短路计算中并联电容以及充电功率的影响研究

Research on Influence of Shunt Capacitor and Charging Power in Short-circuit Calculation

从理论上分析了并联补偿电容和线路充电功率对短路电流计算结果的影响,选取某地区电网"夏大方式"的计算模型和数据进行了仿真分析。仿真结果表明,计及并联电容、充电功率的影响时,短路电流的计算结果均会偏小,验证了理论分析中所得的变化规律。分析并找出本地区计算结果偏差比较大的厂站及偏差原因。最后建议各个电力部门在进行电网规划、运行时要注意协调配合,避免进行短路电流计算时未考虑并联电容或充电功率导致计算值偏于乐观而导致实际运行中短路电流水平超标现象,提升了短路电流理论计算值与实际运行值的契合度。

This paper analyzes influence of shunt compensation capacitor and charging power of the line on calculation result of short-circuit current in theory and selects calculation model and data of maximum operational mode in summaer in some regional power grid for simulating analysis.Simulation results indicate that calculation result of short-circuit current may be relatively small when considering influence of shunt capacitor and charging power which verifies changing laws from theoretical analysis.It also analyzes and finds out power plants and stations with larger deviations of calculation results and reasons for deviations.Finally,it suggests electric power departments to pay attention to coordination and cooperation when carrying out power grid planning and operation so as to avoid short-circuit current exceed the standard in practical operation when making calculation on short-circuit current without considering shunt capacitor and charging power and promote integrating degree of theoretical calculation value and actual operational value.