Research on the pre-charging control strategies of the series part of MMC-UPQC

In order to effectively control the inrush current in the pre-charging process of the series parting in the Unified Power Quality Controller based on the Modular Multilevel Converter, the pre-charging process of the MMC-UPQC is analysed in this article, and the series part of the pre-charging mechanism is studied deeply; Then it studied how to control the inrush current of pre-charging process with reactance parameters and control strategies to control; And at the last, with the tool of the PSCAD/EMTDC, the 15-level MMC-UPQC model was built and the simulation results showed that only the combination of reasonable reactance value together with the suitable control strategy can effectively suppress the impact of the process.