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A flexible DC converter valve short-circuit current test system

A technology of short-circuit current and flexible direct current, applied in the direction of circuit breaker testing, measuring electricity, measuring electric variables, etc., can solve problems such as inaccurate short-circuit test results

Active Publication Date: 2022-05-20
XUJI GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a flexible DC converter valve short-circuit current test system, which is used to solve the problem of inaccurate short-circuit test results based on the existing LC oscillating circuit

Method used

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  • A flexible DC converter valve short-circuit current test system
  • A flexible DC converter valve short-circuit current test system
  • A flexible DC converter valve short-circuit current test system

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Embodiment Construction

[0015] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0016] This embodiment provides a flexible DC converter valve short-circuit current test system. By adopting the energy storage and power electronic power conversion scheme, the output test current can be closed-loop controlled, the injected current energy can meet the special requirements of the project, and the construction cost of the test system is low. Purpose.

[0017] The flexible DC converter valve short-circuit current test system includes a rectifier unit, a control switch, an energy storage unit, a Buck converter and a thyristor valve. Among them, the input side of the rectifier unit is used to connect to the power grid, the output side of the rectifier unit is connected to the energy storage unit through a control switch, the e...

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Abstract

The invention relates to a flexible DC converter valve short-circuit current test system, which includes a rectification unit, the input side of the rectification unit is used to connect to the power grid, the output side of the rectification unit is connected to an energy storage unit through a control switch, and the energy storage unit is connected to a Buck converter. The input terminal and the output terminal of the Buck converter are used to connect the MMC valve to be tested. The output terminal of the Buck converter is connected to the MMC valve to be tested through a thyristor valve. The energy storage unit, the Buck converter and the thyristor valve are supported by an insulating platform. ground insulation. The present invention closes the control switch before the short-circuit test starts, so that the power grid can charge and store energy for the energy storage unit through the rectification unit. After the energy storage is completed, the control control switch is turned off to isolate the energy storage unit from the power grid; During the process, the electric energy stored in the energy storage unit outputs a controllable short-circuit test current through the Buck converter. The short-circuit test current can meet the requirements of the flexible DC engineering test and improve the accuracy of the short-circuit test results.

Description

technical field [0001] The invention relates to a short-circuit current test system for a flexible direct current converter valve, belonging to the technical field of flexible direct current transmission converter valve tests. Background technique [0002] The core equipment of flexible direct current transmission (VSC-HVDC) is the flexible direct current transmission converter valve, also called modular multiple-level converter valve (MMC valve). The basic component unit of the MMC valve is called a sub-module (SM), and the circuit diagram of the sub-module is as follows figure 1 shown. Before engineering application, the MMC valve must undergo a type test. As an important test item in the type test, the short-circuit current test mainly assesses the anti-parallel diode of the IGBT under the MMC valve and the protection device ( figure 1 Whether the flow capacity and action logic of diode D1 and bypass thyristor T) meet the product design requirements. The product design ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/327
CPCG01R31/3272Y02E60/60
Inventor 胡四全常忠廷甄帅张坤徐涛邱育林王铎王梁胡少花马莉
Owner XUJI GRP