Dynamic Stability Enhancement Using Self-Tuning Static Synchronous Compensator

The design of a self tuning Static Synchronous Compensator (STATCOM) based on pole placement method is presented. In order to maintain good damping characteristics when there is a drastic change in system operating condition, the gain settings are adapted in real time based on the continuously measured system inputs and outputs. The new self tuning proportional integral (PI) control can provide better damping characteristics than a fixed gain PI control STATCOM over a wide range of operating conditions. Digital simulation of a two machine system following a three phase fault under different loading conditions is performed to demonstrate the robustness and effectiveness of the developed controller. Simulation results are presented at the end of the paper.