基于Bhattacharyya距离算法的线路纵联保护新判据

Novel Criterion Applicable to Transmission Line Pilot Protection Based on Bhattacharyya Distance Algorithm

根据不同类型故障下的输电线路两侧电流波形特点,从实用化角度考虑,结合Bhattacharyya距离算法,提出了基于Bhattacharyya距离算法的线路纵联保护新判据。通过仿真实验分析了该判据的动作特性和灵敏度等问题。仿真结果表明,利用Bhattacharyya系数进行线路两侧电流波形相似度比较的纵联保护,原理简单,可靠性和灵敏度高,能快速有效识别输电线路中出现的各类故障,并在区外故障引起某侧电流互感器饱和而导致波形缺失以及波形采样异常时能够可靠闭锁,具有很强的抗干扰性。

According to the characteristics of current waveforms on both sides of transmission line under different fault types,a novel criterion for transmission line pilot protection based on Bhattacharyya distance algorithm is proposed from practical point of view.The operation behaviors and sensitivity of the proposed criterion are analyzed with simulation tests.The results indicate that the pilot protection utilizing Bhattacharyya coefficient to compare the waveform similarity of the currents on both sides is simple,reliable and more sensitive.It can identify various faults occurring in transmission line rapidly and effectively.In addition,it can reliably block the pilot protection in the cases of external faults accompanied with CT saturation and current sequences due to abnormal sampling,reflecting its excellent performance against abnormal data.