适用于拓扑调整的短路电流快速计算方法

A method of fast short-circuit current calculation for topology adjustment

传统的适用于电网运行方式调整的短路电流计算方法耗时太长,无法满足电网快速分析决策的需求。在此背景下,提出了适用于电网拓扑调整的短路电流快速计算方法。该算法基于节点阻抗矩阵,采用补偿法分析发电机停运、线路开断和线路出串运行导致的阻抗矩阵变化,并在此基础上给出了适用于电网拓扑调整的短路电流快速计算流程。针对不同节点规模的实际系统的仿真算例表明,所提出的方法计算速度快,计算结果准确可靠,能够满足大电网方式调整优化对短路电流计算的要求。该方法可以为电网短路电流限制策略分析提供技术支撑。

The traditional method of the short-circuit current calculation, which is used for the operation mode arrangement, costs too much time. It cannot meet the demand of fast analysis and decision-making. Therefore, a fast algorithm of short-circuit current calculation that is applicable to the grid topology adjustment is put forward. Based on the node impedance matrix and compensation method, it can analyze the changes of impedance matrix caused by the generator outage, line outage and line out series, and based on which the calculation procedure is given. The performance of the proposed method is demonstrated by tests on several real power systems. The simulation results show that the proposed method is fast and accurate, and it can meet the demand of the operation mode arrangement of large-scale power systems. Furthermore, this method is able to provide the technical support for the measure analysis of the short-circuit current limitation.