Detection of Ferroresonance in Isolated Neutral System Based on Atomic Decomposition Method
Gong Qingwu1, Zhang Jing1,2, Lei Jiazhi1, Zhang Caisen3, Li Xun4
1. School of Electrical Engineering Wuhan University Wuhan 430072 China; 2. Hubei Electric Power Industry General Company Wuhan 430072 China; 3. State Grid Wuhan Power Supply Company Wuhan 430072 China; 4. Shenzhen Power Supply Co. Ltd Shenzhen 518010 China
Abstract：According to the characteristics of ferroresonance signal, Atomic Decomposition Method was introduced as the analysis method of power system ferroresonance to overcome deficiency of traditional methods. Atomic Decomposition Method has a strong ability to analyze non-stationary signals.The best matching atoms could accurately characterize the ferroresonancesignal,and also quickly detect the ferroresonance frequency and other parameters. Aiming at the ferroresonance excited by the single-phase instantaneous ground fault and according to the analysis of post fault three-phase voltage and the zero-sequence voltage, the zero-sequence voltage was divided into three groups by time. Based on the relationship between signal frequency and attenuation coefficient, a ferroresonance detection method was proposed to detect the ferroresonance fault and the type of the system. This method could also distinguish the system fault from single-phase permanent earth fault and single-phase instantaneous ground fault. The simulation results showed that the proposed method can accurately detect the ferroresonance fault of the system which verified the effectiveness of the method.
龚庆武, 张静, 雷加智, 张才森, 李勋. 基于原子分解法的中性点不接地系统铁磁谐振检测[J]. 电工技术学报, 2018, 33(5): 1114-1124.
Gong Qingwu, Zhang Jing, Lei Jiazhi, Zhang Caisen, Li Xun. Detection of Ferroresonance in Isolated Neutral System Based on Atomic Decomposition Method. Transactions of China Electrotechnical Society, 2018, 33(5): 1114-1124.
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2018, Vol. 33 
