Voltage Stability Analysis Considering Dynamic Characteristic of Induction Motor Loads

Short-term large-disturbance voltage instability is an increasing industry concern. A common scenario is a large disturbance such as a multi-phase fault near a load center that decelerates motor loads. Following fault clearing with transmission outages, motors draw very high current while simultaneously attempting to reaccelerate, and may stall if the power system is weak. Massive loss of load and possibly area instability and voltage collapse may follow. Here Short-term large-disturbance voltage stability is analyzed considering electromechanical transient model of induction motor. The correctness of conclusion is verified by time domain simulation results.