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Method and device for overpressure bypass test of flexible and direct converter valves

A test method and test device technology, applied in the field of flexible power transmission and distribution, can solve problems such as jeopardizing the safe and stable operation of the system, overvoltage bypass of the bridge arm of the converter valve, and the failure of the AC circuit breaker to be disconnected normally.

Active Publication Date: 2019-12-20
XUJI GRP +3
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  • Abstract
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  • Application Information

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Problems solved by technology

However, due to the freewheeling characteristics of the anti-parallel diode of the device, the AC current will appear DC bias and continue to charge the bridge arm sub-module, resulting in the failure of the AC circuit breaker to disconnect normally, severe overvoltage of the converter valve sub-module, and even the converter valve The overall overvoltage bypass of the bridge arm endangers the safe and stable operation of the system

Method used

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  • Method and device for overpressure bypass test of flexible and direct converter valves
  • Method and device for overpressure bypass test of flexible and direct converter valves
  • Method and device for overpressure bypass test of flexible and direct converter valves

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Embodiment Construction

[0027] 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 embodiments.

[0028] Method example:

[0029] This embodiment provides a test method for the overpressure bypass of the flexible DC converter valve, which is aimed at such as figure 1 The test system shown performs the overvoltage bypass test.

[0030] Such as figure 1 As shown, the test system includes a first test branch, a second test branch and a charging branch connected in parallel. The first test branch is provided with a first sample valve and a reactor L1 in series, and the branch is provided with a first interface for connecting the first test valve; the second test branch is provided with a second test valve in series, And the branch is provided with a second interface for connecting the second sample valve; the charging branch is provided with a r...

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Abstract

The invention relates to a method and device for overpressure bypass test of flexible and direct converter valves, and the method comprises the following steps of firstly determining sub-modules to betested in a first valve assembly and a second valve assembly; charging a first auxiliary valve, a second auxiliary valve, a first test valve and a second test valve by using a charging branch; performing boost bypass operation on the sub-modules to be tested in the test valve by controlling the two test valves and the two auxiliary valves to trigger the over-voltage protection logic of the sub-modules after the voltage of the sub-modules to be tested rises to an over-voltage protection setting value, and controlling the sub-modules to be tested at the bypass to make the voltage of the sub-modules to be tested gradually decrease; and when the system current rapidly increases, triggering the over-current protection logic, and controlling all sub-modules to be blocked to make the current gradually decrease. The method is used to detect the stress characteristics of key components of the sub-modules under fault overvoltage and over-current and the correctness of the sub-module protectionlogic.

Description

technical field [0001] The invention belongs to the technical field of flexible power transmission and distribution, and in particular relates to a test method and device for an overvoltage bypass of a flexible DC converter valve. Background technique [0002] With the development of fully-controlled power electronic devices and the application of power electronics technology in power systems, the Voltage-Sourced Converter High Voltage Direct Current (VSC-HVDC) technology based on voltage source converters has attracted increasing attention. Modular Multilevel Converter (MMC) is a kind of voltage source converter in the application of flexible direct current transmission system. It is widely used in flexible direct current transmission and new energy access systems due to its remarkable advantages. [0003] Each converter bridge arm in the MMC direct current transmission project contains many sub-modules, and the sub-modules include capacitors and switching devices. When th...

Claims

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Application Information

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IPC IPC(8): G01R31/327
CPCG01R31/327
Inventor 胡四全范彩云韩坤司志磊夏克鹏张志刚刘路路周辉宣佳卓
Owner XUJI GRP
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