Voltage stability improvement by optimal active power and reactive power output control of storage battery system

Future, transmission capacity processing capability may become the limit because of the pursuit of economic benefit and increasing renewable energy. Then, the power system is placed in severe conditions than ever. In addition, it increases the likelihood of voltage instability and voltage collapse. Therefore, voltage stability analysis is a major concern in power system operation. Voltage stability has been analyzed in a variety of ways. However, voltage stability analysis considering simultaneously both the active and reactive power in the analysis is less done because of it is difficult analysis. When considering both the active and reactive power at the same time, it is expected that voltage stability analysis is accurate. In this paper, we propose a method to improve the voltage stability of the power system by using the voltage stability index of the active power information and reactive power information of the transmission line. Installing the battery in the load substation to inject the appropriate amount of active and reactive power can improve the voltage stability of the system as shown in the simulation. In addition, it indicates further improvement of voltage stability by optimal active power and reactive power output with battery.