DC power transmission converter and DC power transmission conversion unit

Abstract

The DC power transmission converter (10) includes a power supply device (1), a base (2) on which the power supply device (1) is mounted, and a support (3) that supports the base (2). The support (3) includes a first support portion (31) and a second support portion (32). The first support portion (31) is fixed to the base (2). The second support portion (32) is detachably attached to the base (2).

Description

Technical Field

[0001] The present disclosure relates to a DC power transmission converter and a DC power transmission conversion unit.

Background Art

[0002] In a DC power transmission converter, a plurality of power supply devices called sub-modules are connected in series and installed on a pedestal. The pedestal is supported by a support that is an electrical insulator in order to be electrically insulated from the platform. The support is required to satisfy the seismic resistance of the DC power transmission converter.

[0003] For example, Japanese Patent Application Laid-Open No. 7-211858 (Patent Document 1) describes a thyristor valve in which a plurality of thyristor modules are mounted in multiple stages via a module support plate on an insulating column. In the thyristor valve described in this publication, an insulating reinforcement tube is inserted inside the end of the insulating column. Thereby, the seismic resistance of the insulating column is strengthened.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the thyristor valve described in the above publication, the insulating column is fixed to the module support plate. Therefore, the insulating column is permanently applied including during operation. Therefore, the insulating column leads to product design constraints and cost increases.

[0006] The present disclosure has been made in view of the above problems, and an object thereof is to provide a DC power transmission converter and a DC power transmission conversion unit that satisfy seismic resistance and can be temporarily applied.

Means for Solving the Problems

[0007] The DC power converter of this disclosure comprises a power supply unit, a frame on which the power supply unit is mounted, and a support structure for supporting the frame. The support structure includes a first support section and a second support section. The first support section is fixed to the frame. The second support section is detachably attached to the frame. [Effects of the Invention]

[0008] The DC power transmission converter of this disclosure satisfies seismic resistance requirements and can be applied temporarily. [Brief explanation of the drawing]

[0009] [Figure 1] This is a schematic front view showing the configuration of the DC power transmission converter according to Embodiment 1. [Figure 2] This is a schematic side view showing the configuration of a DC power transmission converter according to Embodiment 1. [Figure 3] This is an enlarged cross-sectional view along line III-III in Figure 1. [Figure 4] This is an enlarged view of section IV in Figure 1. [Figure 5] This is a schematic front view showing the configuration of the DC power transmission converter of Comparative Example 1. [Figure 6] This is a schematic side view showing the configuration of the DC power transmission converter of Comparative Example 1. [Figure 7] This is a schematic front view showing the configuration of the DC power transmission converter of Comparative Example 2. [Figure 8] This is a schematic side view showing the configuration of the DC power transmission converter in Comparative Example 2. [Figure 9] This is a schematic front view showing the configuration of the DC power transmission converter according to Embodiment 2. [Figure 10] This is a schematic side view showing the configuration of a DC power transmission converter according to Embodiment 2. [Figure 11] This is an enlarged cross-sectional view along the line XI-XI in Figure 9. [Figure 12] This is a schematic front view showing the configuration of the DC power transmission conversion unit according to Embodiment 3. [Figure 13] It is a front view schematically showing the configuration of a modification of the DC power transmission converter unit according to Embodiment 3.

Embodiments for Carrying Out the Invention

[0010] Hereinafter, embodiments will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and their description will not be repeated.

[0011] Embodiment 1. Referring to FIGS. 1 and 2, the configuration of the DC power transmission converter 10 according to Embodiment 1 will be described. The DC power transmission converter 10 according to Embodiment 1 is, for example, an offshore DC power transmission converter installed offshore. Note that the DC power transmission converter 10 according to Embodiment 1 may be, for example, an onshore DC power transmission converter installed onshore.

[0012] Also, the DC power transmission converter 10 according to Embodiment 1 is, for example, a high voltage direct current (HVDC) converter. Note that the DC power transmission converter 10 according to Embodiment 1 is not limited to a high voltage direct current converter.

[0013] The DC power transmission converter 10 according to Embodiment 1 includes a power supply device 1, a pedestal 2, and a support 3.

[0014] The power supply device 1 is called a sub-module. The power supply device 1 is installed on the pedestal 2. In the present embodiment, the DC power transmission converter 10 includes a plurality of power supply devices 1. The plurality of power supply devices 1 are electrically connected in series.

[0015] The pedestal 2 mounts the power supply device 1. The pedestal 2 is configured to be electrically insulated from the platform PL. The pedestal 2 is an insulator. In the present embodiment, the DC power transmission converter 10 includes a plurality of pedestals 2. In the present embodiment, a plurality of power supply devices 1 are mounted on each of the plurality of pedestals 2. In the present embodiment, the plurality of pedestals 2 are configured in multiple stages so as to overlap in the vertical direction.

[0016] The support 3 supports the pedestal 2. The support 3 is configured to support the power supply device 1 and the pedestal 2 on the platform PL. The support 3 includes a first support portion 31 and a second support portion 32. The first support portion 31 is fixed to the pedestal 2. The second support portion 32 is detachably attached to the pedestal 2.

[0017] The first support portion 31 is an insulator. This insulator is, for example, fiber reinforced plastic (FRP: Fiber Reinforced Plastics). The second support portion 32 is a non-insulator. This non-insulator is, for example, metal. More specifically, this non-insulator is, for example, steel, iron, etc. Also, it is possible to use an insulator for the second support portion 32. In this case, it is possible to use fiber reinforced plastic as this insulator.

[0018] Referring to FIGS. 1 to 3, the configurations of the first support portion 31 and the second support portion 32 will be described in detail.

[0019] In the present embodiment, the support 3 includes a plurality of first support portions 31 and second support portions 32. Specifically, the support 3 includes four first support portions 31 arranged at the four corners of the DC power transmission converter 10 in a plan view. Note that the number of the first support portions 31 is not limited to four. Also, specifically, the support 3 includes two second support portions 32 arranged at the central portion of the DC power transmission converter 10 in a plan view. Note that the number of the second support portions 32 is not limited to two.

[0020] The first support section 31 includes the first column section P1. In this embodiment, the first column section P1 is cylindrical in shape. However, the first column section P1 is not limited to a cylindrical shape. The first support section 31 includes a mounting member MM. The upper end of the first column section P1 is fixed to the uppermost frame 2. The center of the first column section P1 is fixed to multiple frame 2s. The lower end of the first column section P1 is fixed to the mounting member MM. The mounting member MM is attached to the platform PL.

[0021] The configuration of the second support portion 32 of the support 3 will be described in more detail with reference to Figures 3 and 4.

[0022] The second support portion 32 includes a second column portion P2. In this embodiment, the second column portion P2 is configured in a cylindrical shape. However, the second column portion P2 is not limited to a cylindrical shape. The second support portion 32 includes a flange F. The upper end of the second column portion P2 is detachably attached to the base 2 located at the lowest position. The lower end of the second column portion P2 is attached to the flange F. The flange F is located at the end of the second support portion 32 opposite to the base 2. The flange F is detachably attached to the platform PL by bolts B. In this embodiment, the flange F is configured in an annular shape. However, the flange F is not limited to an annular shape. In this embodiment, the flange F is detachably attached to the platform PL by a plurality of bolts B. The plurality of bolts B are arranged along the circumferential direction of the flange F with gaps between them.

[0023] Next, the effects and advantages of the DC power transmission converter 10 according to Embodiment 1 will be explained in comparison with a comparative example.

[0024] Referring to Figures 5 and 6, in the DC power transmission converter 10 of Comparative Example 1, the support 3 has only the first support portion 31. Therefore, the DC power transmission converter 10 of Comparative Example 1 has lower seismic resistance compared to the DC power transmission converter 10 according to Embodiment 1, which has the second support portion 32.

[0025] Referring to Figures 7 and 8, in the DC power transmission converter 10 of Comparative Example 2, the support 3 has a first support portion 31 and a second support portion 32. However, in the DC power transmission converter 10 of Comparative Example 2, the second support portion 32 is fixed to the frame 2. Therefore, in the DC power transmission converter 10 of Comparative Example 2, the second support portion 32 is permanently applied, including during operation as well as during transportation. Consequently, the second support portion 32 leads to product design constraints and increased costs.

[0026] In the DC power transmission converter 10 according to Embodiment 1, the support structure 3 includes a first support section 31 and a second support section 32. Therefore, compared to the case where the support structure 3 has only the first support section 31, the second support section 32 can satisfy seismic resistance requirements. Furthermore, the second support section 32 is detachably attached to the frame 2. Therefore, the second support section 32 can be applied temporarily.

[0027] In offshore DC converters, the platform PL is installed as a floating structure on the sea. Unlike land-based DC converters where the platform PL is installed on land, in offshore DC converters, vibrations are mitigated between the sea surface and the platform PL. Therefore, offshore DC converters have lower seismic resistance requirements during operation compared to land-based DC converters. Also, offshore DC converters are transported to the sea in an assembled state on land. Offshore DC converters have higher seismic resistance requirements during transport than during operation. Therefore, seismic resistance during transport can be improved by temporarily applying the second support section 32. On the other hand, by not applying the second support section 32 during operation, product design constraints and cost increases can be reduced compared to the case where the second support section 32 is permanently applied, including during operation.

[0028] Furthermore, when it is necessary to temporarily enhance the seismic resistance of an offshore DC converter due to a typhoon or other event, the seismic resistance of the offshore DC converter can be temporarily enhanced by temporarily applying the second support section 32. On the other hand, when the requirement for seismic resistance of the offshore DC converter decreases, such as after a typhoon has passed, not applying the second support section 32 can reduce product design constraints and cost increases compared to when the second support section 32 is permanently applied, including during operation.

[0029] As described above, in the DC power transmission converter 10 according to Embodiment 1, the second support section 32 can be applied temporarily, thereby temporarily increasing seismic resistance in response to seismic resistance requirements. Therefore, compared to the case where the second support section 32 is applied permanently, including during operation, product design constraints and cost increases can be suppressed.

[0030] In the DC power transmission converter 10 according to Embodiment 1, the second support part 32 is a non-insulating material. During operation, it is necessary to electrically insulate the frame 2 and the platform PL. On the other hand, during times other than operation, such as during transportation, it is not necessary to electrically insulate the frame 2 and the platform PL. Therefore, the non-insulating second support part 32 can be used when not in operation. By using a material with higher strength than an insulating material as the non-insulating material, the strength of the second support part 32 can be increased. In addition, by using a material that is cheaper than an insulating material as the non-insulating material, the cost of the second support part 32 can be reduced.

[0031] Furthermore, the offshore DC converter system may need to be shut down due to typhoons or other reasons. In this case, it is not necessary to electrically insulate the mounting frame 2 and the platform PL. Therefore, even in this case, a non-insulating second support section 32 can be used. By using a non-insulating material that has higher strength than an insulating material, the strength of the second support section 32 can be increased. Also, by using a non-insulating material that is less expensive than an insulating material, the cost of the second support section 32 can be reduced.

[0032] In the DC power transmission converter 10 according to Embodiment 1, the flange F is located at the end of the second support portion 32 opposite to the frame 2. Therefore, the flange F makes it easy to attach the second support portion 32 to the platform PL and easy to detach.

[0033] Embodiment 2. The DC power transmission converter 10 according to Embodiment 2 has the same configuration and effects as the DC power transmission converter 10 according to Embodiment 1, unless otherwise specified.

[0034] Referring to Figures 9 and 10, the configuration of the DC power transmission converter 10 according to Embodiment 2 will be described. In the DC power transmission converter 10 according to Embodiment 2, the second support portion 32 includes a jack structure J. The jack structure J includes a main body portion J1 and a movable portion J2. The movable portion J2 is movable relative to the main body portion J1. The movable portion J2 is configured to move between a state in contact with the frame 2 and a state away from the frame 2. The jack structure J is, for example, a hydraulic jack.

[0035] Referring to Figures 9 and 11, the second support portion 32 can press against the frame 2 and platform PL by the jack structure J. Therefore, the second support portion 32 can support the frame 2 while pressing against the frame 2 and platform PL by the jack structure J. Accordingly, in this embodiment, no bolts B are attached to the flange F.

[0036] Next, the effects and advantages of the DC power transmission converter 10 according to Embodiment 2 will be described. In the DC power transmission converter 10 according to Embodiment 2, the movable part J2 is configured to be movable between a state in contact with the frame 2 and a state away from the frame 2. This makes it easy to attach and detach the second support part 32 to the frame 2.

[0037] Embodiment 3. The DC power transmission conversion unit 100 according to Embodiment 3 has the same configuration and effects as the DC power transmission converter 10 according to Embodiment 1 or 2, unless otherwise specified.

[0038] Referring to Figure 12, the DC power transmission conversion unit 100 according to Embodiment 3 comprises a plurality of DC power transmission converters 10 according to Embodiment 1. The DC power transmission conversion unit 100 includes a connecting member C that connects each of the plurality of DC power transmission converters 10. The connecting member C is detachably attached to each of the plurality of DC power transmission converters 10.

[0039] The connecting member C is a non-insulating material. This non-insulating material is, for example, metal. More specifically, this non-insulating material is, for example, steel or iron. It is also possible to use an insulating material for the connecting member C. In this case, fiber-reinforced plastic can be used as the insulating material. The connecting member C is configured, for example, in the shape of a rod or a plate.

[0040] In this embodiment, the connecting member C is detachably attached to each of the mounting bases 2 of the multiple DC power converters 10. In this embodiment, the DC power converter unit 100 is equipped with multiple connecting members C. Each of the multiple connecting members C is detachably attached to the mounting base 2 of an adjacent DC power converter 10. The multiple connecting members C do not need to be attached to all of the multi-stage mounting bases 2. The multiple connecting members C may be attached to the multi-stage mounting bases 2 with one stage in between. Alternatively, the connecting members C may be detachably attached to each of the first support portions 31 of the multiple DC power converters 10.

[0041] Referring to Figure 13, a modified example of the DC power transmission conversion unit 100 according to Embodiment 3 will be described. The modified example of the DC power transmission conversion unit 100 according to Embodiment 3 includes a plurality of DC power transmission converters 10 according to Embodiment 2. In other words, the modified example of the DC power transmission conversion unit 100 according to Embodiment 3 has the same configuration as the DC power transmission conversion unit 100 according to Embodiment 3, except for the second support portion 32.

[0042] Next, the effects and advantages of the DC power transmission converter 10 according to Embodiment 3 will be described. In the DC power transmission conversion unit 100 according to Embodiment 3, the connecting member C is detachably attached to each of the multiple DC power transmission converters 10. Therefore, by connecting the multiple DC power transmission converters 10 to each other with the connecting member C, the base area of ​​the DC power transmission conversion unit 100 can be increased and the center of gravity can be stabilized.

[0043] Furthermore, the DC power transmission conversion unit 100 according to Embodiment 3 is equipped with the DC power transmission converter 10 according to Embodiments 1 and 2. Therefore, the DC power transmission converter 10 satisfies seismic resistance requirements and can be applied temporarily, and the base area of ​​the DC power transmission conversion unit 100 can be increased to stabilize the center of gravity.

[0044] Furthermore, the above embodiments can be combined as appropriate. The embodiments disclosed herein should be considered in all respects to be illustrative and not restrictive. The scope of this disclosure is indicated by the claims and not by the foregoing description, and all modifications within the meaning and scope of the claims are intended to be included. [Explanation of Symbols]

[0045] 1 Power supply unit, 2 Frame, 3 Support structure, 10 DC power transmission converter, 31 First support section, 32 Second support section, 100 DC power transmission conversion unit, B Bolt, C Connecting member, F Flange, J Jack structure, J1 Main body, J2 Movable section, P1 First column section, P2 Second column section, PL Platform.

Claims

1. A power supply device; A stand on which the power supply device is mounted; A support for supporting the frame, the support includes a first support portion and a second support portion, The first support portion is fixed to the base, The second support portion is detachably attached to the frame.

2. the first support portion is an insulator, The DC transmission converter according to claim 1 , wherein the second support portion is made of a non-insulating material.

3. The second support portion includes a flange, The DC power transmission converter according to claim 1 , wherein the flange is disposed at an end of the second support portion opposite to the frame.

4. The second support includes a jack structure, The jack structure includes a main body portion and a moving portion movable relative to the main body portion, The DC power transmission converter according to claim 1 , wherein the moving section is configured to be movable between a state in contact with the pedestal and a state away from the pedestal.

5. A power transmission system comprising a plurality of the DC power transmission converters according to claim 1 or 2, a coupling member that couples each of the plurality of DC power transmission converters to each other; The connecting member is detachably attached to each of the plurality of DC power transmission converters.

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