Device and method for testing multi-wave fault current testing device in converter valve operating test

Abstract

The invention discloses a device and a method for testing a multi-wave fault current testing device in a converter valve operating test. The device comprises a generator return circuit, wherein the generator return circuit consists of a short circuit generator, a breaker, a reactor, a resistor and a primary side of a step-up transformer which are connected in series; a secondary side of the step-up transformer is connected with a wave-modulated branch and a converter valve to be tested in parallel respectively, and the wave-modulated branch consists of the breaker, a wave-modulated capacitor and a wave-modulated resistor which are connected in series; the low potential of the secondary side of the step-up transformer is earthed; and the converter valve to be tested is also connected with a current source and a voltage source, and the converter valve to be tested is connected with the output ends of the current source and the voltage source respectively to form the return circuit. The testing device has the advantages of accurately testing the test waveforms of the converter valve and providing reliable test data for the improvement of the performance of the converter valve along with simple structure and easy realization. In addition, the device and the method are applied to various tests of the converter valve connected with high-power thyristors in series, and provide powerful guarantee for the independent research and development of the converter valve.

Description

technical field [0001] The invention belongs to the technical field of high-voltage direct current transmission thyristor valves for power transmission systems, and relates to a fault current test method, in particular to a multi-wave fault current test method for high-voltage direct current transmission thyristor valve operation tests. Background technique [0002] With the needs of the development of the power system, my country's high-voltage direct current transmission projects are developing rapidly. The core of the converter station of the direct current transmission project is the converter valve connected in series with high-power thyristor devices. The quality of this equipment directly affects the reliability of the power transmission and transformation system. The cost generally accounts for about 25% of the total project investment. Converter valve equipment needs to be localized, and having test methods is an important guarantee for independent research and devel...

AI Technical Summary

Problems solved by technology

In the operating condition of the DC converter station, flashover may occur due to the insulation damage of the converter valve or the thyristor of the valve group loses the blocking ability. Although these phenomena rarely occur, once they occur, the consequences will be extremely serious , the valve fault current test project is to reproduce the short-circuit fault situation in which the current passes through the converter valve for one cycle and then conducts or does not conduct for three cycles after a short-circuit fault occurs suddenly in a bridge arm.

Images