WO2014010474A1 - 電力変換装置 - Google Patents
電力変換装置 Download PDFInfo
- Publication number
- WO2014010474A1 WO2014010474A1 PCT/JP2013/068175 JP2013068175W WO2014010474A1 WO 2014010474 A1 WO2014010474 A1 WO 2014010474A1 JP 2013068175 W JP2013068175 W JP 2013068175W WO 2014010474 A1 WO2014010474 A1 WO 2014010474A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- voltage terminal
- inductance
- converter
- voltage
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/145—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
- H02M7/155—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
- H02M7/19—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only arranged for operation in series, e.g. for voltage multiplication
-
- 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
-
- 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
-
- 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
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/0074—Plural converter units whose inputs are connected in series
-
- 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
- H02M7/493—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 the static converters being arranged for operation in parallel
Definitions
- the present invention relates to a power converter that converts AC power into DC power, or converts DC power into AC power.
- Non-Patent Document 1 a multilevel converter having a circuit configuration in which converter cells for generating a DC voltage are connected in series.
- reactors are provided between the AC voltage terminals U, V, W and the DC voltage terminal P, and between the AC voltage terminals U, V, W and the DC voltage terminal N.
- An added multilevel converter has been proposed (for example, Non-Patent Document 2).
- a multilevel converter having a reactor in which a reactor connected to the positive electrode side and a reactor connected to the negative electrode side are magnetically coupled has been proposed (for example, Non-Patent Document 3).
- Non-Patent Document 1 Since the power converter disclosed in Non-Patent Document 1 does not have a reactor, the inductance component is small and the direct current flowing through the converter cell cannot be controlled.
- the power converters disclosed in Non-Patent Documents 2 and 3 are suitable for high-voltage applications in that converter cells are connected in series, but the reactor is large, heavy, and installed at a high potential location. Therefore, a high insulation voltage is required. Moreover, when ensuring insulation with a lever etc., it becomes difficult to ensure earthquake resistance.
- the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a power converter having high earthquake resistance, in which a reactor is reduced in size and an insulation voltage is reduced.
- a first power conversion device includes an AC voltage terminal and a DC voltage terminal, wherein one or more converter cells are connected in series between the AC voltage terminal and the DC voltage terminal.
- the converter cell includes a semiconductor element and a capacitor, and the converter cell series body is connected between the DC voltage terminal and the AC voltage terminal at the lowest potential with respect to the ground among the DC voltage terminals. And having a first inductance connected in series.
- a second power converter includes a first AC voltage terminal, a second AC voltage terminal, a positive DC voltage terminal, a negative DC voltage terminal, and a positive and negative DC voltage terminal.
- a neutral point between the first AC voltage terminal and the positive DC voltage terminal, between the first AC voltage terminal and the neutral point, and between the second AC voltage terminal and the neutral point.
- a converter cell series body in which one or more converter cells are connected in series, respectively, between the second AC voltage terminal and the negative DC voltage terminal, the converter cell being a semiconductor element And a capacitor, and having a third inductance connected in series with the converter cell series body between the first AC voltage terminal and the neutral point, the second AC voltage terminal and the neutral point, In the meantime, it has a 4th inductance connected in series with a converter cell serial body.
- the 1st power converter device concerning this invention is constituted as mentioned above, since a reactor can be reduced in size and can be installed in a place near earth potential, insulation voltage can also be reduced, insulation becomes easy, and high earthquake resistance It is possible to provide a power conversion device having the characteristics.
- the reactor can be reduced in size, and can be installed at a location close to the ground potential, so that the insulation voltage can be reduced, insulation becomes easy, and high earthquake resistance. It is possible to provide a power conversion device having the characteristics.
- Embodiment 1 In the first embodiment, one or more converter cells composed of a semiconductor element and a capacitor are connected in series between a three-phase AC voltage terminal and a DC voltage terminal (P, N), and the lowest with respect to the ground.
- the present invention relates to a power converter having a configuration in which a reactor is connected in series with a converter cell series body between a DC voltage terminal and an AC voltage terminal at a potential.
- FIG. 1 is a main circuit configuration diagram of the power conversion device
- FIG. 2 is a circuit diagram of the converter cell, and one phase of the main circuit. 3 will be described with reference to FIG. 3, which is an explanatory diagram of current and voltage
- FIG. 4 to FIG. 7 which are main circuit configuration diagrams of other embodiments
- FIG. 8 which is a circuit diagram of a reactor.
- FIG. 1 shows a main circuit configuration related to the power conversion device 1 according to the first embodiment of the present invention.
- the DC voltage terminal N is grounded to the ground, or the potential is closer to the ground potential than the DC voltage terminal P.
- the power converter 1 in FIG. 1 has AC voltage terminals U, V, W and DC voltage terminals P, N.
- Each AC voltage terminal U, V, W and each DC voltage terminal P , N includes a converter cell series body in which one or more (1 to n) converter cells 10 are connected in series.
- a reactor 301 is provided between each AC voltage terminal U, V, W and the negative DC voltage terminal N.
- the reactor 301 does not necessarily have to be a reactor, and an inductor having an inductance component (for example, a deliberately long cable) can be substituted.
- the converter cell 10 provided between the AC voltage terminal U and the DC voltage terminal P is represented by 10 PU1 , 10 PU2,. 10 PUn
- the converter cell 10 provided between the AC voltage terminal W and the DC voltage terminal N is 10 NW1 , 10 NW2 ,..., 10 NWn .
- the converter cells are collectively referred to as a converter cell 10.
- a converter cell serial body for example, a converter cell serial body composed of converter cells 10 PU1 , 10 PU2 ,..., 10 PUn is described as a converter cell serial body 10 PU . .
- the reactor 301 may, for example, has a reactor which is provided between the AC voltage terminal U DC voltage converter series cell body 10 NU DC voltage terminal N between terminals N and reactor 301 U.
- the reactors 301 U , 301 V , and 301 W are collectively referred to as the reactor 301.
- Reactor 301 is the first inductance in the present invention.
- FIG. 2 (a) and FIG. 2 (b) show them.
- Converter cell 10 includes semiconductor switching elements 51 and 52 connected in series, free-wheeling diodes 53 and 54 connected in reverse parallel to semiconductor switching elements 51 and 52, and parallel to semiconductor switching elements 51 and 52 connected in series.
- the capacitor 55 is connected.
- the semiconductor switching elements 51 and 52 and the freewheeling diodes 53 and 54 are the semiconductor elements of the present invention.
- FIG. 2A the collector and emitter terminals of the semiconductor switching element 52 are connected to the output terminal of the converter cell 10.
- FIG. 2A the collector and emitter terminals of the semiconductor switching element 52 are connected to the output terminal of the converter cell 10.
- the semiconductor switching elements 51 and 52 are IGBTs (Insulated-Gate Bipolar Transistors), GCTs (Gate Commutated Turn-off Thyristors), MOSFETs (Metal-Oxide-Semiconductor Transistor-Effect Semiconductor-Semiconductor Transistor-Effect Semiconductors).
- the capacitor 55 is not limited to a capacitor, and may be an energy storage element such as an electric double layer capacitor.
- FIG. 2A when the semiconductor switching element 51 is turned on and the semiconductor switching element 52 is turned off, the output voltage of the converter cell 10 becomes substantially equal to the voltage of the capacitor 55, and the semiconductor switching element 51 is turned off.
- the semiconductor switching element 52 When the semiconductor switching element 52 is turned on, the output voltage of the converter cell is substantially zero.
- FIG. 2B shows that when the semiconductor switching element 51 is turned on and the semiconductor switching element 52 is turned off, the output voltage of the converter cell becomes substantially zero, the semiconductor switching element 51 is turned off, and the semiconductor switching element 52 is turned on. When turned on, the output voltage of the converter cell becomes substantially equal to the voltage of the capacitor 55.
- the converter cell 10 has been described as a two-level output, but a three-level output is also possible. In this case, multi-leveling is possible, and there is an effect that harmonics can be reduced and the number of converter cells 10 in series can be reduced.
- a known control method of a modular multilevel converter MMC
- a PWM control method of a modular multilevel converter described in Non-Patent Document 2 can be applied.
- Each converter cell 10 outputs an AC component voltage and a DC component voltage by turning on / off the semiconductor switching elements 51 and 52.
- the AC voltage component is responsible for power transfer to and from the power source and equipment connected to the AC voltage terminals U, V, and W.
- the average voltage per switching period of the voltages generated at the AC voltage terminals U, V, and W is given as a voltage command in the same manner as the PWM control of a general power converter.
- FIG. 3 is a diagram showing a U-phase current and voltage as an example of one phase of the main circuit in order to explain the operation of the power conversion device 1.
- the current flowing through the converter cell series 10 NU of NU1 , 10 NU2 ,..., 10 NUn is defined as I NU .
- the voltage output from the converter cell series 10 PU of the positive-side converter cells 10 PU1 , 10 PU2 ,..., 10 PUn is Vcp
- the negative-side converter cells 10 NU1 , 10 NU2 is Vcp
- the voltage output from the 10 NUn converter cell serial body 10 NU is Vcn
- the terminal voltage of the reactor 301 U is VL U
- the voltage between the positive electrode P and the negative electrode N is Vdc_com.
- the current Iac flowing through the AC voltage terminal in FIG. 3 is substantially only an AC component, and the AC voltage component of the voltage Vcp output from the positive converter cell series body 10 PU and the negative converter cell series. If the AC voltage component of the voltage Vcn output by the body 10 NU is a symmetrical waveform with opposite polarity, the current Iac is divided into approximately half each to the positive electrode side and the negative electrode side. That is, the alternating current component of the current I PU flowing through the converter cell series body 10 PU on the positive electrode side and the alternating current component of the current I NU flowing through the converter cell serial body 10 NU on the negative electrode side are of opposite polarity and substantially equal in magnitude. .
- the DC voltage components output from the converter cell series bodies 10 PU and 10 NU are three-phase and substantially the same zero-phase voltage. Therefore, the line voltage of the AC voltage terminals U, V, and W is a DC voltage. A component does not occur, and a direct current does not substantially flow through the alternating voltage terminals U, V, and W.
- the DC voltage component transmits and receives power to and from the power source and equipment connected to the DC voltage terminals P and N.
- the AC voltage component is canceled by the positive converter cell and the negative converter cell and hardly occurs.
- the direct current flowing through the converter cell 10 is controlled so that the voltage of the capacitor 55 constituting the converter cell 10 is adjusted to be substantially constant. In other words, control is performed so that a DC current flows so that the power exchanged by the AC component of the converter cell 10 and the power exchanged by the DC component cancel each other.
- the direct current flows through the path of the DC voltage terminal P ⁇ the converter cell series body on the positive electrode side ⁇ the converter cell series body on the negative electrode side ⁇ the reactor 301 ⁇ the DC voltage terminal N.
- the AC voltage terminal U will be described as follows: DC voltage terminal P ⁇ positive electrode side converter cell serial body 10 PU ⁇ negative electrode side converter cell serial body 10 NU ⁇ reactor 301 U ⁇ DC voltage terminal N Flowing. Therefore, in order to control the direct current, it is sufficient that at least one reactor or inductance component exists in the path through which the direct current flows.
- Non-Patent Documents 2 and 3 a reactor and an inductance component are not necessarily required on both the positive electrode side and the negative electrode side, and the power conversion device 1 of the first embodiment is not necessary.
- direct current control is possible only with the reactor 301 on the negative electrode side.
- the power conversion device 1 since the power conversion device 1 according to the first embodiment is provided with the reactor on the negative electrode side, the number of reactors can be reduced, and a small and lightweight power conversion device can be realized.
- a reactor 301 that is an inductance is illustrated only on the negative electrode side, but an inductance component for protecting a semiconductor element (for example, an anode reactor when GCT is applied), wiring, and the like are provided on the positive electrode side. Even if a small inductance exists, the effect of the present invention is not impaired. That is, the effect of the present invention can be found if the inductance value of the negative side inductance is larger than the inductance value of the positive side inductance.
- FIG. 4 shows a main circuit configuration diagram in which a reactor 302 that is a small inductance such as a wiring is added to the positive electrode side of the power conversion device 1. Similar to the reactor 301, the reactor 302 is a generic name of 302 U , 302 V , and 302 W. In addition, in order to distinguish from the power converter device 1 of FIG. The reactor 302 is the second inductance of the present invention.
- a power conversion device 3 that is another example of the first embodiment will be described with reference to FIG.
- the reactor 301 installed on the negative electrode side in the power conversion device 1 of FIG. 1 described above is installed as the reactor 303 on the positive electrode side. That is, the difference between the configuration of the power conversion device 3 and the configuration of the power conversion device 1 is the difference in the installation location of the reactor, and the configuration of the other converter cells and the converter cell series body are the same.
- a reactor provided between the converter cell series body 10 PU and the DC voltage terminal P between the AC voltage terminal U and the DC voltage terminal P is referred to as a reactor 303 U.
- the DC voltage terminal P is grounded to the ground potential, or the potential is closer to the ground potential than the DC voltage terminal N.
- the power conversion device 3 is different from the power conversion device 1 only in the installation location of the reactor, and the operation is the same as that of the power conversion device 1, and thus the description thereof is omitted. Since the power converter 3 is provided with the reactor on the positive electrode side, the number of reactors can be reduced, and a small and light power converter can be realized.
- the reactor 303 that is an inductance is illustrated only on the positive electrode side. However, even if an inductance component for protecting the semiconductor element and a small inductance such as a wiring exist on the negative electrode side, The effect of the invention is not impaired. That is, the effect of the present invention can be found if the inductance value of the positive-side inductance is larger than the inductance value of the negative-side inductance.
- FIG. 6 the same or corresponding parts as in FIG.
- the power conversion device 4 in FIG. 6 magnetically couples the three reactors 301 U , 301 V , and 301 W installed for each phase on the negative electrode side of the power conversion device 1 in FIG.
- This is a reactor 304.
- the x end of the reactor 304 is connected to the converter cell serial body 10 NU
- the y end of the reactor 304 is connected to the converter cell serial body 10 NV
- the z end of the reactor 304 is the converter cell. It is connected to the serial body 10 NW .
- the reactor 304 magnetically couples windings between xN, yN, and zN. Since the magnetic flux by the electric current which flows into each phase in the reactor 304 is reduced, the power converter device 4 can obtain the effect that the reactor can be downsized, and can be further downsized from the structural point of view. For this reason, compared with the power converter device 1, a further smaller and lighter power converter device can be realized.
- FIG. 7 the same or corresponding parts as those in FIGS. 1 and 5 are denoted by the same reference numerals.
- the power conversion device 5 in FIG. 7 magnetically couples the three reactors 303 U , 303 V , and 303 W installed for each phase on the positive electrode side of the power conversion device 3 in FIG.
- the reactor 305 is used.
- FIG. 7 the same or corresponding parts as those in FIGS. 1 and 5 are denoted by the same reference numerals.
- the power conversion device 5 in FIG. 7 magnetically couples the three reactors 303 U , 303 V , and 303 W installed for each phase on the positive electrode side of the power conversion device 3 in FIG.
- the reactor 305 is used.
- the x ′ end of the reactor 305 is connected to the converter cell serial body 10 PU
- the y ′ end of the reactor 305 is connected to the converter cell serial body 10 PV
- the z ′ end of the reactor 305 is It is connected to the converter cell serial body 10 PW .
- the reactor 305 magnetically couples windings between x′-P, between y′-P, and between z′-P. Since the magnetic flux due to the current flowing in each phase in the reactor 305 is reduced in the power conversion device 5, the effect of reducing the size of the reactor can be obtained, and the power conversion device 5 can be further reduced in size compared to a single reactor. For this reason, compared with the power converter device 3, a further smaller and lighter power converter device can be realized.
- a reactor used in a high-voltage and large-capacity power conversion device is generally a heavy object of several tons, it is difficult to ensure earthquake resistance when insulated with a insulator or the like.
- the reactor In the power conversion device 1 and the power conversion device 4, if the DC voltage terminal N on the side where the reactor is installed is grounded to the ground, or the potential is closer to the ground potential than the other DC voltage terminal P, the reactor is easily insulated. Therefore, it is easy to reduce the size of the insulator and to ensure the earthquake resistance.
- the power conversion device 3 and the power conversion device 5 as well if the DC voltage terminal P on the side where the reactor is installed is grounded to the ground or the potential is closer to the ground potential than the other DC voltage terminal N, the reactor is insulated. This makes it easier to reduce the size of the insulator and ensure earthquake resistance.
- one or more converter cells including a semiconductor element and a capacitor are connected in series between a three-phase AC voltage terminal and a DC voltage terminal (P, N).
- a reactor is connected in series with the converter cell series body between the DC voltage terminal and the AC voltage terminal at the lowest potential with respect to the ground. For this reason, a reactor can be reduced in size and can be installed in a place close to the ground potential, so that an insulation voltage can be reduced, insulation is facilitated, and earthquake resistance can be improved. Further, there are effects of improving durability and saving energy.
- the AC voltage terminal and the DC voltage terminal are described as actual terminals, but may be regarded as an AC input / output unit and a DC input / output unit.
- the AC voltage is described as a three-phase AC voltage. However, a single-phase AC voltage or an AC voltage of four or more phases may be used.
- FIG. The power conversion device according to the second embodiment has two power conversion devices according to the first embodiment (for example, the power conversion device 1 and the power conversion device 3), and the AC voltage terminals are connected in parallel via a transformer. The DC voltage terminals are connected in series.
- FIGS. 9 and 10 which are main circuit configuration diagrams of the power conversion device
- FIGS. 11 and 12 to 15 which are main circuit configuration diagrams of other embodiments. 16 and FIG. 17 which is a circuit diagram of the reactor.
- the main circuit structure of the power converter device 6 demonstrated after FIG. 9, 10 is represented. 11 and 12 show the main circuit configuration of the power conversion device 7, FIGS. 13 and 14 show the main circuit configuration of the power conversion device 8, and FIGS. 15 and 16 show the main circuit configuration of the power conversion device 8. Yes.
- FIGS. 9 and 10 the same or corresponding parts as those in FIGS. 1 and 5 are denoted by the same reference numerals.
- the AC voltage terminal U1 When the AC voltage terminal U1 is described as an example between the AC voltage terminals U1, V1, W1 and the DC voltage terminals P, M of the power converter 6, one or more (1 to n) converter cells 20 are provided. It has a converter cell series body in which a PU and one or more (1 to n) converter cells 20 MU are connected in series.
- a reactor 306 is provided between each AC voltage terminal U 1, V 1, W 1 and the DC voltage terminal M.
- the reactor 306 is a general term for 306 U , 306 V , and 306 W.
- the configuration between the AC voltage terminals U1, V1, and W1 and the DC voltage terminals P and M is the same as that of the power converter 1.
- the converter cell 10 is used in the power converter 1 but the converter cell 20 is used in the power converter 5. Moreover, although it was set as the reactor 301 in the power converter device 1, it is set as the reactor 306 in the power converter device 5.
- FIG. 1 the configuration and operation of the converter cell are the same, in order to facilitate explanation and understanding, the converter cell 10 is used in the power converter 1 but the converter cell 20 is used in the power converter 5. Moreover, although it was set as the reactor 301 in the power converter device 1, it is set as the reactor 306 in the power converter device 5. FIG.
- the AC voltage terminal U2 has a converter cell series body in which a cell 30 MU and one or more (1 to n) converter cells 30 NU are connected in series.
- a reactor 307 is provided between each AC voltage terminal U 2, V 2, W 2 and the DC voltage terminal M.
- the reactor 307 is a general term for 307 U , 307 V , and 307 W.
- the configuration between the AC voltage terminals U 2, V 2, W 2 and the DC voltage terminals M, N is the same as that of the power converter 3.
- FIG. Reactor 306 is the third inductance of the present invention
- reactor 307 is the fourth inductance of the present invention.
- the AC voltage terminals U1, V1, and W1 are connected to AC voltage terminals R, S, and T through a transformer 401.
- U2, V2, and W2 are connected to AC voltage terminals R, S, and T through a transformer 402.
- the DC voltage terminal N of the power converter 1 is connected to the DC voltage terminal P of the power converter 3 to form a neutral point M. That is, reactors 306 and 307 are provided on the neutral point M side.
- the power conversion device 6 combines the power conversion device 1 and the power conversion device 3 via the transformers 401 and 402, and is connected to the AC voltage terminals R, S, and T via the transformers 401 and 402.
- the converter cell of the main circuit that is, the control of the semiconductor switching elements constituting the converter cell can be controlled in the same manner as in the first embodiment. If transformers 401 and 402 have leakage inductance, an AC power source can be connected to AC voltage terminals R, S, and T.
- the power converter 6 can be operated as a power converter having a bipolar configuration on the DC side. That is, for example, when applied to DC transmission of ⁇ 500 kV, the DC voltage terminal P corresponds to +500 kV and the DC voltage terminal N corresponds to ⁇ 500 kV.
- the neutral point M may be grounded to the ground, or a substantially intermediate potential between the DC voltage terminals P and N may be grounded to the ground separately by grounding the capacitor without grounding. In either method, the neutral point M is substantially equal to the ground potential. Therefore, the power conversion device 6 can reduce the number of reactors, and since the potential for installing the reactor is close to the ground potential, it is easy to insulate, is small and lightweight, and realizes a power conversion device with excellent earthquake resistance. can do.
- the power conversion device 6 according to the second embodiment is provided with the reactor on the neutral point M side, the number of reactors can be reduced, and a small and lightweight power conversion device can be realized.
- the reactors 306 and 307 that are inductances are illustrated only on the neutral point M side, but inductance components for protecting semiconductor elements, wiring, and the like are provided on the positive electrode side and / or the negative electrode side. Even if a small inductance exists, the effect of the present invention is not impaired. That is, if the inductance value of the inductance on the neutral point M side is larger than the inductance value of the inductance on the positive electrode side and the negative electrode side, the effect of the present invention can be found.
- 11 and 12 are main circuit configuration diagrams in which a reactor 308 that is a small inductance such as a wiring is added to the positive electrode side of the power conversion device 6 and a reactor 309 that is a small inductance such as a wiring is added to the negative electrode side.
- the reactor 308 is a generic name for 308 U , 308 V , and 308 W
- the reactor 309 is a generic name for 309 U , 309 V , and 309 W.
- the reactor 308 is the fifth inductance of the present invention
- the reactor 309 is the sixth inductance of the present invention.
- FIGS. 13 and 14 magnetically couples the three reactors 306 U , 306 V , and 306 W installed for each phase on the neutral point side of the power conversion device 6 of FIGS.
- the three reactors 307 U , 307 V , and 307 W that are installed for each phase on the neutral point side are magnetically coupled to form one reactor 311. It is a thing.
- the reactor 310 of the power converter 8 is equivalent to the reactor 304 of the power converter 4 of FIG.
- the reactor 311 of the power converter 8 is equivalent to the reactor 305 of the power converter 5 of FIG. Since the magnetic flux due to the current flowing through each phase in the reactors 310 and 311 is reduced in the power conversion device 8, the effect of reducing the size of the reactor can be obtained, and the size can be further reduced as compared with a single reactor. it can. For this reason, compared with the power converter device 6, a smaller and lighter power converter device can be realized.
- 15 and 16 includes a total of six reactors 306 U , 306 V , 306 W, 307 U , 307 V , installed on the neutral point side of the power converter 6 in FIGS. 307 W is combined into one reactor 312.
- the X1 end of the reactor 312 is connected to the converter cell serial body 20 MU
- the Y1 end is connected to the converter cell serial body 20 MV
- the Z1 end is connected to the converter cell serial body 20 MW .
- the X2 end of the reactor 312 is connected to the converter cell serial body 30 MU
- the Y2 end is connected to the converter cell serial body 30 MV
- the Z2 end is connected to the converter cell serial body 30 MW .
- Reactor 312 magnetically couples windings between X1-M, between Y1-M, between Z1-M, between X2-M, between Y2-M, and between Z2-M.
- the magnetic flux due to the current flowing through each phase in the reactor 312 is reduced in the power converter 9, the effect of reducing the size of the reactor can be obtained, and the power converter 9 can be further reduced in size compared to a single reactor. For this reason, compared with the power converter device 6, a smaller and lighter power converter device can be realized.
- all windings between X1-M, Y1-M, Z1-M, X2-M, Y2-M, and Z2-M are magnetically magnetic. Although coupled, it is also possible to magnetically couple only the positive side inductance and the negative side inductance across the neutral point. Specifically, the reactor 312 is not magnetically coupled between X1-M, Y1-M, and Z1-M, but is magnetically coupled between X2-M, Y2-M, and Z2-M. I won't let you. X1-M and X2-M are coupled, Y1-M and Y2-M are coupled, and Z1-M and Z2-M are coupled.
- the power conversion device includes the two power conversion devices (for example, the power conversion device 1 and the power conversion device 3) of the first embodiment, and the AC voltage terminal includes a transformer. And the DC voltage terminals are connected in series. And between the first AC voltage terminal and the positive voltage terminal, between the first AC voltage terminal and the neutral point, between the second AC voltage terminal and the neutral point, the second One or more converter cells are connected in series between the AC voltage terminal and the negative voltage terminal, and the converter cell series body is respectively connected between the first and second AC voltage terminals and the neutral point. It was set as the structure which connects a reactor in series.
- the AC voltage is described as a three-phase AC voltage, but it may be a single-phase AC voltage or an AC voltage of four or more phases.
- the semiconductor switching element and the free wheel diode element are formed of silicon, but may be formed of a wide band gap semiconductor having a larger band gap than silicon.
- the wide band gap semiconductor include silicon carbide, a gallium nitride-based material, and diamond.
- the present invention relates to conversion of AC power to DC power, or conversion of DC power to AC power, and can be widely applied to power conversion devices.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Rectifiers (AREA)
Abstract
Description
非特許文献1の電力変換装置の回路構成に、交流電圧端子U、V、Wと直流電圧端子Pとの間、および交流電圧端子U、V、Wと直流電圧端子Nとの間にリアクトルを追加したマルチレベル変換器が提案されている(例えば、非特許文献2)。さらに、正極側に接続されたリアクトルと負極側に接続されたリアクトルとを磁気的に結合させたリアクトルを有するマルチレベル変換器が提案されている(例えば、非特許文献3)。
実施の形態1は、3相交流電圧端子と直流電圧端子(P、N)との間に半導体素子とキャパシタから成る1個以上の変換器セルを直列に接続し、さらに大地に対して最も低い電位にある直流電圧端子と交流電圧端子との間に、変換器セル直列体と直列にリアクトルを接続した構成とした電力変換装置に関するものである。
以下、本願発明の実施の形態1に係る電力変換装置1の構成、動作について、電力変換装置の主回路構成図である図1、変換器セルの回路図である図2、主回路の1相分の電流、電圧説明図である図3、他の実施例の主回路構成図である図4~図7、リアクトルの回路図である図8に基づいて説明する。
図1の電力変換装置1は、交流電圧端子U、V、Wと、直流電圧端子P、Nとを有しており、各々の交流電圧端子U、V、Wと、各々の直流電圧端子P、Nとの間には、1個以上(1~n個)の変換器セル10が直列に接続された変換器セル直列体を有する。また、各々の交流電圧端子U、V、Wと、負極側の直流電圧端子Nとの間にはリアクトル301を有する。なお、リアクトル301は必ずしもリアクトルでなくてもよく、インダクタンス成分を有するもの(例えば、意図的に長いケーブルなど)でも代用可能である。
また、リアクトル301についても、例えば、交流電圧端子Uと直流電圧端子Nの間で変換器セル直列体10NUと直流電圧端子Nの間に設けられたリアクトルをリアクトル301Uとしている。以下、リアクトル301U、301V、301Wをまとめていう場合は、リアクトル301と記載する。
リアクトル301が、この発明における第1のインダクタンスである。
変換器セル10は、直列接続した半導体スイッチング素子51、52と、この半導体スイッチング素子51、52と逆並列に接続される還流ダイオード53、54と、直列接続した半導体スイッチング素子51、52に並列に接続したキャパシタ55とで構成される。
半導体スイッチング素子51、52と還流ダイオード53、54が本発明の半導体素子である。
図2(a)では、半導体スイッチング素子52のコレクタとエミッタ端子が変換器セル10の出力端子に接続されている。
図2(b)では、半導体スイッチング素子51のコレクタとエミッタ端子が変換器セル10の出力端子に接続されている。
なお、半導体スイッチング素子51、52には、IGBT(Insulated-Gate Bipolar Transistor)やGCT(Gate Commutated Turn-off thyristor)、MOSFET(Metal-Oxide-Semiconductor Field-Effect Transistor)などの半導体スイッチング素子が使用される。
また、キャパシタ55は、キャパシタに限らず、電気2重層キャパシタなどのエネルギー蓄積要素であればよい。
図2(a)では、半導体スイッチング素子51がオンし、半導体スイッチング素子52がオフした場合は、変換器セル10の出力電圧はキャパシタ55の電圧と略等しくなり、半導体スイッチング素子51がオフし、半導体スイッチング素子52がオンした場合は、変換器セルの出力電圧は略零となる。
一方、図2(b)は、半導体スイッチング素子51がオンし、半導体スイッチング素子52がオフした場合に変換器セルの出力電圧は略零となり、半導体スイッチング素子51がオフし、半導体スイッチング素子52がオンした場合に変換器セルの出力電圧はキャパシタ55の電圧と略等しくなる。
電力変換装置1の制御には、モジュラー・マルチレベル変換器(MMC:Modular Multilevel Converter)の公知の制御方式を適用できる。例えば、非特許文献2に記載の「モジュラー・マルチレベル変換器のPWM制御方法」が適用できる。
交流電圧端子Uに流れる電流をIac、正極側の変換器セル10PU1、10PU2、・・・、10PUnの変換器セル直列体10PUを流れる電流をIPU、負極側の変換器セル10NU1、10NU2、・・・、10NUnの変換器セル直列体10NUを流れる電流をINUとする。また、正極側の変換器セル10PU1、10PU2、・・・、10PUnの変換器セル直列体10PUが出力する電圧をVcp、負極側の変換器セル10NU1、10NU2、・・・、10NUnの変換器セル直列体10NUが出力する電圧をVcn、リアクトル301Uの端子電圧をVLU、正極Pと負極N間の電圧をVdc_comとする。
なお、変換器セル直列体10PUおよび10NUが出力する直流電圧成分は、三相でほぼ同一の零相電圧であることから、交流電圧端子U、V、Wの線間電圧には直流電圧成分が生じず、交流電圧端子U、V、Wには直流電流は略流れない。
一方、直流電圧成分は、直流電圧端子P、Nに接続される電源や機器との電力の授受を行う。直流電圧端子P、Nには、交流電圧成分は正極側変換器セルと負極側変換器セルとでキャンセルされてほとんど生じない。
図2に示すように変換器セル10を構成するキャパシタ55の電圧を略一定に調整するように、変換器セル10を流れる直流電流が制御される。言い換えると、変換器セル10の交流成分によって授受する電力と、直流成分によって授受する電力とが互いに相殺するような直流電流を流すように制御が行われる。
したがって、直流電流を制御するには、直流電流が流れる経路に少なくとも1つのリアクトルやインダクタンス成分が存在していればよい。このため、非特許文献2、3で開示された電力変換装置のように、必ずしも正極側と負極側の両方にリアクトルやインダクタンス成分が必要ではなく、本実施の形態1の電力変換装置1のように負極側のリアクトル301のみで直流電流制御が可能である。
電力変換装置1では、負極側にのみインダクタンスであるリアクトル301を図示しているが、正極側に、半導体素子を保護するためのインダクタンス成分(例えば、GCT適用時のアノードリアクトル)や、配線などの小さいインダクタンスが存在していても、本発明の効果は損なわれない。すなわち、負極側のインダクタンスのインダクタンス値が正極側のインダクタンスのインダクタンス値よりも大きければ、本発明の効果を見出すことができる。
電力変換装置1の正極側に、配線などの小さいインダクタンスであるリアクトル302を追加した主回路構成図を図4に示す。リアクトル301と同様に、リアクトル302は、302U、302V、302Wの総称である。
なお、図1の電力変換装置1と区別するため、電力変換装置2としている。また、リアクトル302が本発明の第2のインダクタンスである。
図5において、図1と同一あるいは相当部分には、同一の符号を付している。
図5の電力変換装置3は、上記で説明した図1の電力変換装置1では、負極側に設置していたリアクトル301を、正極側にリアクトル303として設置したものである。すなわち、電力変換装置3の構成と電力変換装置1の構成の違いは、リアクトルの設置場所の違いであり、その他の変換器セルおよびの変換器セル直列体の構成は同じである。
ここで、例えば、交流電圧端子Uと直流電圧端子Pの間で変換器セル直列体10PUと直流電圧端子Pの間に設けられたリアクトルをリアクトル303Uとしている。
なお、電力変換装置3では、直流電圧端子Pを大地電位に接地、もしく直流電圧端子Nよりも大地電位に近い電位とすることを想定している。
電力変換装置1と同じであるため、説明は省略する。
電力変換装置3は、正極側にリアクトルを設けているので、リアクトルの台数を削減でき、小型・軽量な電力変換装置を実現できる。
図6において、図1と同一あるいは相当部分には、同一の符号を付している。
図6の電力変換装置4は、図1の電力変換装置1の負極側に相毎に設置していた3台のリアクトル301U、301V、301Wを磁気的に結合させて、1台のリアクトル304としたものである。
図8(a)において、リアクトル304のx端は変換器セル直列体10NUに接続され、リアクトル304のy端は変換器セル直列体10NVに接続され、リアクトル304のz端は変換器セル直列体10NWに接続されている。リアクトル304は、x-N間、y-N間、z-N間の巻線を磁気的に結合させている。
電力変換装置4は、リアクトル304において各相に流れる電流による磁束が低減されるため、リアクトルを小型化できる効果が得られ、構造的にリアクトルを1台にするよりもさらに小型化できる。このため、電力変換装置1と比較して、さらに小型・軽量な電力変換装置を実現できる。
図7において、図1、図5と同一あるいは相当部分には、同一の符号を付している。
図7の電力変換装置5は、図5の電力変換装置3の正極側に相毎に設置していた3台のリアクトル303U、303V、303Wを磁気的に結合させて、1台のリアクトル305としたものである。
図8(b)において、リアクトル305のx’端は変換器セル直列体10PUに接続され、リアクトル305のy’端は変換器セル直列体10PVに接続され、リアクトル305のz’端は変換器セル直列体10PWに接続されている。リアクトル305は、x’-P間、y’-P間、z’-P間の巻線を磁気的に結合させている。
電力変換装置5は、リアクトル305において各相に流れる電流による磁束が低減されるため、リアクトルを小型化できる効果が得られ、構造的にリアクトルを1台にするよりもさらに小型化できる。このため、電力変換装置3と比較して、さらに小型・軽量な電力変換装置を実現できる。
電力変換装置1および電力変換装置4において、リアクトルを設置した側の直流電圧端子Nを大地に接地、もしくは他方の直流電圧端子Pよりも大地電位に近い電位とすれば、リアクトルの絶縁が容易になり、絶縁体の小型化や、耐震性の確保が容易になる。
また、電力変換装置3および電力変換装置5においても、リアクトルを設置した側の直流電圧端子Pを大地に接地、もしくは他方の直流電圧端子Nよりも大地電位に近い電位とすれば、リアクトルの絶縁が容易になり、絶縁体の小型化や、耐震性の確保が容易になる。
なお、実施の形態1の説明では、交流電圧端子および直流電圧端子については、実体としての端子(Terminal)として記載しているが、交流入出力部および直流入出力部として捉えても良い。
また、実施の形態1では交流電圧は3相交流電圧として説明したが、単相交流電圧でも4相以上の交流電圧でも良い。
実施の形態2の電力変換装置は、実施の形態1の2台の電力変換装置(例えば、電力変換装置1と電力変換装置3)を、各交流電圧端子は変圧器を介して並列に接続し、各直流電圧端子は直列に接続する構成としたものである。
以下、実施の形態2の電力変換装置の構成、動作について、電力変換装置の主回路構成図である図9、10、他の実施例の主回路構成図である図11、12~図15、16、リアクトルの回路図である図17に基づいて説明する。
なお、図9、10で以降説明する電力変換装置6の主回路構成を表している。また、図11、12で電力変換装置7の主回路構成を表し、図13、14で電力変換装置8の主回路構成を表し、図15、16で電力変換装置8の主回路構成を表している。
ただし、変換器セルの構成、動作は同じであるが、説明および理解を容易にするために、電力変換装置1では変換器セル10としていたが、電力変換装置5では変換器セル20としている。また、電力変換装置1ではリアクトル301としていたが、電力変換装置5ではリアクトル306としている。
ただし、変換器セルの構成、動作は同じであるが、説明および理解を容易にするために、電力変換装置3では変換器セル10としていたが、電力変換装置6では変換器セル30としている。また、電力変換装置3ではリアクトル303としていたが、電力変換装置6ではリアクトル307としている。
なお、リアクトル306が本願発明の第3のインダクタンスであり、リアクトル307が本願発明の第4のインダクタンスである。
電力変換装置1の直流電圧端子Nは、電力変換装置3の直流電圧端子Pと接続され、中性点Mを形成する。すなわち、中性点Mの側にリアクトル306と307を有する。
なお、変圧器401および402に漏れインダクタンスを有していれば、交流電圧端子R、S、Tに交流電源を接続することができる。
どちらの方法でも、中性点Mは大地電位に略等しくなる。よって、電力変換装置6は、リアクトルの台数を削減できるほかに、リアクトルを設置する電位が大地電位に近いため、絶縁が容易であり、小型・軽量で、耐震性に優れた電力変換装置を実現することができる。
電力変換装置6では、中性点M側にのみインダクタンスであるリアクトル306、307を図示しているが、正極側および/または負極側に、半導体素子を保護するためのインダクタンス成分や、配線などの小さいインダクタンスが存在していても、本発明の効果は損なわれない。すなわち、中性点M側のインダクタンスのインダクタンス値が正極側、負極側のインダクタンスのインダクタンス値よりも大きければ、本発明の効果を見出すことができる。
電力変換装置6の正極側に配線などの小さいインダクタンスであるリアクトル308を追加し、負極側に配線などの小さいインダクタンスであるリアクトル309を追加した主回路構成図を図11、12に示す。なお、リアクトル308は、308U、308V、308Wの総称であり、リアクトル309は、309U、309V、309Wの総称である。
なお、図9、10の電力変換装置6と区別するため、電力変換装置7としている。また、リアクトル308が本発明の第5のインダクタンスであり、リアクトル309が本発明の第6のインダクタンスである。
図13、14において、図9、10と同一あるいは相当部分には、同一の符号を付している。
図13、14の電力変換装置8は、図9、10の電力変換装置6の中性点側に相毎に設置していた3台のリアクトル306U、306V、306Wを磁気的に結合させて、1台のリアクトル310とし、同様に中性点側に相毎に設置していた3台のリアクトル307U、307V、307Wを磁気的に結合させて、1台のリアクトル311としたものである。
ここで、電力変換装置8のリアクトル310は、図6の電力変換装置4のリアクトル304と同等であり、電力変換装置8のリアクトル311は図7の電力変換装置5のリアクトル305と同等である。
電力変換装置8は、リアクトル310および311において各相に流れる電流による磁束が低減されるため、リアクトルを小型化できる効果が得られ、構造的にリアクトルを各々1台にするよりも、さらに小型化できる。このため、電力変換装置6と比較して、さらに小型・軽量な電力変換装置を実現できる。
図15、16において、図9、10と同一あるいは相当部分には、同一の符号を付している。
図15、16の電力変換装置9は、図9、10の電力変換装置6の中性点側に設置していた計6台のリアクトル306U、306V、306W、307U、307V、307Wをまとめて1台のリアクトル312としたものである。
図17において、リアクトル312のX1端は変換器セル直列体20MUに接続され、Y1端は変換器セル直列体20MVに接続され、Z1端は変換器セル直列体20MWに接続されている。また、リアクトル312のX2端は変換器セル直列体30MUに接続され、Y2端は変換器セル直列体30MVに接続され、Z2端は変換器セル直列体30MWに接続されている。
そして、リアクトル312は、X1-M間、Y1-M間、Z1-M間、X2-M間、Y2-M間、Z2-M間の巻線を磁気的に結合させている。
具体的には、リアクトル312のX1-M間とY1-M間とZ1-M間とは磁気的に結合させず、X2-M間とY2-M間とZ2-M間とも磁気的に結合させない。X1-M間とX2-M間とを結合させ、Y1-M間とY2-M間とを結合させ、Z1-M間とZ2-M間とを結合させる。
なお、実施の形態2では交流電圧は3相交流電圧として説明したが、単相交流電圧でも4相以上の交流電圧でも良い。
ワイドバンドギャップ半導体を使用すると、半導体素子の高耐圧化が可能なため、変換器セルの直列台数を低減できる。さらには、半導体スイッチングの高速化が可能なため、高調波成分がより小さい入力電流や出力電圧を得ることが可能である。
Claims (18)
- 交流電圧端子と、直流電圧端子とを有し、
前記交流電圧端子と前記直流電圧端子との間に1以上の変換器セルが直列に接続された変換器セル直列体を有し、
前記変換器セルは半導体素子とキャパシタを備え、
前記直流電圧端子の内、大地に対して最も低い電位にある前記直流電圧端子と前記交流電圧端子との間に、前記変換器セル直列体と直列に接続される第1のインダクタンスを有する電力変換装置。 - 前記直流電圧端子の内、大地に対して高電位にある前記直流電圧端子と前記交流電圧端子との間に、インダクタンスを有さない請求項1に記載の電力変換装置。
- 前記直流電圧端子の内、大地に対して高電位にある前記直流電圧端子と前記交流電圧端子との間に、さらに前記変換器セル直列体と直列に接続された前記第1のインダクタンスよりインダクタンス値が小さい第2のインダクタンスを有する請求項1に記載の電力変換装置。
- 複数相を有する電力変換装置であって、前記複数相の各相に前記交流電圧端子、前記変換器セル直列体、および前記第1のインダクタンスを有し、
前記各相の前記第1のインダクタンスは、互いに磁気的に結合されている請求項1から請求項3のいずれか1項に記載の電力変換装置。 - 大地に対して最も低い電位にある前記直流電圧端子が、大地に接地されている請求項1から請求項3のいずれか1項に記載の電力変換装置。
- 大地に対して最も低い電位にある前記直流電圧端子が、大地に接地されている請求項4に記載の電力変換装置。
- 前記変換器セルが備える前記半導体素子は、珪素に比べてバンドギャップが大きいワイドバンドギャップ半導体により形成されている請求項1から請求項3のいずれか1項に記載の電力変換装置。
- 前記ワイドバンドギャップ半導体は、炭化珪素、窒化ガリウム系材料またはダイヤモンドである請求項7に記載の電力変換装置。
- 第1の交流電圧端子と、第2の交流電圧端子と、正極の直流電圧端子と、負極の直流電圧端子と、前記正極と負極の直流電圧端子の中性点とを有し、
前記第1の交流電圧端子と前記正極の直流電圧端子との間と、
前記第1の交流電圧端子と前記中性点との間と、
前記第2の交流電圧端子と前記中性点との間と、
前記第2の交流電圧端子と前記負極の直流電圧端子との間に、
それぞれ1以上の変換器セルが直列に接続された変換器セル直列体を有し、
前記変換器セルは半導体素子とキャパシタを備え、
前記第1の交流電圧端子と前記中性点との間に、前記変換器セル直列体と直列に接続される第3のインダクタンスを有し、
前記第2の交流電圧端子と前記中性点との間に、前記変換器セル直列体と直列に接続される第4のインダクタンスを有する電力変換装置。 - 前記第1の交流電圧端子と前記正極の直流電圧端子との間に、インダクタンスを有さず、
前記第2の交流電圧端子と前記負極の直流電圧端子との間に、インダクタンスを有さない
請求項9に記載の電力変換装置。 - 前記第1の交流電圧端子と前記正極の直流電圧端子との間に、
さらに前記変換器セル直列体と直列に接続された前記第3のインダクタンスよりインダクタンス値が小さい第5のインダクタンスを有し、
前記第2の交流電圧端子と前記負極の直流電圧端子との間に、
さらに前記変換器セル直列体と直列に接続された前記第4のインダクタンスよりインダクタンス値が小さい第6のインダクタンスを有する請求項9に記載の電力変換装置。 - 前記中性点は、他の前記交流電圧端子および前記正極、負極の直流電圧端子よりも大地に対して最も近い電位にある請求項9から請求項11のいずれか1項に記載の電力変換装置。
- 前記第3のインダクタンスと前記第4のインダクタンスは、前記中性点をはさんで互いに磁気的に結合されている請求項9から請求項11のいずれか1項に記載の電力変換装置。
- 前記第3のインダクタンスと前記第4のインダクタンスは、前記中性点をはさんで互いに磁気的に結合されている請求項12に記載の電力変換装置。
- 複数相を有する電力変換装置であって、前記複数相の各相に前記第1の交流電圧端子、第2の交流電圧端子、前記変換器セル直列体、前記第3のインダクタンス、および前記第4のインダクタンスを有し、
前記第3のインダクタンスおよび前記第4のインダクタンスは、それぞれ各相が互いに磁気的に結合されている請求項9から請求項11のいずれか1項に記載の電力変換装置。 - 前記第1の交流電圧端子と、前記第2の交流電圧端子とが、1台以上の変圧器を介して、互いに並列に接続される請求項9から請求項11のいずれか1項に記載の電力変換装置。
- 前記変換器セルが備える前記半導体素子は、珪素に比べてバンドギャップが大きいワイドバンドギャップ半導体により形成されている請求項9から請求項11のいずれか1項に記載の電力変換装置。
- 前記ワイドバンドギャップ半導体は、炭化珪素、窒化ガリウム系材料またはダイヤモンドである請求項17に記載の電力変換装置。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2014524757A JP5792903B2 (ja) | 2012-07-11 | 2013-07-02 | 電力変換装置 |
EP13817638.3A EP2874301B1 (en) | 2012-07-11 | 2013-07-02 | Electrical power converter |
US14/412,524 US9780685B2 (en) | 2012-07-11 | 2013-07-02 | Electrical power converter with a converter cell series unit |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012-155117 | 2012-07-11 | ||
JP2012155117 | 2012-07-11 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2014010474A1 true WO2014010474A1 (ja) | 2014-01-16 |
Family
ID=49915935
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2013/068175 WO2014010474A1 (ja) | 2012-07-11 | 2013-07-02 | 電力変換装置 |
Country Status (4)
Country | Link |
---|---|
US (1) | US9780685B2 (ja) |
EP (1) | EP2874301B1 (ja) |
JP (1) | JP5792903B2 (ja) |
WO (1) | WO2014010474A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5868561B1 (ja) * | 2015-04-06 | 2016-02-24 | 三菱電機株式会社 | 電力変換装置 |
WO2019156192A1 (ja) * | 2018-02-07 | 2019-08-15 | 国立大学法人東北大学 | 電力変換装置、発電システム、モータドライブシステム及び電力連系システム |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9960709B2 (en) * | 2015-03-17 | 2018-05-01 | Mitsubishi Electric Corporation | Power conversion device |
DE102015121226A1 (de) * | 2015-12-07 | 2017-06-08 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Umrichter, Elektrisches Polyphasensystem und Verfahren |
DE102017124126B4 (de) | 2017-10-17 | 2019-05-09 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Umrichter, elektrisches Polyphasen-System und Verfahren zum effizienten Leistungsaustausch |
CN114342209A (zh) | 2019-09-13 | 2022-04-12 | 米沃奇电动工具公司 | 具有宽带隙半导体的功率转换器 |
JP7203249B2 (ja) * | 2019-12-13 | 2023-01-12 | 三菱電機株式会社 | 電力変換装置 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04325872A (ja) * | 1991-04-26 | 1992-11-16 | Mitsubishi Electric Corp | 電力変換装置 |
JP2010512135A (ja) * | 2006-12-08 | 2010-04-15 | シーメンス アクチエンゲゼルシヤフト | 電圧形インバータの直流側短絡を制御するための半導体保護素子 |
JP2011024377A (ja) * | 2009-07-17 | 2011-02-03 | Toshiba Carrier Corp | 圧縮機駆動装置および冷凍サイクル装置 |
JP2012044839A (ja) * | 2010-08-23 | 2012-03-01 | Tokyo Institute Of Technology | 電力変換器 |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0640742B2 (ja) * | 1986-05-19 | 1994-05-25 | 三菱電機株式会社 | コンバ−タ装置 |
ES2369291T3 (es) | 2006-12-08 | 2011-11-29 | Siemens Aktiengesellschaft | Dispositivo para la transformación de una corriente eléctrica. |
WO2010145689A1 (en) * | 2009-06-15 | 2010-12-23 | Areva T&D Uk Limited | Converter |
JP2011010404A (ja) * | 2009-06-24 | 2011-01-13 | Hitachi Ltd | 電力変換器およびそれを用いた電動機駆動装置、輸送装置 |
EP2449668A1 (en) * | 2009-07-02 | 2012-05-09 | ABB Technology AG | Power converter with multi-level voltage output and harmonics compensator |
CN102577072B (zh) * | 2009-10-06 | 2015-05-27 | Abb研究有限公司 | 改进型电压源转换器结构 |
JP5378274B2 (ja) * | 2010-03-15 | 2013-12-25 | 株式会社日立製作所 | 電力変換装置 |
WO2012000545A1 (en) * | 2010-06-30 | 2012-01-05 | Abb Technology Ag | An hvdc transmission system, an hvdc station and a method of operating an hvdc station |
US9065328B2 (en) * | 2011-11-16 | 2015-06-23 | Abb Technology Ag | AC/DC multicell power converter for dual terminal HVDC connection |
WO2013149633A1 (en) * | 2012-03-20 | 2013-10-10 | Abb Technology Ltd | A power converter |
WO2013185825A1 (en) * | 2012-06-14 | 2013-12-19 | Abb Technology Ltd | Multiline hvdc station with mmc and csc inputs |
-
2013
- 2013-07-02 US US14/412,524 patent/US9780685B2/en active Active
- 2013-07-02 EP EP13817638.3A patent/EP2874301B1/en active Active
- 2013-07-02 WO PCT/JP2013/068175 patent/WO2014010474A1/ja active Application Filing
- 2013-07-02 JP JP2014524757A patent/JP5792903B2/ja active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04325872A (ja) * | 1991-04-26 | 1992-11-16 | Mitsubishi Electric Corp | 電力変換装置 |
JP2010512135A (ja) * | 2006-12-08 | 2010-04-15 | シーメンス アクチエンゲゼルシヤフト | 電圧形インバータの直流側短絡を制御するための半導体保護素子 |
JP2011024377A (ja) * | 2009-07-17 | 2011-02-03 | Toshiba Carrier Corp | 圧縮機駆動装置および冷凍サイクル装置 |
JP2012044839A (ja) * | 2010-08-23 | 2012-03-01 | Tokyo Institute Of Technology | 電力変換器 |
Non-Patent Citations (3)
Title |
---|
A. LESNICAR; R. MARQUARDT: "An Innovative Modular Multilevel Converter Topology Suitable for a Wide Power Range", POWER TECH CONFERENCE PROCEEDINGS, vol. 3, 2003, XP055079911, DOI: doi:10.1109/PTC.2003.1304403 |
MAKOTO HAGIWARA; HIROFUMI AKAGI: "PWM Control and Experiment of Modular Multilevel Converters (MMC", IEEJ TRANSACTIONS D, vol. 128, no. 7, 2008, pages 957 - 965, XP055185989, DOI: doi:10.1541/ieejias.128.957 |
MAKOTO HAGIWARA; KAZUTOSHI NISHIMURA; HIROFUMI AKAGI: "A Medium-Voltage Motor Drive with a Modular Multilevel PWM Inverter, Part I: Experimental Verification by a 400-V 15-kW Downscaled Model", IEEJ TRANSACTIONS D, vol. 130, no. 4, 2010, pages 544 - 551 |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5868561B1 (ja) * | 2015-04-06 | 2016-02-24 | 三菱電機株式会社 | 電力変換装置 |
WO2016162915A1 (ja) * | 2015-04-06 | 2016-10-13 | 三菱電機株式会社 | 電力変換装置 |
US10389268B2 (en) | 2015-04-06 | 2019-08-20 | Mitsubishi Electric Corporation | AC-DC power conversion device including helically cascaded unit cells |
WO2019156192A1 (ja) * | 2018-02-07 | 2019-08-15 | 国立大学法人東北大学 | 電力変換装置、発電システム、モータドライブシステム及び電力連系システム |
JPWO2019156192A1 (ja) * | 2018-02-07 | 2021-01-28 | 国立大学法人東北大学 | 電力変換装置、発電システム、モータドライブシステム及び電力連系システム |
JP7177500B2 (ja) | 2018-02-07 | 2022-11-24 | 国立大学法人東北大学 | 電力変換装置、発電システム、モータドライブシステム及び電力連系システム |
Also Published As
Publication number | Publication date |
---|---|
JPWO2014010474A1 (ja) | 2016-06-23 |
US9780685B2 (en) | 2017-10-03 |
EP2874301A1 (en) | 2015-05-20 |
EP2874301A4 (en) | 2017-03-01 |
US20150188447A1 (en) | 2015-07-02 |
EP2874301B1 (en) | 2018-10-10 |
JP5792903B2 (ja) | 2015-10-14 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5792903B2 (ja) | 電力変換装置 | |
Wang et al. | Overview of silicon carbide technology: Device, converter, system, and application | |
US11962235B2 (en) | Modular multi-level DC/DC converter with current-shaping | |
Peng | A generalized multilevel inverter topology with self voltage balancing | |
CN112868172B (zh) | 三电平功率转换系统和方法 | |
Sun et al. | Topology and modulation for a new multilevel diode-clamped matrix converter | |
JP2015002677A (ja) | マルチレベルインバータ | |
Salmi et al. | A novel transformerless inverter topology without zero-crossing distortion | |
WO2012041020A1 (zh) | 单相五电平功率变换器 | |
Kumar et al. | A quad two-level inverter configuration for four-pole induction-motor drive with single DC link | |
Tripathi et al. | MVDC microgrids enabled by 15kV SiC IGBT based flexible three phase dual active bridge isolated DC-DC converter | |
Oliveira et al. | A two-stage AC/DC SST based on modular multilevel converterfeasible to AC railway systems | |
Zheng et al. | New modulation and impact of transformer leakage inductance on current-source solid-state transformer | |
Teixeira et al. | Topologically reduced multilevel converters using complementary unidirectional phase-legs | |
JP7177500B2 (ja) | 電力変換装置、発電システム、モータドライブシステム及び電力連系システム | |
Suresh et al. | Simulation of Z-source inverter using maximum boost control PWM technique | |
Nasir et al. | A review of power converter topologies with medium/high frequency transformers for grid interconnection systems | |
Dahmen et al. | Reduced capacitor size and on-state losses in advanced mmc submodule topologies | |
Iyer et al. | Multi-level converter to interface low voltage dc to 3-phase high voltage grid with medium frequency transformer isolation | |
Hou et al. | Topologies and operations of hybrid-type DC–DC converters interfacing DC-current bus and DC-voltage bus | |
Kasper et al. | Concepts and matching power semiconductor devices for compact on-board chargers | |
US20230048596A1 (en) | Bi-Directional Medium Voltage to Low Voltage Converter Topology | |
CN215498758U (zh) | 一种混合型地铁牵引双向供电装置 | |
Dujic et al. | Direct Current Transformer for MVDC Applications | |
Charrak | Investigation on Multi-Phase Zsource Inverter |
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: 13817638 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2014524757 Country of ref document: JP Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 14412524 Country of ref document: US |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2013817638 Country of ref document: EP |
|
NENP | Non-entry into the national phase |
Ref country code: DE |