Power conversion device

Abstract

This power conversion device (1) comprises a lowermost insulation plate (12), a plurality of insulation supports (11), a frame (15), a plurality of sub-modules (10), and a tuning mass damper (20). The plurality of insulation supports (11) support the lowermost insulation plate (12) on an installation surface (2). The frame (15) is disposed on the side of the lowermost insulation plate (12) opposite from the installation surface (2) and is fixed to the lowermost insulation plate (12). The frame (15) includes a plurality of first sub-frames (16a, 16b, 16c, 16d). The plurality of sub-modules (10) are mounted on the lowermost insulation plate (12) and on a first insulation plate (18) of the plurality of first sub-frames (16a, 16b, 16c, 16d). The tuning mass damper (20) is installed on the frame (15). Each of the plurality of insulating supports (11) measures at least 1 m in length, and is formed of fiber-reinforced plastic.

Description

Power Conversion Device

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

[0002] International Publication No. WO 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 a respective one of the plurality of base columns. A plurality of power conversion units are arranged on the first stage and the second stage.

[0003] International Publication No. 2019 / 003432

[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.

[0005] The power conversion device includes a bottom insulating plate, a plurality of insulating struts, a base, a plurality of sub-modules, and a tuned mass damper. The plurality of insulating struts support the bottom insulating plate relative to an installation surface. The 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 base includes a plurality of first sub-bases. Each of the plurality of first sub-bases includes a first insulating plate and a plurality of first struts 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 base. Each of the plurality of insulating struts has a length of 1 meter or more and is formed of fiber-reinforced plastic.

[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 reduced design burden, even if the maximum voltage (voltage class) handled by the power conversion device increases.

[0007] It is a circuit diagram showing the overall configuration of a power conversion device.It is a schematic circuit diagram of a sub-module.It is a schematic front view of a power conversion device of embodiment 1.It is a schematic front view of a power conversion device of embodiment 2.It is a schematic front view of a power conversion device of embodiment 3.

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

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

[0010] Referring to Fig. 1, a 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 the 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. Each of the upper arms 103 and the lower arms 104 includes a plurality of submodules 10 connected in series.

[0011] Referring to FIG. 2, each of the sub-modules 10 includes, for example, switching elements 105a and 105b, diodes 106a and 106b, a capacitor 107, and connecting 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 with 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 way, the submodules 10 form a half-bridge converter cell.

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

[0016] The bottom insulating plate 12 is made 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 downward in the direction of gravity, for example. The main surface 12q faces upward in the direction of gravity, for example. 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 struts 11 support the bottom insulating plate 12 relative to the installation surface 2. Specifically, the upper end of each of the insulating struts 11 is detachably fixed to the bottom insulating plate 12. The upper end of each of the insulating struts 11 is, for example, screwed into the bottom insulating plate 12. The lower end of each of the insulating struts 11 is detachably fixed to the installation surface 2 via, for example, an attachment member 13. The insulating struts 11 are, for example, cylindrical members. The insulating struts 11 are formed of an insulating material such as fiber-reinforced plastic (FRP).

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

[0019] The mount 15 is disposed on the opposite side of the installation surface 2 from 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 multiple tiers of first sub-mounts 16a, 16b, 16c, and 16d and a second sub-mount 21. The mount 15 is formed by stacking the multiple tiers of first sub-mounts 16a, 16b, 16c, and 16d 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 support columns 17.

[0021] The first insulating plate 18 is made of an insulating material such as glass epoxy resin or ceramic. The first insulating plate 18 may be made 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 downward in the direction of gravity, for example. The main surface 18q faces upward in the direction of gravity, for example. The main surface 18q is a mounting surface for the multiple submodules 10.

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

[0023] The longitudinal direction of each of the first columns 17 is the direction of gravity. ２ is the length L of the insulating struts 11 １ For example, each of the first columns 17 has a length L of less than 1 m. ２ The length L ２ is the length of each of the plurality of first struts 17 in the longitudinal direction of each of the plurality of first struts 17.

[0024] The second sub-mount 21 is detachably fixed to the first sub-mount 16d, which is the uppermost one of the multiple first sub-mounts 16a, 16b, 16c, and 16d. The second sub-mount 21 forms 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 made of an insulating material such as glass epoxy resin or ceramic. The second insulating plate 23 may be made 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 downward in the direction of gravity, for example. The main surface 23q faces upward in the direction of gravity, for example. The main surface 23q is a mounting surface for the tuned mass damper (TMD) 20.

[0026] The second insulating plate 23 is disposed farther 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 tiers of first sub-racks 16a, 16b, 16c, and 16d (i.e., the first sub-rack 16d that is the uppermost among the multiple tiers of first sub-racks 16a, 16b, 16c, and 16d). The second insulating plate 23 is disposed higher than the first insulating plate 18 of the first sub-rack 16d that is the uppermost among the multiple tiers of first sub-racks 16a, 16b, 16c, and 16d.

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

[0028] The second columns 22 are, for example, cylindrical members. The second columns 22 are formed of an insulating material such as fiber-reinforced plastic (FRP). The second columns 22 may be formed of the same material as the insulating columns 11 and the first columns 17. The longitudinal direction of each of the second columns 22 is the direction of gravity. The length L of the second columns 22 is ３ is the length L of the insulating struts 11 １ For example, each of the second columns 22 has a length L of less than 1 m. ３ The length L ３ is the length of each of the plurality of second struts 22 in the longitudinal direction of each of the plurality of second struts 22.

[0029] The plurality of 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 plurality of submodules 10 are connected in series.

[0030] The tuned mass damper 20 is installed 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 plurality of submodules 10 and the installation surface 2 in order to ensure an insulation distance between the plurality of submodules 10 and the installation surface 2. Therefore, as the maximum voltage (voltage class) handled by the power conversion device 1 increases, the length L of each of the plurality of insulating struts 11 also increases. １ 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 submodules 10 increases, and the weight of the power conversion device 1 increases. Due to this 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 conversion device 1 of this embodiment includes a tuned mass damper 20. Therefore, even if the maximum voltage (voltage class) handled by the power conversion device 1 increases and the height and weight of the center of gravity of the power conversion device 1 increase, the tuned mass damper 20 reduces the shaking of the power conversion device 1 during an earthquake. The earthquake resistance of the power conversion device 1 is improved. Furthermore, in order to improve the earthquake resistance of the power conversion device 1, it is not necessary to increase the number or thickness of the multiple insulating struts 11. Without changing the configuration of the multiple insulating struts 11, 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. The design burden of the power conversion device 1 is reduced.

[0033] The length L of each of the insulating struts 11 １When the height of the insulating struts 11 is 1 m or more and the insulating struts 11 are made of fiber-reinforced plastic (FRP), the insulating struts 11 are prone to bending. This, combined with the increase in the height and weight of the center of gravity 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, thereby improving the earthquake resistance of the power conversion device 1.

[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 struts 11, a mount 15, a plurality of submodules 10, and a tuned mass damper 20. The plurality of insulating struts 11 support the bottom insulating plate 12 relative to the installation surface 2. The mount 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 mount 15 includes multiple stages of first submounts 16a, 16b, 16c, and 16d. Each of the multiple stages of first submounts 16a, 16b, 16c, and 16d includes a first insulating plate 18 and a plurality of first struts 17 supporting the first insulating plate 18. The multiple submodules 10 are mounted on the bottom insulating plate 12 and the first insulating plate 18. The tuned mass damper 20 is installed on the mount 15. The insulating struts 11 each have a length L of 1 m or more. １ 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 struts 11 made of fiber-reinforced plastic are more flexible than the insulating struts made of metal. Furthermore, each of the insulating struts 11 has a length L of 1 m or more. １ , the height of the center of gravity of the power conversion device 1 increases. As a result, the power conversion device 1 will sway more strongly when an earthquake occurs. However, the power conversion device 1 of this embodiment is equipped with the tuned mass damper 20. This can improve the earthquake resistance of the power conversion device 1. Furthermore, without changing the configuration of the multiple insulating struts 11, 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. The design burden of the power conversion device 1 is reduced.

[0036] In the power conversion device 1 of this 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 to and detached from the frame 15. This makes it easy to attach and replace the tuned mass damper 20.

[0038] In the power conversion device 1 of this 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 that support the second insulating plate 23. The second insulating plate 23 is positioned farther from the installation surface 2 than the first insulating plate 18 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. The multiple second supports 22 are detachably fixed to the first insulating plate 18 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. 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 to and detached from the frame 15. This makes it easy to attach and replace the tuned mass damper 20.

[0040] Second Embodiment A power conversion device 1 according to a second embodiment will be described with reference to Fig. 4. The power conversion device 1 according to the second embodiment has the same configuration as the power conversion device 1 according to 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 Embodiment 1. 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 Embodiment 1. In this embodiment, the tuned mass damper 20 is disposed inside the frame 15. The tuned mass damper 20 is disposed between the first insulating plate 18 and the bottom insulating plate 12 of the first sub-frame 16d that is farthest from the installation surface 2 among the multiple first sub-frames 16a, 16b, 16c, and 16d (i.e., the topmost first sub-frame 16d among the multiple first sub-frames 16a, 16b, 16c, and 16d). For example, the tuned mass damper 20 is disposed between the first insulating plate 18 of the first sub-frame 16c and the first insulating plate 18 of the first sub-frame 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 tiers of 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 tiers of 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 farthest from the installation surface 2 among the multiple tiers of first sub-racks 16a, 16b, 16c, and 16d (i.e., the first sub-rack 16d that is the uppermost among the multiple tiers of first sub-racks 16a, 16b, 16c, and 16d) 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) that is disposed between the first insulating plate 18 of the first sub-rack 16d that is farthest from the installation surface 2 among the multiple tiers of first sub-racks 16a, 16b, 16c, and 16d (i.e., the first sub-rack 16d in the uppermost tier of the multiple tiers of first sub-racks 16a, 16b, 16c, and 16d) 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 plurality of second supports 22 is detachably fixed to a first insulating plate 18 (e.g., the first insulating plate 18 of the first sub-mount 16b) that is arranged between the first insulating plate 18 of the uppermost first sub-mount 16d of the plurality of first sub-mounts 16a, 16b, 16c, and 16d and the lowermost insulating plate 12. The lower end of each of the plurality of second supports 22 is screwed to a first insulating plate 18 (e.g., the first insulating plate 18 of the first sub-mount 16b) that is arranged between the first insulating plate 18 of the uppermost first sub-mount 16d of the plurality of first sub-mounts 16a, 16b, 16c, and 16d and the lowermost insulating plate 12.

[0045] 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 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-frame 16d, which is the farthest from the installation surface 2 among the multiple first sub-frames 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 this embodiment, the frame 15 further includes a second sub-frame 21. The second sub-frame 21 includes a second insulating plate 23 on which the tuned mass damper 20 is mounted, and a plurality of second support columns 22 that support the second insulating plate 23. The second sub-frame 21 is disposed between two adjacent first sub-frames (e.g., first sub-frame 16b and first sub-frame 16c) among the multiple stages of first sub-frames 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] Third Embodiment A power conversion device 1 according to a third embodiment will be described with reference to Fig. 5. The power conversion device 1 according to the present embodiment has a configuration similar to that of the power conversion device 1 according to the second embodiment and achieves similar effects, but differs mainly in the following respects.

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

[0052] The tuned mass damper 20 is installed on one of the first sub-mounts 16a, 16b, 16c, and 16d (e.g., 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 (e.g., the first sub-mount 16c) using screws or the like. Some of the sub-modules 10 are mounted on a main surface 18q of the first insulating plate 18 of one of the first sub-mounts 16a, 16b, 16c, and 16d (e.g., the first sub-mount 16c). In order to arrange some of the submodules 10 and the tuned mass damper 20 between the first submounts 16c and 16b, the first support columns 17 of the first submounts 16c are longer than the first support columns 17 of the other first submounts 16a, 16b, and 16d. The first support columns 17 of the first submounts 16c are shorter than the insulating support columns 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, on the main surface 18p of the first insulating plate 18 of the first sub-mount 16b, or 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, on the main surface 18q of the first insulating plate 18 of the first sub-mount 16c, on the main surface 18q of the first insulating plate 18 of the first sub-mount 16b, or 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 this embodiment, the tuned mass damper 20 is installed on one of the first sub-frames 16a, 16b, 16c, and 16d (for example, the first sub-frame 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 with improved earthquake resistance.

[0057] In the power conversion device 1 of the present embodiment, the first insulating plate 18 of one of the first sub-mounts 16a, 16b, 16c, and 16d (e.g., 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 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, and 16d (e.g., the first sub-mount 16c). Some of the multiple submodules 10 are mounted on the second main surface of the first insulating plate 18 of one of the first sub-mounts 16a, 16b, 16c, and 16d (e.g., the first sub-mount 16c).

[0058] Therefore, the tuned mass damper 20 can be installed on the frame 15 without interfering with the plurality of submodules 10. There is no need to change the number and arrangement of the plurality of 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 disclosed embodiments 1 to 3 should be considered to be illustrative in all respects and not restrictive. 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.

[0060] REFERENCE SIGNS LIST 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 power conversion device comprising: a bottom insulating plate; a plurality of insulating struts supporting the bottom insulating plate against an installation surface; a mount arranged on the opposite side of the bottom insulating plate from the installation surface and fixed to the bottom insulating plate; a plurality of sub-modules; and a tuned mass damper mounted on the mount, wherein the mount includes a plurality of stages of first sub-mounts, each of the plurality of stages including a first insulating plate and a plurality of first struts supporting the first insulating plate, the plurality of sub-modules being mounted on the bottom insulating plate and the first insulating plate, and each of the plurality of insulating struts having a length of 1 m or more and formed of fiber reinforced plastic.

2. The power conversion device according to claim 1, wherein the tuned mass damper is disposed farther from the installation surface than the mounting base.

3. The power conversion device described in claim 2, wherein the frame further includes a second sub-frame, the second sub-frame including a second insulating plate and a plurality of second supports supporting the second insulating plate, the second insulating plate being positioned farther from the installation surface than the first insulating plate of a first sub-frame among the plurality of stages that is farthest from the installation surface, the plurality of second supports being detachably fixed to the first insulating plate of the first sub-frame among the plurality of stages that is farthest from the installation surface, and the tuned mass damper is mounted on the second insulating plate.

4. The power conversion device described in claim 1, wherein the tuned mass damper is arranged between the first insulating plate and the bottom insulating plate of the first sub-frame that is farthest from the installation surface among the first sub-frames of the multiple stages.

5. The power conversion device described in claim 4, wherein the frame further includes a second sub-frame, the second sub-frame including a second insulating plate on which the tuned mass damper is mounted and a plurality of second supports supporting the second insulating plate, and the second sub-frame is disposed between two adjacent first sub-frames among the plurality of stages of first sub-frames.

6. The power conversion device according to claim 4, wherein the tuned mass damper is mounted on one of the first sub-frames of the plurality of stages.

7. A power conversion device as described in claim 6, wherein the first insulating plate of one of the first sub-frames of the multiple stages includes a first main surface facing the installation surface and a second main surface opposite the first main surface, the tuned mass damper is installed on the first main surface, and some of the multiple sub-modules are mounted on the second main surface.

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