• 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 invention relates to a method and a device for adjusting the delay time of at least one semiconductor valve (7a, 7b, 7c) of a converter parallel circuit (1a, 1b, lc) when the ignition angle between two conducting periods of the semiconductor valve changes. In order to achieve the most uniform possible distribution of current to all the parallel-connected semiconductor valves (7a, 7b, 7c), it is provided that after changing the ignition angle, a new delay time is determined, which results from the old delay time Ata before the change of the ignition angle from the old one Ignition angle aa and from the new ignition angle gives as follows: Atn = Ata * sin (aa) / sin (an).
    公开号:AT512886A1
    申请号:T501482012
    申请日:2012-04-26
    公开日:2013-11-15
    发明作者:Vladislav Dipl Ing Damec；Alexander Dipl Ing Fh Trnka；Gerrit Puerstl
    申请人:Siemens Ag；
    IPC主号:
    专利说明:

    Γζ D3 586 I 1 [10 ^ 12/50148
    description
    Method and device for adjusting the delay time of a semiconductor valve 5
    Technical area
    The invention relates to a method for adjusting (pre-control) the delay time of at least one semiconductor valve of a converter parallel circuit when the ignition angle between two conducting periods of the semiconductor valve changes, as well as a corresponding device. The parallel converter circuit comprises at least two semiconductor valves connected in parallel between an alternating current or three-phase connection 15 on the one hand and a direct current connection on the other. As semiconductor valves, for example, thyristors, IGBTs or GTOs are used. The semiconductor components may have a positive as well as a negative temperature characteristic. The invention 20 is particularly applicable to semiconductor valves in
    Rectifiers of excitation systems for synchronous machines, wherein a plurality of rectifiers are connected in parallel.
    The ignition angle of a semiconductor valve describes the difference between the zero crossing of the alternating voltage, which is to be rectified by the semiconductor valve, and the time of ignition of the semiconductor valve with respect to the present at this time phase position of the alternating voltage. The ignition angle is used to set the 30 output voltage of the converter.
    A change in the ignition angle between two conducting periods of the semiconductor valve is also referred to as ignition angle jump. This Zündwinkelsprung can be predetermined for example by the control of the synchronous machine. When a spark angle jump occurs, it causes a changed applied voltage at the commutation inductance. A commutation or commutation inductor causes
    FIG. 2 shows a delay of the current increase in the turn-on torque of the semiconductor valve. Too high a rate of current rise could destroy the silicon structure of the semiconductor valve. The change in the applied voltage at the commutation inductance also alters the steepness of the temporal current profile.
    Large firing angle jumps of more than 10 ° may occur, such as due to shock excitation due to a change in the load of the synchronous machine, where firing jumps of several tens of degrees, say 40-70 °, are not uncommon. Large ignition angle jumps lead to large current deviations in so-called symmetrical systems. In balanced systems, multiple semiconductor valves are connected in parallel 15 and each semiconductor valve provides approximately the same current.
    A control method for such a balanced system is known, for example, from AT 509 828 A1. The current distribution of parallel-connected branches of semiconductor valves depends primarily on the semiconductor parameters, the thermal conditions and parasitic influences, such as the leakage inductances of a system. According to AT 509 828 A1, in each case a partial flow flowing through the respective semiconductor valve 25 is detected over a period of time and supplied to a symmetry control. For each of these detected partial flows, an averaging is performed and from the resulting average values, the actual current and the common ignition angle, a respective respective ignition angle correction is derived for each semiconductor valve, so that the
    Strains of the semiconductor valves are approximated to each other. Thus, there is an active current balancing, in which the firing pulses of the parallel-connected semiconductor valves are shifted in time by the type of control so that each parallel branch leads approximately the same load current. Due to the staggered ignition (time offset in the microsecond range) so the current transfer of the individual valves is influenced so that possibly also
    "586
    NO 201 ^ / 50148 3 without equalizing chokes and without symmetrical busbar or parameter selection the parallel branches can be loaded evenly. 5 An ignition angle jump now causes deviations from the symmetrical current distribution to all semiconductor valves. These deviations may even be worse in the worst case than if all the semiconductor valves ignite simultaneously. 10
    If a commutation inductance is provided, then the smaller the voltage at the commutation inductance, the lower the current steepness of the overall system, and therefore the required delay time, which is required for a symmetrical current split, is greater.
    PRIOR ART EP 0 664 613 A2 discloses a method for balancing the load of power semiconductor modules connected in parallel, where the switch-on and switch-off times of the switches of the modules are set such that a uniform current distribution results when switching to all modules. 25 In this case, a module can be turned on later, if the difference between the setpoint and actual value of the current is negative, ie the actual current is greater than the target current.
    However, EP 0 664 613 A2 does not specify the extent to which the switching time must shift.
    DESCRIPTION OF THE INVENTION It is therefore an object of the present invention to provide a
    To provide method, with which the timing of ignition of at least one semiconductor valve in advance of the change in the ignition angle between two lead periods so
    m 586 föt 4, it is stipulated that as uniform a distribution of current as possible remains present on all the parallel-connected semiconductor valves. This object is achieved by a method having the features of patent claim 1. Advantageous embodiments of the invention are defined in the respective dependent claims. Claim 1 relates to a method for adjusting the
    Delay time of at least one semiconductor valve of a converter parallel circuit when changing the ignition angle between two periods of the semiconductor valve and provides that after changing the ignition angle, a new delay time 15 is given, resulting from the old delay time Ata before the change of the ignition angle, from the old firing angle aa and from the new firing angle as follows: Atn = Ata * sin (aa) / sin (an). The new delay time is therefore the product of the old delay time and the quotient of the sine of the old ignition angle and the sine of the new ignition angle.
    In simulations it has been confirmed that with the method according to the invention, after an ignition angle jump and after changing the delay time, an at least approximate symmetry of the currents in the individual semiconductor valve branches of the power converters, in particular the rectifier, can again be produced. 30 A parallel converter circuit usually has two to eight power converters connected in parallel, in the case of excitation systems rectifier on. Each power converter in turn has a plurality of semiconductor valves, two per phase. In this case, only a semiconductor valve or a phase in the rule 35 no delay time. For all others
    Semiconductor valves with delay time, it makes sense that a new delay time is given. It can therefore be provided that when several parallel
    : 27.04 ^ 12 CO; r züiZUj586
    5
    Semiconductor valves for all semiconductor valves a new delay time is given, which have a delay time before changing the ignition angle. 5 It is also possible to reduce the
    Control effort only for larger changes for one or more semiconductor valves to set a new delay time. For example, it may be provided that a new delay time is calculated only after a change in the ignition angle of more than, for example, 10.degree.
    A corresponding device according to the invention comprising a parallel converter circuit with a plurality of parallel-connected semiconductor valves and a control device 15 for adjusting the delay time of at least one semiconductor valve provides for carrying out the method according to the invention that the control device after changing the ignition angle, a new delay time can be predetermined, resulting from the old 20 delay time Ata before the change of the ignition angle, from the old ignition angle aa and from the new ignition angle as follows:
    Atn = Ata * sin (aa) / sin (an). Since the control of the semiconductor valves as well as the calculation of the new delay times of the semiconductor valves is usually carried out by means of an electronic data processing system, ie a computer, the invention also includes a computer program with program code means to carry out the method according to the invention the computer program is running on a computer. Accordingly, a computer program product is also provided, comprising program code means 35 of a computer program stored on a computer-readable data carrier in order to carry out the method according to the invention when the computer program is executed on a computer. * 2ΌΤ2Ίή586
    6
    Brief description of the figures
    To further explain the invention, reference is made in the following part of the description to the figures, from which further advantageous embodiments, details and further developments of the invention can be found. Show it:
    1 shows a basic circuit of three rectifiers, FIG. 10 shows the circuit configuration of the three rectifiers of FIG. 1 to which the method according to the invention can be applied,
    3 shows a diagram of the current profile of three semiconductor valves before an ignition angle jump, FIG. 4 shows a diagram of the current profile of three
    Semiconductor valves after a positive ignition angle jump without setting the delay time according to the invention,
    5 shows a diagram of the current profile of three semiconductor valves after the positive ignition angle jump with 20 inventive adjustment of the delay time,
    6 shows a diagram of the current profile of three semiconductor valves after the positive ignition angle jump with ideal setting of the delay time,
    7 shows a diagram of the current profile of three 25 semiconductor valves after a negative ignition angle jump without adjusting the delay time according to the invention,
    8 shows a diagram of the current profile of three semiconductor valves after the negative ignition angle jump with adjustment of the delay time according to the invention. 30
    Embodiment of the invention
    To supply a load 2, for example, a 35 excitation circuit of a generator, in Fig. 1 to a supply network 3 via a network connection 5 and a transformer 4, for example, three power converters la, lb, lc connected in parallel. For each rectifier la, 7 7
    'Ü'3 586 lb, lc, a commutation inductance (commutation inductor) 6a, 6b, 6c is provided, which limit the current changes (di / dt values) of the parallel-connected branches in the time interval of the current commutation. 5
    In Fig. 2 is simplified to see the excitation system for synchronous machines with three parallel rectifiers la, lb, lc of Fig. 1, namely the training of the rectifier in each case as a so-called B6 bridge. On the DC side, a load 2 is connected to the rectifiers 1a, 1b, 1c. On the AC side, the converters la, lb, lc are connected to three phases. Accordingly, each power converter la, lb, lc comprises six semiconductor valves 7a, 7b, 7c. The rectified current of each B6 bridge is supplied to a common line which then feeds the load 2, a field winding of the synchronous machine. Each semiconductor valve 7a, 7b, 7c is supplied by a control device 9, a control voltage which defines both the time of ignition and the ignition angle. 20
    The processes are explained with reference to the three semiconductor valves 7a, 7b, 7c, which ignite during a positive voltage of the first phase 8a, that is, which are arranged in the positive current branch of the first phase 8a. Through each 25 of these semiconductor valves 7a, 7b, 7c thereby flows
    Partial flow la, lb, lc. The three semiconductor valves 7a, 7b are ignited according to a symmetry control, such as that of AT 509 828 A1, at different times. Due to the time-delayed ignitions, the power converters 30 la, lb, lc have approximately the same load.
    The symmetry regulation is carried out by determining the current deviations of the partial currents Ia, Ib, Ic from the mean value. The current deviations form the input variables for the actual balancing control. The respective current deviation is supplied, for example, to a respective integral controller. To obtain a Zündwinkelkorrektur the respective resulting control variable in a delay time
    8 201203586 converted. In this case, the common ignition angle and the actual current value are taken into account. This delay time is then forwarded via the control device 9 to each of the eighteen semiconductor valves 7a, 7b, 7c here, so that they ignite at the predetermined time. In Fig. 2, for simplicity, only the connection of the control device 9 with the rectifiers la, lb, lc shown.
    The control device 9 comprises a computer which, in the case of an ignition jump, is then calculated from the predefined values of the old delay time (s) Ata before the change of the ignition angle, the old ignition angle cxa and the new ignition angle to the new delay time (s).
    FIGS. 3-8 show the current profile of three semiconductor valves 7a, 7b, 7c over time. On the horizontal axis, the time is plotted in milliseconds, each representing about 7 milliseconds. On the vertical axis, the current is plotted in amperes, ranging from 0 to a maximum of 250 amps.
    FIG. 3 shows the current profile of three semiconductor valves 7a, 7b, 7c before a spark angle jump according to a simulation calculation. The current Ia, Ib, Ic after each semiconductor valve is plotted here as a function of time during a conducting period of the semiconductor valve. In this starting position all three currents are on average the same over time, ie symmetrical, there is a symmetrized system. The first semiconductor valve 7a provides a time average of 132.1 A for Ia, the second semiconductor valve provides 132.2 A for Ib and the third semiconductor valve 132.6 A for Ic.
    In this case, the first semiconductor valve 7a starts with a delay time of 216 ps and the second semiconductor valve 7b with a delay time of 50 ps. The third semiconductor valve 7c has no delay time. The - ψΰΊ2ν358β
    9 current (old) ignition angle aa is 30 ° for all semiconductor valves.
    What happens when the ignition angle jumps without precontrol 5 (adjustment) of the delay time from 30 ° to 87 °, is shown in Fig. 4: the first semiconductor valve 7a delivers only 124.5 A more than Ia, the second semiconductor valve provides only 124, 1 A as Ib and the third semiconductor valve 144.3 A as Ic. Due to the delay of the individual 10 semiconductor valve branches would not be guaranteed in the real case that the first semiconductor valve 7a also ignites, because at the time of ignition, the commutation, ie the transition of the current flow to another semiconductor valve branch is already completed. 15
    However, if the first semiconductor valve 7a does not fire, the second 7b and the third semiconductor valve 7c become extremely overloaded, which would cause them to be shut down or even destroyed. Therefore, according to the present invention, the delay time of the first semiconductor valve becomes 0.000216 sec
    Atn = 0.000216 * sin (30 °) / sin (87 °) = 0.000108 s (108 μβ). 25
    The delay time of the second semiconductor valve 7b is then 15 με according to the invention. It can be seen from FIG. 5 that the current Ia of the first semiconductor valve 7a in the conduction period is 134.8 A, that of the second semiconductor valve 130.4A and that of the third one
    Semiconductor valve 131.5 A. Thus, there is again an approximately symmetrical system.
    As can be seen from FIG. 6, a delay time of 114 με for the first 7a and 24 με for the second semiconductor valve 7b would be necessary for an ideally balanced system. Then, the current Ia of the first semiconductor valve in the conduction period would be 132.3 A, that 10 10 2012/50148 of the second semiconductor valve 131.4 A and that of the third semiconductor valve 131.9 A.
    FIGS. 7 and 8 show a further example of the method according to the invention. It starts from the fully symmetrized system in FIG. 6, where the ignition angle is 87 ° and the delay times for the first semiconductor valve 7a are 114 με and for the second semiconductor valve 7b is 24 με. FIG. 7 shows what happens when the ignition angle of 87 ° returns to 30 ° without precontrol (setting) of the delay time. The first semiconductor valve 7a now supplies 152.9 A as Ia, the second semiconductor valve 7b supplies 126.6 A as Ib and the third semiconductor valve 7c only 117.4 A as Ic. Thus, there is a large imbalance, which again can lead to destruction or shutdown of the semiconductor valves 7a, 7b, 7c.
    If, however, the delay times are changed according to the invention, namely to 228 με for the first semiconductor valve 7a and 48 μ3 for the second semiconductor valve · 7b, this results in current characteristics as shown in FIG. The first semiconductor valve 7a now supplies on average 130.2 A as Ia during one conduction period, the second semiconductor valve 7b supplies 25,134 A as Ib and the third semiconductor valve 7c as 132.5 A as
    Ic. Again, there are almost perfectly balanced semiconductor valve branches.
    Of course, what has been described here only for one half-wave of a phase 8a is carried out in the same way for the second half-wave and for all other phases 8b, 8c, using the same control device 9. 35
    List of Reference Numerals: la first rectifier
    : äthJ / O358 6
    i
    11 lb second rectifier lc third rectifier 2 load 3 supply network 4 transformer 5 mains connection 6a first commutation inductor 6b second commutation inductor 6c third commutation inductor 10 7a first semiconductor valve 7b second semiconductor valve 7c third semiconductor valve 8a first phase 8b second phase 8c third phase 9 control device 1a first partial flow Ib second partial flow
    Ic third partial flow
    权利要求:
    Claims (6)
    [1]
    : 27-1: ΌΪ2ό358 6

    1. A method for adjusting the delay time of at least one semiconductor valve (7a, 7b, 7c) of a 5 parallel converter circuit (la, lb, lc) when changing the ignition angle between two periods of the semiconductor valve, characterized in that after changing the ignition angle, a new delay time is given, which results from the old delay time 10 Ata before the change of the ignition angle, from the old ignition angle aa and from the new ignition angle as follows: Atn = Ata * sin (aa) / sin (an).
    [2]
    2. The method according to claim 1, characterized in that at a plurality of parallel-connected semiconductor valves (7a, 7b, 7c) for all semiconductor valves (7a, 7b) a new delay time is preset, which have a delay time before changing the ignition angle.
    [3]
    3. The method of claim 1 or 2, characterized 20 characterized in that only after a change in the ignition angle of more than 10 °, a new delay time is calculated.
    [4]
    4. A device for carrying out a method according to one of claims 1 to 3, comprising a 25 parallel converter circuit (la, lb, lc) with a plurality of 13 Jt / üj586 31 HHil parallel semiconductor valves (7a, 7b, 7c) and a control device (9) for setting the delay time of at least one semiconductor valve, characterized in that with the control device (9) after changing the ignition angle, a new delay time can be predetermined, resulting from the old delay time Ata before the change of the ignition angle, from the old ignition angle aa and from the new Ignition angle is as follows: Atn = Ata * sin (aa) / sin (an).
    [5]
    A computer program comprising program code means for performing the method of any one of claims 1 to 3 when the computer program is run on a computer.
    [6]
    A computer program product comprising program code means of a computer program stored on a computer-readable medium for carrying out the method according to one of claims 1 to 3 when the computer program is executed on a computer.
    类似技术:
    公开号 | 公开日 | 专利标题
    EP3022836B1|2017-06-07|Overvoltage protection for active rectifiers in the event of load shedding
    EP2289145B1|2018-12-26|Regulation method for a high voltage dc transmission plant with dc link and self-commutated inverters
    DE102011005050A1|2011-10-06|Control method for power converter parallel connection of common supply system that is utilized in power plant generator, involves performing angle correction such that stresses of valves are converged on one another
    AT512886B1|2014-03-15|Method and device for adjusting the delay time of a semiconductor valve
    DE112015002279T5|2017-02-09|ENERGY CONVERSION DEVICE
    DE102012100673A1|2013-08-01|Device for supplying electrical energy from e.g. photovoltaic current generating device to low voltage-mains supply, has switching units connected to coupling units to switch coupling units between phases based on power difference quantity
    DE102012224336A1|2014-06-26|Method for operating an electric power converter and electric power converters
    WO2006015952A1|2006-02-16|Method for operating a two-phase rotary current controller
    AT511283B1|2013-01-15|DEVICE AND METHOD FOR CORRECTING LINEAR FLOW OF A THREE-PHASE MACHINE
    EP3369167B1|2021-06-30|Network feedback unit and electrical drive system
    EP3291411B1|2019-05-08|Method for controlling an uninterruptible power supply and installation for an uninterruptible power supply
    DE102012221670A1|2014-05-28|DC / DC converter with efficiency-adjusted adjustment of the operating frequency
    EP3161921A1|2017-05-03|Method for interrupting an electric current in a dc line and application of said method
    DE102015216892A1|2017-03-09|Method for controlling a modular multi-level converter, controller for a modular multi-level converter and modular multi-level converter with the control device
    DE102007060330A1|2009-06-25|Power supply for generating temporally specifiable, controlled and regulated current waveforms and method
    EP3300242B1|2020-10-28|Regulation of a three-level inverter
    EP2928055B1|2019-02-06|Modular power converter and method for generating a sinusoidal output voltage with reduced harmonics
    DE102012213725A1|2014-02-06|Method for controlling converter parallel circuit including converters used as rectifiers in power plant exciter system of synchronous machine, involves correcting ignition angle adaptations such that temperature values approach each other
    EP2026455B1|2012-03-14|Method for operating an electrical switch and corresponding electrical switch to avoid electrical surges on loads fed by inverters
    DE102018217977A1|2020-04-23|Method and device for adjusting PWM values of a field-oriented control of an electrical machine
    EP2534749B1|2018-06-27|Control of a modular multilevel converter with an observer for the currents and an estimator for the energy of the intermediate circuit
    WO2015086416A1|2015-06-18|Cycloconverter having reactive-power reduction by using zero-voltage components
    DE112018004466T5|2020-08-20|POWER CONVERSION SYSTEM
    DE1538538A1|1970-08-13|Circuit arrangement for dimmer
    AT501410B1|2008-05-15|METHOD AND ARRANGEMENT FOR PRODUCING A WELDING CURRENT AND MULTI-POINT RESISTANCE WELDING MACHINE
    同族专利:
    公开号 | 公开日
    AT512886B1|2014-03-15|
    DE102013206888A1|2013-10-31|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    JPH01185167A|1988-01-11|1989-07-24|Toshiba Corp|Ac to dc converter|
    DE4038869C1|1990-12-01|1991-08-01|Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt, De|Current symmetrising circuitry for parallel converters - having branches of semiconductor switches and phase outputs coupled together via choke coils|
    US5576944A|1994-02-28|1996-11-19|Kabushiki Kaisha Toshiba|Plural parallel bridge inverter power conversion system with balanced DC input currents|
    US5963441A|1998-09-03|1999-10-05|Eaton Corporation|Alternating current rectifier bridge and system for measuring average current per bridge segment|
    US20090167080A1|2007-12-26|2009-07-02|Carpenter Brian A|Current balancing for multi-phase converters|
    US20100109621A1|2008-11-05|2010-05-06|Kisun Lee|Current balancing circuit and method|
    AT509828A1|2010-03-30|2011-11-15|Siemens Ag|CONTROL METHOD OF A CURRENT TRIGGER INTERCONNECTION|
    US20120049813A1|2010-08-30|2012-03-01|Upi Semiconductor Corp.|Current balancer|
    US20120086418A1|2010-10-11|2012-04-12|Richtek Technology Corporation, R.O.C.|Multi-phase switching regulator and driver circuit and control method thereof|DE102012213725A1|2012-08-02|2014-02-06|Siemens Aktiengesellschaft|Method for controlling converter parallel circuit including converters used as rectifiers in power plant exciter system of synchronous machine, involves correcting ignition angle adaptations such that temperature values approach each other|
    DE102013225309A1|2013-12-09|2015-06-11|Siemens Aktiengesellschaft|Control method of a parallel converter circuit|DE59410054D1|1994-01-22|2002-03-28|Daimlerchrysler Rail Systems|Method and device for balancing the load of power semiconductor modules connected in parallel|CN106230277A|2016-08-16|2016-12-14|株洲变流技术国家工程研究中心有限公司|The control method of multicomputer parallel power supply system based on thyristor rectifier and device|
    法律状态:
    2019-12-15| MM01| Lapse because of not paying annual fees|Effective date: 20190426 |
    优先权:
    申请号 | 申请日 | 专利标题
    AT501482012A|AT512886B1|2012-04-26|2012-04-26|Method and device for adjusting the delay time of a semiconductor valve|AT501482012A| AT512886B1|2012-04-26|2012-04-26|Method and device for adjusting the delay time of a semiconductor valve|
    DE201310206888| DE102013206888A1|2012-04-26|2013-04-17|Method for adjusting delay time of e.g. thyristor of power converter parallel circuit in rectifier of generator exciter, involves defining delay time obtained from old delay time, before change of firing angle and from another firing angle|
    [返回顶部]