Modelling of Power System Stabilizer for Double Fed Induction Generator based Wind Power System

This paper presents the Power System Stabilizer (PSS) for the variable speed wind turbine generator of the Doubly Fed Induction Generator (DFIG). The mathematical model fur DFIG is developed in the synchronous reference by using stator voltage orientation vector control for current and voltage controller and is discretized in time domain. The current controller has two components namely d and q-axis. The d-axis component controls the active power and q-axis component controls the reactive power. The voltage controller converts the dq into ABC-reference frame for rotor and grid side converter. In the proposed control scheme, PSS is designed to improve the performance and efficiency of the system. The proposed two PSSs are (a) Active power stabilizer (b) Reactive power stabilizer. The control strategy with stabilizing parameter of PSS not only improves the dynamic performance but also maintains almost unity power factor to the grid. The effectiveness of the proposed method is verified by developing the simulation model of 1.5 MW, 575 V, and 50 Hz DFIG based wind turbine in MATLAB/SIMULINK-2013b. In order to explore the robustness of the without and with PSS, simulations are carried out for rapid variation of wind speed and three-phase fault generated in the system. The simulation results show that the proposed PSS have better power control, faster oscillation damping, more accurate regulation, considerably reduced settling time and has fewer ripples in comparison without PSS.