Large Signal Stability Analysis for DC Microgrid Clusters
Liu Sucheng1,2, Li Xiang1,2, Qin Qiangdong1,2, Xia Mengyu1,2, Liu Xiaodong1,2
1. School of Electrical and Information Engineering Anhui University of Technology Maanshan 243000 China; 2. Key Lab of Power Electronics & Motion Control Anhui University of Technology Maanshan 243000 China
Abstract：DC microgrid (DCMG) clusters are in general formed by interconnecting multiple DCMGs to achieve zonal energy sharing and optimized utilization through flexible power flow control, and thus the advantages of DC-based distributed generation systems can be fully exploited. However, small-scale DCMGs are weak grids of low inertia and high impedance, and hence the weak-weak interconnection will reduce the damping of DCMG clusters, and even lead to severe consequences like oscillation and system collapse. In the meantime, the dynamic characteristics of higher-order, strong coupling, and nonlinearity bring great challenges to the stability analysis of DCMG clusters. To address this issue, a method for large signal stability analysis of DCMG clusters was proposed based on Brayton-Moser mixed potential theory. The large signal reduced-order model of the DCMG cluster was built, and the mixed potential function that facilitates large signal stability criterion was derived in detail, and the influence of the critical parameters on the stability region was analyzed. The correctness of the analysis is verified by real-time simulation results.
刘宿城, 李响, 秦强栋, 夏梦宇, 刘晓东. 直流微电网集群的大信号稳定性分析[J]. 电工技术学报, 2022, 37(12): 3132-3147.
Liu Sucheng, Li Xiang, Qin Qiangdong, Xia Mengyu, Liu Xiaodong. Large Signal Stability Analysis for DC Microgrid Clusters. Transactions of China Electrotechnical Society, 2022, 37(12): 3132-3147.
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