Stability enhancement of wind power integrated system using PID controlled SVC and Power System Stabilizer

When power systems are interconnected, consideration needs to be given to the ability of the system to produce energy without affecting grid stability and reliability. This work is aimed at solving the stability problem of multi-machine wind power integrated system with the help of power system stabilizers (PSS) and a static VAr compensator (SVC) which is externally controlled by a Proportional Integral Differential (PID) controller. The wind generator model considered is a doubly fed induction generator model. The PID controller parameters have been selected by using Ziegler-Nichols tuning rule method. The stability assessment is made for both single phase and three phase fault with PSS in the power network, then with SVC and then with the PID Controlled SVC. The simulation results prove that by using PSS and SVC with PID Controller, the time for damping the oscillations, magnitude of the oscillations, machine speed deviations and the voltage settling time can be significantly reduced. Thus the Stability of a wind power integrated system can be greatly enhanced.