WO2014141436A1 - Système de conversion de puissance et procédé de commande de ce dernier - Google Patents

Système de conversion de puissance et procédé de commande de ce dernier Download PDF

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Publication number
WO2014141436A1
WO2014141436A1 PCT/JP2013/057223 JP2013057223W WO2014141436A1 WO 2014141436 A1 WO2014141436 A1 WO 2014141436A1 JP 2013057223 W JP2013057223 W JP 2013057223W WO 2014141436 A1 WO2014141436 A1 WO 2014141436A1
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WO
WIPO (PCT)
Prior art keywords
voltage
power conversion
conversion system
rotating machine
current
Prior art date
Application number
PCT/JP2013/057223
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English (en)
Japanese (ja)
Inventor
順弘 楠野
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株式会社日立製作所
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Publication date
Application filed by 株式会社日立製作所 filed Critical 株式会社日立製作所
Priority to PCT/JP2013/057223 priority Critical patent/WO2014141436A1/fr
Priority to JP2015505167A priority patent/JP5855790B2/ja
Priority to TW102146372A priority patent/TWI505625B/zh
Publication of WO2014141436A1 publication Critical patent/WO2014141436A1/fr

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    • 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
    • H02M7/53—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 using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/538—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a push-pull configuration
    • H02M7/53803—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a push-pull configuration with automatic control of output voltage or current
    • 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
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • 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
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters
    • 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
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
    • H02M5/10—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers
    • H02M5/12—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers for conversion of voltage or current amplitude only

Definitions

  • the present invention relates to a power conversion system and a control method therefor, and in particular, a power suitable for a technique for combining a power converter including a plurality of semiconductor switching elements and an electrical device and continuing operation even when the semiconductor switching element fails.
  • the present invention relates to a conversion system and a control method thereof.
  • Power converters such as inverters and converters are composed of semiconductor switching elements such as power MOSFETs (Metal Oxide Semiconductors Field Field Effect Transistors), IGBTs (Insulated Gate Bipolar Transistors) and GTOs (Gate Turn Off Thyristors).
  • MOSFETs Metal Oxide Semiconductors Field Field Effect Transistors
  • IGBTs Insulated Gate Bipolar Transistors
  • GTOs Gate Turn Off Thyristors
  • Such a power converter can convert electric power into a desired form such as AC / DC conversion by controlling on / off of these semiconductor switching elements.
  • a 50 Hz / 60 Hz frequency conversion station of an AC transmission network in an electric power system an AC / DC conversion station that connects the AC transmission network and the DC transmission network, or natural conditions. It is used in wind power generation systems and solar power generation systems that transmit generated power by matching the power grid frequency.
  • Power converters used in power system systems can continue power conversion operation even when some of the components that make up the power converter fail because a failure of the power converter causes a power failure. Desired. Moreover, in a wind power generation system or a solar power generation system, since a power generation stoppage due to a failure becomes a profit or loss of power sales of a power generation company, it is important to minimize the power generation stoppage period and improve the facility operation rate. In locations where access for maintenance is difficult, such as offshore and mountainous areas, it is particularly important that the power generation system can continue operation when the power converter fails.
  • Patent Document 1 discloses a detection signal for detecting voltage application between main electrodes of a self-extinguishing semiconductor switching element and self Means for detecting a short circuit fault, an open fault, or a drive circuit abnormality of a self-extinguishing semiconductor switching element by comparing drive signals for turning on and off the arc extinguishing semiconductor switching element are disclosed.
  • Patent Document 2 discloses a power having at least two phase modules configured by connecting a large number of single-phase power conversion modules in series. In the converter, when the single-phase power conversion module constituting the phase module fails, the voltage output from the corresponding single-phase power conversion module of other healthy phase modules is controlled to be zero. A technique for continuing power conversion is disclosed.
  • Patent Document 3 discloses that a self-quenching semiconductor switching element and a switching module composed of a rectifying diode element connected in reverse parallel thereto are electrically connected in parallel with a pressure contact switching element, A technique is disclosed in which power conversion is continued by causing a pressure-contact type switching element to be in a short-circuited state when the arc-extinguishing type semiconductor switching element fails.
  • the voltage shared by a healthy module increases as the number of failed modules increases.
  • the maximum voltage (withstand voltage) that can be withstood by the self-extinguishing semiconductor switching element and the free-wheeling diode element used in the module is specified, and even if a failure occurs with respect to the total number of modules constituting the phase
  • the voltage applied to each healthy module at the time of failure is always self-extinguishing semiconductor switching that constitutes the module It is necessary to make it lower than the withstand voltage upper limit value of the element or the like.
  • the present invention has been made in view of the above points, and the object of the present invention is to be applied to a power converter even when a module such as a self-extinguishing semiconductor switching element constituting the power converter fails.
  • An object of the present invention is to provide a power conversion system capable of reducing the generated voltage and a control method thereof.
  • a power conversion system of the present invention includes a switching module including a self-extinguishing semiconductor switching element and a rectifying element connected in reverse parallel to the self-extinguishing semiconductor switching element, A power converter configured by connecting in series a plurality of circuits comprising a failure detection means for detecting a failure of a switching module and a short-circuit device for electrically short-circuiting the switching module detected by the failure detection means.
  • DC unit voltage means for detecting a DC unit voltage of the power converter, an AC unit voltage lowering mechanism for reducing the AC unit voltage of the power converter, and the failure detection unit detects a failure of the switching module. If detected, the voltage command value of the DC voltage of the power converter is lowered to lower the DC voltage than when healthy,
  • a control device for outputting an operation signal to the AC unit voltage drop mechanism is characterized in that a control device for outputting an operation signal to the AC unit voltage drop mechanism.
  • a method for controlling a power conversion system includes a self-extinguishing semiconductor switching element and a rectifying element connected in reverse parallel to the self-extinguishing semiconductor switching element.
  • a circuit comprising a switching module, a failure detector that detects a failure of the switching module, and a short-circuit device that electrically short-circuits the switching module that has detected the failure by the failure detector is connected in series.
  • the DC voltage of the power converter is detected by the DC voltage detection means, and when the failure detector detects a failure of the switching module, the control device uses the voltage command for the DC voltage of the power converter. By reducing the value, the DC voltage is lowered than when healthy, and the operation signal is output to the AC voltage drop means. And wherein the door.
  • the voltage applied to the power converter can be reduced and applied to a healthy module. If the voltage exceeds the withstand voltage, there will be no chain failures and continuation of operation can be realized.
  • FIG. 5 is a schematic configuration diagram of an example in which a load-type tap switching transformer and a permanent magnet type rotating machine or a winding type synchronous machine are used as an AC unit voltage reduction mechanism according to a second embodiment of the power conversion system of the present invention.
  • Example 2 of the power conversion system of this invention is a schematic block diagram of the example which used the tap switching transformer at the time of loading and a winding type
  • FIG. 5 is a characteristic diagram showing the relationship between the rotational speed and the induced voltage in the case of the wound secondary excitation rotating machine shown in FIG. 4.
  • FIG. 7 It is a characteristic view which shows the relationship between the rotation speed and induced voltage in case the 1st and 2nd rotary machine shown in FIG. 7 is a coil
  • FIG. 8 is a characteristic diagram showing the relationship between the rotational speed and the induced voltage when the first rotating machine shown in FIG. 7 is a permanent magnet type rotating machine or a winding type synchronous machine, and the second rotating machine is a winding type secondary excitation rotating machine. is there.
  • FIG. 1 shows a first embodiment of the power conversion system of the present invention.
  • a power converter 1 includes a semiconductor switching module 4 including a self-extinguishing semiconductor switching element 2 and a diode element 3 which is a rectifying element connected in reverse parallel thereto, and the semiconductor switching module 4
  • a plurality of circuits composed of a failure detector 6 for detecting a failure of the device and a short-circuit device 5 that is connected in parallel to the semiconductor switching module 4 and electrically short-circuits the semiconductor switching module 4 that has detected the failure by the failure detector 6 in series.
  • a phase circuit is configured by connection.
  • the short-circuit device 5 may be operated by the short-circuit device alone, or may be operated by the detection value of the failure detector 6.
  • a smoothing capacitor 7 is mounted on the DC portion of the power converter 1, and the voltage across the smoothing capacitor 7 is monitored by the capacitor voltage detector 8.
  • the DC voltage detection is performed by the smoothing capacitor 7 and the capacitor voltage detector 8. Means are formed.
  • the AC section of the power converter 1 is connected to a transformer 12 with a load-on tap changer (AC voltage drop means) 12 that can perform tap switching while a load current is applied by an external signal.
  • the current flowing through the electric circuit connecting the transformer 12 with the time tap changer is monitored by the current detector 9, and the voltage at the connection point 13 between the power converter 1 and the power system 26 is monitored by the voltage detector 10. Yes.
  • the failure detector 6 detects a failure of the semiconductor switching module 4
  • the voltage command value of the DC section voltage of the power converter 1 is decreased to reduce the DC voltage from the normal state, and the on-load tap changer A control device 11 for outputting an operation signal to the attached transformer 12 is provided.
  • the control device 11 that controls the power converter 1 incorporates control means for controlling the voltage of the smoothing capacitor 7 to a predetermined voltage, and detects each of the detection values described above, that is, the capacitor voltage by the capacitor voltage detector 8. Feedback control is performed using the value S1, the current detection value S2 by the current detector 9, and the voltage detection value S3 by the voltage detector 10. The control method in this case is shown in FIG.
  • the capacitor voltage detection value S1, the current detection value S2, the voltage detection value S3 and the state signal S4 of the semiconductor switching module 4 detected by the capacitor voltage detector 8 are input.
  • a semiconductor switching element drive signal S5 for controlling to a predetermined capacitor voltage command value S1 * is calculated by the command value calculator 17 and output.
  • the voltage amplitude and phase of the power system 26 are detected from the voltage detection value S3 by the amplitude phase calculator 27, and the phase detected by the amplitude phase calculator 27 is used as a reference. Then, the dq component calculator 28 decomposes the detected current value S2 into an in-phase component (active current component) and a 90 ° advanced phase component (reactive current component), and the DC voltage controller 14 determines the capacitor voltage command value S1 * and The active current command value S2 * d is calculated using the difference from the detected capacitor voltage value S1 as an input.
  • the voltage command value S3 * is calculated by the AC current controller 15 with the current command value S2 * and the current detection value S2 calculated by the DC voltage controller 14 as inputs, and the voltage command value calculated by the AC current controller 15
  • the semiconductor switching element drive signal S5 is calculated by the pulse calculator 16 from S3 * .
  • the configuration of the two-level power converter is illustrated.
  • the configuration is not limited to this, and the pulse calculator 16 is selected according to the configuration of an arbitrary power converter and the state of the semiconductor switching module 4 that configures the power converter. Shall calculate a suitable pulse.
  • the detected values may be estimated values calculated using other detected values, or may not be limited to feedback control.
  • the reactive current command value S2 * q is set to zero. However, if there is a power factor condition specification or other controlled object by reactive current, it may be an arbitrary value other than zero, which is effective for the present invention. Does not matter.
  • the capacitor voltage command value S1 * is detected from the state signal S4 of the semiconductor switching module 4 output from the failure detector 6 to determine whether or not the semiconductor switching module 4 constituting the phase has failed, and the failure to the total number of the semiconductor switching modules 4 occurs. According to the number of modules, the capacitor voltage command value S1 * is calculated, and an external signal S6 for the mechanism for reducing the voltage generated by the connected device is output.
  • the initial value of the capacitor voltage command value S1 * is S1 * ini
  • the total number of switching modules per phase is N all
  • the maximum number of failed modules in each phase is N
  • the semiconductor elements constituting the semiconductor switching module 4
  • ⁇ is a number equal to or less than 1
  • MIN is a function that selects the smaller value of the arguments.
  • the transformer 12 with a load tap switcher switches to a tap whose peak value of the AC line voltage does not exceed (N all -N) v / ⁇ 2 upon receipt of the external signal S6.
  • the semiconductor switching module 4 constituting the power converter 1 fails, the voltage applied to the healthy semiconductor switching module 4 can be reduced to a withstand voltage or lower, and chained. It is possible to obtain a power converter system that prevents failure and realizes continuous operation.
  • FIG. 3 and 4 show a second embodiment of the power conversion system of the present invention.
  • FIG. 3 shows a case where the rotating machine with the stator winding 20 of the rotating machine connected to the power converter 1 is a permanent magnet type or a wound type synchronous machine 18, and excitation in the case of the wound type synchronous machine 18. The apparatus is not shown.
  • FIG. 4 shows a case where the rotating machine in which the rotor winding 21 of the rotating machine is connected to the power converter 1 is a wound secondary excitation rotating machine 19.
  • the AC terminal of the power converter 1 is connected to the transformer 12 with a load tap changer, whereas in this embodiment, the AC terminal of the power converter 1 is connected. Is connected to a permanent magnet type or a winding type synchronous machine 18 or a winding type secondary excitation rotating machine 19, and hereinafter, a permanent magnet type or a winding type synchronous machine 18 and a winding type secondary excitation rotation. The part which concerns on the machine 19 is demonstrated.
  • the induced voltage characteristics with respect to the number of rotations vary depending on the type of rotating machine. That is, in the case of the permanent magnet type or winding type synchronous machine 18 shown in FIG. 3, since the time change rate of the magnetic flux interlinked with the stator winding 20 of the rotating machine is determined by the rotational speed, as shown in FIG. The rotational speed and the induced voltage have a substantially linear relationship.
  • the rotation speed control mechanism 22 is a permanent magnet type or winding type synchronous machine 18 detected by the external signal S6 output from the control device 11 of the power converter 1 and the rotation speed detector 25, or winding type secondary excitation.
  • the rotational speed of the rotating machine 19 is received, and the rotational speed range is limited based on the induced voltage characteristics shown in FIGS.
  • the rotation speed In the case of the permanent magnet type or the winding type synchronous machine 18, in order to lower the induced voltage below a predetermined voltage, the rotation speed is limited to a low speed region.
  • the rotational speed is limited to a region near the synchronous rotational speed.
  • the above-described rotation speed control mechanism 22 is, for example, a windmill controller in the case of a wind power generation system, and controls the rotation speed of the rotating machine by controlling the pitch angle of the blade that controls the windmill rotation speed with respect to the wind speed. To do. Moreover, if it is a hydroelectric power generation system, it is a turbine controller, and the rotation speed of a rotating machine is controlled by controlling the guide vane, the runner vane, etc. which control the rotation speed of the turbine with respect to the inflow of water.
  • FIG. 7 shows a third embodiment of the power conversion system of the present invention.
  • a second rotating machine 24 is provided in place of the on-load tap changer transformer 12 of the embodiment 2, and a permanent magnet type or winding type synchronous machine 18 or a winding type secondary excitation rotating machine 19 is provided.
  • the first rotating machine 23 is configured.
  • the first rotating machine 23 and the second rotating machine 24 are both winding-type rotating machines, and the first rotating machine 23 and the first rotating machine 24 rotate coaxially. It is shown.
  • FIG. 8 shows the relationship between the induced voltage applied to the power converter 1 and the rotation speed when the first rotating machine 23 and the second rotating machine 24 of the present embodiment are wound-type rotating machines.
  • the first rotating machine 23 and the second rotating machine 24 it is necessary to limit to a rotation speed region in which each induced voltage is simultaneously equal to or lower than a predetermined voltage.
  • the first rotating machine 23 and the second rotating machine 24 are a permanent magnet type rotating machine and a winding type rotating machine, respectively, it may be limited to the rotation speed region shown in FIG.
  • a predetermined voltage is obtained by voltage control in a system that controls DC voltage instead of voltage control of the smoothing capacitor 7 in the first embodiment.
  • the voltage applied to the power converter 1 is controlled to a predetermined voltage or less according to the failure state of the power converter 1.
  • the present invention can also be applied to the case where the operation is continued without causing the semiconductor switching modules 4 to fail in a chain.
  • this invention is not limited to the above-mentioned Example, Various modifications are included.
  • the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described.
  • a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment.
  • SYMBOLS 1 Power converter, 2 ... Self-extinguishing type semiconductor switching element, 3 ... Diode element, 4 ... Semiconductor switching module, 5 ... Short circuit device, 6 ... Fault detector, 7 ... Smoothing capacitor, 8 ... Capacitor voltage detector, DESCRIPTION OF SYMBOLS 9 ... Current detector, 10 ... Voltage detector, 11 ... Control device, 12 ... Transformer with load tap changer, 13 ... Connection point, 14 ... DC voltage controller, 15 ... AC current controller, 16 ... Pulse calculator, 17 ... Capacitor voltage command value calculator, 18 ... Winding type synchronous machine, 19 ... Winding type secondary excitation rotating machine, 20 ...
  • Stator winding of rotating machine 21 ... Rotor winding of rotating machine , 22 ... rotational speed control mechanism, 23 ... first rotating machine, 24 ... second rotating machine, 25 ... rotational speed detector, 26 ... power system, 27 ... amplitude phase calculator, 28 ... dq component calculator, S1: Capacitor voltage detection value, S1 *: Con Sensor voltage command value, S2 ... current detection value, S2 * ... current command value, S3 ... voltage detection value, S3 * ... voltage command value, S4 ... status signal of semiconductor switching module, S5 ... semiconductor switching element drive signal, S6 ... External signal.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

La présente invention se rapporte à un système de conversion de puissance qui peut réduire la tension appliquée à un convertisseur de puissance même lorsqu'un module qui compose le convertisseur de puissance tombe en panne. Ce système de conversion de puissance comprend : un module de commutation composé d'un élément de commutation à semi-conducteur et d'un élément redresseur raccordé en parallèle inverse à l'élément de commutation à semi-conducteur ; un détecteur de panne destiné à détecter une panne du module de commutation ; et un convertisseur de puissance raccordé en série à de multiples circuits comprenant un dispositif de court-circuit destiné à court-circuiter électriquement un module de commutation dans lequel une panne a été détectée par le détecteur de panne. Le système comprend : un moyen de détection de tension d'unité à courant continu destiné à détecter la tension d'unité à courant continu du convertisseur de puissance ; un moyen de réduction de tension d'unité à courant alternatif destiné à réduire la tension d'unité à courant alternatif du convertisseur de puissance ; et un dispositif de commande destiné à réduire la valeur de régulation de tension de la tension d'unité à courant continu du convertisseur de puissance lorsque le détecteur de panne signale une panne du module de commutation, à réduire la tension continue à un niveau plus bas que pendant un fonctionnement normal, et à transmettre un signal de fonctionnement au moyen de réduction de tension d'unité à courant alternatif.
PCT/JP2013/057223 2013-03-14 2013-03-14 Système de conversion de puissance et procédé de commande de ce dernier WO2014141436A1 (fr)

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PCT/JP2013/057223 WO2014141436A1 (fr) 2013-03-14 2013-03-14 Système de conversion de puissance et procédé de commande de ce dernier
JP2015505167A JP5855790B2 (ja) 2013-03-14 2013-03-14 電力変換システム及びその制御方法
TW102146372A TWI505625B (zh) 2013-03-14 2013-12-16 Power conversion system and its control method

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PCT/JP2013/057223 WO2014141436A1 (fr) 2013-03-14 2013-03-14 Système de conversion de puissance et procédé de commande de ce dernier

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113196641A (zh) * 2019-11-29 2021-07-30 华为技术有限公司 电压调节模块、充电模组和充电桩

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7083687B2 (ja) * 2018-04-18 2022-06-13 株式会社日立製作所 電力変換装置及び電力変換制方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000175435A (ja) * 1998-12-09 2000-06-23 Hitachi Ltd 電力変換装置
JP2001238460A (ja) * 2000-02-24 2001-08-31 Hitachi Ltd 電力変換装置

Family Cites Families (2)

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Publication number Priority date Publication date Assignee Title
DE102005045091B4 (de) * 2005-09-21 2007-08-30 Siemens Ag Steuerverfahren zur Redundanznutzung im Störungsfall eines mehrphasigen Stromrichters mit verteilten Energiespeichern
JP4872485B2 (ja) * 2006-06-28 2012-02-08 株式会社日立製作所 半導体電力変換装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000175435A (ja) * 1998-12-09 2000-06-23 Hitachi Ltd 電力変換装置
JP2001238460A (ja) * 2000-02-24 2001-08-31 Hitachi Ltd 電力変換装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113196641A (zh) * 2019-11-29 2021-07-30 华为技术有限公司 电压调节模块、充电模组和充电桩
CN113196641B (zh) * 2019-11-29 2023-09-12 华为数字能源技术有限公司 电压调节模块、充电模组和充电桩

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JP5855790B2 (ja) 2016-02-09

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