随机共振技术在电网接地故障检测中的应用

Application of Stochastic Resonance Technique in the Measurement of Power Network Grounding Fault

目前在电网接地故障检测过程中,所采集的零序电流都存在信号提取困难,信号小,有噪声,易受干扰等问题。分析了电网接地故障选线技术及其优缺点,阐述了随机共振原理及其在弱信号检测中的应用,提出了在电网接地故障检测中应用随机共振技术。结果分析表明该技术具有适用性强、可靠性高等特点。

There are many questions about the collected zero sequence current in the detection processing for power network grounding fault,including the presence of noise,difficulties to extract signal,too weak signal and the possibility to being disturbed. At the present work,the principles of stochastic resonance technique are simply reviewed,and their advantages and disadvantages of various methods of the fault line selection are compared and analyzed,and their applications in the weak signal measurement are explored. A new method of the fault detection in power network grounding is proposed. Results show that this method has good characteristics,such as amplifying the effective signal,strong applicability and higher reliability.