CN215498722U

CN215498722U - Automatic bypass device of 35kV direct-hanging SVG power unit

Info

Publication number: CN215498722U
Application number: CN202121139812.6U
Authority: CN
Inventors: 裴宝峰; 侯荣芳; 阮敬稳; 李志刚; 苏刘军; 姜圆九; 姚海嘉
Original assignee: Windsun Science and Technology Co Ltd
Current assignee: Windsun Science and Technology Co Ltd
Priority date: 2021-05-26
Filing date: 2021-05-26
Publication date: 2022-01-11
Anticipated expiration: 2031-05-26

Abstract

The utility model provides a 35kV direct-hanging SVG power unit automatic bypass device, relates to SVG power unit technical field, has solved the not high problem of SVG power unit bypass reliability, including bypass contactor, drive power module, second grade isolation transformer, one-level isolation transformer, optic fibre expansion board and UPS module, bypass contactor be connected with SVG power unit, drive power module be connected with bypass contactor, second grade isolation transformer be connected with drive power module, one-level isolation transformer be connected with second grade isolation transformer, UPS module be connected with one-level isolation transformer; each driving power supply module has 35kV of withstand voltage requirement on the ground, two-stage isolation transformers are used for supplying power, the cost is reduced through grouping and grading design, and the reliability of a bypass system is improved.

Description

Automatic bypass device of 35kV direct-hanging SVG power unit

Technical Field

The utility model relates to a direct-hanging type SVG power unit, in particular to an automatic bypass device of a 35kV direct-hanging type SVG power unit.

Background

At present, the 35kV direct hanging type SVG is the best scheme of high-capacity and rapid dynamic reactive compensation, and is increasingly applied to various rows and industries. Compared with the 35kV voltage reduction type SVG, the power of the 35kV direct hanging type SVG can be larger; at the same time, the number of cascaded power cells per phase also increases significantly, with a typical design having 40 power cells per phase.

After the number of 35kV direct-hanging SVG power units is increased, the failure rate of the whole machine is increased, and the power system equipment needs to work stably for a long time, so that the reliability of the whole machine needs to be improved. Under the condition of the inherent failure rate of the device, the bypass of the power unit is an effective method for improving the reliability of the whole machine.

The conventional SVG manual bypass technology needs to stop the main power after a fault, and adopts a mode of manually installing a short circuit copper bar to bypass, so that the method is time-consuming, labor-consuming and long in operation time. The existing automatic bypass technology adopts a bypass contactor which is used for taking power from a power unit and driving a machine to be kept to be switched on when a fault occurs, the method is limited by the voltage of the power unit when the fault occurs, if the voltage of the power unit is abnormal when the fault occurs, the abnormal execution of electric switching-on can occur, and the reliability of the bypass is not high; in addition, the main power needs to be stopped and the brake needs to be manually opened, so that the device has great limitation. And in addition, a mode of alternately taking electricity from adjacent units is adopted, after a power unit fails, electricity is taken from the adjacent units to drive the bypass contactor to be switched on, the problem of uneven voltage of the units is easy to occur, and the working stability of the SVG complete machine is influenced.

Disclosure of Invention

In order to solve the problems, the utility model provides a 35kV direct-hanging type SVG power unit automatic bypass device, a driving power module of a bypass contactor does not take electricity from a power unit, a primary isolation transformer and a secondary isolation transformer are adopted for grouping and grading external power supply for supplying power, the automatic bypass device has no influence on the operation of the power unit on the whole machine, and the voltage of a direct current bus of a fault power unit is not dependent; the utility model can realize the reliable and automatic bypass without stopping when the fault occurs. In order to achieve the purpose, the utility model adopts the technical scheme that: the utility model provides an automatic bypass device of 35kV direct-hanging SVG power unit, includes bypass contactor, drive power module, secondary isolation transformer, one-level isolation transformer, optic fibre expansion board and UPS module, bypass contactor be connected with SVG power unit, drive power module be connected with bypass contactor, secondary isolation transformer be connected with drive power module, one-level isolation transformer be connected with secondary isolation transformer, UPS module be connected with one-level isolation transformer, optic fibre expansion board be connected with drive power module through optic fibre for each drive power module is forwarded to the bypass instruction of former SVG controller, optic fibre expansion board is connected with the SVG controller, is used for receiving the bypass instruction of SVG controller.

When a certain power unit of the SVG fails, the power unit uploads failure information to the SVG controller. After the SVG controller is analyzed by the algorithm, the bypass control instruction is issued to the optical fiber expansion board through the optical fiber or other communication interfaces. The optical fiber expansion board transfers the received bypass control instruction to the driving power supply module of the corresponding power unit through the optical fiber. And the driving power supply module drives the bypass contactor according to the received instruction, so that the automatic bypass function of the fault power unit is realized. After the fault power unit is overhauled or the bypass is manually removed, a bypass removing instruction can be issued through the SVG controller, and the electric bypass removing is realized.

Further, bypass contactor, drive power supply module and second grade isolation transformer constitute bypass execution unit, bypass execution unit's quantity equal with SVG power unit's quantity, bypass contactor's output is parallelly connected with the output that corresponds SVG power unit for SVG power unit after the bypass trouble.

Furthermore, the bypass execution units are sequentially divided into a plurality of groups according to the arrangement sequence, the primary sides of the secondary isolation transformers in each group are connected in parallel, the secondary sides of the secondary isolation transformers in each group are connected with the driving power supply modules to provide isolated alternating current power supplies for the driving power supply modules, and the isolation voltage meets the voltage withstanding requirement in each group.

Furthermore, the number of primary isolation transformers is equal to that of the bypass execution units, the primary side of each primary isolation transformer is connected with the output of the UPS module, and the UPS module provides a high-reliability alternating current power supply; the secondary of the primary isolation transformer is connected with the primary of the secondary isolation transformer to provide a high-isolation alternating current power supply for each group of secondary isolation transformers, and the isolation voltage meets the withstand voltage requirement of 35 kV.

Furthermore, the driving power supply module comprises a power supply circuit, an optical fiber signal receiving circuit and a contactor driving circuit, the driving power supply module is connected with the optical fiber expansion board through optical fibers and used for receiving a bypass instruction, the contactor driving circuit is connected with the bypass contactor and drives the bypass contactor according to the received bypass instruction, and electric switching-on or electric switching-off is achieved.

Compared with the prior art, the utility model has the following beneficial effects: the automatic bypass device does not need to modify the software, hardware and structure of the existing power unit, is compatible in design, and is convenient to select, match and produce for stock. Each driving power supply module does not get electricity from the SVG power unit, but gets working power supply from the power unit, and the automatic bypass device of this design can not influence the work of power unit, also can not lead to bypass contactor closing abnormity because the trouble power unit fault voltage is low. Each driving power supply module has 35kV of withstand voltage requirement on the ground, two-stage isolation transformers are used for supplying power, the cost is reduced through grouping and grading design, and the reliability of a bypass system is improved.

Drawings

The present invention is described in further detail below with reference to the attached drawings.

FIG. 1 is a schematic of the topology of the present invention;

fig. 2 is a schematic structural diagram of a bypass contactor and a SVG power unit bypass.

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described with reference to fig. 1 and 2 and specific examples.

As shown in attached figure 1 and attached figure 2, an automatic bypass device of 35kV direct-hanging SVG power unit, including bypass contactor, drive power supply module, second grade isolation transformer, one-level isolation transformer, optic fibre expansion board and UPS module, bypass contactor, drive power supply module and second grade isolation transformer constitute bypass execution unit, bypass execution unit's quantity equal with SVG power unit's quantity, bypass contactor's output is parallelly connected with the output that corresponds SVG power unit for SVG power unit after the bypass trouble.

Furthermore, the driving power supply module comprises a power supply circuit, an optical fiber signal receiving circuit and a contactor driving circuit, the driving power supply module is connected with the optical fiber expansion board through optical fibers and used for receiving a bypass instruction, the contactor driving circuit is connected with the bypass contactor and drives the bypass contactor according to the received bypass instruction, and electric switching-on or electric switching-off is achieved. The other two phases are the same and share a USP module with phase A.

The working principle and the working process of the utility model are as follows: take SVG power cell a1_1 fault auto-bypass as an example. As shown in fig. 1, after power cell a1_1 fails, power cell a1_1 uploads the failure information to the SVG controller. After the SVG controller is analyzed by the algorithm, the bypass control instruction of the power unit A1_1 is sent to the optical fiber expansion board through the optical fiber or other communication interfaces. The optical fiber expansion board transfers the received bypass control instruction to the driving power module corresponding to the power unit A1_1 through an optical fiber, and the driving power module drives the bypass contactor corresponding to the power unit A1_1 according to the received instruction, and finally, the automatic bypass of the fault of the power unit A1_1 is realized. After the fault power unit is overhauled or the bypass is artificially removed, the bypass removing instruction can be issued by the original SVG controller, and the electric bypass removing is realized.

The technical solutions of the present invention or similar technical solutions designed by those skilled in the art based on the teachings of the technical solutions of the present invention are all within the scope of the present invention.

Claims

1. The utility model provides an automatic bypass device of 35kV direct-hanging SVG power unit, includes bypass contactor, drive power module, second grade isolation transformer, one-level isolation transformer, optic fibre expansion board and UPS module, characterized by bypass contactor be connected with SVG power unit, drive power module be connected with bypass contactor, second grade isolation transformer be connected with drive power module, one-level isolation transformer be connected with second grade isolation transformer, UPS module be connected with one-level isolation transformer, optic fibre expansion board be connected with drive power module through optic fibre for each drive power module is forwarded to the bypass instruction of former SVG controller, optic fibre expansion board is connected with the SVG controller, is used for receiving the bypass instruction of SVG controller.

2. The automatic bypass device of the 35kV direct-hanging SVG power unit according to claim 1, characterized in that bypass contactor, driving power module and secondary isolation transformer constitute bypass execution units, the number of said bypass execution units equals to the number of SVG power units, the output of bypass contactor is connected in parallel with the output of corresponding SVG power unit for bypassing the SVG power unit after a fault.

3. The automatic bypass device for the 35kV vertical hanging type SVG power unit as claimed in claim 2, wherein the bypass execution units are sequentially divided into several groups according to the arrangement order, the primary sides of the secondary isolation transformers in a group are connected in parallel, and the secondary sides of the secondary isolation transformers in a group are connected with the driving power supply modules to provide isolated AC power supply for each driving power supply module.

4. The automatic bypass device of 35kV vertical hanging SVG power unit according to claim 2, characterized in that the number of primary isolation transformers is equal to the number of bypass execution units, the primary of primary isolation transformers is connected to the output of UPS module, the UPS module provides high reliable AC power; the secondary of the primary isolation transformer is connected with the primary of the secondary isolation transformer to provide high-isolation alternating current power supply for each group of secondary isolation transformers.

5. The 35kV direct-hanging type SVG power unit automatic bypass device according to claim 1, characterized in that the driving power module comprises a power circuit, an optical fiber signal receiving circuit, a contactor driving circuit, the driving power module is connected with the optical fiber expansion board through optical fibers for receiving bypass instructions, the contactor driving circuit is connected with the bypass contactor, the bypass contactor is driven according to the received bypass instructions, and electric switching-on or electric switching-off is realized.