基于衰减振荡信号特征参数和伪阻抗的电路参数计算方法

发布时间：2018-01-09 14:31

本文关键词：基于衰减振荡信号特征参数和伪阻抗的电路参数计算方法　出处：《物理学报》2014年09期 　论文类型：期刊论文

【摘要】：本文研究了基于暂态信号中衰减振荡信号的电路参数计算理论和方法.在电力系统线路发生故障时,通过计算暂态信号流通路径电路参数可确定故障位置、推断故障原因,而衰减振荡信号作为暂态信号主要成分,因此分析基于衰减振荡信号的电路参数计算在电力系统故障定位中有重要理论价值和实际工程意义.结合R-L电路和R-C电路,首先推导了时域衰减振荡电压、电流信号特征参数与各元件参数以及电路参数间定量关系;并分析了电路在衰减振荡信号下阻抗特性,结合稳态正弦分量阻抗概念,将电路流经衰减振荡信号时的阻抗特性定义为伪阻抗,并确定了伪阻抗与电路参数和信号特征参数间的关系;同时分析了串并联条件下伪阻抗与元件参数关系.以此为基础分别提出了基于信号特征参数和基于伪阻抗的电路参数计算理论,结合现有衰减振荡信号特征提取方法,提出具体计算方法,为基于衰减振荡信号的电路参数计算理论发展以及实际工程应用奠定了重要基础.通过MATLAB模拟产生故障信号对所提理论和方法进行验证,结果证明了所提理论和方法的正确性和准确性,并以实际电网故障信息为基础,基于PSCAD/EMTDC建立实际配网模型并对实际单相接地故障进行重现,对配网单相接地故障进行定位分析,结果证明了方法的可行性.
[Abstract]:In this paper, the theory and method of circuit parameter calculation based on attenuated oscillation signal in transient signal are studied. In the case of power system line failure, the fault location can be determined by calculating the circuit parameters of transient signal flow path. The reason of the fault is inferred, and the attenuation oscillation signal is the main component of the transient signal. Therefore, it has important theoretical value and practical engineering significance to analyze the calculation of circuit parameters based on attenuated oscillation signal in power system fault location, combining R-L circuit and R-C circuit. Firstly, the quantitative relationship between the characteristic parameters of the time-domain attenuation oscillation voltage, current signal and the parameters of each component and the circuit parameters is deduced. The impedance characteristic of the circuit under the attenuated oscillation signal is analyzed, and the impedance characteristic of the circuit flowing through the attenuated oscillation signal is defined as pseudo impedance in combination with the concept of steady state sinusoidal component impedance. The relationship between pseudo-impedance and circuit parameters and signal characteristic parameters is determined. At the same time, the relationship between pseudo-impedance and component parameters under series-parallel condition is analyzed. Based on this, the calculation theory of circuit parameters based on signal characteristic parameters and pseudo-impedance is proposed respectively. Combined with the existing attenuation oscillation signal feature extraction method, a specific calculation method is proposed. It lays an important foundation for the development of circuit parameter calculation theory based on attenuated oscillation signal and practical engineering application. The proposed theory and method are verified by generating fault signal by MATLAB simulation. The results show that the proposed theory and method are correct and accurate, and based on the actual fault information. The actual distribution network model is established based on PSCAD/EMTDC, and the actual single-phase grounding fault is reproduced, and the location of single-phase grounding fault in distribution network is analyzed. The results show that the method is feasible.
【作者单位】：四川大学电气信息学院;国家电网乐山电力股份有限公司;国家电网宜宾供电公司;国家电网绵阳供电公司;国家电网资阳供电公司;
【分类号】：TM711.2
【正文快照】： 1引言在电力系统中,当线路发生接地故障时,系统将与大地构成新的流通回路,该流通回路电路参数直接反应了故障距离和故障电阻等信息,利用变电站端电压、电流信号测量信号计算回路参数即可确定故障位置并推断故障原因,该思路已在继电保护和故障定位中得到了大量应用[1-5].传统方

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