Single-wave fault current testing device of converter valve running test and testing method

Abstract

The invention discloses a single-wave fault current testing device of a converter valve running test and a testing method. The device comprises a generator loop, wherein the generator loop comprises a short-circuit generator, a circuit breaker, a reactor L, a resistor and a primary side of a step-up transformer, which are sequentially connected in series; the secondary side of the step-up transformer is connected with a tested converter valve in parallel, and a low-potential end of the secondary side of the step-up transformer is grounded; and the tested converter valve is also connected with a current source and a voltage source and respectively connected with the output ends of the current source and the voltage source to form a loop. The device is used for checking the converter valve as key equipment in a direct current transmission system, has the advantages of simple structure and easy realization, can be used for precisely detecting the test waveform of the converter valve and provides reliable test data for improving the property of the converter valve. The invention is suitable for tests of various converter valves connected with high-power thyristor devices in series and provides powerful guarantee for the independent research and development of the converter valves.

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 single-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 deve...

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.

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