基于原子分解法的中性点不接地系统铁磁谐振检测

doi:10.19595/j.cnki.1000-6753.tces.170078

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摘要根据铁磁谐振信号特点,引入原子分解法作为电力系统铁磁谐振信号分析工具,以克服传统信号分析方法的缺点。原子分解法对非平稳信号具有较强的分析能力,得到的最佳匹配原子能够准确表征铁磁谐振信号,快速检测出铁磁谐振频率等参数。针对中性点不接地系统由单相瞬时接地故障激发的铁磁谐振,综合故障后的三相电压和零序电压,并将零序电压按时间分为三组,用原子分解法对每组信号进行分析,根据信号频率及衰减系数参数间关系,提出铁磁谐振检测方法,检测出系统的铁磁谐振故障及类型,并与单相永久接地故障和单相瞬时接地故障区分开。仿真分析结果表明,该方法能够准确检测出系统的铁磁谐振故障,证明了此方法的有效性。

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	龚庆武
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	雷加智
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	李勋

关键词 ：原子分解, 铁磁谐振, 检测, 中性点不接地系统

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.

Key words： Atomic decomposition ferroresonance detect isolated neutral system

收稿日期: 2017-01-17 出版日期: 2018-03-14

PACS:

TM71

通讯作者: 龚庆武男,1967年生,教授,博士生导师,研究方向为电力系统运行与控制。E-mail：1163012740@qq.com

作者简介: 张静女,1990年生,硕士研究生,工程师,研究方向为电力系统运行与控制。E-mail：535663221@qq.com

引用本文:

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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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.170078 https://dgjsxb.ces-transaction.com/CN/Y2018/V33/I5/1114

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