switch (6) in the current switching branches (A and D), thus completing the entire breaking process or if the line current direction is the second current direction ( 15), perform the following operations in sequence:- turn off the secondary power semiconductor devices (8) from the bidirectional semiconductor power switch (10) in the current switching branches (D) and at the same time in order to switch the current for the current break branch (29);- then turn off the high speed isolation switch (6) on the current switching branches (D) at the same time, indicated by when the line current direction is the second current direction (15), as shown in Figure 3, the switching branches of the currents (A and D) bear a high break voltage, generated when the current break branch (29) breaks the current, and therefore before of the chain break branch (29) break the chain te, the high-speed isolation switch (6) of the switching branches of the currents (A and D) must be separated to prevent the semiconductor devices supplying the branches from being damaged due to high voltage drop; and the current switching branches (B and C) are connected in series with the current break branch (29), having a break current flowing through it, but not withstanding the high break voltage and must be maintained at a closed state; - then, turn off the solid state DC circuit breaker (9) in the current break branch (29) at the same time, in order to switch the current to the non-linear resistance (13) in the current break branch ( 29); and turn off the switch and high-speed isolation (6) on the current switching branches (B and C), thus completing the entire breaking process.
    [029] The present invention also provides a method for controlling the apparatus (20) for limiting a current in a line (44), the apparatus (20) being connected in series with a line current path (44) in the which solid-state DC circuit breaker (9) in the current breaking branch (29) be closed and the high-speed isolation switch (6) and the bidirectional semiconductor power switch (10) in the current switching branches ( A, B, C and D) are closed, the control method, including the following steps: - if an instruction signal to limit the line current (44) is received, determine the direction of the line current (44); and if the direction of the line current is the first direction of the current (14), perform the following operations in sequence:- turn off the secondary power semiconductor devices (8) from the bidirectional semiconductor power switch (10) in the switching branches of the current (B and C) at the same time, so as to switch the current to the current breaking branch (29); then, turn off the high speed isolation switch (6) on the current switching branches (B and C) at the same time; and then turn off a number of solid state DC breakers (9) (at least one solid state DC breaker (9)) in the current break branch (29) in order to switch the current to a given number of non-linear resistors (13) (at least one non-linear resistor (13)) in the current breaking branch (29); or- if the direction of the line current is the second direction of current (15), perform turn off the secondary power semiconductor devices (8) from the bidirectional semiconductor power switch (10) in the current switching branches (D) at the same time, in order to switch the current to the current breaking branch (29); then, turn off the high speed isolation switch (6) on the current switching branches (D) at the same time; and then turn off a certain number of solid state DC circuit breakers (9) (at least one solid state DC circuit breaker (9)) in the current break branch (29) in order to switch the current to a certain number of non-linear resistors (13) (at least one non-linear resistor (13)) in the current breaking branch (29), thus limiting the line current (44).
    [030] The particular number is determined by an initial current value and a target threshold value.
    [031] A specific implementation of the apparatus of the present invention can be described through an application that provides an apparatus (20) that is designed to be able to limit or break the currents in two directions of a ± DC transmission line 200 kV high voltage (44) with an ability to break a transmit current of 2 kA and having a current limiting capability.
    [032] As shown in Fig. 1, the apparatus (20) comprises a current breaking branch (29) and current switching branches (A, B, Ce D). The current breaking branch (29) includes two structures, each formed by a solid state DC circuit breaker (9) and a non-linear resistor (13) which are connected in parallel, referring to the solid state DC circuit breaker (9) include at least one semiconductor feeding device (5) in one direction. In this application, the current breaking branch (29) must be able to withstand a breaking voltage of at least 400 kV and, considering a certain margin, is designed to break 600 kV; two 4.5kV/l FGTS. 6kA are connected in parallel to serve as a drive device, and considering non-uniform voltages that may occur at the time of shutdown, a certain margin needs to be defined for the voltage resistance design of the devices; a total of 200 unit s of devices need to be connected in series, which are divided into two groups, each solid state DC circuit breaker (9) includes 100 unit devices connected in series, and all FGTS have the same direction of arrangement.
    [033] The apparatus (20) also includes current switching branches (A, B, C and D), in which the current switching branches (A and B) form a first bridge arm, whose midpoint (3) is connected to one end of the line (44) and the current switching branches (C and D) form a second bridge arm, whose midpoint (4) is connected to the other side of the line (44), and the two bridge arms are both connected in parallel to the chain breaking branch (29).
    [034] The apparatus (20) requires a total of four current switching branches, each branch having the same devices. Each branch includes at least one bidirectional semiconductor power switch (10) and at least one high-speed switch (6), and the high-speed isolation switch (6) must be capable of withstanding a break voltage of 600 kV and provide quick action.
    [035] The bidirectional semiconductor power switch (10) is formed by an IGBT unit with an antiparallel diode. The bidirectional semiconductor power switch (10) only needs to withstand a very small breakout voltage. A 4.5 kV/1.6 kA IGBT unit with an anti-parallel diode can be used to form a bidirectional semiconductor power switch (10), a total of three bidirectional semiconductor power switches (10) are required and the disposition instructions for devices are shown in Fig. 2 and Fig. 3.
    [036] The above applications are used only to describe the technical solutions of the present invention and are not intended to limit the present invention. After reading this application, those skilled in the art will be able to make various variations or modifications on the present invention based on the above applications, but all such variations or modifications fall within the scope of protection of the present invention as defined by the claims.
    权利要求:
    Claims (7)
    [0001]
    1) "DEVICE FOR LIMITING THE LINE CURRENT OR CURRENT BREAKAGE AND RESPECTIVE CONTROL METHOD", comprising a current breaking branch (29), the current breaking branch (29) comprising a breaking unit or at least , two breaking units, which are connected in series, each breaking unit comprising a solid state direct current (DC) circuit breaker and a non-linear resistor (13) connected in parallel characterized by comprising a bridge branch, in which the bridge branch comprises two bridge arms formed by four identical current switching branches (A, B, C, D), wherein two of the four current switching branches are connected in series, the two formed bridge arms being , then connected in parallel, the two arm branches being connected parallel to the current breaking branch (29) and midpoints of the two bridge arms being separately connected to two ends of a line; each current switching branch (A, B, C, D) comprising at least one high speed isolation switch (6) and at least one bidirectional semiconductor power switch (10), which are connected in series; and a direction in which a current enters from the midpoint (3) of a first bridge arm and then flows through a first current switching branch in the first bridge arm, the current breaking branch (29 ), and a fourth current switching branch in a second bridge arm being defined as a first current direction (14), a direction in which a current enters from the midpoint (3) of the second bridge arm and, then flows through a third current switching branch in the second bridge arm, the current breaking branch (29), and a second current switching branch in the first bridge arm being defined as a second current direction ( 15), and a solid-state DC circuit breaker organization direction being the same as the first and second current directions.
    [0002]
    2) "DEVICE FOR LIMITING A CURRENT OF A LINE OR BREAKING A CHAIN" according to claim (1), characterized in that the bidirectional semiconductor power switch (10) is formed by two semiconductor power supply devices (7, 8) connected perpendicularly, wherein a second semiconductor supply device (5, 6, 7, 8) has on and off capabilities; and a first semiconductor power device in the first current switching branch, the second semiconductor power device in the third current switching branch, and a first semiconductor power device in the fourth current switching branch are in the same direction as the first direction. (14), and the second semiconductor power device in the first current switching branch, a first semiconductor power device in the second current switching branch, a first semiconductor power device in the third current switching branch, and the second semiconductor supply device in the fourth current switching branch are in the same direction as the second current direction (15).
    [0003]
    3) "DEVICE FOR LIMITING A CURRENT OF A LINE OR BREAKING A CURRENT" according to claim 2, characterized in that each current switching branch further comprises at least one bidirectional semiconductor power switch (10), in that the second bidirectional semiconductor power switch (10) has the same structure as that of the bidirectional semiconductor power switch (10) and is connected parallel to the bidirectional semiconductor power switch (10).
    [0004]
    4) "DEVICE FOR LIMITING A CURRENT OF A LINE OR BREAKING A CHAIN" according to claim 2, characterized in that the first semiconductor supply device does not have on and off capabilities.
    [0005]
    5) "DEVICE FOR LIMITING A CURRENT OF A LINE OR BREAKING A CURRENT" according to claim 1 or 2, characterized in that the solid state DC circuit breaker is formed by at least one semiconductor power supply device connected in series.
    [0006]
    6) "METHOD FOR CONTROLLING THE APPLIANCE", according to claim 2, to break a current, the apparatus being connected in series with a one-line current path (44), characterized by the solid state DC circuit breaker in the branch of current break (29) is closed and wherein the high-speed isolation switch (6) and the bidirectional semiconductor power switch (10) in the current switching branch are closed, and the control method comprising the following steps :- if an instruction signal to turn off a line current is received, determine a direction of the line current (44); and if the line current direction (44) is the first current direction (14), perform the following operations, then: perform the following operations in sequence, if the line current direction is the primary current direction: - turn off the secondary power semiconductor devices (8) from the bidirectional semiconductor power switch (10) on the second and third current switching branches at the same time in order to switch the current to the current breaking branch (29) ;- then turn off the high speed isolation switches (6) on the second and third current switching branches at the same time;- then turn off the solid state DC breaker on the current breaking branch (29) at the same time in order to switch the current to the non-linear resistance (13) in the current breaking branch (29); and turn off the high-speed isolation switches (6) on the first and fourth current switching branches, thus completing the entire breaking process; or if the line current direction (44) is the second current direction (15), perform the following operations in sequence: perform the following operations in sequence if the line current direction is the secondary current direction :- turn off the secondary power semiconductor devices (8) from the bidirectional semiconductor power switch (10) on the first and fourth current switching branches at the same time in order to switch the current to the current breaking branch (29 );- then turn off the high speed isolation switches (6) on the first and fourth current switching branches at the same time; and then turn off the solid state DC circuit breaker in the breaking branch (29) at the same time in order to switch the current to the non-linear resistance (13) in the breaking branch (29); and turn off the high speed isolating switches on the second and third current switching branches, thus completing the entire breakout process.
    [0007]
    7) "METHOD FOR CONTROLLING THE APPLIANCE", according to claim 2, to limit a current, the apparatus being connected in series with a one-line current path (44) characterized by the solid state DC circuit breaker in the branch of current break (29) is closed and wherein the high-speed isolation switch (6) and the bidirectional semiconductor power switch (10) in the current switching branch are closed, the control method comprising the following steps: receiving an instruction signal for limiting a line current; determining the line current direction (44) as the first current direction (14); carrying out the following operations, in sequence if the line current direction is the primary current direction: - turn off the secondary power semiconductor devices (8) from the bidirectional semiconductor power switch (10) in the second and third switching branches of current at the same time in order to switch the current to the current breaking branch (29); - then turn off the high speed isolation switches (6) on the second and third current switching branches at the same time ; and then turn off at least one solid-state DC circuit breaker in the breaking branch (29) in order to switch the current to at least one non-linear resistance (13) in the breaking branch ( 29); or performing the following operations in sequence, if the line current direction (44) is the second current direction (15): - turn off the secondary power semiconductor devices (8) from the bidirectional semiconductor power switches (10) on the first and on the fourth current switching branches at the same time in order to switch the current to the current breaking branch (29);- then turn off the high speed isolation switches (6) on the first and fourth switching branches current at the same time; and then turn off at least one solid-state DC circuit breaker in the breaking branch (29) in order to switch current to at least one non-linear resistor (13) in the breaking branch (29) , thereby limiting the line current.
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    同族专利:
    公开号 | 公开日
    AU2013376519B2|2015-11-12|
    RU2614807C2|2017-03-29|
    NO2953150T3|2018-02-17|
    EP2953150A1|2015-12-09|
    PT2953150T|2017-11-15|
    US20150372473A1|2015-12-24|
    ES2647156T3|2017-12-19|
    BR112015018164A2|2017-08-22|
    US9362734B2|2016-06-07|
    KR20150115854A|2015-10-14|
    AU2013376519A1|2015-08-06|
    KR101720112B1|2017-03-27|
    CN103972875B|2016-07-06|
    RU2015130271A|2017-03-07|
    WO2014117614A1|2014-08-07|
    EP2953150B1|2017-09-20|
    CN103972875A|2014-08-06|
    DK2953150T3|2017-11-13|
    EP2953150A4|2016-10-19|
    BR112015018164A8|2019-11-05|
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    法律状态:
    2018-11-13| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2020-01-21| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2021-05-04| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-07-13| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 27/12/2013, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    CN201310037531.3A|CN103972875B|2013-01-31|2013-01-31|Limit line current or make device and the control method thereof of electric current disjunction|
    CN201310037531.3|2013-10-31|
    PCT/CN2013/090615|WO2014117614A1|2013-01-31|2013-12-27|Apparatus for limiting current of circuit or breaking current, and control method thereof|
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