Optimal Enhancement of Voltage Stability in Microgrids

This paper aims to address the voltage stability studies from different points of view. The voltage stability can be analyzed by many methodologies which may fundamentally be classified as dynamic analysis and static analysis. From the dynamic analysis point of view, the voltage of a conventional and a renewable generators is regulated using a PID controller. The TLBO optimization technique is used to tune the controller gains to minimize the generator's output voltage error and to improve the dynamic performance. From the static analysis point of view, the voltage of a 69-bus radial distribution system is regulated by allocating DGs at the system's busses. The same optimization technique, which is TLBO, is used to select the optimal size and location of the DG at the system under study.