Power Conversion Equipment

Abstract

The power conversion device (1) includes a bottom insulating plate (12), a plurality of insulating supports (11), a base (15), a plurality of sub-modules (10), and a tuned mass damper (20). The plurality of insulating supports (11) support the bottom insulating plate (12) with respect to an installation surface (2). The base (15) is disposed on the opposite side of the installation surface (2) with respect to the bottom insulating plate (12) and is fixed to the bottom insulating plate (12). The base (15) includes first sub-bases (16a, 16b, 16c, 16d) of multiple stages. The sub-modules (10) are mounted on the bottom insulating plate (12) and on first insulating plates (18) of the first sub-bases (16a, 16b, 16c, 16d) of the multiple stages. The tuned mass damper (20) is installed on the base (15). Each of the insulating posts (11) has a length of 1 m or more, and is made of fiber-reinforced plastic.

Description

[Technical field]

[0001] The present disclosure relates to a power conversion device. [Background technology]

[0002] International Publication No. 2019 / 003432 (Patent Document 1) describes a power conversion device. The power conversion device described in Patent Document 1 has a plurality of base columns, a first stage, a plurality of stage columns, a second stage, and a plurality of power conversion units. The first stage is supported by a plurality of base columns. The second stage is supported by a plurality of stage columns. Each of the plurality of stage columns is attached to each of the plurality of base columns. A plurality of power conversion units are arranged on the first stage and the second stage. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2019 / 003432 Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present disclosure is to provide a power conversion device that has improved earthquake resistance and reduced design burden even when the maximum voltage (voltage class) handled by the power conversion device increases. [Means for solving the problem]

[0005] The power conversion device includes a bottom insulating plate, a plurality of insulating pillars, a mounting base, a plurality of sub-modules, and a tuned mass damper. The plurality of insulating pillars support the bottom insulating plate against an installation surface. The mounting base is disposed on the opposite side of the bottom insulating plate from the installation surface and is fixed to the bottom insulating plate. The mounting base includes a first sub-mount of a plurality of stages. Each of the first sub-mounts of the plurality of stages includes a first insulating plate and a plurality of first pillars supporting the first insulating plate. The plurality of sub-modules are mounted on the bottom insulating plate and the first insulating plate. The tuned mass damper is installed on the mounting base. Each of the plurality of insulating pillars has a length of 1 m or more and is formed of fiber reinforced plastic. Effect of the Invention

[0006] According to the power conversion device of the present disclosure, it is possible to provide a power conversion device that has improved earthquake resistance and a reduced design burden even if the maximum voltage (voltage class) that the power conversion device handles increases. [Brief description of the drawings]

[0007] [Figure 1] 1 is a circuit diagram showing an overall configuration of a power conversion device. [Diagram 2] FIG. 2 is a schematic circuit diagram of a submodule. [Diagram 3] 1 is a schematic front view of a power conversion device according to a first embodiment. [Figure 4] 11 is a schematic front view of a power conversion device according to a second embodiment. FIG. [Diagram 5] FIG. 11 is a schematic front view of a power conversion device according to a third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, embodiments of the present disclosure will be described. Note that the same reference numerals are used to refer to the same components, and the description thereof will not be repeated.

[0009] Embodiment 1 A circuit configuration of a power conversion device 1 according to the first embodiment will be described with reference to Fig. 1 and Fig. 2. The power conversion device 1 according to the present embodiment is, but is not limited to, for example, an MMC (Multilevel Modular Converter) type high voltage direct current (HVDC) converter.

[0010] Referring to FIG. 1, the power conversion device 1 is connected to an AC power system 100 via a transformer 101. The power conversion device 1 is connected to a DC power system 102. The power converter converts AC power input to the AC power system 100 into high-voltage DC power and outputs it to the DC power system 102. The power conversion device 1 includes a plurality of sets of upper arms 103 and lower arms 104. The upper arms 103 and lower arms 104 are connected in series with each other. The plurality of sets of upper arms 103 and lower arms 104 are connected in parallel with each other. The transformer 101 is connected between the upper arms 103 and the lower arms 104. The upper arms 103 and the lower arms 104 each include a plurality of submodules 10 connected in series.

[0011] 2, each of the sub-modules 10 includes, for example, switching elements 105a and 105b, diodes 106a and 106b, a capacitor 107, and connection lines 108a and 108b.

[0012] The switching elements 105a and 105b are, for example, insulated gate bipolar transistors (IGBTs). The switching elements 105a and 105b are connected in series to each other.

[0013] The diode 106a is connected in anti-parallel to the switching element 105a. The diode 106b is connected in anti-parallel to the switching element 105b. The capacitor 107 is connected in parallel to the switching elements 105a and 105b.

[0014] The connection line 108a is connected to the emitter terminal of the switching element 105a and the collector terminal of the switching element 105b. The connection line 108b is connected to the emitter terminal of the switching element 105b. The connection line 108a of a submodule 10 is connected to the connection line 108b of another submodule 10 adjacent to the submodule 10. In this manner, the submodules 10 form a half-bridge type converter cell.

[0015] The configuration of the power converter 1 of the first embodiment will be described with reference to Fig. 3. The power converter 1 of the present embodiment includes a bottom insulating plate 12, a plurality of insulating posts 11, a stand 15, a plurality of sub-modules 10, and a tuned mass damper 20. The power converter 1 may further include a mounting member 13.

[0016] The bottom insulating plate 12 is formed of an insulating material such as glass epoxy resin or ceramic. The bottom insulating plate 12 has a main surface 12p facing the installation surface 2 and a main surface 12q opposite to the main surface 12p. The main surface 12p faces, for example, downward in the direction of gravity. The main surface 12q faces, for example, upward in the direction of gravity. The main surface 12q is a mounting surface for the multiple submodules 10. The installation surface 2 is a surface on which the power conversion device 1 is installed. The installation surface 2 is grounded.

[0017] The insulating posts 11 support the bottom insulating plate 12 against the installation surface 2. Specifically, the upper end of each of the insulating posts 11 is detachably fixed to the bottom insulating plate 12. The upper end of each of the insulating posts 11 is, for example, screwed into the bottom insulating plate 12. The lower end of each of the insulating posts 11 is detachably fixed to the installation surface 2 via, for example, a mounting member 13. The insulating posts 11 are, for example, cylindrical members. The insulating posts 11 are formed of an insulating material such as, for example, fiber reinforced plastic (FRP).

[0018] The longitudinal direction of each of the insulating pillars 11 is the direction of gravity. For example, each of the insulating pillars 11 has a length L1 of 1 m or more. The length L1 may be 1.5 m or more, or may be 2 m or more. The length L1 is the length of each of the insulating pillars 11 in the longitudinal direction of each of the insulating pillars 11.

[0019] The mount 15 is disposed on the opposite side of the installation surface 2 with respect to the bottom insulating plate 12. The mount 15 is disposed above the bottom insulating plate 12 in the direction of gravity. The mount 15 is detachably fixed to the bottom insulating plate 12. The mount 15 includes first sub-mounts 16a, 16b, 16c, and 16d in multiple stages and a second sub-mount 21. The mount 15 is formed by stacking the first sub-mounts 16a, 16b, 16c, and 16d in multiple stages and the second sub-mount 21 in the direction of gravity.

[0020] The first sub-mounts 16a, 16b, 16c, and 16d are formed by stacking the first sub-mounts 16a, 16b, 16c, and 16d in the direction of gravity. Each of the first sub-mounts 16a, 16b, 16c, and 16d includes a first insulating plate 18 and a plurality of first supports 17.

[0021] The first insulating plate 18 is formed of an insulating material such as glass epoxy resin or ceramic. The first insulating plate 18 may be formed of the same material as the bottom insulating plate 12. The first insulating plate 18 has a main surface 18p facing the installation surface 2 and the bottom insulating plate 12, and a main surface 18q opposite to the main surface 18p. The main surface 18p faces, for example, downward in the direction of gravity. The main surface 18q faces, for example, upward in the direction of gravity. The main surface 18q is a mounting surface for the multiple submodules 10.

[0022] The first pillars 17 support the first insulating plate 18. Specifically, the upper end of each of the first pillars 17 is detachably fixed to the first insulating plate 18. The upper end of each of the first pillars 17 is, for example, screwed to the first insulating plate 18. The lower end of each of the first pillars 17 is detachably fixed to an insulating plate (the lowermost insulating plate 12 or the first insulating plate 18) located immediately below the first insulating plate 18. The lower end of each of the first pillars 17 is, for example, screwed to an insulating plate (the lowermost insulating plate 12 or the first insulating plate 18) located immediately below the first insulating plate 18. The first pillars 17 are, for example, cylindrical members. The first pillars 17 are, for example, formed of an insulating material such as fiber-reinforced plastic (FRP). The first pillars 17 may be formed of the same material as the insulating pillars 11.

[0023] The longitudinal direction of each of the multiple first pillars 17 is the direction of gravity. The length L2 of each of the multiple first pillars 17 is shorter than the length L1 of each of the multiple insulating pillars 11. For example, each of the multiple first pillars 17 has a length L2 of less than 1 m. The length L2 is the length of each of the multiple first pillars 17 in the longitudinal direction of each of the multiple first pillars 17.

[0024] The second sub-mount 21 is detachably fixed to the first sub-mount 16d, which is the uppermost one of the first sub-mounts 16a, 16b, 16c, and 16d. The second sub-mount 21 constitutes the uppermost part of the mount 15. The second sub-mount 21 includes a second insulating plate 23 and a plurality of second supports 22.

[0025] The second insulating plate 23 is formed of an insulating material such as glass epoxy resin or ceramic. The second insulating plate 23 may be formed of the same material as the bottom insulating plate 12 and the first insulating plate 18. The second insulating plate 23 has a main surface 23p facing the installation surface 2, the bottom insulating plate 12, and the first insulating plate 18, and a main surface 23q opposite to the main surface 23p. The main surface 23p faces, for example, downward in the direction of gravity. The main surface 23q faces, for example, upward in the direction of gravity. The main surface 23q is a mounting surface for the tuned mass damper (TMD) 20.

[0026] The second insulating plate 23 is disposed further away from the installation surface 2 than the first insulating plate 18 of the first sub-rack 16d that is the farthest from the installation surface 2 among the multiple stages of first sub-racks 16a, 16b, 16c, 16d (i.e., the first sub-rack 16d that is the uppermost stage among the multiple stages of first sub-racks 16a, 16b, 16c, 16d). The second insulating plate 23 is disposed above the first insulating plate 18 of the first sub-rack 16d that is the uppermost stage among the multiple stages of first sub-racks 16a, 16b, 16c, 16d.

[0027] The second pillars 22 support the second insulating plate 23. The second pillars 22 are detachably fixed to the first insulating plate 18 of the first sub-rack 16d that is the furthest from the installation surface 2 among the first sub-racks 16a, 16b, 16c, and 16d (i.e., the first sub-rack 16d in the uppermost stage among the first sub-racks 16a, 16b, 16c, and 16d in the multiple stages). Specifically, the upper end of each of the second pillars 22 is detachably fixed to the second insulating plate 23. The upper end of each of the second pillars 22 is screwed to the second insulating plate 23, for example. The lower end of each of the second pillars 22 is detachably fixed to the first insulating plate 18 of the first sub-rack 16d that is directly below the second insulating plate 23. The lower end of each of the plurality of second pillars 22 is screwed to, for example, the first insulating plate 18 of the first sub-mount 16d.

[0028] The second pillars 22 are, for example, cylindrical members. The second pillars 22 are, for example, formed of an insulating material such as fiber-reinforced plastic (FRP). The second pillars 22 may be formed of the same material as the insulating pillars 11 and the first pillars 17. The longitudinal direction of each of the second pillars 22 is the direction of gravity. The length L3 of the second pillars 22 is shorter than the length L1 of the insulating pillars 11. For example, each of the second pillars 22 has a length L3 of less than 1 m. The length L3 is the length of each of the second pillars 22 in the longitudinal direction of each of the second pillars 22.

[0029] The multiple submodules 10 are mounted on the main surface 12q of the bottom insulating plate 12 and the main surface 18q of the first insulating plate 18. The multiple submodules 10 are connected in series.

[0030] The tuned mass damper 20 is mounted on the mount 15. In this embodiment, the tuned mass damper 20 is disposed farther from the installation surface 2 than the mount 15. The tuned mass damper 20 is mounted on the uppermost insulating plate (second insulating plate 23) of the mount 15. The tuned mass damper 20 is mounted on the uppermost surface of the mount 15 (specifically, the main surface 23q of the second insulating plate 23).

[0031] The operation of the power conversion device 1 of this embodiment will be described. When the maximum voltage (voltage class) handled by the power conversion device 1 increases, it is necessary to increase the distance between the multiple submodules 10 and the installation surface 2 in order to ensure an insulation distance between the multiple submodules 10 and the installation surface 2. Therefore, as the maximum voltage (voltage class) handled by the power conversion device 1 increases, the length L1 of each of the multiple insulating supports 11 increases. As a result, the center of gravity of the power conversion device 1 becomes higher. Furthermore, when the maximum voltage (voltage class) handled by the power conversion device 1 increases, the number of the multiple submodules 10 increases, and the weight of the power conversion device 1 increases. Due to such an increase in the height of the center of gravity and the weight of the power conversion device 1, the earthquake resistance of the power conversion device 1 deteriorates.

[0032] The power converter 1 of this embodiment includes a tuned mass damper 20. Therefore, even if the maximum voltage (voltage class) handled by the power converter 1 increases and the height and weight of the center of gravity of the power converter 1 increase, the tuned mass damper 20 reduces the shaking of the power converter 1 when an earthquake occurs. The earthquake resistance of the power converter 1 is improved. In addition, in order to improve the earthquake resistance of the power converter 1, it is not necessary to increase the number of the insulating struts 11 or to increase the thickness of the insulating struts 11. Without changing the configuration of the insulating struts 11, the power converter 1 can comply with earthquake resistance standards of various voltage classes and various countries in which the power converter 1 is installed. The design burden of the power converter 1 is reduced.

[0033] When the length L1 of each of the multiple insulating pillars 11 is 1 m or more and the multiple insulating pillars 11 are made of fiber reinforced plastic (FRP), the insulating pillars 11 are prone to bending. This, combined with an increase in the height of the center of gravity and the weight of the power conversion device 1, increases the shaking of the power conversion device 1 when an earthquake occurs. The tuned mass damper 20 effectively reduces the shaking of the power conversion device 1 when an earthquake occurs. The earthquake resistance of the power conversion device 1 is improved.

[0034] The effects of the power conversion device 1 of this embodiment will be described. The power conversion device 1 of this embodiment includes a bottom insulating plate 12, a plurality of insulating supports 11, a base 15, a plurality of sub-modules 10, and a tuned mass damper 20. The plurality of insulating supports 11 support the bottom insulating plate 12 with respect to the installation surface 2. The base 15 is disposed on the opposite side of the installation surface 2 with respect to the bottom insulating plate 12, and is fixed to the bottom insulating plate 12. The base 15 includes first sub-bases 16a, 16b, 16c, and 16d of multiple stages. Each of the first sub-bases 16a, 16b, 16c, and 16d of the multiple stages includes a first insulating plate 18 and a plurality of first supports 17 that support the first insulating plate 18. The plurality of sub-modules 10 are mounted on the bottom insulating plate 12 and the first insulating plate 18. The tuned mass damper 20 is installed on the base 15. Each of the insulating posts 11 has a length L1 of 1 m or more, and is made of fiber reinforced plastic.

[0035] When the maximum voltage (voltage class) handled by the power conversion device 1 increases, the height of the center of gravity and the weight of the power conversion device 1 increase. In addition, the insulating supports 11 made of fiber-reinforced plastic are more flexible than the insulating supports made of metal. Furthermore, since each of the insulating supports 11 has a length L1 of 1 m or more, the height of the center of gravity of the power conversion device 1 increases. Therefore, the shaking of the power conversion device 1 during an earthquake increases. However, the power conversion device 1 of this embodiment includes a tuned mass damper 20. Therefore, the earthquake resistance of the power conversion device 1 can be improved. In addition, the power conversion device 1 can comply with earthquake resistance standards of various voltage classes and various countries in which the power conversion device 1 is installed without changing the configuration of the insulating supports 11. The design burden of the power conversion device 1 is reduced.

[0036] In the power conversion device 1 of the present embodiment, the tuned mass damper 20 is disposed farther from the installation surface 2 than the frame 15 is.

[0037] The tuned mass damper 20 is disposed in a location that allows it to be easily attached and detached from the frame 15. This makes it easy to attach and replace the tuned mass damper 20.

[0038] In the power converter 1 of the present embodiment, the mount 15 further includes a second sub-mount 21. The second sub-mount 21 includes a second insulating plate 23 and a plurality of second supports 22 supporting the second insulating plate 23. The second insulating plate 23 is disposed farther from the installation surface 2 than the first insulating plate 18 of the first sub-mount 16d that is farthest from the installation surface 2 among the first sub-mounts 16a, 16b, 16c, and 16d of the multiple stages. The plurality of second supports 22 are detachably fixed to the first insulating plate 18 of the first sub-mount 16d that is farthest from the installation surface 2 among the first sub-mounts 16a, 16b, 16c, and 16d of the multiple stages. The tuned mass damper 20 is mounted on the second insulating plate 23.

[0039] Therefore, the tuned mass damper 20 is disposed in a location that allows it to be easily attached and detached from the frame 15. This makes it easy to attach and replace the tuned mass damper 20.

[0040] Embodiment 2 The power conversion device 1 of the second embodiment will be described with reference to Fig. 4. The power conversion device 1 of the present embodiment has a similar configuration to the power conversion device 1 of the first embodiment and achieves the same effects, but differs mainly in the following respects.

[0041] The tuned mass damper 20 of this embodiment is disposed closer to the installation surface 2 than the tuned mass damper 20 of the first embodiment. The tuned mass damper 20 of this embodiment is disposed closer to the center of gravity of the power conversion device 1 than the tuned mass damper 20 of the first embodiment. In this embodiment, the tuned mass damper 20 is disposed inside the mount 15. The tuned mass damper 20 is disposed between the first insulating plate 18 and the bottom insulating plate 12 of the first sub-mount 16d that is the farthest from the installation surface 2 among the first sub-mounts 16a, 16b, 16c, and 16d of the multiple stages (i.e., the first sub-mount 16d of the uppermost stage among the first sub-mounts 16a, 16b, 16c, and 16d of the multiple stages). For example, the tuned mass damper 20 is disposed between the first insulating plate 18 of the first sub-mount 16c and the first insulating plate 18 of the first sub-mount 16b.

[0042] The second sub-mount 21 is disposed between two adjacent first sub-mounts (e.g., the first sub-mount 16b and the first sub-mount 16c) among the multiple stages of the first sub-mounts 16a, 16b, 16c, and 16d. The second sub-mount 21 is detachably fixed to two adjacent first sub-mounts (e.g., the first sub-mount 16b and the first sub-mount 16c) among the multiple stages of the first sub-mounts 16a, 16b, 16c, and 16d.

[0043] The second insulating plate 23 is disposed between the first insulating plate 18 of the first sub-rack 16d that is the furthest from the installation surface 2 among the first sub-racks 16a, 16b, 16c, and 16d in the multiple stages (i.e., the first sub-rack 16d in the uppermost stage among the first sub-racks 16a, 16b, 16c, and 16d in the multiple stages) and the bottom insulating plate 12. For example, the tuned mass damper 20 is disposed between the first insulating plate 18 of the first sub-rack 16c and the first insulating plate 18 of the first sub-rack 16b.

[0044] The second pillars 22 are fixed to a first insulating plate 18 (e.g., the first insulating plate 18 of the first sub-rack 16b) disposed between the first insulating plate 18 of the first sub-rack 16d that is farthest from the installation surface 2 among the first sub-racks 16a, 16b, 16c, 16d of the multiple stages (i.e., the first sub-rack 16d of the uppermost stage among the first sub-racks 16a, 16b, 16c, 16d of the multiple stages) and the bottom insulating plate 12. The upper end of each of the second pillars 22 is screwed to the second insulating plate 23, for example. The lower end of each of the second pillars 22 is detachably fixed to a first insulating plate 18 (for example, the first insulating plate 18 of the first sub-rack 16b) disposed between the first insulating plate 18 of the uppermost first sub-rack 16d of the multiple stages of the first sub-racks 16a, 16b, 16c, 16d and the lowest insulating plate 12. The lower end of each of the second pillars 22 is screwed to a first insulating plate 18 (for example, the first insulating plate 18 of the first sub-rack 16b) disposed between the first insulating plate 18 of the uppermost first sub-rack 16d of the multiple stages of the first sub-racks 16a, 16b, 16c, 16d and the lowest insulating plate 12.

[0045] The power conversion device 1 of this embodiment provides the following effects in addition to the effects of the power conversion device 1 of the first embodiment.

[0046] In the power conversion device 1 of this embodiment, the tuned mass damper 20 is arranged between the first insulating plate 18 and the bottom insulating plate 12 of the first sub-mount 16d, which is the farthest from the installation surface 2 among the multiple stages of first sub-mounts 16a, 16b, 16c, and 16d.

[0047] This increases the degree of freedom in arranging the tuned mass damper 20. It becomes possible to arrange the tuned mass damper 20 at a position that can further improve the earthquake resistance of the power conversion device 1. The earthquake resistance of the power conversion device 1 can be improved.

[0048] In the power conversion device 1 of the present embodiment, the mount 15 further includes a second sub-mount 21. The second sub-mount 21 includes a second insulating plate 23 on which the tuned mass damper 20 is mounted, and a plurality of second pillars 22 supporting the second insulating plate 23. The second sub-mount 21 is disposed between two adjacent first sub-mounts (for example, the first sub-mount 16b and the first sub-mount 16c) among the multiple stages of first sub-mounts 16a, 16b, 16c, and 16d.

[0049] This increases the degree of freedom in arranging the tuned mass damper 20. It becomes possible to arrange the tuned mass damper 20 at a position that can further improve the earthquake resistance of the power conversion device 1. The earthquake resistance of the power conversion device 1 can be improved.

[0050] Embodiment 3 The power conversion device 1 of the third embodiment will be described with reference to Fig. 5. The power conversion device 1 of the present embodiment has a similar configuration to the power conversion device 1 of the second embodiment and achieves the same effects, but differs mainly in the following respects.

[0051] In this embodiment, the second sub-mount 21 is omitted. The mount 15 includes multiple tiers of first sub-mounts 16a, 16b, 16c, and 16d, but does not include the second sub-mount 21. The mount 15 is formed by stacking multiple tiers of first sub-mounts 16a, 16b, 16c, and 16d in the gravity direction.

[0052] The tuned mass damper 20 is installed on one of the first sub-mounts 16a, 16b, 16c, and 16d (for example, the first sub-mount 16c). Specifically, the tuned mass damper 20 is detachably fixed to a main surface 18p of a first insulating plate 18 of one of the first sub-mounts 16a, 16b, 16c, and 16d (for example, the first sub-mount 16c) using a screw or the like. A part of the sub-modules 10 is mounted on a main surface 18q of a first insulating plate 18 of one of the first sub-mounts 16a, 16b, 16c, and 16d (for example, the first sub-mount 16c) of the first sub-mounts 16a, 16b, 16c, and 16d. In order to dispose some of the submodules 10 and the tuned mass damper 20 between the first submount 16c and the first submount 16b, the first pillar 17 of the first submount 16c is longer than the first pillars 17 of the other first submounts 16a, 16b, 16d. The first pillar 17 of the first submount 16c is shorter than each of the isolation pillars 11.

[0053] The tuned mass damper 20 may be installed on the main surface 18p of the first insulating plate 18 of the first sub-mount 16d, may be installed on the main surface 18p of the first insulating plate 18 of the first sub-mount 16b, or may be installed on the main surface 18p of the first insulating plate 18 of the first sub-mount 16a. The tuned mass damper 20 may be installed on the main surface 18q of the first insulating plate 18 of the first sub-mount 16d, may be installed on the main surface 18q of the first insulating plate 18 of the first sub-mount 16c, may be installed on the main surface 18q of the first insulating plate 18 of the first sub-mount 16b, or may be installed on the main surface 18q of the first insulating plate 18 of the first sub-mount 16a.

[0054] The power conversion device 1 of this embodiment has the following effects in addition to the effects of the power conversion device 1 of the second embodiment.

[0055] In the power conversion device 1 of the present embodiment, the tuned mass damper 20 is installed on one of the first sub-mounts 16a, 16b, 16c, and 16d in a plurality of stages (for example, the first sub-mount 16c).

[0056] This eliminates the need for the second sub-frame 21. It is possible to reduce the installation cost of the tuned mass damper 20. It is possible to provide a low-cost power conversion device 1 having improved earthquake resistance.

[0057] In the power converter 1 of the present embodiment, the first insulating plate 18 of one of the first sub-mounts 16a, 16b, 16c, 16d (for example, the first sub-mount 16c) includes a first main surface (main surface 18p) facing the installation surface 2 and a second main surface (main surface 18q) opposite to the first main surface. The tuned mass damper 20 is installed on the first main surface of the first insulating plate 18 of one of the first sub-mounts 16a, 16b, 16c, 16d (for example, the first sub-mount 16c) of the multiple stages. Some of the multiple sub-modules 10 are mounted on the second main surface of the first insulating plate 18 of one of the first sub-mounts 16a, 16b, 16c, 16d (for example, the first sub-mount 16c) of the multiple stages.

[0058] Therefore, the tuned mass damper 20 can be installed on the frame 15 without interfering with the multiple submodules 10. There is no need to change the number and arrangement of the multiple submodules 10. The earthquake resistance of the power conversion device 1 can be improved while maintaining the power conversion performance of the power conversion device 1.

[0059] The embodiments 1 to 3 disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present disclosure is defined by the claims, not the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0060] 1 power conversion device, 2 installation surface, 10 submodule, 11 insulating support, 12 bottom insulating plate, 12p, 12q main surface, 13 mounting member, 15 frame, 16a, 16b, 16c, 16d first subframe, 17 first support, 18 first insulating plate, 18p, 18q main surface, 20 tuned mass damper, 21 second subframe, 22 second support, 23 second insulating plate, 23p, 23q main surface, 100 AC power system, 101 transformer, 102 DC power system, 103 upper arm, 104 lower arm, 105a, 105b switching element, 106a, 106b diode, 107 capacitor, 108a, 108b connecting wire.

Claims

1. A bottom insulating plate; a plurality of insulating posts supporting the bottom insulating plate against a mounting surface; a stand that is disposed on the opposite side of the bottom insulating plate from the installation surface and is fixed to the bottom insulating plate; Multiple submodules, a tuned mass damper mounted on the frame; The frame includes a first sub-frame and a second sub-frame in a plurality of stages, Each of the first sub-frames in the plurality of stages includes a first insulating plate and a plurality of first support columns that support the first insulating plate; the plurality of sub-modules are mounted on the bottom insulating plate and the first insulating plate; Each of the insulating struts has a length of 1 m or more and is made of fiber-reinforced plastic; the second sub-mount includes a second insulating plate and a plurality of second pillars supporting the second insulating plate; the second insulating plate is disposed farther from the installation surface than the first insulating plate of a first sub-rack that is farthest from the installation surface among the first sub-racks of the plurality of stages, the second columns are detachably fixed to the first insulating plate of the first sub-rack that is farthest from the installation surface among the first sub-racks of the plurality of stages, The tuned mass damper is disposed farther from the installation surface than the base and is mounted on the second insulating plate.

2. A bottom insulating plate; a plurality of insulating posts supporting the bottom insulating plate against a mounting surface; a stand that is disposed on the opposite side of the bottom insulating plate from the installation surface and is fixed to the bottom insulating plate; Multiple submodules, a tuned mass damper mounted on the frame; The platform includes a first sub-platform having a plurality of stages, Each of the first sub-frames in the plurality of stages includes a first insulating plate and a plurality of first support columns that support the first insulating plate; the plurality of sub-modules are mounted on the bottom insulating plate and the first insulating plate; Each of the insulating struts has a length of 1 m or more and is made of fiber-reinforced plastic; the tuned mass damper is disposed between the first insulating plate and the bottom insulating plate of a first sub-frame that is farthest from the installation surface among the first sub-frames of the plurality of stages, the tuned mass damper is mounted on one of the first sub-frames of the plurality of stages; The first insulating plate of one of the first sub-racks in the plurality of stages includes a first main surface facing the installation surface and a second main surface opposite to the first main surface, the tuned mass damper is disposed on the first major surface; A power conversion device, wherein some of the plurality of sub-modules are mounted on the second main surface.