短路电流计算外网等值方法研究及应用

Research and Application of External Network Equivalent Method in Short Circuit Current Calculation

随着电网规模的不断扩大,短路电流计算耗时逐渐增加,并且对计算软件的要求也不断提高,为提高短路电流计算效率,研究了一种适用于地区短路电流计算的外网数据等值方法,首先对全网的节点导纳矩阵进行等值化简,形成边界区域的新增注入元素,然后构造出仅包含研究区域和边界区域的简化电网模型,用于研究区域内的短路电流计算,并从理论上分析了该等值方法的效果与优势。在IEEE 39节点系统上对所提方法进行了验证,证明了所提方法的正确性和有效性,最后以华北电网为实例进行了外网等值简化,形成某一地区的短路计算用电网数据,大大降低了电网规模,能有效提高该地区短路电流计算的效率。

The time consuming of short circuit current calculation increases with the development of the power grid scale, and therequirement for computation software is enhanced. An external equivalent method is introduced for calculation of the short circuitcurrent in order to improve the calculation efficiency. Firstly, the node admittance matrix of the whole power network is equivalentlysimplified to form the additional elements of the boundary region. And then a simplified power network composed of the studyregion and boundary region is constructed to calculate the short circuit current in the study region. The validity and efficiency of thisproposed algorithm is theoretically analyzed and verified on the IEEE 39-node power system. Finally, the North China power grid isused as an example for external equivalent simplification to form the short circuit calculation data of a certain area, which greatlyreduces the scale of the power system and improves the calculation efficiency of short circuit current.This work is supported by National Key Research and Development Program of China （Research on the Key Technique of AC/DCInterconnected Power Transmission System Used on the Large-Scale Renewable Energy Generation and Energy Storage, No.2016YFB0900501） and Research and Development Program of State Grid Jibei Electric Power Company Limited （Research on the Power GridPlanning Technology Adapt to the Large-Scale and Various Power Generation, No.52018F160002）.