Testing method and device of thyristor switching stress

Abstract

The invention provides a testing method and device of thyristor switching stress, which has comprehensive functions and meets the testing requirements of the thyristor switching stress under various working conditions of a converter valve. Moreover, the topological structure of a circuit is simple and practical, the required equipment capacity is small, and the device cost is low. The testing for a single thyristor is directly carried out by the method, the capability of each thyristor inside for enduring switching voltage and current can be checked before the converter valve is assembled, and therefore the producing and manufacturing safety and economical property of the converter valve are improved. In addition, the testing strength of electrothermal stress can be improved by adjusting testing parameters by the method, and therefore the limiting tolerance value of the thyristor switching stress can be known through continuous tests, and bases are provided for the optimal design of a converter-valve system.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a thyristor turn-on stress test method and device. Background technique [0002] The converter valve is the core equipment of the DC transmission system. Since the 1970s, the converter valve with the thyristor as the core switching device has gradually been widely used. When the converter valve is turned on, a large surge current will flow into its internal thyristor, and excessive current and di / dt may cause damage to the thyristor. Therefore, for the converter valve system that has been designed, it is of great significance to ensure the long-term stable operation of the converter valve to verify whether the thyristor can withstand the opening current stress by means of tests. According to the IEC60700 standard, the turn-on stress of the thyristor is an important assessment index for the type test and routine test of the converter valve, but it is based o...

AI Technical Summary

Problems solved by technology

According to the IEC60700 standard, the turn-on stress of the thyristor is an important assessment index for the type test and routine test of the converter valve, but it is based on the overall structure of the valve module, and the test assessment of the turn-on stress of a single thyristor is lacking.

And if a thyristor breaks down or burns out during the test, it may damage the entire tested valve and test device, resulting in large economic losses and even potential safety hazards.

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