Reliability Evaluation of DC Distribution Network Considering Islanding Source-Load Uncertainty
Ma Yu1, Wei Gang1, Li Yang2, Li Mu3, Deng Shenwei1
1. School of Electric Power Engineering Shanghai University of Electric Power Shanghai 200090 China; 2. Cixi Power Supply Company of State Grid Zhejiang Electric Power Ningbo 315300 China; 3. Jiaxing Power Supply Company of State Grid Zhejiang Electric Power Jiaxing 314000 China
Abstract Aiming at the DC distribution network with High-penetration DG, a reliability evaluation method of DC distribution network considering the uncertainty of island source-load is proposed. According to the operating status and redundancy of the equipment, Markov reliability models of the inverter, DC transformer and DC circuit breaker are established. Aiming at the uncertainty of DG and load, multi-scenario technology (including Latin hypercube sampling, Cholesky decomposition combined with Nataf transform, scenario reduction technology) is used to generate islanding source-load typical scenarios, and a calculation method of island formation probability considering the duration of island is proposed. The minimum path method is improved based on the DG power supply situation and the probability of island formation, and the improved minimum path method is used to calculate the reliability indices of the DC distribution network. The effectiveness of the proposed method is verified by calculation examples, and the reliability indices of load points and the system before and after DG access are compared.
Ma Yu,Wei Gang,Li Yang等. Reliability Evaluation of DC Distribution Network Considering Islanding Source-Load Uncertainty[J]. Transactions of China Electrotechnical Society, 2021, 36(22): 4726-4738.
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2021, Vol. 36 
