Generator Stator Ground Fault Active Arc Suppression and Fault Type Identification Method Based on Dual-Frequency Voltage Regulation
Wang Yikai1,2, Yin Xianggen1,2, Tan Liming1,2, Qiao Jian1,2, Yin Xin1,2
1. State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China; 2. Hubei Electric Power Security and High Efficiency Key Laboratory Huazhong University of Science and Technology Wuhan 430074 China; 3. School of Electrical and Information Engineering Changsha University of Science & Technology Changsha 410114 China
Abstract：The operation environment of floating nuclear power plant is harsh, and the generator stator ground fault occurs frequently. When the fault risk is serious, the stator iron core will be damaged, but blind cutting will lead to power loss of important loads, threatening the safe operation of the plant. This paper presents the method of stator ground fault arc elimination and fault type identification based on dual-frequency voltage regulation. Firstly, based on the arc elimination principle of voltage compensation, a voltage source containing fundamental and third harmonic components is applied to the generator neutral point. Its output voltage is controlled as the same amplitude and opposite phase with the fault electric potential, then the voltage at the fault point is suppressed to zero to achieve effective arc extinguishing. Ground fault type identification is realized combining with ground fault safety risk analysis. Under high risk conditions, at the same time of adjusting the fundamental injection voltage, the ground fault current is controlled within the safety current range. The instantaneity and permanent ground faults are identified based on the criterion of phase difference between the fundamental zero-sequence current and the neutral point voltage. Simulation and dynamic test results verify the effectiveness of the proposed method.
王义凯, 尹项根, 谭力铭, 乔健, 尹昕. 发电机定子接地故障双频有源消弧策略及故障类型辨识[J]. 电工技术学报, 2022, 37(19): 4835-4847.
Wang Yikai, Yin Xianggen, Tan Liming, Qiao Jian, Yin Xin. Generator Stator Ground Fault Active Arc Suppression and Fault Type Identification Method Based on Dual-Frequency Voltage Regulation. Transactions of China Electrotechnical Society, 2022, 37(19): 4835-4847.
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