考虑电动机负荷的静态电压稳定分析

Static voltage stability analysis considering motor loads

电力负荷是电力系统的重要组成部分,采用不同的负荷模型所得系统静态电压稳定结果也有所差异。针对负荷的动态特性,将电动机负荷模型直接运用于连续潮流计算,负荷功率因数随着负荷增长方式的变化而变化,从而更能反映负荷实际。该方法计算简单,易于实现。仿真算例和实际算例的计算分析验证了所提算法的有效性。结果表明,考虑电动机负荷时的电压稳定性好于恒定功率负荷,电动机比例下降有利于静态电压稳定性。

Power load is an important component of power system and the system static voltage stabilities calculated based on different load models will be different. According to the dynamic characteristics of load,the motor load model is directly applied in the continuous power flow calculation,which is simple and easy to implement,while reflects better the actual load due to the power factor varying with the change of load increase mode. The simulative and calculative results of case study show its effectiveness. Analysis verifies that,the voltage stability calculation considering motor load is better than that only considering constant power loads and the decrease of motor load proportion is favorable to the static voltage stability.