中性点不接地配电系统并联铁磁谐振状态频域解析方法

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Abstract In recent years, cables have been widely used instead of overhead lines in the distribution network, and the increase of the distributed capacitance to the ground makes the system far beyond the parametric resonance region. However, when the single-phase grounding fault, especially the intermittent arc grounding fault, disappears, the ferroresonance phenomenon caused by PT saturation occurs from time to time. Non-ground neutral medium voltage power distribution system is based on the parallel equivalent model, using the describing function method to calculate the resonant state of the line parameters, analyzes the relationship between electric current and magnetic flux and the laws between the nonlinear equations. The incremental method is used to find out the resonance state under the condition of the stability criterion of solution, non-ground neutral medium voltage power distribution system is constructed in parallel ferro-resonance state frequency domain analysis method, to analysis provides theory basis for ferromagnetic resonance frequency distribution of the distribution network. Simulation results show the effectiveness of this method.

Key words： distribution network ungrounded neutral system ferroresonance state analysis descriptive function method

Received: 08 March 2020

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	Articles by authors
	Han Guoqiang
	Liu Xianglong
	ZhaoYilong
	Zhang Zhihua
	Zou Bing

Cite this article:

Han Guoqiang,Liu Xianglong,ZhaoYilong等. Frequency domain analytical method for parallel ferroresonance state of distribution system with neutral point ungrounded[J]. Electrical Engineering, 2020, 21(10): 88-92.

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http://dqjs.cesmedia.cn/EN/Y2020/V21/I10/88

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