基于纵联比较原理的广域继电保护算法研究

A Wide Area Relaying Protection Algorithm Based on Longitudinal Comparison Principle

提出了基于纵联比较原理的广域继电保护算法。该算法通过广域继电保护系统收集特定保护范围内各智能电子设备(IED)的故障方向信息,结合文中定义的IED动作系数AF和关联系数RF进行简单运算,即可确定出故障的位置。借鉴电力系统分析中的N?1原则,提出广域继电保护系统N个元件中的某一个元件失效时整个系统应仍能正确工作的N?1概念,分析了继电保护系统的N?1运行状况,提出了基于广域信息应对该运行状况的继电保护策略。算例分析表明:文中提出的广域继电保护算法原理简单、运算方便、判断结果准确,能较好地克服N?1运行状况带来的影响,可明显提高继电保护系统的性能。

A wide area relaying protection algorithm based on longitudinal comparison principle is proposed. Wide area relaying protection system collects fault direction information from protection intelligent electronic devices （IEDs） in specific protection zone, and estimates fault site based on protection Action Factor （AF） and Relationship Factor （RF） that are defined in this paper. The N-1 operation statuses in relaying protection system is defined by benefiting from the N-1 concept in power system analysis field. The relaying protection N-1 operation statuses are analyzed and the strategies to reduce influences caused by N-1 operation statuses based on wide area information are proposed. The results of case study show that the wide area relaying protection algorithm based on longitudinal comparison principle is simple and convenient for fault determination, the fault estimation results are exact and immune against N-1 operation statuses, which can improve the performance of relaying protection system markedly. direction; action factor; relationship factor