An extended energy function for voltage and transient stability analysis considering voltage dependent active loads

The main concern of this paper is the proposal of extended Lyapunov function (ELF) for power system model that does not have Lyapunov function in the usual sense. The proposed ELF is used in angle and voltage stability analysis purposes considering the system loads modeled as voltage dependent terms. The proposed energy function was applied on a 3-bus test system. The results show that the proposed function can be used to obtain good estimates of the critical clearing time.