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An accurate method for overcurrent-distance relays coordination in the presence of transient states of fault currents

机译：故障电流瞬态存在时过电流距离继电器协调的一种精确方法

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Regarding to dynamic nature of power system, short-circuit current also includes transient currents in addition to steady current. Transient components of fault currents may disturb the coordination between overcurrent (OC) and distance (Dis) relays because of the dependence of the operating time of inverse time overcurrent (OC) relays to the value of the short-circuit current. In this paper, a method for OC-OC and OC-Dis relay coordination, considering transient states of short-circuit currents, is presented. The dynamic model of the inverse time OC relay is used. A new formulation based on the dynamic model is presented to incorporate the pickup current (fp) into the coordination algorithm, in addition to the time setting multiplier (TSM). To improve OC-OC and OC-Dis relay coordination, the selection of various curves types for OC relays is considered. Adapted particle swarm optimization (PSO) algorithm is used to obtain optimal results for the coordination of relays. The proposed OC-OC coordination and OC-Dis coordination methods are implemented on a radial and a meshed network, and the results are compared with the conventional method of coordination. (C) 2018 Elsevier B.V. All rights reserved.
机译：关于电力系统的动态特性，短路电流除稳定电流外还包括瞬态电流。故障电流的瞬态分量可能会干扰过电流（OC）和距离（Dis）继电器之间的协调，因为反时限过电流（OC）继电器的工作时间与短路电流的值有关。本文提出了一种考虑短路电流瞬态的OC-OC和OC-Dis继电器协调方法。使用反时限OC继电器的动态模型。提出了一种基于动态模型的新公式，除了时间设置乘数（TSM）之外，还将拾取电流（fp）纳入协调算法。为了提高OC-OC和OC-Dis继电器的协调性，考虑了OC继电器的各种曲线类型的选择。自适应粒子群优化（PSO）算法用于获得优化的继电器协调结果。所提出的OC-OC协调和OC-Dis协调方法是在径向和网状网络上实现的，并且将结果与常规协调方法进行了比较。 （C）2018 Elsevier B.V.保留所有权利。

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