基于BPA的短路电流计算模式研究

BPA程序应用于计算短路电流时采取不同的计算方法、计算模式,将导致结果存在较大差异,影响电网规划决策。结合国内现行的短路电流计算标准,分析了在不同计算方法中对节点运行电压的不同假定,以及不同计算模式下线路充电功率和负荷模型构建的区别,讨论了由此引起的短路阻抗、短路电流计算差异。以新英格兰10机39节点改进测试系统和四川电网2020年规划网架进行三相短路电流仿真研究,分析比较基于BPA的不同计算方法、计算模式下短路电流值,提出了理论分析结果,建议了适合四川电网规划的短路电流计算模式。

Research on calculation mode of short-circuit current based on BPA

BPA short-circuit current calculation software is widely used in China, however, with the same source data its calculation result differs under different calculation conditions or with different methods and thus affects power grid planning and decision-making. With consideration of current calculation standards for short-circuit current, different assumptions for node operating voltage in different calculation methods are analyzed, the diferences of line charging power and load model construction with different calculation modes are analyzed, and the resulting differences of short circuit impedance and current calculation are discussed. Using improved New England 39 bus system and Sichuan power grid planning architecture in 2020 as examples, short-circuit current calculation results under different calculation conditions and with different methods based on BPA are compared to verify the variation of the theoretical analysis. Finally, some suggestions for the choice of short-circuit current standards are made.