Improving Transient Stability of Diesel-Wind-Solar Hybrid Power System by using PSS

Power system stabilizer (PSS) has been used for decades for its high effectiveness to provide positive damping torque to synchronous generators through the excitation system. Its implementation aims to improve the stability of the synchronous generators in response to severe disturbance. However, with recent power grid expansion through integration of inertial-less renewable energy, the effectiveness of PSS in improving transient stability of inertia-reduced hybrid power system is concerned. Therefore, this study aims to verify the effectiveness of PSS in the hybrid diesel-wind-solar PV power system. Subsequent to this, the impact of PSS1A and PSS4B on the transient stability of the hybrid system are compared by simulating different faults events. From the results obtained, the implementations of both PSS1A and PSS4B can still maintain the steady-state stability of the hybrid power system with improvement made on transient stability, particularly in stabilizing rotor angle and post-fault power recovery. The comparison between the two PSSs shows that PSS4B outperformed PSS1A in damping the system oscillation.