JP2019201510A - Electric power conversion system - Google Patents

Abstract

To provide an electric power conversion system in which unbalance of currents flowing through semiconductor elements connected in parallel is reduced.SOLUTION: An electric power conversion system 10 comprises a first set of a first DC terminal 11p, a second DC terminal 11n, a first AC terminal 12a, a second AC terminal 12b, and a first set of a first phase conversion part 21 electrically connected between the first and second DC terminal 11p, 11n, and electrically connected with the first AC terminal 12a, and a second phase conversion part 22 placed adjacently to the first phase conversion part 21, electrically connected between the first and second DC terminal 11p, 11n, and electrically connected with the second AC terminal 12b, and a second set of a third phase conversion part electrically connected in parallel with the first phase conversion part 21, and a fourth phase conversion part located adjacently to the third phase conversion part and electrically connected in parallel with the second phase conversion part 22. The first phase conversion part 21, the second phase conversion part 22, the third phase conversion part and the fourth phase conversion part are placed in the first direction X.SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to a power conversion apparatus.

  In a power conversion device that performs AC / DC conversion, a plurality of semiconductor elements may be connected in parallel for the purpose of increasing capacity. When connecting a plurality of semiconductor elements in parallel, adjusting the wiring length, wiring shape, etc. of the wiring connected to the semiconductor elements is performed in order to equalize the current flowing through each semiconductor element (for example, patents). Reference 1).

  However, since a large current flows in a semiconductor element that operates in parallel, the influence of magnetic coupling between adjacent semiconductor elements cannot be ignored. It is difficult to distribute the current sufficiently evenly by adjusting the self-inductance and mutual inductance depending on the wiring length, wiring shape, etc. after arranging the semiconductor elements operated in parallel for each AC phase.

JP 2006-203974 A

  Embodiments of the present invention provide a power conversion device that reduces unbalance of currents flowing through semiconductor elements connected in parallel.

  A power converter according to an embodiment of the present invention inputs a DC voltage having a first voltage, inputs a DC voltage having a first voltage, and inputs a DC voltage having a second voltage lower than the first voltage, Alternatively, the second DC terminal for outputting, the first AC terminal for outputting or inputting the alternating current having the first phase, and the second for outputting or inputting the alternating current of the second phase that is 180 ° different from the first phase. A first converter including an AC terminal, a first half-bridge circuit electrically connected between the first DC terminal and the second DC terminal and electrically connected to the first AC terminal; and A second half bridge circuit disposed adjacent to the first converter and electrically connected between the first DC terminal and the second DC terminal and electrically connected to the second AC terminal; A first set of second converters and the first half bridge A third converter including a third half-bridge circuit electrically connected in parallel to the path; and a fourth converter disposed adjacent to the third converter and electrically connected in parallel to the second half-bridge circuit. And a second set of fourth conversion units including a half-bridge circuit. The first conversion unit and the second conversion unit in the first set, and the third conversion unit and the fourth conversion unit in the second set are arranged along a first direction, respectively.

  Provided is a power conversion device in which an imbalance of currents flowing through semiconductor elements connected in parallel is reduced.

It is a typical block diagram which illustrates the power converter concerning an embodiment. FIG. 2A is a circuit diagram illustrating a part of the power conversion device according to the embodiment. FIG. 2B is a schematic view illustrating a power module including the circuit of FIG. It is a typical block diagram which illustrates the power converter device of a comparative example. 10 is a schematic block diagram illustrating a power conversion device according to Modification 1. FIG. FIG. 10 is a schematic block diagram illustrating a power conversion device according to a second modification. 10 is a schematic block illustrating a power conversion device according to Modification 3.

Each embodiment will be described below with reference to the drawings.
The drawings are schematic or conceptual, and the relationship between the thickness and width of each part, the size ratio between the parts, and the like are not necessarily the same as actual ones. Further, even when the same part is represented, the dimensions and ratios may be represented differently depending on the drawings.
Note that, in the present specification and each drawing, the same elements as those described above with reference to the previous drawings are denoted by the same reference numerals, and detailed description thereof is omitted as appropriate.

FIG. 1 is a schematic block diagram illustrating a power conversion device according to an embodiment.
As illustrated in FIG. 1, the power conversion device 10 includes a plurality of first phase conversion units 21 and a plurality of second phase conversion units 22. The plurality of first phase converters 21 are connected in parallel. The plurality of second phase conversion units 22 are connected in parallel.

  The power conversion device 10 includes DC terminals 11p and 11n and AC terminals 12a and 12b. The power conversion device 10 can be connected to a DC circuit (not shown) through DC terminals 11p and 11n. The DC circuit can include a DC power supply, a DC load, a DC transmission line, and the like.

  The power converter 10 can be connected to the AC circuit 1 through the AC terminals 12a and 12b. The AC circuit 1 can include an AC power source, an AC load, a power system, and the like. The power converter 10 converts direct current into alternating current, or converts alternating current into direct current and outputs it. The power converter 10 performs bidirectional or one-way power conversion between direct current and alternating current.

  As will be described in detail later, the first phase converter 21 and the second phase converter 22 are the same half-bridge circuit. The first phase converter 21 and the second phase converter 22 operate with a phase difference of 180 °. That is, the power conversion device 10 includes a full bridge circuit that converts direct current into single-phase alternating current or converts single-phase alternating current into direct current. The first phase converter 21 is one leg of the single-phase full bridge circuit, and the second phase converter 22 is the other leg. A plurality of switching elements are connected in parallel for the arms constituting each leg. A large input / output current is realized by connecting a plurality of switching elements in parallel.

  In the half cycle of alternating current, as shown by the arrows in the figure, the current supplied from the high potential side of the direct current circuit via the direct current terminal 11p is the high side switching element of the first phase converter 21. Is output from the AC terminal 12a. The current output from the power converter 10 is input to the AC terminal 12b via the AC circuit 1. The AC current is output to the DC terminal 11n via the low-side switching element of the second phase converter 22.

  In the next half cycle of the alternating current, the current supplied from the high potential side of the DC circuit via the DC terminal 11p (not shown) passes through the high side switching element of the second phase converter 22. , And output from the AC terminal 12b. The AC current is output to the DC terminal 11n via the low-side switching element of the first phase converter 21.

  The plurality of first phase converters 21 and the plurality of second phase converters 22 are arranged in a line substantially linearly. In FIG. 1, two-dimensional coordinates are set in order to indicate positions and directions in which main components of the power conversion device 10 are arranged. Two-dimensional coordinates include an X axis and a Y axis. The X axis and the Y axis are orthogonal coordinate axes. The plurality of first phase conversion units 21 and the plurality of second phase conversion units 22 are arranged in a line in a direction substantially parallel to the X axis. As will be described in detail later, the bus bars (DC bus bars 31p, 31n, AC bus bars 51a, 51b) for connecting the plurality of first phase converters 21 and the plurality of second phase converters 22 in parallel are substantially on the X axis. It is provided in parallel. In addition, wiring is provided in a direction substantially parallel to the Y axis in order to electrically connect the plurality of first phase conversion units 21 and the plurality of second phase conversion units 22 and the bus bars. In the following description, this XY coordinate may be used.

  The first phase converter 21 has terminals 21p, 21n, and 21a. The second phase converter 22 has terminals 22p, 22n, and 22b. The terminals 21p, 21n, 22p, and 22n are terminals that input or output a DC voltage. The terminals 21a and 22b are terminals that output or input an alternating voltage.

  The terminals 21p, 21n, 21a and the terminals 22p, 22n, 22b are provided at the same positions in the first phase converter 21 and the second phase converter 22, respectively. Preferably, the plurality of first phase conversion units 21 and the plurality of second phase conversion units 22 are arranged in a line so that the respective terminals are arranged along the X-axis direction.

  The first phase converter 21 is disposed adjacent to the second phase converter 22. A group in which the first phase conversion unit 21 and the second phase conversion unit 22 are arranged adjacent to each other is referred to as a conversion unit pair 25. In the conversion unit pair 25, the second phase conversion unit 22 is disposed at a position closer to the positive direction of the X axis than the position where the first phase conversion unit 21 is disposed.

  The first phase conversion unit 21 is disposed adjacent to the second phase conversion unit 22 between the first phase conversion unit 21 and the second phase conversion unit 22 constituting the conversion unit pair 25. It is assumed that the conversion unit is not arranged. The same applies to the conversion unit pair 26 in which the positional relationship between the first phase conversion unit 21 and the second phase conversion unit 22 described later in the modification is opposite to the conversion unit pair 25.

  In this example, the conversion unit pairs 25 of the first phase conversion unit 21 and the second phase conversion unit 22 are arranged in the order of four sets along the X-axis direction. When expressed by the reference numerals of the respective conversion units, they are arranged in a line in the order of 21, 22, 21, 22, 21, 22, 21, 22 in the positive direction of the X axis.

  In the conversion part pair 25, since the 1st phase conversion part 21 and the 2nd phase conversion part 22 are arrange | positioned adjacently, the electric current which flows into terminal 21a, 21b is a reverse direction.

  The power converter 10 includes DC bus bars 31p and 31n. The DC bus bars 31p and 31n are formed of a conductor having substantially the same length, width and thickness. The DC bus bars 31p and 31n are provided so that the longitudinal direction is substantially parallel to the X-axis direction. That is, the DC bus bars 31p and 31n are provided so as to be substantially parallel to the array of the conversion unit pairs 25.

  The DC bus bars 31p and 31n have inductance components according to their shapes and arrangements. This inductance component is represented by a broken line in the figure. Similarly, other wirings (AC bus bars 51a and 51b and wirings 41p, 41n, 42p, 42n, 52a, and 52b) have inductance components corresponding to their shapes, but are indicated by broken lines.

  In this example, DC terminals 11p and 11n are connected to one ends of the DC bus bars 31p and 31n. A direct current voltage is supplied to the direct current bus bar 31p via the direct current terminal 11p, or a direct current voltage is output from the direct current bus bar 31p via the direct current terminal 11p. A DC voltage having a voltage lower than that of the DC bus bar 31p is supplied to the DC bus bar 31n, or a DC voltage having a voltage lower than that of the DC bus bar 31p is output from the DC bus bar 31n via the DC terminal 11n. .

  Wirings 41p and 41n are provided between the DC bus bars 31p and 31n and the terminals 21p and 21n of the first phase converter 21. Wirings 42 p and 42 n are provided between the DC bus bars 31 p and 31 n and the terminals 22 p and 22 n of the second phase converter 22. The wirings 41p and 41n and the wirings 42p and 42n are formed of a conductor having substantially the same length, width, and thickness. In this example, the wirings 41p, 41n, 42p, and 42n are provided so that the longitudinal direction is substantially parallel to the Y axis. That is, the wirings 41p, 41n, 42p, and 42n are provided so as to be substantially orthogonal to the DC bus bars 31p and 31n.

  Note that the DC bus bars 31p, 31n and the wirings 41p, 41n, 42p, 42n may be formed of different members, or may be integrally formed of the same member.

  Power conversion device 10 includes AC bus bars 51a and 51b. The AC bus bars 51a and 51b are formed of a conductor having substantially the same length, width and thickness. The AC bus bars 51a and 51b are provided so that the longitudinal direction thereof is substantially parallel to the X axis. That is, the AC bus bars 51 a and 51 b are provided so as to be substantially parallel to the arrangement of the conversion unit pair 25.

  In this example, a wiring 52a is provided between the AC terminal 12a and the AC bus bar 51a, and an AC first phase voltage is output from the AC terminal 12a, or an AC first phase voltage is input to the AC terminal 12a. Is done. A wiring 52b is provided between the AC terminal 12b and the AC bus bar 51b, and an AC second phase voltage is output from the AC terminal 12b, or an AC second phase voltage is input to the AC terminal 12b.

  A wiring 61a is provided between the terminal 21a of the first phase converter 21 and the AC bus bar 51a. A wiring 61b is provided between the terminal 22b of the second phase converter 22 and the AC bus bar 51b. The wirings 61a and 61b have substantially the same length, width, and thickness. All the wirings 61a and 61b are provided so that the longitudinal direction is substantially parallel to the Y axis.

  Note that the AC bus bars 51a and 51b and the wirings 61a and 61b may be formed of different members, or may be integrally formed of the same member.

  Thus, on the DC side of the four first phase converters 21 and the four second phase converters 22, all the converters are connected in parallel by the DC bus bars 31p and 31n.

  Further, on the AC side of the four first phase converters 21, all the first phase converters 21 are connected in parallel by the AC bus bar 51a. On the AC side of the four second phase converters 22, all the second phase converters 22 are connected in parallel by the AC bus bar 51b. That is, in the power converter 10, the four conversion units each share the alternating current output from the alternating current terminals 12a and 12b or the alternating current input to the alternating current terminals 12a and 12b.

  In this example, the first phase conversion unit 21 and the second phase conversion unit 22 constitute a conversion unit pair 25 for each alternating current to be shared, and the conversion unit pair 25 includes the first phase conversion unit 21 and the second phase conversion. The parts 22 are arranged adjacent to each other. Further, four pairs of conversion unit pairs 25 are arranged so that the arrangement directions are aligned and substantially parallel to the X axis.

  In the above description, the DC bus bars 31p, 31n and the AC bus bars 51a, 51b are substantially parallel to the X axis, and the wirings 41p, 41n, 42p, 42n and the wirings 61a, 61b are substantially parallel to the Y axis. However, the present invention is not limited to this. About the arrangement of these wirings, it is provided in an appropriate direction and shape according to restrictions such as a structure for connection to the outside such as a DC terminal or an AC terminal, a structure for heat dissipation, and the like.

FIG. 2A is a circuit diagram illustrating a part of the power conversion device according to the embodiment. FIG. 2B is a schematic view illustrating a power module including the circuit of FIG.
The first phase converter 21 and the second phase converter 22 are preferably semiconductor elements having the same input / output characteristics. Here, the first phase converter 21 and the second phase converter 22 are referred to as semiconductor elements 20.

  As shown in FIG. 2A, the semiconductor element 20 includes switching elements 101a and 101b and diodes 102a and 102b. The switching elements 101a and 101b are connected in series. The diodes 102a and 102b are connected in antiparallel to the switching elements 101a and 101b, respectively. The switching elements 101a and 101b are self-extinguishing switching elements, such as IGBTs (Insulated Gate Bipolar Transistors) and MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors).

  The semiconductor element 20 includes terminals 20p, 20n, and 20a. The terminal 20p is connected in series and is connected to the main electrode (for example, collector electrode) of the switching element 101a on the high potential side. The terminal 20n is connected in series and is connected to a main electrode (for example, an emitter electrode) of the switching element 101b on the low potential side. The terminal 20a is connected to a connection node of the switching elements 101a and 101b.

  In addition, the semiconductor element 20 includes terminals 20b and 20c for inputting a control signal for the switching element 101a and terminals 20d and 20e for inputting a control signal for the switching element 101b. Terminals 20b and 20c are connected to a control electrode and a main electrode (for example, a gate electrode and an emitter electrode) of switching element 101a, and terminals 20d and 20e are a control electrode and a main electrode (for example, a gate electrode and an emitter) of switching element 101b. Electrode).

  As shown in FIG. 2B, the semiconductor element 20 is a power module. The semiconductor element 20 which is a power module has a case 110 in which switching elements 101a and 101b and diodes 102a and 102b are connected on an insulating substrate with a wiring pattern (not shown). On the insulating substrate, a wiring pattern is drawn so as to be the circuit connection of FIG.

  The case 110 is provided with a heat dissipation plate for heat dissipation on one surface (surface not shown). The case 110 is a substantially rectangular parallelepiped having a surface on which a heat radiating plate is provided as a bottom surface, and terminals C1, E2, and C2E1 for electrical connection with other circuits are provided on a surface (upper surface) opposed to the bottom surface. It has been. The terminal C1 corresponds to the terminal 20p, the terminal E2 corresponds to the terminal 20n, and the terminal C2E1 corresponds to the terminal 20a. The terminals C1 and E2 are arranged along one side in the vicinity of one side of the rectangular surface forming the upper surface. The terminal C2E1 is disposed in the vicinity of the side facing the side where the terminals C1 and E2 are disposed. That is, the DC bus bars 31p and 31n are provided on the side where the terminals C1 and E2 are arranged, and the AC bus bars 51a and 51b are provided on the side where the terminal C2E1 is arranged, so that the electrical wiring of each wiring can be achieved at the shortest distance. A connection can be made.

  As shown in the XY coordinates of this figure, the semiconductor element 20 is arranged so that the edge of the case 110 provided with the terminals C1 and E2 is parallel to the DC bus bars 31a and 31b. In this case, the edge of the case 110 provided with the terminal C2E1 extends along the side where the AC bus bars 51a and 51b are provided. That is, the semiconductor element 20 is arranged so that these edges are substantially parallel to the X axis.

  The semiconductor element 20 is disposed in thermal contact with the surface of the radiator plate in contact with air-cooled or water-cooled cooling fins. A plurality of semiconductor elements 20 may be arranged in a row on a cooling fin having a longitudinal direction parallel to the X-axis direction, and cooling fins attached to each of the semiconductor elements 20 and the conversion unit pairs 25 are arranged along the X-axis direction. Alternatively, they may be arranged in a line.

  As already described, the semiconductor elements 20 are arranged in a row so as to be substantially parallel to the X axis. At this time, the adjacent distances between the semiconductor elements 20 are not limited to this, but are set to be approximately the same in this example. The adjacent distance between the semiconductor elements 20 may be changed within the conversion unit pair or between the conversion unit pairs, or may be the same. In order to make the output current uniform in each semiconductor element 20, it is preferable that the adjacent distances be equal.

The effect of the power converter device 10 of this embodiment is demonstrated.
As described above, in the power conversion device 10 of this embodiment, the first phase conversion unit 21 and the second phase conversion unit 22 are adjacent to each other to form the conversion unit pair 25, and the conversion unit pair 25 is connected in parallel. This improves the output current. The first phase conversion unit 21 and the second phase conversion unit 22 that are arranged closest to each other operate so as to cancel each other out of the magnetic fields generated by the alternating currents that are input and output from each other. Inductance is reduced, and variations in current shared by the switching elements 101a and 101b connected in parallel are reduced. In other words, by arranging the first phase conversion unit 21 and the second phase conversion unit 22 through which alternating-phase alternating currents flow adjacent to each other, the mutual inductance generated in the wiring in the semiconductor element (power module) is reduced. It is considered that the overall inductance is reduced, and the variation of the shared current is reduced.

FIG. 3 is a schematic block diagram illustrating a power conversion device of a comparative example.
As illustrated in FIG. 3, the power conversion device 210 of the comparative example includes four first phase conversion units 21 and four second phase conversion units 22, and includes the first phase conversion unit 21 and the first phase conversion unit 21. The two-phase converters 22 are all arranged in a line along the X-axis direction. However, in the power conversion device 210 of the comparative example, the first phase and the second phase are arranged together, and the first phase conversion unit 21 and the second phase conversion unit 22 are adjacent to each other. It is. Other different phase conversion units are not adjacent to each other, and the same phase conversion units are connected in parallel.

  In the case of the comparative example, the first phase conversion units 21 are arranged in a row so as to be adjacent to each other, and the second phase conversion units 22 are arranged in a row so as to be adjacent to each other. The first phase conversion unit 21 and the second phase conversion unit 22 in the center are adjacent to each other, but the first phase conversion unit 21 and the second phase conversion unit 22 connected in parallel to each other are adjacent to each other. Not arranged.

  In the case of the comparative example, when the variation of the alternating current output from each converter is evaluated using simulation, it is confirmed that there is a variation of about −50% to + 110% depending on the element. The variation in this case represents a deviation from the current value (average value) obtained by dividing the output current by the parallel number. That is, in a certain element, a current of + 110% of the average value flows.

  When the simulation is performed in the case of the embodiment under the same conditions for the bus bars and the separation distance between the conversion units, the variation in output current is confirmed to be about −20% to about + 10%, which is greatly improved. ing.

  In the above-described embodiment, the case where four conversion units are arranged in parallel for each AC phase has been described. However, the number of parallel units is not limited, and two or more conversion units may be connected in parallel. There may be one or more than five. The same applies to the modifications described below.

(Modification 1)
FIG. 4 is a schematic block diagram illustrating a power converter according to the first modification.
As illustrated in FIG. 4, the power conversion device 310 of the first modification includes a conversion unit pair 26 in addition to the conversion unit pair 25. The conversion unit pair 26 includes a first phase conversion unit 21 and a second phase conversion unit 22, and the first phase conversion unit 21 is disposed adjacent to the second phase conversion unit 22. What is different from the conversion unit pair 25 is the position where the first phase conversion unit 21 and the second phase conversion unit 22 are arranged. The 2nd phase conversion part 22 is arrange | positioned in the position from the negative direction of an X-axis rather than the position where the 1st phase conversion part 21 is arrange | positioned. That is, in the conversion unit pair 26, the positions of the first phase conversion unit 21 and the second phase conversion unit 22 in the conversion unit pair 25 are reversed.

  In the power conversion device 310 of the first modification, the conversion unit pair 25, the conversion unit pair 26, the conversion unit pair 25, and the conversion unit pair 26 are arranged in this order in the positive direction of the X axis. When expressed by the reference numerals of the respective conversion units, they are arranged in the order of 21, 22, 22, 21, 21, 22, 22, and 21.

  When a simulation is performed under the same conditions as in the embodiment and the comparative example shown in FIG. 1, it has been confirmed that the variation in output current is reduced to about −6% to + 6%.

  In this way, by converting converters that output alternating currents in opposite phases into pairs, and connecting the converter pairs in parallel, the magnetic fields generated according to the alternating currents between the paired converters are canceled. Thus, the substantial inductance can be reduced. Therefore, variation in the input / output current shared can be reduced.

(Modification 2)
All the conversion units included in the power conversion device are not limited to pairing those having opposite phases, and those having opposite phases may be paired with respect to some of the conversion units connected in parallel.
FIG. 5 is a schematic block diagram illustrating a power converter according to the second modification.
As shown in FIG. 5, in the power conversion device 410 of the present modification, three conversion unit pairs are set for the parallel number 4. In this example, of the three sets, two sets are the conversion unit pair 25, and the remaining one set is the conversion unit pair 26. In this example, the second first phase conversion unit 21 and the eighth second phase conversion unit 22 are replaced from the position of the smallest coordinate in the X coordinate in the conversion unit of FIG. As a result of such replacement, the conversion unit pair 25, the conversion unit pair 25, and the conversion unit pair 26 are arranged in this order from the smallest coordinate position of the X axis.

(Modification 3)
FIG. 6 is a schematic block diagram illustrating a power conversion device according to the third modification.
As shown in FIG. 6, the power conversion device 510 according to this modification includes two conversion unit pairs 25 and 26. In this modification, two conversion unit pairs are set for a parallel number of four. In this example, one of the two sets is the conversion unit pair 25 and the other is the conversion unit pair 26. This example is a case where the fourth first phase conversion unit 21 and the sixth second phase conversion unit 22 are replaced from the position of the coordinate with the smallest X coordinate in the conversion unit of FIG.

  The variation in the sharing of AC input / output current is due to the magnetic field induced and interacting with many parameters such as the spacing between each converter, the shape of the conductive heat sink, the current magnitude, and the frequency. Is different. Therefore, an appropriate conversion unit pair can be set and the arrangement can be selected according to the actual current variation due to the coupling state.

  According to the embodiment described above, it is possible to realize a power conversion device that reduces the unbalance of the current flowing through the semiconductor elements connected in parallel.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 AC circuit 10, 310, 410, 510 Power converter, 20 Semiconductor element, 21 1st phase conversion part, 22 2nd phase conversion part, 25, 26 conversion part pair, 31p, 31n DC bus bar, 41p, 41n, 42p, 42n, 51a, 51b, 61a, 61b wiring, 101a, 101b switching element, 102a, 102b diode, 110 case

Claims (4)

A first DC terminal for inputting or outputting a DC voltage having a first voltage;
A second DC terminal for inputting or outputting a DC voltage having a second voltage lower than the first voltage;
A first alternating current terminal for outputting or inputting alternating current having a first phase;
A second AC terminal that outputs or inputs an alternating current of a second phase that is 180 ° different from the first phase;
A first converter including a first half-bridge circuit electrically connected between the first DC terminal and the second DC terminal and electrically connected to the first AC terminal; and the first converter 2nd conversion part including the 2nd half bridge circuit arrange | positioned adjacent to a part and electrically connected between the said 1st DC terminal and the said 2nd DC terminal, and being electrically connected to the said 2nd AC terminal The first set of
A third converter including a third half-bridge circuit electrically connected in parallel to the first half-bridge circuit; and an electrical parallel to the second half-bridge circuit disposed adjacent to the third converter. A second set of fourth converters including a connected fourth half-bridge circuit;
With
The first conversion unit and the second conversion unit in the first set, and the third conversion unit and the fourth conversion unit in the second set are arranged along the first direction, respectively. Conversion device.   The positions where the first conversion unit and the second conversion unit are arranged in the first set are the same as the positions where the third conversion unit and the fourth conversion unit are arranged in the second set. The power conversion device according to claim 1.   The positions where the first conversion unit and the second conversion unit are arranged in the first set are opposite to the positions where the third conversion unit and the fourth conversion unit are arranged in the second set. The power conversion device according to claim 1. A fifth converter including a fifth half-bridge circuit electrically connected in parallel to the first half-bridge circuit; and an electrical converter parallel to the second half-bridge circuit disposed adjacent to the fifth converter. A third set including a sixth conversion unit including a connected sixth half-bridge circuit;
The power converter according to any one of claims 1 to 3, wherein the fifth conversion unit and the sixth conversion unit in the third set are arranged along the first direction.

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