Key stress extraction and equivalent test method for hybrid DC circuit breaker

摘要

Firstly,relevant stress properties of millisecond level breaking process and microsecond level commutation process of hybrid HVDC circuit breaker are studied in detail on the basis of the analysis for the application environment and topological structure and operating principles of hybrid circuit breakers,and key stress parameters in transient state process of two time dimensions are extracted.The established digital simulation circuit for PSCAD/EMTDC device-level operation of the circuit breaker has verified the stress properties of millisecond level breaking process and microsecond level commutation process.Then,equivalent test method,circuits and parameters based on LC power supply are proposed on the basis of stress extraction.Finally,the results of implemented breaking tests for complete 200kV circuit breaker,100kV and 50kV circuit breaker units,as well as single power electronic module have verified the accuracy of the simulation circuit and mathematical analysis.The result of this paper can be a guide to electrical structure and test system design of hybrid HVDC circuit breaker.