EP4162598A1 - Convertisseur et son procédé de fonctionnement - Google Patents

Convertisseur et son procédé de fonctionnement

Info

Publication number
EP4162598A1
EP4162598A1 EP20754639.1A EP20754639A EP4162598A1 EP 4162598 A1 EP4162598 A1 EP 4162598A1 EP 20754639 A EP20754639 A EP 20754639A EP 4162598 A1 EP4162598 A1 EP 4162598A1
Authority
EP
European Patent Office
Prior art keywords
voltage
sub
modules
switched
converter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP20754639.1A
Other languages
German (de)
English (en)
Inventor
Dominik ERGIN
Felix Kammerer
Sebastian Müller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens Energy Global GmbH and Co KG
Original Assignee
Siemens Energy Global GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Energy Global GmbH and Co KG filed Critical Siemens Energy Global GmbH and Co KG
Publication of EP4162598A1 publication Critical patent/EP4162598A1/fr
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/05—Capacitor coupled rectifiers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0006—Arrangements for supplying an adequate voltage to the control circuit of converters

Definitions

  • the invention relates to converters and methods for their operation.
  • an electrical converter in the form of a multilevel converter which has an at least two-phase AC voltage side with at least two AC voltage connections, a DC voltage side and modular devices comprises, each having a series circuit with at least two sub-modules electrically connected in series.
  • the sub-modules each comprise an energy store and at least two switching elements, of which at least one switching element is switched on when the sub-module is switched on or off and all switching elements are switched off in the blocked operating state.
  • a multilevel converter with a different type of sub-modules is known from the international publication WO 2015/036149 A1.
  • the invention is based on the object of specifying a converter that allows a rapid transition to normal operation after commissioning, in which the energy stores of the sub-modules are initially not sufficiently charged, and symmetrical charging conditions - based on the charging states of the module devices - during of the store can be set in a particularly simple manner.
  • the sub-modules each include a sub-module control device that determines the operating state of the sub-module by controlling the switching elements
  • the converter is designed for this after commissioning, in which all sub-modules are initially in the blocked operating state and the sub-module control devices are not yet able to communicate due to the lack of a sufficient state of charge of their assigned energy stores, initially in a first charging phase of a charging operation, which comprises at least the first and a subsequent second charging phase
  • the sub-module control devices are designed to communicate with a module control device assigned to them communicate as soon as they have become capable of communication during the first charging phase
  • the module control devices are designed to, transmitted by the sub-module control devices voltage values or sum values derived therefrom during the first charging phase to a higher-level central facility of the converter
  • the central facility is designed to switch those module control facilities in which the sum of the transmitted voltage values or the transmitted total value reaches or exceeds a specified voltage threshold to the second charging phase of the charging operation by transmits to these
  • a significant advantage of the converter according to the invention is that it can make a transition from the first charging phase to the second charging phase for each of the module devices, even if not all sub-modules of the module device in question are capable of communication and therefore cannot yet be controlled.
  • the module devices can advantageously already be transferred to an optimized charging mode in the second charging phase, in which some of the sub-modules whose energy stores are already sufficiently charged at least for communication mode are charged further in a targeted manner and others are charged in a targeted manner by one further stores are excluded. This procedure makes it possible, for example, for some of the sub-modules to have much higher charging voltages than others or the average of the sub-modules at the time when all sub-modules of all modular devices are capable of communication and can therefore be controlled.
  • Another significant advantage of the converter according to the invention is that by specifying the first and second voltage specifications, asymmetries between the states of charge of the module devices can be minimized or their occurrence prevented or at least prevented as best as possible; If, for example, the first voltage specification is selected to be greater for one of the module devices than for another module device, the total voltage of the partial module voltages in the first-mentioned module device will rise less quickly than in the second-mentioned module device, and vice versa.
  • the specified voltage threshold is dimensioned in such a way that it is reached or exceeded even if not all sub-modules of the respective module device are capable of communication.
  • the specified voltage threshold is preferably measured in such a way that it is reached or exceeded when a specified number of sub-modules of the respective module device, which is between 25% and 50%, is capable of communication.
  • the specified voltage threshold is between 25% and 50% of the total voltage to be expected in the event that all sub-modules of the respective modular device are capable of communication.
  • the first and/or the second voltage specification is preferably determined using a first external voltage value indicating the voltage on the first connection side, a second external voltage value indicating the voltage on the second connection side and/or the voltage values or total values transmitted by the module control devices .
  • the first connection side is a single-phase or multi-phase AC voltage side and the second connection side is a DC voltage side.
  • the second voltage specification is preferably determined according to:
  • the first voltage specification is preferably determined from the AC voltage side according to:
  • Uoff,setpoint f(Uac, Ufinal,setpoint, Vin,setpoint, t)
  • Vac denotes the alternating voltage present on the AC voltage side
  • Vin,setpoint denotes the second voltage specification
  • Uout,setpoint denotes the first voltage specification, with f over time t , preferably in the form of steps or ramps, is an increasing function which increases from zero to a maximum value Uout,soll,max, and where applies
  • Uout,set,max Ufinal,set - q -Uac -
  • Ufinal,soll specifies the target voltage sum from the sub-module voltages present at the energy stores of the sub-modules for each of the sub-modules after the end of the charging phase and at the beginning of normal operation, which depends on the operating point of the converter to be set at the beginning of normal operation, and where q is one in the case of half bridges as partial modules and 0.5 in the case of full bridges as partial modules.
  • the second voltage specification Uin,setpoint is preferably set to zero.
  • the first voltage specification Uout,setpoint is preferably determined according to:
  • Uoff,soll f(Uac, Udc, Ufinal,soll, t)
  • Uac the AC voltage present on the AC voltage side
  • the invention also relates to a Modulmatiein device for a converter, in particular a converter as has been described above.
  • the module control device is designed to transmit voltage values transmitted by sub-module control devices or total values derived therefrom to a higher-level central device during a first charging phase, and the module control device is also designed to transmit a first and a second voltage specification to the central device by switching at least one communication-capable sub-module to the switched-on or switched-off operating state, and continuing to charge the energy stores that are in the switched-on and blocked operating state.
  • the invention also relates to a central device for a converter, in particular a converter as has been described above.
  • the central device is designed to switch module control devices, in which the sum of transmitted voltage values or a transmitted total value reaches or exceeds a specified voltage threshold, to a second charging phase of a charging operation by providing these module control devices with a first voltage specification that switches off Concerns sub-modules, and a second voltage specification, which relates to sub-modules switched on, communicates.
  • the invention also relates to a method for operating a converter, which comprises a first connection side and a second connection side as well as module devices, each of which has a series circuit with at least two sub-modules electrically connected in series, with the sub-modules each having an energy store and at least two Include switching elements, of which at least one switching element is switched on in the switched-on or switched-off operating state of the partial module and all switching elements are switched off in the blocked operating state.
  • the converter after commissioning, in which all sub-modules are initially in the blocked operating state and sub-module control devices of the sub-modules are not yet capable of communication due to a lack of sufficient state of charge of their assigned energy stores, the converter initially enters a first charging phase of a charging operation that includes at least the first and a subsequent second charging phase, the partial module control devices, which determine the operating state of the partial module assigned to them by actuating the switching elements, each communicate with a module control device assigned to them as soon as they have become capable of communication during the first charging phase, the During the first charging phase, module control devices transmit voltage values or total values derived from them from the sub-module control devices to a higher-level central device of the converter, the central device ution those module control devices in which the sum of the transmitted voltage values or the transmitted total value reaches or exceeds a pre-specified voltage threshold, switches to the second charging phase of the charging operation by the sen module control devices a first voltage specification, the relates to switched-off sub
  • FIG. 1 shows an exemplary embodiment of a converter according to the invention
  • Figure 2 shows a first embodiment of a for
  • Figure 3 shows a second embodiment of a for
  • Figure 4 shows an embodiment of an inventive
  • Figure 5 shows an embodiment of an inventive
  • FIG. 1 shows an exemplary embodiment of a converter 10, which has a first connection side and a second connection side.
  • the first connection side is connected by a three-phase alternating voltage side 11, which has three AC voltage connections W1-W3, and the second connection side is formed by a DC voltage side 12, which has two DC voltage connections Gl and G2.
  • the converter 10 also includes six modular devices ME1-ME6, each of which has a series connection with two or more sub-modules TM electrically connected in series and a module control device MSE for controlling the sub-modules TM of the respective modular device ME1-ME6.
  • the module control devices MSE are connected to a higher-level central device ZE of the converter 10 via communication lines, which are not shown in detail in FIG. 1 for reasons of clarity.
  • the sub-modules TM each comprise a sub-module control unit TMSE, an energy store ES (see Figures 2 and 3) and at least two switching elements, of which at least one switching element is switched on both when the sub-module TM is switched on and when it is switched off and in the blocked operating state of the sub-module all switching elements are switched off.
  • the sub-module control device TMSE determines the operating state of its sub-module TM by activating the switching elements.
  • FIG. 2 shows an exemplary embodiment of a partial module TM in the form of what is known as a half-bridge module, which can be used in converter 10 according to FIG.
  • the partial module TM according to FIG. 2 comprises two switching elements S1 and S2, each of which is formed by a transistor and a freewheeling diode connected in parallel, and an energy store ES in the form of a capacitor.
  • FIG. 2 shows the submodule control device TMSE, which controls the two switching elements S1 and S2.
  • FIG. 3 shows an exemplary embodiment of a partial module TM in the form of a so-called full-bridge module, which can be used in converter 10 according to FIG.
  • the part- module TM comprises four switching elements S1 to S4, each of which is formed by a transistor and a freewheeling diode connected in parallel, and an energy store ES in the form of a capacitor.
  • FIG. 3 shows the submodule control device TMSE, which controls the four switching elements S1 to S4.
  • the module control devices MSE in the converter 10 are suitable in normal operation for ensuring a predetermined flow of energy between the two connection sides 11 and 12 of the converter 10 by activating the sub-module control devices TMSE of their sub-modules TM.
  • the sub-module control devices TMSE are not yet able to communicate due to the lack of a sufficient state of charge in their associated energy store ES; the sub-module control devices TMSE can also not yet activate their assigned switching elements S1-S2 according to FIG. 2 or S1-S4 according to FIG. 3, which is why the switching elements are also still switched off.
  • all sub-modules TM are initially in the blocked operating state because the energy stores ES are not yet sufficiently charged and therefore none of the switching elements can be switched on.
  • the converter 10 After the converter 10 has been put into operation, it is first put into a charging mode that includes a first and a second charging phase.
  • the charging operation can take place from the AC voltage side 11 or the DC voltage side 12 by applying an AC voltage to the AC voltage connections W1-W3 or a DC voltage to the DC voltage connections G1 and G2.
  • the sub-module control devices TMSE As soon as the sub-module control devices TMSE become capable of communication during the first charging phase because their energy Memory ES are sufficiently charged and can provide operating energy, they each begin to communicate with their assigned module control device MSE. As part of the communication, the sub-module control devices TMSE each transmit voltage values U, which indicate the respective voltage at their energy store ES, to the module control device MSE that is higher than them.
  • the index i identifies the assigned module device MEi, ie ME1-ME6, and thus its module control devices MSE. Since the converter 10 according to FIG. 1 has six module control devices MSE, six cumulative values Sul-Su6 are transmitted to the central device ZE.
  • the central device ZE is designed to switch those module control devices MSE for which the sum of the transmitted voltage values or the transmitted total value already reaches or exceeds a specified voltage threshold Smin to the second charging phase of the charging operation by providing these module control devices MSE with a first voltage specification Uoff ,soll, which relates to switched-off sub-modules TM, and a second voltage specification Uein,soll, which relates to switched-on sub-modules TM.
  • the modular devices ME1-ME6 are each individually placed in the second charging phase as soon as they qualify for it.
  • the first voltage specification Uout,setpoint preferably defines which total voltage switched-off sub-modules should achieve, and the second voltage specification Uin,setpoint defines which total voltage switched-on sub-modules should reach.
  • the module devices ME1-ME6 are designed to meet the first and second voltage specifications Uout,setpoint and Uein,setpoint or at least to meet them as best as possible by no, one or more of their communication-capable sub-modules TM in the switched-on operating state and none, one or several other of their communication-capable sub-modules TM in the switched-off operating state and charging the energy stores ES, which are in the switched-on and blocked operating state, continues.
  • the algorithm as to how the partial modules TM to be switched on and off are determined is arbitrary; the best possible fulfillment of the voltage specifications of the central device ZE can be determined, for example, by a simulation in the sense of computer-aided trying out all possible operating constellations of the communication-capable submodules TM and the subsequent selection of that operating constellation that guarantees the best possible fulfillment of the voltage specifications.
  • a brute force-like approach can be carried out without any problems.
  • the specified voltage threshold Smin is dimensioned in such a way that it is reached or exceeded even if not all sub-modules TM of the respective modular device ME1- ME6 are capable of communication.
  • the available charging voltage can be used advantageously for the sub-modules TM that are not yet capable of communication, so that they can communicate more quickly than would be the case if all sub-modules TM were charged simultaneously. Since the switched-on sub-modules continue to be charged, a particularly high charging voltage can be achieved for them, which is necessary for operation of the converter 10 after the end of the charging phase.
  • the specified voltage threshold Smin is preferably dimensioned such that it is reached or exceeded when a specified number of sub-modules TM, which is between 25% and 50% of the sub-modules TM of the respective modular device ME1-ME6, is capable of communication.
  • the specified voltage threshold Smin can be between 25% and 50% of the total voltage to be expected in the event that all sub-modules TM of the respective modular device ME1-ME6 were capable of communication.
  • the first and second voltage specifications are preferably calculated using a first external voltage value indicating the voltage on the AC voltage side 11, a second external voltage value indicating the voltage on the DC voltage side 12 and/or the The voltage values or sum values Sul-Su6 transmitted to the module control devices MSE are determined.
  • the second voltage specification Uin,setpoint before is preferably determined according to:
  • Vin,set f(Udc, Udc,set, t)
  • Udc designates the direct voltage applied to the direct voltage side 12 and Udc,soll a setpoint direct voltage to be set on the direct voltage side 12.
  • Uac designates the AC voltage applied to the AC voltage side 11, for example as the amplitude or effective value of the phase-to-phase voltage between the AC voltage connections W1-W3.
  • f is a function that increases over time t, preferably in a stepped or ramped manner, which increases from zero to a maximum value Uout,soll,max.
  • Ufinal,soll designates the target voltage sum from the partial module voltages U present at the energy stores ES of the partial modules TM after the end of the charging phase and at the beginning of normal operation, which depends on the operating point of the converter to be set at the beginning of normal operation.
  • q is one in the case of half bridges as partial modules TM (cf. FIG. 2) and 0.5 in the case of full bridges as partial modules TM (cf. FIG. 3).
  • the second voltage specification Uein,sollvor is preferably set to zero.
  • the first voltage specification is determined during charging from the direct voltage side 12, preferably according to:
  • Uac designates the AC voltage applied to the AC voltage side 11, for example as the amplitude or effective value of the phase-to-phase voltage between the AC voltage connections W1-W3.
  • Ufinal,soll returns the sum of the setpoint voltages from the partial motors present at the energy stores ES of the submodules TM dul voltages U after the end of the charging phase and at the beginning of normal operation, which depends on the operating point of the converter to be set at the beginning of normal operation, f is a function that increases over time t, preferably in steps or ramps, from zero to one maximum value
  • Uout,set,max Ufinal,set - 0.5 ⁇ (Udc - Uac) increases.
  • FIG. 4 shows an exemplary embodiment of a module control device MSE, which can be used in the converter 10 according to FIG.
  • the module control device MSE includes a computing device 100 and a memory 110.
  • a software program module SPM_mse is stored in the memory 110, which when executed by the computing device 100 causes the module control device MSE to operate as described above by way of example.
  • FIG. 5 shows an exemplary embodiment of a central device ZE, which can be used in the converter 10 according to FIG.
  • the central device ZE includes a computing device 200 and a memory 210.
  • a software program module SPM_ze is stored in the memory 210, which when executed by the computing device 200 causes the central device ZE to operate as described above by way of example.
  • the converter described above as an example or its operating method can have one or more of the properties or features listed below:
  • the operating method described for active pre-charging makes it possible to compensate for asymmetries between the six module devices ME1-ME6 during the active charging phase. If the pre-charging takes place from the AC side, a vertical symmetry of the upper or lower three modules with respect to one another is possible. If the converter 10 is pre-charged from the DC system, it is possible to balance all six modular devices ME1-ME6 with one another.
  • the release of the active loading phase can also take place if not all sub-modules TM in a module device ME1-ME6 have reported back as ready for operation. Asymmetries in the module voltage distribution within a converter arm can be reduced using the operating procedure presented as soon as there is a sufficient number of sub-modules in an operational state.
  • the operating method thus allows partially active converters 10 to be started up both when pre-charged from the AC side and when pre-charged from the DC side.
  • the operating method allows the passive charging voltage of the DC system to be increased from the AC side during active pre-charging. As a result, transient transients can be prevented when switching to normal operation. This minimizes the load on all system components and repercussions on the AC grid.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

L'invention se rapporte, entre autres, à un convertisseur (10) comprenant des dispositifs de module (ME1-ME6) qui présentent chacun une connexion en série à au moins deux modules partiels (TM) connectés électriquement en série. Selon l'invention, un dispositif central (ZE) est conçu pour commuter des dispositifs de commande de module (MSE), dans lesquels la somme des valeurs de tension transmises ou la valeur de somme transmise (Su1-Su6) atteint ou dépasse un seuil de tension prédéfini, vers une seconde phase de charge d'une opération de charge par la transmission d'une première spécification de tension (Uaus,soll) se rapportant à des modules partiels (TM) mis hors tension et une seconde spécification de tension (Uein,soll) se rapportant à des modules partiels (TM) mis sous tension auxdits dispositifs de commande de module (MSE), les dispositifs de module (ME1-ME6) étant conçus pour satisfaire ou au moins satisfaire approximativement les première et seconde spécifications de tension (Uaus,soll, Uein,soll) par le réglage d'aucun, d'un ou de plusieurs modules desdits modules partiels (TM) aptes à la communication correspondants dans un état de fonctionnement sous tension et d'aucun, d'un ou de plusieurs modules desdits autres modules partiels (TM) aptes à la communication correspondants dans un état de fonctionnement hors tension, et pour continuer la charge des accumulateurs d'énergie (ES) qui se trouvent dans l'état de fonctionnement sous tension et bloqué.
EP20754639.1A 2020-07-24 2020-07-24 Convertisseur et son procédé de fonctionnement Pending EP4162598A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2020/070903 WO2022017617A1 (fr) 2020-07-24 2020-07-24 Convertisseur et son procédé de fonctionnement

Publications (1)

Publication Number Publication Date
EP4162598A1 true EP4162598A1 (fr) 2023-04-12

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Application Number Title Priority Date Filing Date
EP20754639.1A Pending EP4162598A1 (fr) 2020-07-24 2020-07-24 Convertisseur et son procédé de fonctionnement

Country Status (3)

Country Link
US (1) US20230291326A1 (fr)
EP (1) EP4162598A1 (fr)
WO (1) WO2022017617A1 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013218207A1 (de) 2013-09-11 2015-03-12 Siemens Aktiengesellschaft Modularer Mehrpunktstromrichter für hohe Spannungen
JP6158099B2 (ja) * 2014-01-07 2017-07-05 株式会社日立製作所 電力変換装置およびその制御方法
EP3659248A1 (fr) * 2017-07-27 2020-06-03 American Superconductor Corporation Schéma de commutation pour compensateurs synchrones statiques utilisant des convertisseurs en pont en h en cascade
EP3522357A1 (fr) * 2018-01-31 2019-08-07 Siemens Aktiengesellschaft Convertisseur modulaire multi-niveaux
CN108471251B (zh) * 2018-04-27 2019-12-06 广州供电局有限公司 半桥与全桥混合的模块化多电平换流器的启动方法及装置

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US20230291326A1 (en) 2023-09-14

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