Active current-limiting control to handle DC line fault of overhead DC grid

Zhou, Meng and Xiang, Wang and Zuo, Wenping and Lin, Weixing and Wen, Jinyu and Yang, Ruizhang and Ni, Binye and Lu, Xiaojun; (2019) Active current-limiting control to handle DC line fault of overhead DC grid. In: 2019 10th International Conference on Power Electronics and ECCE Asia. Institute of Electrical and Electronics Engineers Inc., KOR. ISBN 9788957083130

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    Abstract

    To handle with the DC line faults in a DC grid, this paper proposed an active current-limiting controller for hybrid MMC. With this active current-limiting control strategy, the requirement of interruption current of DCCB will be significantly decreased, and the investment of DC grid will be reduced obviously. Firstly, the control architecture of active current-limiting controller is disclosed. To avoid the overvoltage of submodule capacitors during DC fault, a dynamic limiter for the reference value of the DC current controller is proposed. To decrease the peak of fault current, the feedforward controller of DC voltage is put forward. The decoupling controllability of the AC/DC voltage of hybrid MMC is disclosed. The current-limiting mechanism of the active current-limiting controller is analysis. Then, the validity of the active current-limiting control strategy is verified by RTDS.