Research on an adaptive droop control strategy applied in voltage source converter based multi-terminal high voltage direct current transmission system
BAI Guoyan1, LI Chunbao2, MENG Fancheng2, LI Mushu2, MA Wenzhong2
1. China Railway 16th Bureau Group Electrification Engineering Co., Ltd, Beijing 100018; 2. China University of Petroleum (East China), Qingdao, Shandong 266580
Abstract:The stability of DC voltage has become the key issue of voltage source converter based multi-terminal high voltage direct current transmission (VSC-MTDC) system. In order to overcome the drawbacks of conventional droop strategy in term of complexity of parameters tuning, low control accuracy and lack of flexibility in various circumstances, an improved adaptive droop strategy is proposed in this paper. The droop parameters are designed based on the optimal analysis of load flow and power sharing of the VSC-MTDC system and adjusted adaptively by the control law which is related to local electrical quantities. A four-terminal VSC-MTDC simulation model is built in PSCAD/EMTDC and the results of simulations prove that the proposed droop strategy can promote the performance of the VSC converter under different operating conditions and enhance the flexibility and reliability of the system.
白国岩, 李春宝, 孟繁丞, 李沐书, 马文忠. 多端柔性直流输电系统的自适应下垂控制策略研究[J]. 电气技术, 2022, 23(5): 1-8.
BAI Guoyan, LI Chunbao, MENG Fancheng, LI Mushu, MA Wenzhong. Research on an adaptive droop control strategy applied in voltage source converter based multi-terminal high voltage direct current transmission system. Electrical Engineering, 2022, 23(5): 1-8.