限制500kV电网短路电流的网架调整优化算法  

An Optimization Algorithm for Short-circuit Current Limitation of 500 kV Power Grid by Adjusting Power Grid Configuration

作　　者：张永康[1] 蔡泽祥[1] 李爱民[1] 徐敏[1] 

机构地区：[1]华南理工大学电力学院,广东省广州市510640

出　　处：《电力系统自动化》2009年第22期34-39,共6页Automation of Electric Power Systems

摘　　要：通过开断部分线路调整500kV网架结构以增加超标站点之间的电气距离,是限制500kV电网短路电流的有效措施。对于开断线路的选择既要考虑短路电流的限制效果,又要尽量保持500kV网架的完整性,如何从上千种断线组合中,选取一种开断最少线路以最大限度限制超标站点短路电流的断线组合极为困难。文中通过分析开断线路对阻抗矩阵各元素的影响,推导开断线路与超标站点自阻抗变化的灵敏度关系,并以该灵敏度为指标提出了一种限制500kV短路电流的网架调整优化算法。该算法通过求取超标站点自阻抗灵敏度加权和的最大值,可以快速寻找限制超标点短路电流的最优断线组合,避免了对所有断线组合逐一进行校核的繁琐过程。基于该算法提出的广东电网500kV调整方案证明了其有效性。Breaking parts of transmission lines can increase the electric distance among over standard substations and it is an effective measure of limiting short-circuit current of 500 kV power grid. As regards the choices of breaking transmission lines, the restrictive effect of short-circuit current should be considered as well as the integrality of 500 kV power grid. Moreover, it is extremely difficult to seek a combination of breaking transmission lines from thousands of combinations, which can limit short-circuit current to the maximum by breaking the least transmission lines. By analyzing the influences of breaking transmission lines on elements of the impedance matrix, the relationship between breaking several transmission lines and the sensitivity of self-impedance of over standard substation is derived. Based on the sensitivity, an optimization algorithm for short-circuit current limitation of 500 kV power grid by adjusting power grid configuration is proposed. Through calculating the maximum value of weighted sum of the sensitivity, the optimal combination of breaking transmission lines can be rapidly sought by the optimization algorithm. Accordingly, it will avoid the tedious process of checking all the combinations of breaking transmission lines one by one. The effectiveness of the proposed algorithm is verified by the adjustment scheme of 500 kV power grid in Guangdong Province.

关 键 词：短路电流限制 自阻抗灵敏度 优化算法 

分 类 号：TM713[电气工程—电力系统及自动化]