基于样本熵理论的输电线路单相自适应重合闸研究

摘要

为了改善现有自适应重合闸技术在电力系统应用中存在的缺陷与不足,本文利用ATP/EMTP对输电线路进行单相接地故障仿真,并对故障相电压信号进行经验模态分解(EMD).由于样本熵能够很好地衡量信号信息的丰富程度,故对分解后得到的固有模态函数(IMF)进行样本熵值计算,通过熵值的差异从而判断出故障的瞬时性与永久性,保证在瞬时性故障时能成功实现自适应重合闸.通过大量的线路单相接地故障仿真验证了该方法的有效性和实用性.%In order to ensure good quality of the power system, adaptive reclosing technology has been widely used. In order to overcome the limitations of existing methods,this article uses ATP / EMTP to simulate the single-phase ground fault on transmission line, then uses the empirical mode decomposition (EMD) to decompose the fault phase voltage signal. As the sample entropy can be a good measure of the richness of the information signal, we calculate sample entropy values of the intrinsic mode function (IMF) to determine whether it is transient or permanent fault. When it is transient faults, the line can implement the successful adaptive reclosing. A large number of line fault simulations show the effectiveness and practicality of the method.