Improvement of power system voltage stability using battery energy storage systems

Recently, use of the electric vehicle (EV) has begun to spread rapidly. Fortuitously, there is a possibility that the EV can be connected to a smart house in order to control charging and discharging operations. In this case, the smart house must perform optimal load sharing control according to the state of charge of the storage battery and the battery capacity. In this paper, voltage control is accomplished by the use of energy storage systems which are controlled using an original voltage stability criterion. The voltage stability criterion is made possible using the (P, Q)-V limits of voltage stability for the IEEE 5-bus system model. The effectiveness of the proposed method is verified by simulation results in the Matlab environment.