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首页> 外文期刊>Generation, Transmission & Distribution, IET >Accurate coordination method based on the dynamic model of overcurrent relay for industrial power networks taking contribution of induction motors into account
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Accurate coordination method based on the dynamic model of overcurrent relay for industrial power networks taking contribution of induction motors into account

机译：考虑感应电动机贡献的工业电网过电流继电器动态模型的精确协调方法

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摘要

Induction motors are widely used in the industry. These motors contribute to short-circuit currents (SCCs) by generating transient currents. The transient component in the SCC causes a change in the operating times of the overcurrent (OC) relays and miscoordination between the main and the backup relays. Therefore, the conventional relay coordination methods that use fixed SCCs for a specific fault location are not suitable for industrial power networks. In addition, the contribution of induction motors may cause a false trip in non-directional OC relays at healthy feeder. Here, a method based on the dynamic model of the OC relay is proposed to take the effect of transient component of SCC into account in relays coordination. A new set of constraints is added to the conventional coordination constraints in order to solve the false trip issue. In this case, an optimisation algorithm is needed to coordinate non-directional OC relays. The proposed method is implemented in a power network of cement factory and the results indicate the effectiveness of the proposed method. Here the genetic optimisation algorithm has been used and the simulation has been achieved using DIgSILENT and MATLAB software.
机译：感应电动机在工业中被广泛使用。这些电动机通过产生瞬态电流来促进短路电流（SCC）。 SCC中的瞬态分量会导致过电流（OC）继电器的工作时间发生变化，并且会导致主继电器和备用继电器之间的配合不正确。因此，将固定SCC用于特定故障位置的常规中继协调方法不适用于工业电网。另外，感应电动机的作用可能会导致健康馈线处的非定向OC继电器误跳闸。在此，提出一种基于OC继电器动态模型的方法，在继电器协调中考虑了SCC的瞬态分量的影响。新的约束集被添加到常规协调约束中，以解决错误的行程问题。在这种情况下，需要一种优化算法来协调非定向OC继电器。该方法在水泥厂电网中实现，结果表明了该方法的有效性。这里使用了遗传优化算法，并使用DIgSILENT和MATLAB软件实现了仿真。

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