Level Approximation Algorithm for RMVSC Based on Double Weighting Factors

Aiming at the problem of excessive ripple voltage of traditional low frequency cyclic triggering of RMVSC (Reinjection Multi-level VSC), combining with the voltage characteristics of the converter, based on the idea of MMC (Multi-level Modular Converter) bubble sorting voltage equalization, a new type of RMVSC level approximation algorithm with double weighting factors is constructed, and the model of RMVSC is constructed on the PSCAD/EMTDC simulation platform. The simulation results show that the introduction of double weighting factors can optimize the cascaded H-bridge ripple voltage, effectively alleviate the cascaded H-bridge capacitor voltage imbalance, and follow the principle of unnecessary unordered switching action, which significantly reduces the system switching loss. And the dynamic performance is good under STATCOM conditions, and the ideal waveform can be output without filter to realize the soft switching technology.