A distribution network flexible DC converter

Abstract

The present invention relates to a distribution network flexible direct current converter, which belongs to the field of power electronic technology application. The device includes a container body, a reactor room, a water cooling cabinet, a control cabinet, a switch cabinet, a starter cabinet, a DC interface cabinet, a power module, a power module support frame, and a reactor. The water cooling cabinet, the control cabinet, the switch cabinet, the starter cabinet, the DC interface cabinet, the power module, and the power module support frame are arranged in two rows in the container body. The device has excellent structural strength, space utilization, sealing, and module overall transportation advantages.

Description

Technical Field

[0001] The invention belongs to the field of power electronic technology application, and in particular relates to a distribution network flexible direct current converter. Background Art

[0002] Modular Multilevel Converter (MMC) technology is increasingly being adopted and applied by power systems due to its unique advantages in the fields of renewable energy grid connection, island power supply, asynchronous grid interconnection, multi-terminal DC transmission, and urban distribution network capacity expansion. The Shanghai Nanhui Flexible DC Project, Nan'ao Flexible DC Project, Zhoushan Flexible DC Project, Xiamen Flexible DC Project, and Luxi Flexible DC Project that have been put into operation all adopt MMC topology. The above-mentioned flexible DC projects all adopt valve tower structure, occupy a large area, and require a lot of on-site installation and commissioning work.

[0003] In view of this, providing a distribution network flexible DC converter that can be installed and debugged in a factory and plug-and-play on site has very important practical significance.

[0004] There are relatively few application cases in which all equipment including the control and protection system, water cooling system, reactor, switch cabinet, starting cabinet, converter valve, etc. of the flexible DC converter are integrated and installed in a container. Summary of the invention

[0005] The purpose of the present invention is to provide a structural solution for a distribution network flexible DC converter, which can reduce the footprint of the equipment and facilitate the maintenance of the equipment.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a distribution network flexible DC converter, mainly comprising a container body (1), a reactor room (2), a water cooling cabinet (3), a control cabinet (4), a switch cabinet (5), a starter cabinet (6), a DC interface cabinet (7), a power module (8), a power module support frame (9), and a reactor (10);

[0007] The reactor room (2), water cooling cabinet (3), control cabinet (4), switch cabinet (5), starter cabinet (6), DC interface cabinet (7), power module (8), and power module support frame (9) are arranged in two rows in the container body (1); a maintenance passage (11) is provided between the two rows;

[0008] The reactor (10) is arranged in a reactor chamber (2); a side of the reactor chamber (10) close to the box body is provided with ventilation and heat dissipation holes (12).

[0009] In the above solution, the width of the inspection passage is greater than or equal to 0.2 meters and less than or equal to 2 meters.

[0010] In the above solution, a filter screen (13) is also provided on the side of the reactor chamber (10) close to the box body.

[0011] In the above scheme, a reactor chamber door (30) is provided on a side of the reactor chamber (2) close to the box body; a ventilation and heat dissipation hole (12) and a filter (13) are provided at the lower middle portion of the reactor chamber door (30).

[0012] In the above solution, a ventilation fan (14) and a rain cover (15) are provided on the top of the reactor chamber (2).

[0013] In the above solution, the isolation plate (31) of the reactor chamber (2) can be made of metal material or insulating material.

[0014] In the above solution, the power module support frame (9) is multi-layered, with a plurality of power modules (8) placed on each layer.

[0015] In the above solution, an air cooler (17) is installed on the top of the container body (1).

[0016] In the above solution, doors (18) are provided on two side surfaces of the container body (1).

[0017] In the above solution, an air conditioner (19) can be installed on the door (18) on the side of the container body (1).

[0018] In the above solution, the number of the water cooling cabinet (3), the control cabinet (4), the switch cabinet (5), the starter cabinet (6), and the DC interface cabinet (7) is 1, 2, or more.

[0019] In the above solution, the reactor chamber (2) is provided with one, two or more.

[0020] In the above solution, the power module support frame (9) is provided with a protective net (20) on the side close to the maintenance passage (11).

[0021] In the above solution, the protective net (20) is made of metal.

[0022] In the above solution, when there is more than one reactor chamber (2) in the container (1), the reactor chambers (2) are arranged on one side or scattered on both sides.

[0023] In the above scheme, the reactor (10) is cooled by forced air cooling; the power module (8) is cooled by a water cooling system; and other equipment is cooled by air conditioning.

[0024] The beneficial effects of the present invention are:

[0025] 1) Conventional container-type power electronic equipment such as SVG is arranged in a single row, which has a simple structure and is convenient for maintenance. There are many converter devices. If a single row arrangement is adopted, the length of the container is too long and cannot meet the production and transportation requirements. To solve this problem, the present invention provides a double row arrangement solution that is convenient for maintenance. A maintenance channel is reserved between the two rows of equipment.

[0026] 2) The heat generated by the reactor of the converter is more than ten kilowatts or even dozens of kilowatts. If an air-conditioning cooling solution is adopted, a large-capacity air-conditioner needs to be configured. The air-conditioning equipment is expensive, occupies a large area, and consumes a lot of electricity. If forced air cooling is adopted, a large amount of dust and moisture will be brought into the container, greatly affecting the normal use of other equipment. The present invention provides a structural solution with multiple enclosed spaces, which effectively solves this problem. The reactor is in a separate space and is cooled by forced air cooling. The flexible DC converter valve is cooled by a water cooling system. Other equipment is cooled by air conditioning. The device has excellent structural strength, space utilization, and sealing.

[0027] 3) Generally, metal materials are used in closed isolation spaces, and after the reactor is placed inside, a large insulation distance and electromagnetic eddy current safety distance need to be considered. The present invention uses insulating materials as the partitions of the reactor room, which effectively reduces these safety distances and further reduces the overall size of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is an internal top view of the distribution network flexible DC converter of the present invention.

[0029] Figure 2 This is a front view of the appearance of the distribution network flexible DC converter of the present invention.

[0030] Figure 3 This is the right view of the appearance of the distribution network flexible DC converter of the present invention. DETAILED DESCRIPTION

[0031] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0032] The specific implementation scheme of the distribution network flexible DC converter of the present invention is as follows: Figures 1 to 3 shown.

[0033] The water cooling cabinet (3), control cabinet (4), switch cabinet (5), starter cabinet (6), DC interface cabinet (7), power module (8), power module support frame (9), and reactor room (2) of the distribution network flexible DC converter are arranged in two rows in the container body (1). There is an inspection channel (11) between the two rows. In this embodiment, the width of the inspection channel is 1 meter.

[0034] In this embodiment, the container (1) has two reactor chambers (2). The lower part of the reactor chamber door (30) is provided with ventilation and heat dissipation holes (12) and a filter (13), and the top of the reactor chamber (2) is provided with a ventilation fan (14) and a rain cover (15). The isolation plate (31) of the reactor chamber (2) can be made of insulating material.

[0035] When there is more than one reactor room (2) in the container (1), they can be arranged on one side or scattered on both sides.

[0036] The reactor is in a separate room and is cooled by forced air. The flexible DC converter valve is cooled by a water cooling system. Other equipment is cooled by air conditioning.

[0037] The power module support frame (9) is divided into two rows and arranged on both sides of the container. The power module support frame (9) is divided into three layers, and a plurality of power modules (8) are placed on each layer. The power module support frame (9) is provided with a metal protective net (20) near the maintenance passage (11).

[0038] An air cooler (17) is installed on the top of the container body (1).

[0039] The two sides of the container body (1) are provided with doors (18), and air conditioners (19) are installed on the doors (18).

[0040] The above embodiments are only for illustrating the technical concept of the present invention and cannot be used to limit the protection scope of the present invention. A person skilled in the art should understand that any modification or equivalent replacement of the specific implementation of the present invention without departing from the technical concept and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A distribution network flexible DC converter, characterized in that: It comprises a container body (1), a reactor room (2), a water cooling cabinet (3), a control cabinet (4), a switch cabinet (5), a starter cabinet (6), a DC interface cabinet (7), a power module (8), a power module support frame (9), and a reactor (10); The reactor room (2), water cooling cabinet (3), control cabinet (4), switch cabinet (5), starter cabinet (6), DC interface cabinet (7), power module (8), and power module support frame (9) are arranged in two rows in the container body (1); a maintenance passage (11) is provided between the two rows; The reactor (10) is arranged in the reactor chamber (2); a ventilation and heat dissipation hole (12) is provided on a side of the reactor chamber (10) close to the box body; The reactor (10) is cooled by forced air cooling; the power module (8) is cooled by a water cooling system; and other equipment is cooled by air conditioning.

2. The distribution network flexible DC converter according to claim 1, characterized in that: The width of the inspection passage is greater than or equal to 0.2 meters and less than or equal to 2 meters.

3. The distribution network flexible DC converter according to claim 1, characterized in that: A filter screen (13) is also provided on a side of the reactor chamber (10) close to the box body.

4. The distribution network flexible DC converter according to claim 1, characterized in that: A reactor chamber door (30) is provided on one side of the reactor chamber (2) close to the box body; a ventilation and heat dissipation hole (12) and a filter (13) are provided in the lower middle portion of the reactor chamber door (30).

5. The distribution network flexible DC converter according to claim 1, characterized in that: The top of the reactor chamber (2) is provided with a ventilation fan (14) and a rain cover (15).

6. The distribution network flexible DC converter according to claim 1, characterized in that: The isolation plate (31) of the reactor chamber (2) is made of metal material or insulating material.

7. The distribution network flexible DC converter according to claim 1, characterized in that: The power module support frame (9) is multi-layered, with a plurality of power modules (8) placed on each layer.

8. The distribution network flexible DC converter according to claim 1, characterized in that An air cooler (17) is installed on the top of the container body (1).

9. The distribution network flexible DC converter according to claim 1, characterized in that: Doors (18) are provided on two side surfaces of the container body (1).

10. The distribution network flexible DC converter according to claim 9, characterized in that: An air conditioner (19) is installed on the door (18) on the side of the container body (1).

11. The distribution network flexible DC converter according to claim 1, characterized in that: The number of the water cooling cabinet (3), the control cabinet (4), the switch cabinet (5), the starting cabinet (6), and the DC interface cabinet (7) is one or more.

12. The distribution network flexible DC converter according to claim 1, characterized in that: One or more reactor chambers (2) are provided.

13. The distribution network flexible DC converter according to claim 1, characterized in that: The power module support frame (9) is provided with a protective net (20) on the side close to the maintenance passage (11).

14. The distribution network flexible DC converter according to claim 13, characterized in that: The protective net (20) is made of metal.

15. The distribution network flexible DC converter according to claim 12, characterized in that: When there is more than one reactor chamber (2) in the container (1), the reactor chambers (2) are arranged on one side or scattered on both sides.

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