Stability Analysis and Active Damping Method of the Bipolar DC System with Constant Power Loads
You Xiaoyao1, Liu Heping1, Miao Yiru2, Liao Jianquan1, Huang Yuansheng1
1. State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing 400044 China; 2. College of Electrical and Information Engineering Hunan University Changsha 410012 China
Abstract：Because of the negative incremental impedance characteristic, the constant power loads (CPLs) will adversely affect the stability of the DC system and cause system voltage oscillation. Current stability studies are mainly focusing on unipolar DC systems, and lack of research on bipolar DC systems. In this paper, a bipolar DC system based on a half-bridge voltage balancer is introduced. At first, a stability criterion for the bipolar system is illustrated. After that, the system model is derived by state space average method, and system transfer function is obtained. On this basis, a parallel virtual resistance damping method is proposed and analyzed for improving the stability of the bipolar DC system connected with CPLs. Furthermore, the Lyapunov indirect method is adopted to investigate the impact of unbalanced load on the system stability. It turns out that stability of the bipolar DC system is determined by the total output power of the system. Finally, simulation and experimental results verify the proposed method.
游逍遥, 刘和平, 苗轶如, 廖建权, 黄远胜. 带恒功率负载的双极性直流系统稳定性分析及其有源阻尼方法[J]. 电工技术学报, 2022, 37(4): 918-930.
You Xiaoyao, Liu Heping, Miao Yiru, Liao Jianquan, Huang Yuansheng. Stability Analysis and Active Damping Method of the Bipolar DC System with Constant Power Loads. Transactions of China Electrotechnical Society, 2022, 37(4): 918-930.
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