发电机定子接地故障双频有源消弧策略及故障类型辨识

doi:10.19595/j.cnki.1000-6753.tces.221177

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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.

Key words： Floating nuclear power plant dual-frequency voltage regulation stator ground fault active arc suppression fault type identification safety current

Received: 21 June 2022

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TM312

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	Wang Yikai
	Yin Xianggen
	Tan Liming
	Qiao Jian
	Yin Xin

Cite this article:

Wang Yikai,Yin Xianggen,Tan Liming等. Generator Stator Ground Fault Active Arc Suppression and Fault Type Identification Method Based on Dual-Frequency Voltage Regulation[J]. Transactions of China Electrotechnical Society, 2022, 37(19): 4835-4847.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.221177 OR https://dgjsxb.ces-transaction.com/EN/Y2022/V37/I19/4835

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