Valve Power Loss Fast Evaluation Method for Modular Multi-level Converter Operating at High-Frequency

The standard IEC 62751 proposed a valve power loss evaluation method combing analytical formulae and numerical simulation for modular multilevel converter (MMC). However, the illustration of building a MMC model and processing simulation results have not been addressed. And also, obtaining solutions from a diodes and IGBTs based simulation model can cost excessively long time. A fast power loss evaluation method is proposed in this paper by linking the PSCAD/EMTDC and Matlab files. Detailed valve power loss analysis of a 201-level 500MW MMC operating at 50Hz~1000Hz is then presented. Relationship between the valve power loss, power transfer level and operating frequencies are presented and fitted. Research results of this paper can be used as guidance for the application of medium and high frequency MMC.