利用正弦拟合法的铁磁谐振与单相接地辨识

发布时间：2018-01-16 18:31

本文关键词：利用正弦拟合法的铁磁谐振与单相接地辨识　出处：《重庆大学学报》2014年08期 　论文类型：期刊论文

【摘要】：中性点不接地配电网中,电压互感器(PT)引起的铁磁谐振时常发生,导致系统零序电压升高,其现象与单相接地故障相似,容易造成接地选线装置误动。为此提出一种铁磁谐振与单相接地辨识的新方法,该方法以频率50Hz的正弦函数为模型对零序电压采样数据进行拟合,通过正弦函数的幅值判断零序电压是否为基频量。在零序电压为基频量的情况下,根据基频谐振时系统零序电压波形畸变的特点,计算波形畸变度以区分基频谐振与单相接地。仿真数据表明该方法能够有效辨识铁磁谐振与单相接地。
[Abstract]:In neutral ungrounded distribution network, the ferroresonance caused by voltage transformer (PTT) often occurs, which leads to the rise of zero-sequence voltage of the system, which is similar to the single-phase grounding fault. This paper presents a new method for identifying ferromagnetic resonance and single-phase grounding, which uses the sine function of 50 Hz frequency as the model to fit the sampling data of zero-sequence voltage. The amplitude of the sinusoidal function is used to determine whether the zero-sequence voltage is the fundamental frequency. When the zero-sequence voltage is the fundamental frequency, the characteristics of the zero-sequence voltage waveform distortion in the fundamental resonance are considered. The waveform distortion is calculated to distinguish the fundamental resonance from the single-phase grounding. The simulation results show that the proposed method can effectively identify ferromagnetic resonance from single-phase grounding.
【作者单位】：重庆大学输配电装备及系统安全与新技术国家重点实验室;唐山供电公司;唐山三友集团;
【基金】：国家重点实验室访问学者基金资助项目(2007DA10512709403)
【分类号】：TM862
【正文快照】： 2.唐山供电公司,河北唐山063000;3.唐山三友集团,河北唐山063305)在中性点不接地配电网中,单相接地是最常见的故障。系统发生单相接地故障时,须尽快选出故障线路并予以切除,以避免发展为两相接地短路[1]。然而,系统发生铁磁谐振时,其现象与单相接地类似,电压互感器的开口三角

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