Transient Characteristics and Influence of Small Current Grounding Faults in Active Distribution Network
Qin Suya1, Xue Yongduan1, Liu Lizheng2, Guo Yuhao1, Xu Mingming3
1. New Energy College China University of Petroleum (East China) Qingdao 266580 China; 2. Nanning Power Supply Bureau of Guangxi Power Grid Co. Ltd. Nanning 530031 China; 3. Electric Power Research Institute of State Grid Henan Electric Power Company Zhengzhou 450052 China
Abstract With the popularization of "double high (high proportion of clean energy, high proportion of power electronic devices) power grid". The penetration rate, of inverter-type and rotating distributed power supplies (DG) into the distribution network, is getting higher. Its influence on the transient characteristics and transient detection of single-phase grounding faults need to be further clarified. In this paper, the grounding fault equivalent circuit of active distribution network is established. The variation law, of grounding fault transient characteristics under different DG types as well as different access locations and access numbers is studied. Its impact on the device performance and the principle of transient line selection and location method is analyzed. The results show that since the access of DG does not change the faulty zero-mode network, the existing line selection and location method using the transient zero-mode signal can still be applied in principle. The access of rotating DG will increase the main resonant frequency and amplitude of the fault transient current, and expands the distribution range of attenuation time. Correspondingly, the sampling frequency and current measurement range of the grounding fault detecting device should be moderately increased. Simulation and field fault data verify the correctness of the results.
Qin Suya,Xue Yongduan,Liu Lizheng等. Transient Characteristics and Influence of Small Current Grounding Faults in Active Distribution Network[J]. Transactions of China Electrotechnical Society, 2022, 37(3): 655-666.
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