R. Chai, B. H. Zhang, Z. Hao, T. Zheng, S. Ma, D. Chen
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Control strategies of MMC-HVDC connected to passive networks
This paper introduces the structure and operational mechanism of Modular Multilevel Converter-High Voltage Direct Current (MMC-HVDC) and the mathematical model for the MMC-HVDC system in d-q synchronous reference frame is developed. When supplying power to passive networks, the MMC-HVDC controller at the passive network side, which contains a novel inner fast current loop and an outer voltage loop, is designed. The MMC-HVDC connected to passive network simulation model is set up in PSCAD/EMTDC. Simulation results, in the case of various operation conditions, verify that the designed control strategy is effective.