WO2016203516A1 - 電力変換装置 - Google Patents
電力変換装置 Download PDFInfo
- Publication number
- WO2016203516A1 WO2016203516A1 PCT/JP2015/067155 JP2015067155W WO2016203516A1 WO 2016203516 A1 WO2016203516 A1 WO 2016203516A1 JP 2015067155 W JP2015067155 W JP 2015067155W WO 2016203516 A1 WO2016203516 A1 WO 2016203516A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- voltage
- cell
- circuit
- control device
- control
- Prior art date
Links
Images
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
- H02M7/42—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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static 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
- 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
- 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
-
- 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
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
- H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
- H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with 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
- H02M7/797—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with 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
Definitions
- the present invention relates to a power conversion device, and more particularly to a power conversion device including an arm configured by connecting one or a plurality of unit converters in series.
- the MMC has an arm configured by connecting a plurality of unit converters in series.
- the unit converter includes a switching element and a DC capacitor.
- the unit converter outputs the voltage of the DC capacitor to the output terminal by switching the switching element.
- a semiconductor switching element capable of on / off control such as an IGBT (Insulated Gate Bipolar Transistor), is generally used.
- each unit converter is protected from an overvoltage by setting each unit converter in a state in which the switching element is fixed in the off state.
- the present invention has been made to solve the above-described problems, and an object of the present invention is a power conversion device including an arm configured by connecting one or a plurality of unit converters in series. It is to realize protection of each unit converter even when communication abnormality occurs between the control device and the unit converter.
- a power conversion device includes a power converter and a control device that controls the power converter.
- the power converter includes an arm configured by connecting one or more unit converters in series.
- the unit converter includes a main circuit, a control circuit, and a switch.
- the main circuit includes a switching element and a DC capacitor, and outputs a voltage pulse corresponding to the voltage of the DC capacitor when the switching element is turned on and off.
- the control circuit is configured to transmit the voltage detection value of the DC capacitor to the control device and to control the on / off of the switching element according to the control signal received from the control device.
- the switch is configured to be able to short-circuit the output terminal of the main circuit by being turned on in response to an on command from the control circuit.
- the control device compares the plurality of voltage detection values respectively received from the plurality of unit converters with the first threshold voltage, and if at least one voltage detection value exceeds the first threshold voltage, A control signal for fixing the switching element to the OFF state is transmitted to the control circuit of the unit converter.
- the control circuit compares its own voltage detection value with a second threshold voltage higher than the first threshold voltage, and if the voltage detection value exceeds the second threshold voltage, The switching element of its own main circuit is autonomously fixed to the off state regardless of the control signal, and the switch is turned on.
- each unit conversion is performed even when a communication abnormality occurs between the control device and the unit converter. Protection of the vessel can be realized.
- FIG. 1 is an overall configuration diagram of a power conversion device according to an embodiment of the present invention. It is a figure which shows the structural example of the cell shown in FIG. It is a block diagram which shows the control structure for implement
- FIG. 1 is an overall configuration diagram of a power conversion device according to an embodiment of the present invention.
- power conversion device 100 includes a modular multilevel converter (MMC) 110 and a control device 120 that controls MMC 110.
- MMC modular multilevel converter
- the MMC 110 includes a positive voltage terminal 3a, a negative voltage terminal 3b, and three AC terminals 3c to 3e.
- the MMC 110 is a bidirectional power conversion device that converts one of DC power and three-phase AC power into the other power.
- the positive voltage terminal 3a and the negative voltage terminal 3b are used for transferring DC power.
- Three AC terminals 3c to 3e are used for transmitting and receiving three-phase AC power.
- the MMC 110 corresponds to an embodiment of a “power converter” in the present invention.
- the positive voltage terminal 3 a and the negative voltage terminal 3 b are connected to the load 4.
- a DC load, a DC power source, a motor drive inverter, or the like is applied as the load 4.
- the three AC terminals 3c to 3e are connected to the three secondary terminals of the three-phase transformer 2, respectively.
- the primary side terminal of the three-phase transformer 2 is connected to the three-phase transmission line of the AC power system 1 through a circuit breaker (not shown).
- the circuit breaker is in a conductive state during normal operation, and is in a non-conductive state when, for example, a short circuit accident occurs between the terminals 3a and 3b.
- the three-phase AC power of the AC power system 1 is supplied to the MMC 110 via the three-phase transformer 2.
- the MMC 110 converts three-phase AC power into DC power.
- the converted DC power is supplied to the load 4. That is, the MMC 110 operates as an AC-DC converter that converts AC power into DC power.
- the MMC 110 converts DC power into three-phase AC power.
- the converted three-phase AC power is supplied to the AC power system 1 via the three-phase transformer 2. That is, the MMC 110 operates as a DC-AC converter that converts DC power into AC power.
- the MMC 110 further includes arms A1 to A6 and reactors L1 to L6.
- One terminals of arms A1 to A3 are all connected to positive voltage terminal 3a, and the other terminals are connected to one terminals of reactors L1 to L3, respectively.
- the other terminals of reactors L1 to L3 are connected to AC terminals 3c to 3e, respectively.
- One terminal of each of the arms A4 to A6 is connected to the negative voltage terminal 3b, and the other terminal is connected to one terminal of each of the reactors L4 to L6.
- the other terminals of reactors L4 to L6 are connected to AC terminals 3c to 3e, respectively.
- a positive DC voltage VP is supplied from the MMC 110 and the load 4 to the positive voltage terminal 3a.
- a negative DC voltage VN is supplied from the MMC 110 and the load 4 to the negative voltage terminal 3b.
- the U-phase AC voltage VU is supplied from the three-phase transformer 2 and the MMC 110 to the AC terminal 3c.
- the AC terminal 3d is supplied with the V-phase AC voltage VV from the three-phase transformer 2 and the MMC 110.
- the AC terminal 3e is supplied with a W-phase AC voltage VW from the three-phase transformer 2 and the MMC 110.
- the phases of the three-phase AC voltages VU, VV, and VW are shifted by 120 degrees.
- Arms A1 and A4 constitute a U-phase module that performs bidirectional power conversion between U-phase AC voltage VU and DC voltages VP and VN.
- Arms A2 and A5 constitute a V-phase module that performs bidirectional power conversion between V-phase AC voltage VV and DC voltages VP and VN.
- Arms A3 and A6 constitute a W-phase module that performs bidirectional power conversion between W-phase AC voltage VW and DC voltages VP and VN.
- the inductances of reactors L1 to L6 control the current flowing through each arm A, and to a value necessary to suppress the circulating current flowing between the three phase modules when the amplitudes of AC voltages VU, VV, and VW are different. Is set.
- Each of the arms A1 to A6 includes a plurality of unit converters (hereinafter also referred to as cells) 10 connected in cascade.
- FIG. 2 is a diagram illustrating a configuration example of the cell 10 illustrated in FIG. 1.
- cell 10 includes a main circuit 30, a control circuit 32, and a power supply 50.
- the main circuit 30 is configured by a full bridge circuit including a DC capacitor. Specifically, the main circuit 30 is a two-terminal circuit having a first terminal 33 and a second terminal 34. Main circuit 30 includes switching elements Q1-Q4, diodes D1-D4, and a DC capacitor C1.
- Switching elements Q1 to Q4 are self-extinguishing power semiconductor elements, and are made of, for example, IGBTs.
- Switching elements Q1, Q2 are connected in series between a power line pair (positive line 36 and negative line 38).
- Switching elements Q3 and Q4 are connected in series between the power line pair.
- the collectors of switching elements Q1 and Q3 are both connected to positive line 36, and the emitters of switching elements Q2 and Q4 are both connected to negative line 38.
- a connection point between the emitter of the switching element Q 1 and the collector of the switching element Q 2 is connected to the first terminal 33.
- a connection point between the emitter of the switching element Q3 and the collector of the switching element Q4 is connected to the second terminal.
- the diodes D1 to D4 are connected in antiparallel to the switching elements Q1 to Q4, respectively.
- the DC capacitor C1 is connected between the positive electrode line 36 and the negative electrode line 38.
- the DC capacitor C1 smoothes the output of the full bridge circuit.
- the first terminals 33 of the cells 10 located at one end of the arms A1 to A3 are both connected to the positive voltage terminal 3a.
- the second terminal 34 of each cell 10 is connected to the first terminal 33 of the cell 10 adjacent to the AC terminals 3c to 3e.
- the second terminal 34 of the cell 10 located at the other end of the arms A1 to A3 is connected to one terminal of the reactors L1 to L3, respectively.
- the first terminal 33 of the cell 10 located at one end of the arms A4 to A6 is connected to one terminal of the reactors L4 to L6, respectively.
- the second terminal 34 of each cell 10 is connected to the first terminal 33 of the cell 10 adjacent to the negative voltage terminal 3b side.
- the second terminals 34 of the cells 10 located at the other ends of the arms A4 to A6 are all connected to the negative voltage terminal 3b.
- the switching elements Q1 and Q2 are turned on and off alternately.
- Switching elements Q3 and Q4 are turned on and off alternately.
- the cell voltage Vcell is controlled by the on / off states of the switching elements Q1 to Q4.
- the cell voltage Vcell is substantially equal to the voltage VC of the DC capacitor C1.
- the switching elements Q1 and Q2 are turned on and off, respectively, and the switching elements Q3 and Q4 are turned on and off, respectively, the cell voltage Vcell is substantially zero.
- switching elements Q1 and Q2 are turned off and on, respectively, and switching elements Q3 and Q4 are turned off and on, cell voltage Vcell is substantially zero.
- the cell voltage Vcell is substantially equal to a voltage obtained by inverting the polarity of the voltage VC of the DC capacitor C1.
- the cell voltage Vcell is determined depending on the polarity of the current flowing through the cell 10.
- the cell voltage Vcell is substantially equal to the voltage VC of the DC capacitor C1.
- the cell voltage Vcell is substantially equal to a voltage obtained by inverting the polarity of the voltage VC of the DC capacitor C1.
- the voltage between the two terminals of each arm A is represented by the sum of the cell voltages Vcell of the cells 10 included in this arm A. Therefore, the voltage of each arm A can be controlled by the on / off states of the switching elements Q1 to Q4 constituting the cell 10.
- the main circuit 30 further includes a switch SW.
- the switch SW is connected between the first terminal 33 and the second terminal 34.
- the switch SW is configured to be able to short-circuit the first terminal 33 and the second terminal 34 by being turned on (closed) in response to an on command (close command) from the control circuit 32. That is, the output of the cell 10 can be short-circuited by turning on the switch SW.
- the switch SW corresponds to an example of the “switch” in the present invention.
- the control circuit 32 includes gate drive circuits 40 and 42, a switch operation circuit 44, a voltage sensor 46, and an I / F (interface) circuit 48.
- the I / F circuit 48 communicates with the control device 120 via an optical fiber cable (not shown).
- the I / F circuit 48 receives a gate signal GC for controlling the full bridge circuit of the main circuit 30 from the control device 120.
- the I / F circuit 48 further receives from the control device 120 a gate cutoff signal GB for stopping (all off) the switching operations of the switching elements Q1 to Q4 constituting the full bridge circuit.
- the I / F circuit 48 outputs the received gate signal GC and gate cutoff signal GB to the gate drive circuits 40 and 42.
- the gate drive circuit 40 controls on / off of the switching elements Q1, Q2 in response to the gate signal GC. Alternatively, the gate drive circuit 40 sets the switching elements Q1 and Q2 to the off state (stopped state) in response to the gate cutoff signal GB.
- the gate drive circuit 42 controls on / off of the switching elements Q3, Q4 in response to the gate signal GC.
- the gate drive circuit 42 makes the switching elements Q3 and Q4 fixed in the off state in response to the gate cutoff signal GB.
- the switch operation circuit 44 is a circuit for operating on / off of the switch SW.
- the switch operation circuit 44 is configured to control energization to the excitation coil 52 provided so that the switch SW is turned off (opened) when no power is supplied in accordance with a command from the control device 120.
- the switch SW is turned off.
- the control device 120 detects an abnormality such as a short circuit failure of the switching element in any one of the plurality of cells 10
- the control device 120 issues an ON command for the switch SW to the failed cell 10.
- Output In the failed cell 10, the I / F circuit 48 receives the ON command and outputs it to the switch operation circuit 44.
- the switch operation circuit 44 supplies current to the exciting coil 52 in response to the ON command, so that the switch SW is turned ON. Thereby, the output of the failed cell 10 is short-circuited.
- the voltage sensor 46 detects the voltage VC of the DC capacitor C1 and outputs the detected value to the I / F circuit 48.
- the I / F circuit 48 transmits the voltage VC detected by the voltage sensor 46 to the control device 120.
- the power supply 50 is connected in parallel to the DC capacitor C1.
- the power supply 50 generates a power supply voltage to be supplied to the control circuit 32 by stepping down the voltage VC of the DC capacitor C1. That is, each cell 10 can supply power from the main circuit 30 to the control circuit 32, and forms a self-contained cell.
- the control device 120 controls power conversion in the main circuit 30 of each cell 10 by communicating with the control circuit 32 of each cell 10. At this time, the control device 120 controls the power conversion based on the detected value of the voltage VC of the DC capacitor C1 of each cell 10 to charge the DC capacitor C1 of each cell 10 to a predetermined DC voltage.
- the control device 120 employs, for example, PWM (Pulse Width Modulation) control as a control method of the switching elements Q1 to Q4 of each cell 10.
- the control device 120 receives the detection value of the voltage VC of the DC capacitor C1 from the I / F circuit 48 of each cell 10, and receives the detection value of the current flowing through the AC power system 1 from a current sensor (not shown). Based on the above, a gate signal GC for controlling the switching elements Q1 to Q4 of each cell 10 is generated by PWM control.
- PWM Pulse Width Modulation
- the control device 120 further detects the abnormality of the voltage VC by monitoring the detected value of the voltage VC of the DC capacitor C1 in each cell 10.
- the three-phase AC power supplied to the power conversion apparatus 100 may be shaken by the disturbance.
- the voltage VC of the DC capacitor C1 varies.
- the control of the switching elements Q1 to Q4 becomes unstable, so that an overvoltage exceeding the withstand voltage may be applied to the switching elements. As a result, the switching element may be damaged.
- the control device 120 detects an abnormality in the voltage VC of the DC capacitor C1 based on the detected value of the voltage VC transmitted from each cell 10. Specifically, for each cell 10, control device 120 compares the detected value of voltage VC with a preset threshold voltage DCOV1 (first threshold voltage). When it is determined that the voltage VC exceeds the threshold voltage DCOV1 in at least one cell 10, the control device 120 generates the gate cutoff signal GB toward all the cells 10 configuring the MMC 110. Thereby, in each cell 10 of the MMC 110, the main circuit 30 enters the gate cutoff state (stopped state) in response to the gate cutoff signal GB, so that the switching elements Q1 to Q4 can be protected from overvoltage.
- DCOV1 first threshold voltage
- a communication abnormality may occur between the control device 120 and the control circuits 32 of some cells 10 during communication between the control device 120 and the control circuit 32 of each cell 10.
- the control device 120 cannot normally compare the detected value of the voltage VC with the threshold voltage DCOV1, there is a possibility that it cannot detect that the voltage VC exceeds the threshold voltage DCOV1.
- each cell 10 is configured to detect an abnormality in voltage VC of its own DC capacitor C1 by self-diagnosis. Thereby, each cell 10 autonomously puts its main circuit 30 into the gate cutoff state regardless of the gate cutoff signal GB transmitted from the control device 120 when the abnormality of the voltage VC is detected. Can do.
- FIG. 3 is a block diagram showing a control configuration for realizing the abnormality detection of the voltage VC of the DC capacitor C1 in the control device 120 and each cell 10.
- control device 120 includes a plurality of comparators CP1 and an OR circuit OR1.
- the plurality of comparators CP1 are associated with the plurality of cells 10 included in the MMC 110 on a one-to-one basis.
- Each comparator CP1 receives the detected value of the voltage VC of the DC capacitor C1 by the voltage sensor 46 built in the control circuit 32 of the corresponding cell 10 at the non-inverting input terminal (+ terminal).
- the threshold voltage DCOV1 is input to the inverting input terminal ( ⁇ terminal).
- the comparator CP1 compares the detected value of the voltage VC with the threshold voltage DCOV1, and outputs a comparison result.
- the output signal of the comparator CP1 becomes H (logic high) level.
- the output signal of the comparator CP1 becomes L (logic low) level.
- the OR circuit OR1 When the OR circuit OR1 receives the output signals of the plurality of comparators CP1, the OR circuit OR1 outputs a logical sum of these output signals. The logical sum is transmitted to the control circuit 32 of each cell 10 as the gate cutoff signal GB.
- the gate cutoff signal GB When the output signal of at least one comparator CP1 is at H level, that is, when the detected value of voltage VC exceeds the threshold voltage DCOV1 in at least one cell 10, the gate cutoff signal GB is activated to H level.
- the output signals of the plurality of comparators CP1 are all at the L level, that is, when the detected value of the voltage VC is equal to or lower than the threshold voltage DCOV1 in all the cells 10, the gate cutoff signal GB is deactivated to the L level.
- the gate drive circuit 42 receives the gate cutoff signal GB via the I / F circuit 48.
- the gate cutoff signal GB is activated to the H level, the gate drive circuits 40 and 42 put the main circuit 30 in the gate cutoff state.
- the control device 120 when it is determined that the detected value of the voltage VC of the DC capacitor C1 exceeds the threshold voltage DCOV1 in any of the plurality of cells 10 constituting the MMC 110, By outputting the gate cutoff signal GB activated to the H level toward the control circuit 32 of the cell 10, all the cells 10 can be in the gate cutoff state.
- control circuit 32 of each cell 10 includes a comparator CP2.
- the comparator CP2 is provided in an I / F circuit 48 (not shown).
- the detected value of the voltage VC of the DC capacitor C1 by the voltage sensor 46 is input to the non-inverting input terminal (+ terminal).
- the threshold voltage DCOV2 (second threshold voltage) is input to the inverting input terminal ( ⁇ terminal).
- the threshold voltage DCOV2 (second threshold voltage) is set to a voltage value higher than the threshold voltage DCOV1 (first threshold voltage) used for abnormality detection in the control device 120.
- the threshold voltage DCOV2 is set to be higher than the threshold voltage DCOV1 and equal to or lower than the withstand voltage of the switching elements Q1 to Q4.
- the reason why the threshold voltage DCOV2 is set to a voltage value higher than the threshold voltage DCOV1 is to avoid the overlapping of the command based on the output of the comparator CP1 and the command based on the output of the comparator CP2 in each cell 10. Because.
- the comparator CP2 compares the detected value of the voltage VC with the threshold voltage DCOV2, and outputs a comparison result. When the detection value of the voltage VC exceeds the threshold voltage DCOV2, the output signal of the comparator CP2 becomes H level. On the other hand, when the detected value of the voltage VC becomes equal to or lower than the threshold voltage DCOV2, the output signal of the comparator CP2 becomes L level.
- the output signal of the comparator CP2 is given to the switch operation circuit 44 and the gate drive circuits 40 and 42.
- the gate driving circuits 40 and 42 autonomously enter the main circuit without depending on the gate cutoff signal GB. 30 is set to the gate cutoff state.
- the switch operation circuit 44 turns on the switch SW by autonomously supplying a current to the exciting coil 52 (FIG. 2) without depending on the ON command.
- one arm A (FIG. 1) of the MMC 110 is connected in series.
- the main circuit 30 is in a stopped state in some cells 10, while the main circuit 30 is maintained in an operating state in the remaining cells 10.
- a current flows in the direction indicated by the arrow in FIG. 4 in the main circuit 30.
- charges are accumulated in the capacitor C1.
- the voltage VC may further increase.
- FIG. 5 is a flowchart for explaining the abnormality detection processing of the voltage VC of the DC capacitor C1 in the control device 120 and each cell 10.
- step S ⁇ b> 11 the I / F circuit 48 transmits the voltage VC detected by the voltage sensor 46 to the control device 120.
- step S12 the I / F circuit 48 determines whether or not the gate cutoff signal GB is received from the control device 120. When it is determined that the gate cutoff signal GB has been received (YES in S12), the process proceeds to step S16, and the I / F circuit 48 outputs the gate cutoff signal GB to the gate drive circuits 40 and 42.
- the gate drive circuits 40 and 42 put the main circuit 30 in the gate cutoff state by supplying the gate cutoff signal GB to the gates of the switching elements Q1 to Q4.
- step S13 the I / F circuit 48 uses the comparator CP2 to detect the detected value of the voltage VC as a threshold value. It is determined whether or not the voltage DCOV2 is exceeded. When it is determined that the detected value of the voltage VC is equal to or lower than the threshold voltage DCOV2 (NO determination in S13), the I / F circuit 48 determines that no abnormality in the voltage VC has occurred and ends the process.
- the I / F circuit 48 outputs the output of the comparator CP2 activated to the H level.
- the signal is output to the gate drive circuits 40 and 42 and the switch operation circuit 44.
- step S14 the gate drive circuits 40 and 42 set the main circuit 30 in the gate cutoff state in response to the output signal activated to the H level.
- step S15 the switch operation circuit 44 short-circuits the first terminal 33 and the second terminal 34 by turning on the switch SW in response to the output signal activated to the H level.
- the control device 120 receives the detected value of the voltage VC of the DC capacitor C1 from the control circuit 32 of each cell 10 in step S20.
- the control device 120 proceeds to step S21, and determines whether or not the detected value of the voltage VC of each cell 10 exceeds the threshold voltage DCOV1 using the comparator CP1 provided for each cell 10.
- the control device 120 determines that the abnormality of the voltage VC has not occurred and performs processing. Exit.
- any cell 10 when it is determined that the detected value of the voltage VC exceeds the threshold voltage DCOV1 (YES determination in S21), the control device 120 is activated to the H level.
- the gate cutoff signal GB is generated, and the generated gate cutoff signal GB is output to the gate drive circuits 40 and 42 of all the cells 10.
- each cell 10 configuring MMC 110 detects that an abnormality in voltage VC of its own DC capacitor C1 is detected from self-diagnostic control device 120. Regardless of the gate cutoff signal GB transmitted, it is possible to autonomously put the main circuit 30 in the gate cutoff state. Thereby, when communication abnormality occurs between the control device 120 and the control circuit 32 of the cell 10, it is possible to avoid a serious failure of the cell 10.
- FIG. 6 is a diagram showing another configuration example of the cell 10 shown in FIG.
- cell 10A according to the present modification includes a main circuit 30A, a control circuit 32A, and a power supply 50.
- the main circuit 30A is constituted by a bidirectional chopper circuit provided with a DC capacitor.
- the main circuit 30A is a two-terminal circuit having a first terminal 33 and a second terminal 34, and includes switching elements Q1, Q2, diodes D1, D2, and a DC capacitor C1.
- the switch SW is connected between the first terminal 33 and the second terminal 34.
- the three-phase MMC 110 linked to the three-phase AC power system is exemplified as the power converter.
- the present invention drives a single-phase MMC or motor linked to the single-phase power system. It can also be applied to the MMC.
- the present invention provides a double Y-connection MMC formed by cascading a single-phase converter consisting of a series of arms and reactors composed of one or a plurality of cells connected in cascade, and six Y-connections.
- the present invention can also be applied to a delta connection MMC configured by three delta connections and a Y connection MMC configured by three Y connections of the single-phase converter.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Rectifiers (AREA)
Abstract
Description
図1は、この発明の実施の形態に従う電力変換装置の全体構成図である。図1を参照して、電力変換装置100は、モジュラー・マルチレベル変換器(MMC)110と、MMC110を制御する制御装置120とを備える。
アームA1~A6の各々は、カスケード接続された複数の単位変換器(以下、セルとも称す)10を含んでいる。図2は、図1に示したセル10の構成例を示す図である。図2を参照して、セル10は、主回路30と、制御回路32と、電源50とを含む。
制御装置120は、各セル10の制御回路32と通信することにより、各セル10の主回路30における電力変換を制御する。このとき、制御装置120は、各セル10の直流コンデンサC1の電圧VCの検出値に基づいて電力変換を制御することにより、各セル10の直流コンデンサC1を予め定められた直流電圧に充電する。
なお、上述した実施の形態では、セル10の主回路30がフルブリッジ回路を含む構成について例示したが、主回路30を双方向チョッパ回路を含む構成とすることもできる。
Claims (3)
- 1つまたは複数の単位変換器を直列接続して構成されたアームを備える電力変換器と、
前記電力変換器を制御する制御装置とを備え、
前記単位変換器は、
スイッチング素子および直流コンデンサを含み、前記スイッチング素子のオンオフにより前記直流コンデンサの電圧に応じた電圧パルスを出力する主回路と、
前記直流コンデンサの電圧検出値を前記制御装置へ送信するとともに、前記制御装置から受信した制御信号に従って前記スイッチング素子のオンオフを制御するように構成された制御回路と、
前記制御回路からのオン指令に応じてオンすることにより前記主回路の出力端子を短絡可能に構成されたスイッチとを含み、
前記制御装置は、前記複数の単位変換器からそれぞれ受信した複数の前記電圧検出値と第1の閾値電圧とを比較し、少なくとも1つの前記電圧検出値が前記第1の閾値電圧を超える場合には、各前記複数の単位変換器の前記制御回路に対して前記スイッチング素子をオフ状態に固定するための前記制御信号を送信するように構成され、
各前記複数の単位変換器において、前記制御回路は、自己の前記電圧検出値と前記第1の閾値電圧よりも高い第2の閾値電圧とを比較し、前記電圧検出値が前記第2の閾値電圧を超える場合には、前記制御信号に依らず自己の前記主回路の前記スイッチング素子を自律的にオフ状態に固定するとともに、前記スイッチをオンするように構成される、電力変換装置。 - 前記第2の閾値電圧は、前記第1の閾値電圧よりも高く、かつ、前記スイッチング素子の耐圧以下である、請求項1に記載の電力変換装置。
- 前記単位変換器は、前記直流コンデンサの電圧を降圧して前記制御回路へ供給する電源電圧を生成する電源をさらに含む、請求項1または2に記載の電力変換装置。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DK15895537.7T DK3309949T3 (da) | 2015-06-15 | 2015-06-15 | Effektomformningsindretning |
JP2017524156A JP6417042B2 (ja) | 2015-06-15 | 2015-06-15 | 電力変換装置 |
EP15895537.7A EP3309949B1 (en) | 2015-06-15 | 2015-06-15 | Power conversion device |
US15/736,051 US10122261B2 (en) | 2015-06-15 | 2015-06-15 | Power conversion device |
PCT/JP2015/067155 WO2016203516A1 (ja) | 2015-06-15 | 2015-06-15 | 電力変換装置 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2015/067155 WO2016203516A1 (ja) | 2015-06-15 | 2015-06-15 | 電力変換装置 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2016203516A1 true WO2016203516A1 (ja) | 2016-12-22 |
Family
ID=57546406
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2015/067155 WO2016203516A1 (ja) | 2015-06-15 | 2015-06-15 | 電力変換装置 |
Country Status (5)
Country | Link |
---|---|
US (1) | US10122261B2 (ja) |
EP (1) | EP3309949B1 (ja) |
JP (1) | JP6417042B2 (ja) |
DK (1) | DK3309949T3 (ja) |
WO (1) | WO2016203516A1 (ja) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110729909A (zh) * | 2019-10-21 | 2020-01-24 | 湖南大学 | 一种多端口铁路功率调节器系统及其综合控制方法 |
EP3614553A4 (en) * | 2017-04-21 | 2020-11-18 | Toshiba Mitsubishi-Electric Industrial Systems Corporation | POWER CONVERSION DEVICE |
WO2021070323A1 (ja) | 2019-10-10 | 2021-04-15 | 東芝三菱電機産業システム株式会社 | 電力変換装置 |
WO2023067719A1 (ja) | 2021-10-20 | 2023-04-27 | 東芝三菱電機産業システム株式会社 | 電力変換装置 |
WO2023079685A1 (ja) | 2021-11-05 | 2023-05-11 | 東芝三菱電機産業システム株式会社 | 電力変換装置のサブモジュール |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10992219B2 (en) * | 2017-06-27 | 2021-04-27 | Mitsubishi Electric Corporation | Power conversion device |
US10886858B1 (en) * | 2019-10-15 | 2021-01-05 | University Of Tennessee Research Foundation | Modular multi-level converter pre-chargers |
WO2021159219A1 (en) * | 2020-02-14 | 2021-08-19 | Ecole De Technologie Superieure | Three-phase multilevel electric power converter |
CN114498576B (zh) * | 2021-12-21 | 2022-10-14 | 西南交通大学 | 一种基于mmc的贯通柔性牵引变电所及其保护配置方法 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009506736A (ja) * | 2005-08-26 | 2009-02-12 | シーメンス アクチエンゲゼルシヤフト | 分散配置されたエネルギー蓄積器を有する電力変換回路 |
WO2011114816A1 (ja) * | 2010-03-15 | 2011-09-22 | 株式会社日立製作所 | 電力変換装置 |
JP2013027260A (ja) * | 2011-07-26 | 2013-02-04 | Hitachi Ltd | 電力変換装置 |
JP2015012726A (ja) * | 2013-06-28 | 2015-01-19 | 株式会社東芝 | 電力変換装置 |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5986909A (en) * | 1998-05-21 | 1999-11-16 | Robicon Corporation | Multiphase power supply with plural series connected cells and failed cell bypass |
DE102005041087A1 (de) | 2005-08-30 | 2007-03-01 | Siemens Ag | Stromrichterschaltung mit verteilten Energiespeichern |
WO2010145688A1 (en) * | 2009-06-15 | 2010-12-23 | Areva T&D Uk Limited | Converter control |
JP5449893B2 (ja) * | 2009-07-21 | 2014-03-19 | 株式会社日立製作所 | 電力変換装置 |
BR112012023820A2 (pt) * | 2010-03-23 | 2016-08-02 | Abb Technology Ag | conversor de fonte de voltagem e método para manuseio de falha do mesmo |
CN103891124A (zh) * | 2011-07-29 | 2014-06-25 | Abb技术有限公司 | Ctl单元保护 |
CN103107689A (zh) * | 2011-11-11 | 2013-05-15 | 台达电子企业管理(上海)有限公司 | 一种级联型变频器、功率单元及其旁路模块 |
EP2597764B1 (de) * | 2011-11-22 | 2016-04-13 | ABB Technology AG | Verfahren zur Behandlung von Fehlern in einem modularen Multilevelumrichter sowie ein solcher Umrichter |
JP5894777B2 (ja) * | 2011-12-07 | 2016-03-30 | 株式会社日立製作所 | 電力変換装置 |
US9219426B2 (en) * | 2012-02-09 | 2015-12-22 | Hitachi, Ltd. | Switching element, power converter, direct current transmission system, current control device, method of controlling power converter, and method of controlling current in voltage source converter |
US9876347B2 (en) * | 2012-08-30 | 2018-01-23 | Siemens Aktiengesellschaft | Apparatus and methods for restoring power cell functionality in multi-cell power supplies |
-
2015
- 2015-06-15 EP EP15895537.7A patent/EP3309949B1/en active Active
- 2015-06-15 DK DK15895537.7T patent/DK3309949T3/da active
- 2015-06-15 JP JP2017524156A patent/JP6417042B2/ja active Active
- 2015-06-15 US US15/736,051 patent/US10122261B2/en active Active
- 2015-06-15 WO PCT/JP2015/067155 patent/WO2016203516A1/ja active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009506736A (ja) * | 2005-08-26 | 2009-02-12 | シーメンス アクチエンゲゼルシヤフト | 分散配置されたエネルギー蓄積器を有する電力変換回路 |
WO2011114816A1 (ja) * | 2010-03-15 | 2011-09-22 | 株式会社日立製作所 | 電力変換装置 |
JP2013027260A (ja) * | 2011-07-26 | 2013-02-04 | Hitachi Ltd | 電力変換装置 |
JP2015012726A (ja) * | 2013-06-28 | 2015-01-19 | 株式会社東芝 | 電力変換装置 |
Non-Patent Citations (1)
Title |
---|
See also references of EP3309949A4 * |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3614553A4 (en) * | 2017-04-21 | 2020-11-18 | Toshiba Mitsubishi-Electric Industrial Systems Corporation | POWER CONVERSION DEVICE |
WO2021070323A1 (ja) | 2019-10-10 | 2021-04-15 | 東芝三菱電機産業システム株式会社 | 電力変換装置 |
CN110729909A (zh) * | 2019-10-21 | 2020-01-24 | 湖南大学 | 一种多端口铁路功率调节器系统及其综合控制方法 |
CN110729909B (zh) * | 2019-10-21 | 2021-11-05 | 湖南大学 | 一种多端口铁路功率调节器系统及其综合控制方法 |
WO2023067719A1 (ja) | 2021-10-20 | 2023-04-27 | 東芝三菱電機産業システム株式会社 | 電力変換装置 |
WO2023079685A1 (ja) | 2021-11-05 | 2023-05-11 | 東芝三菱電機産業システム株式会社 | 電力変換装置のサブモジュール |
Also Published As
Publication number | Publication date |
---|---|
DK3309949T3 (da) | 2020-03-23 |
JP6417042B2 (ja) | 2018-10-31 |
EP3309949B1 (en) | 2020-01-15 |
US20180191238A1 (en) | 2018-07-05 |
JPWO2016203516A1 (ja) | 2018-03-29 |
EP3309949A4 (en) | 2019-03-27 |
US10122261B2 (en) | 2018-11-06 |
EP3309949A1 (en) | 2018-04-18 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP6417042B2 (ja) | 電力変換装置 | |
JP6417043B2 (ja) | 電力変換装置 | |
JP6359213B1 (ja) | 電力変換装置 | |
JP6336236B1 (ja) | 電力変換装置 | |
WO2011114816A1 (ja) | 電力変換装置 | |
US10734916B2 (en) | Power conversion device | |
US20150003127A1 (en) | Multilevel power conversion circuit | |
US10840800B2 (en) | Power conversion device | |
US9744875B2 (en) | Motor vehicle, battery, and method for controlling a battery | |
JP5362657B2 (ja) | 電力変換装置 | |
CN102097925B (zh) | 一种级联型高压变频器旁通处理方法 | |
JP6974258B2 (ja) | 電力変換装置 | |
JP5490263B2 (ja) | 電力変換装置 | |
US11742775B2 (en) | Power conversion device | |
US9035612B2 (en) | Method for transferring energy between at least two energy storage cells in a controllable energy store | |
JP6886072B1 (ja) | 電力変換装置 | |
JP7143548B1 (ja) | 電力変換装置 | |
JP7232885B2 (ja) | 電力変換装置 | |
JP7414380B2 (ja) | 電力変換装置 | |
KR101707264B1 (ko) | 인버터 | |
JP2023037869A (ja) | 電力変換装置 | |
JPWO2020044454A1 (ja) | 電力変換装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 15895537 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2017524156 Country of ref document: JP Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 15736051 Country of ref document: US |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2015895537 Country of ref document: EP |