基于电磁时间反转的电网故障定位方法

An efficient method based on the electromagnetic time reversal to locate faults in power networks

提出一种基于电磁时间反转(EMTR)理论的电网故障定位新方法。首先讨论了EMTR技术在重大故障诊断中的适用性,利用经典的频域传输线方程,推导出解析表达式并推断故障的位置。其次讨论了所提出方法的准确性与记录故障产生的电磁暂态所采用的观测点数量的关系。然后举例说明了所提方法在时域的扩展。以一个小型同轴电缆系统为例,对实际故障进行硬模拟,验证了所提方法的有效性。最后,介绍了所提出的基于EMTR数据的故障定位方法在电磁瞬变电磁仿真案例中的应用。

A new method based on the electromagnetic time-reversal(EMTR)theory for locating faults in power networks is Presented.Firstly,the applicability of the EMTR technique to locate faults is discussed.Using the classical transmission-line equations in the frequency domain,analytical expressions are derived to infer the location of the fault.The accuracy of the proposed method is then discussed in relation to the number of observation points adopted to record the fault-originated electromagnetic transients.Then,the extension of the proposed method to the time domain is illustrated.The experimental validation of the proposed method is presented by making reference to a reduced-scale coaxial cable system where real faults are hardware-emulated.Finally,the application of the proposed EMTR based fault-location method to Electromagnetic Transients Program-simulated cases is presented.