Fault current composite test method for high-voltage direct current power transmission converter valve

Abstract

The invention provides a fault current composite test method for a high-voltage direct current power transmission converter valve. According to the method, a rectification current source supplies heating current to a test sample valve Vt before supplying fault current; and the fault current is supplied to the test sample valve Vt by using a mode of compositing short circuit current of a direct current source and discharge current of an additional power supply. By the technical scheme, the short circuit current of a heating current source is utilized fully, so that the designed maximum output current value of the additional fault current source is reduced, the utilization efficiency of a test circuit is improved, the cost is saved, and the fault current can be adjusted in a large range; and furthermore, a test requirement on the fault current of the converter valves in the conventional high-voltage direct current engineering and the extra-high-voltage direct current engineering can be met, and the method is high in generality.

Description

Technical field [0001] The invention belongs to the field of power transmission of electric power systems, and specifically relates to a DC converter valve test method, in particular to a high-voltage DC transmission converter valve fault current composite test method. Background technique [0002] As a high-efficiency power transmission method, HVDC technology is increasingly widely used in power systems, and significantly changes the structure of the transmission grid and improves the performance of the grid. As the voltage and transmission capacity of the HVDC transmission system increase, the reliability of its key equipment, the DC converter valve, has become particularly important, especially its ability to withstand various extreme currents, voltages, and thermal stresses under fault conditions. The necessary means to inspect and improve the reliability of converter valves is to carry out type tests. In the converter valve type test, the main purpose of the fault current ...

AI Technical Summary

Problems solved by technology

[0005] At present, ABB Company and Siemens Company generally use the synthesis method to carry out the DC converter valve operation test: use the 6-pulse rectifier bridge of the large current circuit to provide the required fault current by simulating the short circuit of the bridge arm, and the resonant high voltage circuit to provide the required test voltage. Using this test method, the test has a great impact on the power supply system, and at the same time requires the power supply system to have a ve

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