Research on Overvoltage and Insulation Coordination of Cascaded Power Electronic Transformers

The research on overvoltage and insulation coordination of Cascaded Power Electronic Transformers is one of the key technologies in engineering implementation. It has an important guiding role in the design, selection, manufacture and test of converter station equipment. Based on the Actual distribution network project, this paper sorts out the input conditions of the research, comprehensively analyzes the reasons for the overvoltage in the microgrid, and under the condition of fully considering various faults, the maximum overvoltage level at the key position of the system is obtained by statistics, and the arrangement plan of the arrester is proposed, and 10kV power systems is determined. The parameters of the arrester used in the power system are carried out (pscad/RTDS) energy simulation calculation of the arrester at each point. the correctness of the model, the arrester model is verified in order to ensure. Considering the insulation margin of the equipment, the insulation level of the equipment was further calculated, and the safety, reliability and economy of the system operation were considered comprehensively, and the arrangement strategy of the arrester was analyzed to ensure the correctness of the parameter selection of the arrester. The presented research provides support and provides a reference for the insulation coordination of the project.