1.College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China;2.State Grid Zhejiang Electric Power Co., Ltd., Hangzhou 310007, China;3.Wenzhou Power Supply Company, State Grid Zhejiang Electric Power Co., Ltd., Wenzhou 325000, China;4.Electric Power Research Institute of State Grid Zhejiang Electric Power Co., Ltd., Hangzhou 310014, China
Large-scale multi-infeed direct current systems (MIDCs) lead to the relatively weak voltage support capability in receiving AC systems, resulting in severe voltage stability issues. Although, it is critical to enhance the strength of the AC system, it may exacerbate the short-circuit current level. The structure of the receiving AC system affects both system strength and short-circuit current level. Since optimizing the grid structure of the MIDC can deal with the contradiction between system strength and short-circuit current level. This paper proposes a grid structure optimization method based on the sensitivity analysis of generalized short-circuit ratio (gSCR) and the branch addition method. Firstly, the relationship between the gSCR and the short-circuit current level are explored. Secondly, the impact of AC system structure adjustment on the two indicators is studied, and the comprehensive benefits of structure adjustment after coordination of the two indicators are analyzed. Finally, the receiving DC terminals are classified, and corresponding optimization methods for receiving AC system structures are given. Simulation results verify the validity and effectiveness of the proposed method.
|||WANG Jiaming, ZHANG Jing, YANG Jianhua, et al. Optimization Method of Receiving AC Grid Structure for Multi-infeed DC System Based on Generalized Short Circuit Ratio[J/OL]. Automation of Electric Power Systems, http://doi. org/10.7500/AEPS20191206002.|