EFFECT OF LOAD MODELING ON STEADY-STATE VOLTAGE STABILITY

This paper discusses the importance of load modeling in power systems for voltage stability studies. The steady-state voltage stability anal ysis is carried out using the available continuation power flow. Diffe rent types of load models constant power; constant current; constant i mpedance; and composite load, which is a combination of the first thre e models, are considered. The composite load model is obtained using t he LOADSYN software, where the load dependency on voltage is considere d. The concept of load connectivity is defined and the confusion about the critical point with respect to PV curves is clarified. It is show n that for nonlinear loads, the critical point is not at the tip of th e PV curve.