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Abstract

Considering the structure of modular multilevel converter (MMC-HVDC) valve, the coupling path of electromagnetic interference is analyzed. In order to accurately predict the radio frequency interference (RFI) produced by MMC-HVDC converter, the 3D model of sub-module is established which is the basic unit of converters, and the RFI caused by sub-module is simulated. Furthermore, the electric fields in the valve hall are calculated by three models. Model I includes all components, such as shells, grading rings. Taking the influence of coupling path into account, two simplified models of MMC-HVDC converter RFI are proposed. Model II and model III are simplified which take less calculating time and computer memory. Comparing the calculation results of simplified models with that of detailed model, the error analysis of electric field has been carried out.

Keywords

MMC-HVDC coupling path RFI sub-module electric field

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Calculation of RFI from valve hall in MMC-HVDC converter station

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