Study on operational tests equivalence and steady-state test method for self-turn-off valves

The equivalence of operational tests for self-turn-off valves was investigated, which contains the test method, the implementation of test method and the analysis of test equivalence. The test method includes identification of test object, valve stresses analysis and establishment of the mathematic models of the stresses, test requirements as well as analysis of test items and equivalent test method. In this paper the steady-state operational test method of voltage-sourced converter based high voltage direct current transmission (VSC-HVDC) valve which are modular multi-level converters (MMC) valves based on IGBT was taken as a example to explain the investigation as to the test method, the test circuit and the equivalence of test, etc. In addition, the accuracy of the equivalent test method is verified.