Coordinated tuning of POD and PSS controllers with STATCOM in increasing the oscillation stability of single and multi-machine power system

Static synchronous compensator (STATCOM) is a shunt connected voltage source converter (VSC), which can affect rapid control of reactive flow in the transmission line by controlling the generated a.c. voltage. The main aim of the paper is to design a power system installed with a Static synchronous compensator (STATCOM) and demonstrates the application of the model in analyzing the damping effect of the STATCOM to improve power system oscillation stability. The proposed controllers are designed to coordinate two control inputs: Voltage of the injection bus and capacitor voltage of the STATCOM, to improve the transient stability of a SMIB system and multimachine system. The STATCOM controller namely conventional PI controller. The power oscillations damping (POD) control and power system stabilizer (PSS) and their coordinated action with proposed controllers are tested. The simulation results show that the proposed controller provides satisfactory performance in terms of improvements of transient stability of the system. The results indicate that the coordinated POD & PSS action further improves the dynamic performance of the system under various system conditions.