WO2013064310A1 - Inverter circuit and method for operating such an inverter circuit - Google Patents

Inverter circuit and method for operating such an inverter circuit Download PDF

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Publication number
WO2013064310A1
WO2013064310A1 PCT/EP2012/068756 EP2012068756W WO2013064310A1 WO 2013064310 A1 WO2013064310 A1 WO 2013064310A1 EP 2012068756 W EP2012068756 W EP 2012068756W WO 2013064310 A1 WO2013064310 A1 WO 2013064310A1
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WO
WIPO (PCT)
Prior art keywords
switch
converter system
inductance
connected
element
Prior art date
Application number
PCT/EP2012/068756
Other languages
German (de)
French (fr)
Inventor
Peter Steimer
Oscar Apeldoorn
Original Assignee
Abb Technology Ag
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
Priority to EP11187655.3 priority Critical
Priority to EP11187655 priority
Application filed by Abb Technology Ag filed Critical Abb Technology Ag
Publication of WO2013064310A1 publication Critical patent/WO2013064310A1/en

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M7/00Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48Conversion 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
    • H02M7/483Converters with outputs that each can have more than two voltages levels
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M1/00Details of apparatus for conversion
    • H02M1/32Means for protecting converters other than automatic disconnection
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M1/00Details of apparatus for conversion
    • H02M1/32Means for protecting converters other than automatic disconnection
    • H02M2001/325Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M7/00Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48Conversion 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
    • H02M7/483Converters with outputs that each can have more than two voltages levels
    • H02M2007/4835Converters with outputs that each can have more than two voltages levels comprising a plurality of cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, the capacitors being selectively connected in series to determine the instantaneous output voltage

Abstract

The invention relates to an inverter circuit having at least two phase modules (1), wherein each phase module (1) has a first and a second partial inverter system (2, 3), each partial inverter system (2, 3) comprises an inductance (L1, L2) and n two-pole switch cells (4) connected in series thereto, n >= 2 and each switch cell (4) has bidirectional power semiconductor switches, which can be actuated, having a controlled, unidirectional current conducting direction and a capacitive energy store. For each phase module (1), the inductance (L1) of the first partial inverter system (2) is serially connected to the inductance (L2) of the second partial inverter system (3). Furthermore, the connection point of the inductance (L1) of the first partial inverter system (2) forms a phase connection (K1, K2, K3) with the inductance (L2) of the second partial inverter system (3) for each phase module (1). A short-circuit element (S1) is connected, in parallel to each switch cell (4), to the connection poles (A1, A2) of the switch cell (4) in order to contain a fault current in a partial inverter system (2, 3), wherein an interrupting element (S2) is furthermore serially connected in a connection between the associated short-circuit element (S1) and the switch cell (4) in every switch cell (4).

Description

 Converter circuit and method for operating such a converter circuit

DESCRIPTION

Technical area

The invention relates to the field of power electronics. It is based on a converter circuit and a method for operating such a converter circuit according to the preamble of the independent claims.

Background Art Inverter circuits are used today in a variety of applications. One in the

Voltage particularly easy to scale converter circuit is specified in DE 102005040543A1. The converter circuit of DE 102005040543A1 comprises at least two phase components, each phase component having a first and a second partial converter system. Each sub-converter system comprises an inductance and series-connected n series-connected two-pole switching cells, where n> 2 and each switching cell has controllable bidirectional power semiconductor switches with controlled unidirectional current carrying direction and a capacitive energy storage. For each phase component, the inductance of the first partial converter system is connected in series with the inductance of the second partial converter system. Furthermore, for each phase component, the connection point of the inductance of the first partial converter system with the inductance the second subcircuit system a phase connection. Typically, an AC electrical network or load is connected to the phase terminals.

In the event of a fault in a subcircuit system of a phase module, the resulting fault current typically flows through the affected phase terminal from or into the AC electrical network or from or to the electrical load before disconnecting the inverter circuit at the phase terminals. Until this separation takes place, the converter circuit, in particular the components of the converter circuit, can be damaged, so that the converter circuit must be repaired or serviced and the availability of the converter circuit decreases.

In WO 2009/115125 A1 and in EP 2 369 725 A1 generic converter circuits are given. In addition, US 2007/268482 A1 discloses a power cell 64 of a power supply 60 in Figs. 6 and 9 and in sections [0037] and [0045], each power cell comprising a bypass switch 86 having a first switch 94 and a first switch 94 second switch 96 has. According to section [0045], in the event of a desired interruption of the power flow from a power cell 64, the switch 94 is opened and the switch 96 is closed. A concept for treating a fault in the power supply 60 is not disclosed in US 2007/268482 A1.

Presentation of the invention

The object of the invention is therefore to specify a converter circuit and a method for operating such a converter circuit, so that improved control of a fault current occurring in the event of a fault in a partial converter system of a phase component of the converter circuit is possible.

This object is solved by the features of claim 1 and claim 12. In the dependent claims advantageous developments of the invention are given.

The inventive converter circuit comprises at least two phase components, each phase component having a first and a second partial converter system. Each partial converter system comprises an inductance and n series-connected bipolar switching cells, where n> 2, and each switch cell has controllable bidirectional power semiconductor switches with controlled unidirectional current-carrying direction and a capacitive energy store. For Each phase component, the inductance of the first partial converter system is connected in series with the inductance of the second partial converter system. Furthermore, the connection point of the inductance of the first partial converter system with the inductance of the second partial converter system forms a phase connection for each phase component.

According to the invention, a short-circuit element is now connected in parallel to each switching cell at the terminal poles of the switching cell, and in addition, a break element is connected in series with each switching cell in a connection between the associated short-circuit element and the switching cell. The respective short-circuit element is used for galvanic connection, i. the short circuit of the associated switching cell in the event of a fault current occurring due to an error in a Teilumrichtersystem a phase block. So that no fault current can flow through the switching cell during short-circuiting of the switching cell, the interruption element is advantageously connected in a connection between the associated short-circuit element and the switching cell, which is then opened. In the event of a fault in a partial converter system, the associated short-circuit element is therefore generally closed in at least one switching cell of this partial converter system and the interruption element is opened. The interruption element thus makes it possible to interrupt a fault current, which flows in particular in the direction of the switching cell, quickly and safely. Preferably, the shorting element is first closed and then the interruption element is opened.

As already mentioned above, in the event of a fault in a partial converter system, the associated short-circuit element is generally closed and the interruption element is opened in general in the case of at least one switching cell of this partial converter system. Preferably, the shorting element is first closed and then the interruption element is opened. In a preferred embodiment of the invention, in the event of a fault in a partial converter system, the associated short-circuit element is additionally closed and the interruption element is opened in the event of at least one switching cell of the further partial converter system. Upon occurrence of said error is further preferably after closing the short-circuit element and after opening the interruption element connected to the phase terminals circuit breaker open, so that the converter circuit can be advantageously separated easily and quickly at the phase terminals.

The short-circuit element together with the interruption element thus make it possible to keep any occurring fault current from a switching cell, several or all switching cells of a Teilumrichtersys- tems or more or all Teilumrichtersystemen before the converter circuit on the phase terminals is separated. Thus, a fault current occurring in the event of a fault in a partial converter system of a phase module can be controlled very easily before the converter circuit is disconnected at the phase connections. These and other objects, advantages and features of the present invention will become more apparent from the following detailed description of preferred embodiments of the invention taken in conjunction with the accompanying drawings.

Brief description of the drawings

Show it:

 1 shows a first embodiment of a converter circuit according to the invention, FIG. 2 shows a second embodiment of a converter circuit according to the invention,

3 shows a first embodiment of a switching cell of the converter circuit according to the invention, FIG. 4 shows a second embodiment of a switching cell of the converter circuit according to the invention,

Fig. 5 shows a first embodiment of an interruption element of the inventive

 Converter circuit and

Fig. 6 shows a second embodiment of an interruption element of the inventive converter circuit

The reference symbols used in the drawing and their meaning are listed in the list of reference numbers. Basically, the same parts are provided with the same reference numerals in the figures. The described embodiments are exemplary of the subject invention and have no limiting effect. Ways to carry out the invention

1 shows a first embodiment of a converter circuit according to the invention, in particular designed with three phases U, V, W. 2 shows a second embodiment of the converter circuit according to the invention, likewise embodied by way of example with three phases U, V, W. Generally, the converter circuit comprises at least two phase modules 1, each phase module 1 having a first and a second partial converter system 2, 3. Each sub-converter system 2, 3 further comprises an inductance L1, L2 and series-connected n series-connected two-pole switching cells 4, where n> 2 and each switching cell has 4 controllable bidirectional power semiconductor switches with controlled unidirectional current carrying direction and a capacitive energy storage. The respective controllable bidirectional power semiconductor switch with controlled unidirectional current-carrying direction of the switching cells 4 of the partial converter systems 2, 3 is in particular as a turn-off thyristor (GTO) or as an integrated thyristor with a commutated gate drive (IGCT) with one each formed antiparallel connected diode. However, it is also conceivable to form a controllable bidirectional power semiconductor switch with controlled unidirectional current-carrying direction, for example as a power MOSFET with additionally antiparallel-connected diode or as a bipolar transistor with insulated gate electrode (IGBT) with additionally antiparallel connected diode. In Fig. 3 a first embodiment of a switching cell of the inventive converter circuit is shown by way of example, wherein the controllable bidirectional power semiconductor switches are connected with controlled unidirectional current carrying direction in half-bridge circuit and the capacitive energy storage is connected in parallel to the half-bridge circuit. Furthermore, a second embodiment of a switching cell of the converter circuit according to the invention is shown by way of example in FIG. 4, wherein the controllable bidirectional power semiconductor switches with controlled unidirectional current-carrying direction are connected in full-bridge circuit and the capacitive energy store is connected in parallel with the full-bridge circuit. The phase components 1 are connected in parallel to one another, as shown by way of example in FIGS. 2 and 3.

For each phase module 1, the inductance L1 of the first partial converter system 2 is connected in series with the inductance L2 of the second partial converter system 3. Furthermore, for each phase module 1, the connection point of the inductance L1 of the first partial converter system 2 with the inductance L2 of the second partial converter system 3 forms a phase connection K1, K2, K3.

According to the invention, a short-circuit element S1 is now connected in parallel to each switching cell 4 at the connecting poles A1, A2 of the switching cell 4, and moreover, in each switching cell 4, it is connected between the associated short-circuit element S1 and the switching cell 4, a break element S2 connected in series. The respective short-circuit element S1 is used for the galvanic connection, ie the short circuit of the associated switching cell 4 in the event of a fault current occurring due to an error in a partial converter system 2, 3 of a phase module. 1 Thus, the short circuit of the switching cell 4 no leakage current can flow through the switching cell 4, the interruption element S2 is advantageously connected in a connection between the associated short-circuit element S1 and the switching cell 4, which is then opened. In the case of a fault in a partial converter system 2, 3, the associated short-circuit element S1 is thus generally closed in at least one switching cell 4 of this partial converter system S1, which thus assumes the fault current, and the interruption element S2 is opened, the switching cell 4 connected to the respective interrupting element S2 can help that the remaining current, which still flows through the respective interruption element S2, can be reduced. Preferably, the short-circuit element S1 is first closed and then the interruption element S2 is opened. After separation of the converter circuit at the phase terminals K1, K2, K3 then the respective short-circuit element S1 is opened again. In Fig. 1 and Fig. 2, the possibilities of the serial connection of the respective interruption element S2 in the connection between each of the associated short-circuit element S1 and the switching cell 4 are exemplified, of course, a combination would be conceivable. As a result, the interruption element S2 makes it possible to quickly and surely interrupt a fault current. In a preferred manner, in the event of a fault in a partial converter system 2, 3, the associated short-circuit element S1 is also closed in the process and additionally the interruption element S2 is opened in the event of at least one switching cell 4 of the further partial converter system 2, 3. The short-circuit element S1 together with the interruption element S2 thus makes it possible to keep an occurring fault current from one switching cell 4, several or all switching cells 4 of a partial converter system 2, 3 or more or all partial converter systems 2, 3, before the converter circuit at the phase terminals K1, K2, K3 is separated. A fault current occurring in the event of a fault in a partial converter system 2, 3 of a phase module 1 can therefore be controlled very easily before the converter circuit is disconnected at the phase terminals K1, K2, K3. If no fault current occurs in a partial converter system 2, 3 of a phase module 1, the respective short-circuit element S1 is opened and the respective interrupt element S2 is closed.

Furthermore, the respective interruption element S2 is formed by a controllable switch with bidirectional current-carrying direction, so that advantageously fault currents of different polarity can be interrupted. The controllable switch with bidirectional current-carrying direction of the interruption element S2 can be designed as a mechanical switch. As shown by way of example in FIG. 5, the controllable switch with bidirectional current-carrying direction of the interruption element S2 can also be formed by two controllable bidirectional power semiconductor switches connected in antiparallel with a controlled unidirectional current-carrying direction. The respective controllable bidirectional power semiconductor switch with controlled unidirectional current-carrying direction, in turn, may comprise a bipolar transistor with a gate electrode arranged isolated and an antiparallel-connected diode with respect to the bipolar transistor. Alternatively, it is also conceivable that the respective controllable bidirectional power semiconductor switch has a power MOSFET with diode connected in antiparallel to it. As shown by way of example in FIG. 6, as a further alternative it is also possible that the respective controllable bidirectional power semiconductor switch with controlled unidirectional current-carrying direction has a reverse-blocking thyristor. Therein, any types of thyristors known to the person skilled in the art are conceivable, in particular also integrated thyristors with commutated drive electrode (IGCT - Integrated Gate Commutated Thyristor). Preferably, the thyristors to be used are designed as symmetrical thyristors. Since only thyristors are used, this embodiment of the interruption element S2 is conceivably simple, thus very robust and extremely cost-effective to implement. Preferably, the short-circuit element S1 is formed by a controllable switch with bidirectional current-carrying direction. The controllable switch with bidirectional current-carrying direction of the short-circuit element S1 is preferably designed as a mechanical switch. Such a mechanical switch triggers sufficiently quickly and provides a reliable galvanic connection between the terminal poles A1, A2 of the associated switching cell 4. As an alternative to the mechanical switch, it is also conceivable that the respective controllable switch with bidirectional

Current direction of the short-circuit element S1 is formed by two antiparallel connected controllable power semiconductor switch, as shown in Fig. 1 and Fig. 2 by way of example. As a respective controllable power semiconductor switch, for example, a turn-off thyristor (GTO - gate turn-off thyristor) or an integrated thyristor with commutated drive electrode (IGCT - Integrated Gate Commutated Thyristor) is conceivable. Preferably, the thyristors to be used are designed as symmetrical thyristors. However, it is also conceivable to form the respective controllable power semiconductor switch, for example as a power MOSFET or as a bipolar transistor with a gate electrode arranged in isolated fashion (IGBT). For disconnecting the converter circuit at the phase terminals K1, K2, K3 from an electrical AC voltage network typically connected to the phase terminals or from a connected electrical load, a circuit breaker 6 is connected to the phase terminals K1, K2, K3. The circuit breaker 6 is preferably designed as a mechanical switch.

The circuit breaker 6 is opened in the event of a fault current already mentioned above due to an error in a partial converter system 2, 3 of a phase module 1 after closing the short-circuit element S1 and after opening the interruption element S2, so that the converter circuit at the phase terminals K1, K2, K3 is easily and quickly separated with advantage.

LIST OF REFERENCE NUMBERS

1 phase block

 2 first sub-converter system 3 second sub-converter system

4 switching cell

 5 circuit breakers

 51 short-circuit element

52 interruption element A1. A2 connecting poles

 K1, K2, K3 phase connections

Claims

Converter circuit having at least two phase components (1), each phase component (1) having a first and a second partial converter system (2, 3), each partial converter system (2, 3) an inductance (L1, L2) and series-connected n in series comprises switched bipolar switching cell (4), n> 2 and each switching cell (4) controllable bidirectional power semiconductor switch with controlled unidirectional current carrying direction and a capacitive energy storage, wherein for each phase module (1) the inductance (L1) of the first partial converter system (2) serially is connected to the inductance (L2) of the second partial converter system (3), and wherein for each phase component (1) the connection point of the inductance (L1) of the first part converter system (2) with the inductance (L2) of the second partial converter system (3) Phase connection (K1, K2, K3) forms,
characterized,
in that parallel to each switching cell (4), a short-circuit element (S1) is connected to the connecting poles (A1, A2) of the switching cell (4), and
a break element (S2) is connected in series in a connection between the associated short-circuit element (S1) and the switch cell (4), whereby in the case of a fault in a partial converter system (2, 3) at least one switch cell (4 ) of this partial converter system (2, 3), the associated short-circuit element (S1) is closed and the interruption element (S2) is opened.
Converter circuit according to claim 1, characterized in that the respective interruption element (S2) is formed by a controllable switch with bidirectional current-carrying direction.
Converter circuit according to claim 2, characterized in that the controllable switch with bidirectional current-carrying direction of the interruption element (S2) by two antiparallel connected controllable bidirectional power semiconductor switch is formed with controlled unidirectional current-carrying direction.
Converter circuit according to claim 3, characterized in that the respective controllable bidirectional power semiconductor switch with controlled unidirectional current carrying direction comprises a bipolar transistor with insulated gate electrode arranged and to the bipolar transistor has an antiparallel connected diode, or the respective controllable bidirectional power semiconductor switch has a power MOSFET with diode connected in antiparallel to it.
5. converter circuit according to claim 3, characterized in that the respective controllable bidirectional power semiconductor switch having a controlled unidirectional current carrying direction has a reverse blocking thyristor.
6. converter circuit according to claim 2, characterized in that the controllable switch with bidirectional current-carrying direction of the interruption element (S2) is designed as a mechanical switch.
7. converter circuit according to one of claims 1 to 6, characterized in that the short-circuit element (S1) is formed by a controllable switch with bidirectional current-carrying direction.
8. converter circuit according to claim 7, characterized in that the controllable switch with bidirectional current-carrying direction of the short-circuit element (S1) is designed as a mechanical switch.
9. converter circuit according to claim 7, characterized in that the controllable switch with bidirectional current-carrying direction of the short-circuit element (S1) by two antiparallel connected controllable power semiconductor switch is formed.
10. converter circuit according to one of claims 1 to 9, characterized in that a power switch (6) with the phase terminals (K1, K2, K3) is connected.
1 1. converter circuit according to claim 10, characterized in that the power switch (6) is designed as a mechanical switch.
12. A method for operating a converter circuit having at least two phase components (1), each phase component (1) having a first and a second partial converter system (2, 3), each partial converter system (2, 3) an inductance (L1, L2) and thereto n is 2 and each switch cell (4) has controllable bidirectional power semiconductor switches with controlled unidirectional current carrying direction and a capacitive energy store, wherein for each phase component (1) the inductance vity (L1) of the first partial converter system (2) is connected in series with the inductance (L2) of the second partial converter system (3), and wherein for each phase component (1) the connection point of the inductance (L1) of the first partial converter system (2) with the inductance (L2) of the second partial converter system (3) forms a phase connection (K1, K2, K3),
 characterized,
 a short-circuit element (S1) is connected in parallel with each switching cell (4) at the connecting poles (A1, A2) of the switching cell (4), in each switching cell (4) into a connection between the associated short-circuit element (S1) and the switching cell (4 ) an interruption element (S2) is connected in series and in the event of a fault in a partial converter system (2, 3) in at least one switching cell (4) of this partial converter system (2, 3) the associated short-circuit element
(51) is closed and the interruption element (S2) is opened.
13. The method according to claim 12, characterized in that in the event of a fault in a partial converter system (2, 3), in at least one switching cell (4) of the further partial converter system (2, 3), the associated short-circuit element (S1) is closed and the Interruption element (S2) is opened.
14. The method according to claim 12 or 13, characterized in that first the short-circuit element (S1) is closed and then the interruption element (S2) is opened.
15. The method according to any one of claims 12 to14, characterized in that a circuit breaker (6) with the phase terminals (K1, K2, K3) is connected and the power switch (6) after closing of the short-circuit element (S1) and after opening of the interruption element
(52) is opened.
PCT/EP2012/068756 2011-11-03 2012-09-24 Inverter circuit and method for operating such an inverter circuit WO2013064310A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP11187655.3 2011-11-03
EP11187655 2011-11-03

Publications (1)

Publication Number Publication Date
WO2013064310A1 true WO2013064310A1 (en) 2013-05-10

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Application Number Title Priority Date Filing Date
PCT/EP2012/068756 WO2013064310A1 (en) 2011-11-03 2012-09-24 Inverter circuit and method for operating such an inverter circuit

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Country Link
WO (1) WO2013064310A1 (en)

Cited By (5)

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Publication number Priority date Publication date Assignee Title
EP3001552A1 (en) * 2014-09-23 2016-03-30 Alstom Technology Ltd Voltage source converter and control thereof
EP3068008A1 (en) * 2015-03-12 2016-09-14 General Electric Technology GmbH Improvements in or relating to hvdc power converters
EP3116118A4 (en) * 2014-03-05 2018-03-28 Mitsubishi Electric Corporation Power conversion device
EP3206288A4 (en) * 2014-10-08 2018-05-16 Mitsubishi Electric Corporation Power conversion device
CN108242884A (en) * 2016-12-23 2018-07-03 北京天诚同创电气有限公司 Photovoltaic inverter system grid-connected single channel MPPT and its short-circuit protection method

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US20100314937A1 (en) * 2009-06-11 2010-12-16 Jacobson Boris S Reconfigurable multi-cell power converter
EP2369725A1 (en) 2010-03-25 2011-09-28 ABB Schweiz AG Short circuiting unit

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DE102005040543A1 (en) 2005-08-26 2007-03-01 Siemens Ag Converter circuit with distributed energy storage
US20070268482A1 (en) 2006-05-19 2007-11-22 Siemens Energy & Automation, Inc. Method for optically detecting an electrical arc in a power supply
US20080088186A1 (en) * 2006-09-28 2008-04-17 Siemens Energy And Automation, Inc. Integrated power cell bypass assembly and power supply including same
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3116118A4 (en) * 2014-03-05 2018-03-28 Mitsubishi Electric Corporation Power conversion device
EP3001552A1 (en) * 2014-09-23 2016-03-30 Alstom Technology Ltd Voltage source converter and control thereof
EP3206288A4 (en) * 2014-10-08 2018-05-16 Mitsubishi Electric Corporation Power conversion device
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EP3068008A1 (en) * 2015-03-12 2016-09-14 General Electric Technology GmbH Improvements in or relating to hvdc power converters
CN108242884A (en) * 2016-12-23 2018-07-03 北京天诚同创电气有限公司 Photovoltaic inverter system grid-connected single channel MPPT and its short-circuit protection method
CN108242884B (en) * 2016-12-23 2020-03-10 北京天诚同创电气有限公司 Photovoltaic inverter system for one-way MPPT grid connection and short-circuit protection method thereof

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