WO2018092240A1 - 電力変換装置 - Google Patents
電力変換装置 Download PDFInfo
- Publication number
- WO2018092240A1 WO2018092240A1 PCT/JP2016/084084 JP2016084084W WO2018092240A1 WO 2018092240 A1 WO2018092240 A1 WO 2018092240A1 JP 2016084084 W JP2016084084 W JP 2016084084W WO 2018092240 A1 WO2018092240 A1 WO 2018092240A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- phase
- converter
- voltage
- bus
- power
- 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
- 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
- H02M5/40—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 with intermediate conversion into dc
- H02M5/42—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 with intermediate conversion into dc by static converters
- H02M5/44—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 with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—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 with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—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 with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- 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
- H02M5/40—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 with intermediate conversion into dc
- H02M5/42—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 with intermediate conversion into dc by static converters
- H02M5/44—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 with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—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 with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—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 with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/4585—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 with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1216—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for AC-AC 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
- H02M7/42—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
- H02M7/487—Neutral point clamped inverters
Definitions
- This invention relates to a power converter.
- a power converter applied to an uninterruptible power supply is generally a converter that converts AC power from a commercial AC power source into DC power, and an inverter that converts the DC power into AC power having a desired frequency and voltage. And.
- Patent Document 1 discloses an uninterruptible power supply configured by a power conversion device including a three-level converter and a three-level inverter.
- a power conversion device including a three-level converter and a three-level inverter.
- each of the three-level converter and the three-level inverter includes a plurality of semiconductor switching elements.
- Patent Document 1 since nine fuses are used in total for each of the three-level converter and the three-level inverter, a large-sized device can be obtained by using a fuse having a large rated current value. There is a problem that it leads to increase in cost and cost.
- Patent Document 1 there is a possibility that the power loss generated in each fuse increases when the power converter is operating, resulting in a reduction in the efficiency of the power converter.
- a main object of the present invention is to provide a power converter capable of realizing a high overcurrent and overvoltage prevention effect with a simple configuration.
- a power conversion device is configured to convert first to third-phase AC voltages supplied from an AC power source into fourth to sixth-phase AC voltages and supply them to a load.
- the power conversion device includes first to third power converters.
- the first power converter is configured to convert a first-phase AC voltage into a fourth-phase AC voltage.
- the second power converter is configured to convert a second phase AC voltage to a fifth phase AC voltage.
- the third power converter is configured to convert a third phase AC voltage to a sixth phase AC voltage.
- the first power converter includes a first phase converter, a fourth phase inverter, a first DC positive bus, and a first DC negative bus.
- the first phase converter is configured to convert a first phase AC voltage to a first DC voltage.
- the fourth phase inverter is configured to convert the first DC voltage supplied from the first phase converter into a fourth phase AC voltage.
- the first DC positive bus and the first DC negative bus are connected between the first phase converter and the fourth phase inverter.
- the second power converter includes a second phase converter, a fifth phase inverter, a second DC positive bus and a second DC negative bus.
- the second phase converter is configured to convert a second phase AC voltage to a second DC voltage.
- the fifth phase inverter is configured to convert the second DC voltage supplied from the second phase converter into a fifth phase AC voltage.
- the second DC positive bus and the second DC negative bus are connected between the second phase converter and the fifth phase inverter.
- the third power converter includes a third phase converter, a sixth phase inverter, a third DC positive bus and a third DC negative bus.
- the third phase converter is configured to convert a third phase AC voltage to a third DC voltage.
- the sixth phase inverter is configured to convert the third DC voltage supplied from the third phase converter into a sixth phase AC voltage.
- the third DC positive bus and the third DC negative bus are connected between the third phase converter and the sixth phase inverter.
- the power conversion device further includes first to fourth fuses.
- the first and second fuses are connected between the first and second DC positive buses and between the second and third DC positive buses, respectively.
- the third and fourth fuses are connected between the first and second DC negative buses and between the second and third DC negative buses, respectively.
- FIG. 2 is a circuit diagram illustrating in detail the configuration of a single-phase converter and a single-phase inverter shown in FIG. 1.
- FIG. 3 is a waveform diagram for explaining ON / OFF timing of the IGBT element shown in FIG. 2.
- FIG. 3 is a circuit diagram showing the function of the fuse shown in FIG. 2.
- FIG. 3 is a circuit diagram showing the function of the fuse shown in FIG. 2.
- FIG. 3 is a circuit diagram showing the function of the fuse shown in FIG. 2.
- It is a schematic block diagram which shows the main circuit structure of the power converter device by the modification of embodiment of this invention.
- FIG. 1 is a schematic block diagram showing a main circuit configuration of a power conversion apparatus 100 according to an embodiment of the present invention.
- Power conversion device 100 according to the embodiment of the present invention is applied to, for example, an uninterruptible power supply.
- the AC power source 1 supplies commercial power three-phase AC power to the power converter 100.
- the load 4 is driven by three-phase AC power having a commercial frequency supplied from the power conversion device 100.
- the power conversion apparatus 100 includes three converter units U1 to U3 connected in parallel between an AC power source 1 and a load 4.
- the power conversion device 100 further includes wirings WP1, WP2, WN1, WN2, WC1, WC2 and a control circuit 7.
- power converter 100 is connected to DC positive bus PL4, DC negative bus NL4, DC neutral point bus CL4, bidirectional chopper 5, and DC power supply 6 to constitute an uninterruptible power supply.
- the first converter unit U1 includes an R-phase converter 2R, a U-phase inverter 3U, a DC positive bus PL1, a DC negative bus NL1, a DC neutral point bus CL1, and capacitors C1R, C2R, C1U, C2U.
- the R phase voltage is supplied to the R phase converter 2R from the AC power source 1 via the R phase line RL.
- R-phase converter 2R converts R-phase voltage VR into a DC voltage, and supplies the DC voltage to U-phase inverter 3U via DC buses PL1, CL1, NL1.
- U-phase inverter 3U converts the DC voltage from R-phase converter 2R into U-phase voltage VU.
- the U-phase voltage VU generated by the U-phase inverter 3U is supplied to the load 4 via the U-phase line UL.
- Capacitors C1R and C1U are connected in parallel between DC positive bus PL1 and DC neutral point bus CL1.
- Capacitors C2R and C2U are connected in parallel between DC neutral point bus CL1 and DC negative bus NL1.
- the second converter unit U2 includes an S-phase converter 2S, a V-phase inverter 3V, a DC positive bus PL2, a DC negative bus NL2, a DC neutral point bus CL2, and capacitors C1S, C2S, C1V, C2V.
- S phase voltage VS is supplied to S phase converter 2S from AC power supply 1 via S phase line SL.
- S-phase converter 2S converts S-phase voltage VS into a DC voltage, and supplies the DC voltage to V-phase inverter 3V via DC buses PL2, CL2, NL2.
- V-phase inverter 3V converts the DC voltage from S-phase converter 2S into V-phase voltage VV.
- the V-phase voltage VV generated by the V-phase inverter 3V is supplied to the load 4 via the V-phase line VL.
- Capacitors C1S and C1V are connected in parallel between DC positive bus PL2 and DC neutral point bus CL2.
- Capacitors C2S and C2V are connected in parallel between DC neutral point bus CL2 and DC negative bus NL2.
- the third converter unit U3 includes a T-phase converter 2T, a W-phase inverter 3W, a DC positive bus PL3, a DC negative bus NL3, a DC neutral point bus CL3, and capacitors C1T, C2T, C1W, C2W.
- T-phase voltage is supplied to the T-phase converter 2T from the AC power supply 1 via the T-phase line TL.
- T-phase converter 2T converts T-phase voltage VT into a DC voltage, and supplies the DC voltage to W-phase inverter 3W via DC buses PL3, CL3, and NL3.
- W-phase inverter 3W converts the DC voltage from T-phase converter 2T into W-phase voltage VW.
- the W-phase voltage VW generated by the W-phase inverter 3W is supplied to the load 4 through the W-phase line WL.
- Capacitors C1T and C1W are connected in parallel between DC positive bus PL3 and DC neutral point bus CL3.
- Capacitors C2T and C2W are connected in parallel between DC neutral point bus CL3 and DC negative bus NL3.
- each of converter units U1-U3 includes one single-phase converter, one single-phase inverter, three DC buses (DC positive bus, DC negative bus, DC neutral point bus), and Consists of four capacitors.
- Wirings WP1, WN1, and WC1 are provided between the first converter unit U1 and the second converter unit U2. Specifically, wiring WP1 is connected between DC positive buses PL1 and PL2. Wiring WN1 is connected between DC negative buses NL1 and NL2. Wiring WC1 is connected between DC neutral point buses CL1 and CL2.
- Wirings WP2, WN2, and WC2 are provided between the second converter unit U2 and the third converter unit U3. Specifically, wiring WP2 is connected between DC positive buses PL2 and PL3. Wiring WN2 is connected between DC negative buses NL2 and NL3. Wiring WC2 is connected between DC neutral point buses CL2 and CL3.
- DC positive bus PL4, DC negative bus NL4, and DC neutral point bus CL4 are provided between third converter unit U3 and bidirectional chopper 5. Specifically, DC positive bus PL4, DC negative bus NL4, and DC neutral point bus CL4 are respectively connected between DC positive bus PL3, DC negative bus NL3, DC neutral point bus CL3, and bidirectional chopper 5. Is done.
- Bidirectional chopper 5 is connected between DC positive bus PL4, DC negative bus NL4, DC neutral point bus CL4, and DC power supply 6.
- Bidirectional chopper 5 is configured to perform DC voltage conversion bidirectionally between DC buses PL4, NL4, CL4 and DC power supply 6.
- DC positive buses PL1, PL2, PL3 are connected to each other via wirings WP1, WP2. Thereby, the voltages of DC positive buses PL1, PL2, and PL3 can be matched.
- DC negative buses NL1, NL2, and NL3 are connected to each other via the wirings WN1 and WN2. Thereby, the voltage of DC negative bus-line NL1, NL2, NL3 can be made to correspond.
- DC neutral point buses CL1, CL2, CL3 are connected to each other via the wirings WC1, WC2. As a result, the voltages of the DC neutral point buses CL1, CL2, CL3 can be matched.
- the input voltages of the single-phase inverters 3U, 3V, and 3W of the converter units U1 to U3 can be matched. Therefore, the amplitudes of the phase voltages output from the single-phase inverters 3U, 3V, 3W can be matched.
- R-phase converter 2R, S-phase converter 2S, and T-phase converter 2T constitute a three-phase converter.
- the three-phase converter converts the three-phase AC power supplied from the AC power source 1 into DC power, and the U-phase inverter 3U, the V-phase inverters 3V and W via the DC positive bus, the DC negative bus, and the DC neutral point bus. Each is supplied to the phase inverter 3W.
- U-phase inverter 3U, V-phase inverter 3V and W-phase inverter 3W constitute a three-phase inverter.
- the three-phase inverter converts DC power supplied through a DC positive bus, a DC negative bus, and a DC neutral point bus into three-phase AC power.
- Three-phase AC power generated by the three-phase inverter is supplied to the load 4 via the U-phase line UL, the V-phase line VL, and the W-phase line WL.
- the bidirectional chopper 5 steps down the DC voltage between the DC buses PL4 and CL4 and the DC voltage between the DC buses CL4 and NL4 during normal times when three-phase AC power is supplied from the AC power source 1. By supplying to 6, the DC power supply 6 is charged. The bidirectional chopper 5 boosts the voltage between the terminals of the DC power supply 6 between the DC buses PL4 and CL4 and between the DC buses CL4 and NL4 during a power failure when the supply of the three-phase AC voltage from the AC power supply 1 is interrupted. The DC power supply 6 is discharged by supplying to each.
- the control circuit 7 includes a three-phase AC voltage supplied from the AC power source 1, DC voltages of the DC buses PL4, NL4, CL4, a voltage between terminals of the DC power source 6, a three-phase inverter (single-phase inverters 3U, 3V, 3W). ) And three-phase converters (single-phase converters 2R, 2S, 2T), three-phase inverters (single-phase inverter 3U) based on the three-phase AC voltage output from , 3V, 3W) and the operation of the bidirectional chopper 5.
- FIG. 2 is a circuit diagram illustrating in detail the configuration of single-phase converters 2R, 2S, and 2T and single-phase inverters 3U, 3V, and 3W shown in FIG.
- R-phase converter 2R includes IGBT elements Q1R to Q4R and diodes D1R to D4R.
- S-phase converter 2S includes IGBT elements Q1S to Q4S and diodes D1S to D4S.
- T-phase converter 2T includes IGBT elements Q1T to Q4T and diodes D1T to D4T.
- U-phase inverter 3U includes IGBT elements Q1U to Q4U and diodes D1U to D4U.
- V-phase inverter 3V includes IGBT elements Q1V to Q4V and diodes D1V to D4V.
- W-phase inverter 3W includes IGBT elements Q1W to Q4W and diodes D1W to D4W.
- the emitter of IGBT element Q1x is connected to x-phase line xL, and its collector is connected to DC positive bus PLi.
- IGBT element Q2x has a collector connected to x-phase line xL and an emitter connected to DC negative bus NLi.
- the emitter of IGBT element Q3x is connected to x-phase line xL, and its collector is connected to the collector of IGBT element Q4x.
- the emitter of IGBT element Q4x is connected to DC neutral point bus CLi.
- the diodes D1x and D2x function as freewheeling diodes, and the diodes D3x and D4x function as clamp diodes.
- IGBT elements Q3x, Q4x and diodes D3x, D4x constitute an AC switch.
- FIG. 3 is a waveform diagram showing the relationship between the R-phase voltage VR and the on / off states of the IGBT elements Q1R to Q4R.
- the R-phase voltage VR is compared with the reference signals ⁇ 1R and ⁇ 2R, and on / off combinations of the IGBT elements Q1R to Q4R are determined based on the comparison result.
- the reference signals ⁇ 1R and ⁇ 2R are triangular wave signals having a frequency five times that of the R-phase voltage VR and synchronized with the R-phase voltage VR.
- the reference signal ⁇ 2R is a triangular wave signal in phase with the reference signal ⁇ 1R.
- the IGBT elements Q3R and Q4R are on during the period (t1, t3, t5, t7, t9, t11, t13) in which the level of the R-phase voltage VR is between the levels of the reference signals ⁇ 1R and ⁇ 2R. Then, IGBT elements Q1R and Q2R are turned off. During periods (t2, t4, t10, t12) in which the level of the R-phase voltage Vr is higher than the levels of the reference signals ⁇ 1R, ⁇ 2R, the IGBT elements Q1R, Q3R are turned on and the IGBT elements Q2R, Q4R are turned off.
- power conversion device 100 further includes fuses FP1, FP2, FN1, FN2, FC1, and FC2.
- the fuse FP1 is inserted into the wiring WP1, and is blown when an overcurrent flows through the wiring WP1.
- the fuse FN1 is inserted into the wiring WN1, and is blown when an overcurrent flows through the wiring WN1.
- the fuse FC1 is inserted into the wiring WC1, and is blown when an overcurrent flows through the wiring WC1.
- the fuse FP2 is inserted into the wiring WP2, and is blown when an overcurrent flows through the wiring WP2.
- the fuse FN2 is inserted into the wiring WN2, and is blown when an overcurrent flows through the wiring WN2.
- the fuse FC2 is inserted into the wiring WC2, and is blown when an overcurrent flows through the wiring WC2.
- FIG. 4 is a diagram showing a case where the IGBT element Q4R fails and is short-circuited during the period when the IGBT elements Q1R and Q3S are on.
- a short-circuit current is generated in a path from the R-phase line RL to the S-phase line SL via the diode D3R, the IGBT element Q4R, the wiring WC1, the diode D4S, and the IGBT element Q3S.
- the fuse FC1 is blown out.
- a short circuit occurs in a path from the positive electrode of the capacitor C1S to the negative electrode of the capacitor C1S through the wiring WP1, the IGBT element Q1R, the diode D3R, the IGBT element Q4R, and the wiring WC1. Current flows, and fuses FP1 and FC1 are blown.
- FIG. 5 is a diagram illustrating a case where the IGBT element Q3R has failed and is in a short-circuited state while the IGBT elements Q2R and Q4S are on.
- a short circuit current is generated on the path from S phase line SL to R phase line RL via diode D3S, IGBT element Q4S, wiring WC1, diode D4R, and IGBT element Q3R. Flows, and the fuse FC1 is blown.
- a short-circuit current flows in a path from the positive electrode of the capacitor C2S to the negative electrode of the capacitor C2S through the wiring WC1, the diode D4R, the IGBT element Q3R, the IGBT element Q2R, and the wiring WN1.
- the fuses FC1 and FN1 are blown.
- FIG. 6 is a diagram showing a case where the IGBT elements Q3R and Q4R have failed and become short-circuited. As shown in FIGS. 4 and 5, since fuses FP1, FC1, and FN1 are blown, R phase and S phase are completely separated. This prevents an overcurrent from flowing or an overvoltage from occurring. 4 to 6, the R phase and the S phase have been described as examples, but the same applies to other phases (T phase, U phase, V phase, W phase).
- FIG. 7 is a circuit diagram illustrating a configuration of a power conversion apparatus 1000 according to a comparative example.
- the power conversion apparatus 1000 according to the comparative example corresponds to the power conversion apparatus disclosed in Patent Document 1 described above.
- the power converter 1000 according to the comparative example basically has the same basic structure including the converter and the inverter as the power converter 100 according to the present embodiment shown in FIG. 1, but the configuration of the converter unit is different. Yes.
- a power conversion apparatus 1000 includes one converter unit U connected between an AC power supply 1 and a load 4 (both not shown).
- Converter unit U includes a three-phase converter 2, a three-phase inverter 3, a DC positive bus PL, a DC negative bus NL, and a DC neutral point bus CL.
- Three-phase converter 2 is configured by connecting R-phase converter 2R, S-phase converter 2S and T-phase converter 2T shown in FIGS. 1 and 2 in parallel between DC positive bus PL and DC negative bus NL.
- Three-phase inverter 3 is configured by connecting U-phase inverter 3U, V-phase inverter 3V and W-phase inverter 3W shown in FIGS. 1 and 2 in parallel between DC positive bus PL and DC negative bus NL.
- the operations of the three-phase converter 2 and the three-phase inverter 3 are substantially the same as the operations of the single-phase converters 2R, 2S, 2T and the single-phase inverters 3U, 3V, 3W described with reference to FIG.
- the power conversion apparatus 1000 further includes fuses F1R to F3R, F1S to F3S, F1T to F3T, F1U to F3U, F1V to F3V, F1W to F3W.
- fuses F1R to F3R, F1S to F3S, F1T to F3T, F1U to F3U, F1V to F3V, F1W to F3W In order to comprehensively describe the configuration of these fuses, the symbols R, S, T, U, V, and W are collectively denoted as “x”.
- the fuse F1x is connected between the collector of the IGBT element Q1x and the DC positive bus PL.
- Fuse F2x is connected between the emitter of IGBT element Q2x and DC negative bus NL.
- Fuse F3x is connected between the emitter of IGBT element Q4x and DC neutral point bus CLx.
- a short-circuit current flows in a path from the positive electrode of the capacitor C1S to the negative electrode of the capacitor C1S via the fuses F1S, F1R, the IGBT element Q1R, the diode D3R, the IGBT element Q4R, and the fuses F3R, F3S, and the fuse F1S. , F1R, F3R, F3S are blown out.
- the fuse is blown, and the failed phase and the normal phase are separated. An overcurrent or an overvoltage is prevented from occurring.
- each fuse is inserted in a current path when the three-phase converter 2 and the three-phase inverter 3 are operating. Therefore, in order to prevent the fuse from being blown when the three-phase converter 2 and the three-phase inverter 3 are operating normally, a fuse having a rated current value higher than the maximum value of the current flowing through the current path is provided. Must be used.
- the rated current value of the fuse refers to a current value that does not melt when flowing through the fuse constantly.
- the IGBT element and the fuse are electrically connected in series, a high surge voltage is caused by the reactor component of the fuse during the switching operation of the IGBT element. There is a possibility of being applied to the element. Therefore, it is necessary to take measures to avoid failure due to surge voltage.
- each fuse is inserted in the current path when the three-phase converter 2 and the three-phase inverter 3 are operating, a power loss occurs due to the resistance component of each fuse, and as a result, the power conversion device There is a problem that the efficiency of 1000 is lowered.
- the power conversion apparatus 100 can be protected from the overcurrent and the overvoltage.
- the number of fuses can be reduced as compared with the power converter 1000 according to the comparative example. According to this embodiment, the number of fuses can be halved. Therefore, according to power converter 100 according to the present embodiment, the power converter can be reduced in size and cost.
- the single-phase converters 2R, 2S, and 2T are three-level converters, and the single-phase inverters 3U, 3V, and 3W are three-level inverters.
- the single-phase converter is a two-level converter
- the single-phase inverter may be a two-level inverter.
- FIG. 8 is a circuit diagram illustrating a configuration of a power conversion device 100A according to a modification of the embodiment. As shown in FIG. 8, each converter unit includes two DC buses (DC positive bus and DC negative bus) and two capacitors connected in parallel between the two DC buses. Consists of. Even in this modified example, when the IGBT element fails in either the single-phase converter or the single-phase inverter and is short-circuited, the fuse is blown, so that the same effect as in the embodiment can be obtained.
- each corresponds to “first to third power converters”.
- the R-phase converter, S-phase converter, and T-phase converter correspond to the “first-phase converter”, “second-phase converter”, and “third-phase converter” in the present invention, respectively, U-phase inverter, V-phase inverter, W-phase
- the inverters correspond to “fourth phase inverter”, “fifth phase inverter”, and “sixth phase inverter” in the present invention, respectively.
- DC positive buses PL1 to PL4 correspond to “first to fourth DC positive buses” in the present invention, respectively, and DC negative buses NL1 to NL4 correspond to “first to fourth DC negative buses” in the present invention, respectively.
- the DC neutral point buses CL1 to CL4 correspond to the “first to fourth DC neutral point buses” in the present invention, respectively.
Abstract
Description
交流電源1からの三相交流電力は、R相ラインRL、S相ラインSLおよびT相ラインTLを介してR相コンバータ2R、S相コンバータ2SおよびT相コンバータ2Tにそれぞれ供給される。R相コンバータ2R、S相コンバータ2SおよびT相コンバータ2Tは三相コンバータを構成する。三相コンバータは、交流電源1から供給される三相交流電力を直流電力に変換し、直流正母線、直流負母線および直流中性点母線を介してU相インバータ3U、V相インバータ3VおよびW相インバータ3Wにそれぞれ供給する。U相インバータ3U、V相インバータ3VおよびW相インバータ3Wは三相インバータを構成する。三相インバータは、直流正母線、直流負母線および直流中性点母線を介して供給される直流電力を三相交流電力に変換する。三相インバータで生成された三相交流電力は、U相ラインUL、V相ラインVLおよびW相ラインWLを介して負荷4に供給される。
次に、比較例による電力変換装置と対比しながら、本実施の形態による電力変換装置の作用効果について説明する。
Claims (4)
- 交流電源から供給される第1~第3相の交流電圧を第4~第6相の交流電圧に変換して負荷に供給するための電力変換装置であって、
前記第1相の交流電圧を前記第4相の交流電圧に変換するように構成された第1の電力変換器と、
前記第2相の交流電圧を前記第5相の交流電圧に変換するように構成された第2の電力変換器と、
前記第3相の交流電圧を前記第6相の交流電圧に変換するように構成された第3の電力変換器とを備え、
前記第1の電力変換器は、
前記第1相の交流電圧を第1の直流電圧に変換する第1相コンバータと、
前記第1相コンバータから供給される前記第1の直流電圧を前記第4相の交流電圧に変換する第4相インバータと、
前記第1相コンバータと前記第4相インバータとの間に接続される第1の直流正母線および第1の直流負母線とを含み、
前記第2の電力変換器は、
前記第2相の交流電圧を第2の直流電圧に変換する第2相コンバータと、
前記第2相コンバータから供給される前記第2の直流電圧を前記第5相の交流電圧に変換する第5相インバータと、
前記第2相コンバータと前記第5相インバータとの間に接続される第2の直流正母線および第2の直流負母線とを含み、
前記第3の電力変換器は、
前記第3相の交流電圧を第3の直流電圧に変換する第3相コンバータと、
前記3相コンバータから供給される前記第3の直流電圧を前記第6相の交流電圧に変換する第6相インバータと、
前記第3相コンバータと前記第6相インバータとの間に接続される第3の直流正母線および第3の直流負母線とを含み、
前記電力変換装置は、さらに、
前記第1および第2の直流正母線の間、ならびに、前記第2および第3の直流正母線の間にそれぞれ接続される第1および第2のヒューズと、
前記第1および第2の直流負母線の間、ならびに、前記第2および第3の直流負母線の間にそれぞれ接続される第3および第4のヒューズとを備える、電力変換装置。 - 前記電力変換装置は、さらに、
前記第3の直流正母線が接続される第4の直流正母線と、
前記第3の直流負母線が接続される第4の直流負母線とを備え、
前記第4の直流正母線および前記第4の直流負母線と直流電源との間に設けられ、前記第4の直流正母線および前記第4の直流負母線間と前記直流電源との間で双方向に直流電圧変換を行なうように構成される直流電圧変換器をさらに備える、請求項1に記載の電力変換装置。 - 前記第1相~第3相コンバータの各々は3レベルコンバータであり、
前記第4相~第6相インバータの各々は3レベルインバータであり、
前記第1の電力変換器は、前記第1相コンバータと前記第4相インバータとの間に接続される第1の直流中性点母線をさらに含み、
前記第2の電力変換器は、前記第2相コンバータと前記第5相インバータとの間に接続される第2の直流中性点母線をさらに含み、
前記第3の電力変換器は、前記第3相コンバータと前記第6相インバータとの間に接続される第3の直流中性点母線をさらに含み、
前記電力変換装置は、さらに、
前記第1および第2の直流中性点母線の間、ならびに、前記第2および第3の直流中性点母線の間にそれぞれ接続される第5および第6のヒューズを備える、請求項1に記載の電力変換装置。 - 前記電力変換装置は、さらに、
前記第3の直流中性点負母線に接続される第4の直流中性点母線を備え、
前記第4の直流正母線、前記第4の直流負母線および前記第4の直流中性点母線と直流電源との間に設けられ、前記第4の直流正母線、前記第4の直流負母線および前記第4の直流中性点母線と前記直流電源との間で双方向に直流電圧変換を行なうように構成される直流電圧変換器をさらに備える、請求項3に記載の電力変換装置。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201680089655.8A CN109792216B (zh) | 2016-11-17 | 2016-11-17 | 电力转换装置 |
JP2018550938A JP6687754B2 (ja) | 2016-11-17 | 2016-11-17 | 電力変換装置 |
KR1020197006747A KR102266020B1 (ko) | 2016-11-17 | 2016-11-17 | 전력 변환 장치 |
PCT/JP2016/084084 WO2018092240A1 (ja) | 2016-11-17 | 2016-11-17 | 電力変換装置 |
US16/323,974 US10587203B2 (en) | 2016-11-17 | 2016-11-17 | Power conversion apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2016/084084 WO2018092240A1 (ja) | 2016-11-17 | 2016-11-17 | 電力変換装置 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2018092240A1 true WO2018092240A1 (ja) | 2018-05-24 |
Family
ID=62145337
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2016/084084 WO2018092240A1 (ja) | 2016-11-17 | 2016-11-17 | 電力変換装置 |
Country Status (5)
Country | Link |
---|---|
US (1) | US10587203B2 (ja) |
JP (1) | JP6687754B2 (ja) |
KR (1) | KR102266020B1 (ja) |
CN (1) | CN109792216B (ja) |
WO (1) | WO2018092240A1 (ja) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109196766B (zh) * | 2016-05-31 | 2020-09-29 | 东芝三菱电机产业系统株式会社 | 双向绝缘型dc/dc转换器及智能电网 |
FR3052307B1 (fr) * | 2016-06-07 | 2019-07-12 | Thales | Demarreur generateur sans balais |
WO2018092239A1 (ja) * | 2016-11-17 | 2018-05-24 | 東芝三菱電機産業システム株式会社 | 電力変換装置 |
US11424693B2 (en) * | 2018-04-27 | 2022-08-23 | Toshiba Mitsubishi-Electric Industrial Systems Corporation | Three-level power conversion device, three-level power conversion device control method, and storage medium |
JP7140711B2 (ja) * | 2019-05-20 | 2022-09-21 | 東芝三菱電機産業システム株式会社 | 無停電電源システム |
CN113013981B (zh) * | 2021-02-26 | 2022-08-02 | 北京百度网讯科技有限公司 | 一种配电系统 |
CN115398790A (zh) * | 2021-03-05 | 2022-11-25 | 东芝三菱电机产业系统株式会社 | 电力变换器 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007129469A1 (ja) * | 2006-05-08 | 2007-11-15 | Mitsubishi Electric Corporation | 電力変換装置 |
WO2010095241A1 (ja) * | 2009-02-20 | 2010-08-26 | 東芝三菱電機産業システム株式会社 | 電力変換装置 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4598495B2 (ja) * | 2004-11-29 | 2010-12-15 | 東芝三菱電機産業システム株式会社 | 電力変換装置 |
MX2011002969A (es) * | 2008-10-16 | 2011-04-11 | Toshiba Mitsubishi Elec Inc | Dispositivo de conversion de energia. |
WO2010106652A1 (ja) * | 2009-03-18 | 2010-09-23 | 東芝三菱電機産業システム株式会社 | 無停電電源装置 |
KR101369697B1 (ko) * | 2009-09-16 | 2014-03-04 | 도시바 미쓰비시덴키 산교시스템 가부시키가이샤 | 전력 변환 시스템 및 무정전 전원 시스템 |
CN104756341B (zh) * | 2011-07-14 | 2017-04-05 | 维斯塔斯风力系统集团公司 | 发电系统和操作发电系统的方法 |
DE102015206627A1 (de) * | 2014-07-09 | 2016-01-28 | Siemens Aktiengesellschaft | Selbstsichernder Umrichter |
JP5778840B1 (ja) * | 2014-09-25 | 2015-09-16 | 株式会社日立製作所 | 電力変換ユニットおよび電力変換装置 |
CN205178889U (zh) * | 2015-11-09 | 2016-04-20 | 中国矿业大学 | 优化后的双变频器公用直流母线系统 |
-
2016
- 2016-11-17 KR KR1020197006747A patent/KR102266020B1/ko active IP Right Grant
- 2016-11-17 US US16/323,974 patent/US10587203B2/en active Active
- 2016-11-17 CN CN201680089655.8A patent/CN109792216B/zh active Active
- 2016-11-17 JP JP2018550938A patent/JP6687754B2/ja active Active
- 2016-11-17 WO PCT/JP2016/084084 patent/WO2018092240A1/ja active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007129469A1 (ja) * | 2006-05-08 | 2007-11-15 | Mitsubishi Electric Corporation | 電力変換装置 |
WO2010095241A1 (ja) * | 2009-02-20 | 2010-08-26 | 東芝三菱電機産業システム株式会社 | 電力変換装置 |
Also Published As
Publication number | Publication date |
---|---|
KR20190038888A (ko) | 2019-04-09 |
CN109792216A (zh) | 2019-05-21 |
JPWO2018092240A1 (ja) | 2019-06-24 |
KR102266020B1 (ko) | 2021-06-16 |
US20190214811A1 (en) | 2019-07-11 |
US10587203B2 (en) | 2020-03-10 |
CN109792216B (zh) | 2021-01-15 |
JP6687754B2 (ja) | 2020-04-28 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP6687754B2 (ja) | 電力変換装置 | |
KR101136404B1 (ko) | 전력 변환 장치 | |
US10128741B2 (en) | Power conversion device | |
JP5049964B2 (ja) | 電力変換装置 | |
US10003273B2 (en) | Power conversion device | |
Katebi et al. | Advanced three level active neutral point converter with fault tolerant capabilities | |
WO2018092239A1 (ja) | 電力変換装置 | |
JP6706395B2 (ja) | 電力変換装置 | |
KR102364537B1 (ko) | 전력 변환 장치 | |
KR20170050605A (ko) | 고장 회피 회로를 가지는 멀티레벨 인버터 |
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: 16921509 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2018550938 Country of ref document: JP Kind code of ref document: A |
|
ENP | Entry into the national phase |
Ref document number: 20197006747 Country of ref document: KR Kind code of ref document: A |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 16921509 Country of ref document: EP Kind code of ref document: A1 |