负荷静态特性对PV曲线的影响

Influence of Load Static Characteristic on PV Curve

以单负荷无穷大系统为研究对象,负荷采用幂指数静态负荷模型,通过数学理论分析了负荷静态特性对PV曲线的影响,并分析了不同负荷模型的λV曲线和PV曲线的变化趋势及对系统电压稳定性进行了比较。分析结果表明:只有在恒功率负荷的模型下λV曲线的鼻端对应于PV曲线的鼻端,非恒功率负荷的模型下λV曲线的鼻端对应于PV曲线的下半支,和恒功率负荷最易失去稳定性,而恒阻抗负荷不存在不稳定的问题。最后通过仿真验证了理论分析的结果。

Taking the single load infinite bus system as the investigated subject, the exponential static load model is used. The influence of load static characteristics on PV curves is analyzed according to mathematical theory. The change trend of A V curves and PV curves of different load models is analyzed, and the voltage stability of the system is compared. The analysis re- suits show that the nose of A V curves corresponds to the nose of PV curves only in constant power load model, the nose of A V curves corresponds to the second half of PV curves in non - constant power load model, and the constant power load loses the stability easily, while the constant impedance load does not exist the problem of instability. The simulation results verify the theoretical analysis at last.