MODELING AND DESIGN OF MAXIMUM POWER POINT TRACKING SYSTEM CONTROL ALGORITHM FOR PMSG BASED GRID CONNECTED WIND POWER GENERATING UNIT

Abstract: Over recent decades because of many drawbacks of conventional energy sources like higher fossil fuel prices, harmful environmental damage, shortage of sources and increasing pollution the need to use renewable sources of energy has grown over recent decade. Seeing the needs of future generations, in recent decades, nonconventional energy resources are the core center of research investigative work. Among all other non-conventional energy sources wind energy conversion system is come out to be the most cost effective and the preferred alternative for power generation. As the wind has arbitrary and unpredictable nature, it is important that few kind of control strategy has to be introduced to obtain maximum power from the generated power from PMSG. Therefore, to obtain maximum power as possible from wind during uneven wind speed or wind speed variation, tracking controller for maximum power point tracking is employed. This paper represents a system model for a grid connected 3KW PMSG wind turbine system along AC-DC-AC conversion stages. Major object is to extract the maximum energy from the wind which confirms a highest efficiency of proposed work. First, mathematical modeling of wind turbine and PMSG are illustrated in this thesis. Among numerous methods available, the most competent technique of maximum power point tracking is Perturbation and observation (P&O) that has its own qualities. Complete system modeling is carried out by MATLAB & Simulink. Proposed system simulation evaluation is performed to ensure operation of maximum power point tracking and effectively extract maximum power generated throughout the variation in wind speed. Wind speed variation, causes disturbance in system frequency and voltage that results in generation losses. So to decrease significant variation in the system frequency and voltage, a voltage & frequency controller is also used to operate with voltage source converter (VSC). The implementation of the given system is evaluated for various profile of wind speed. A grid connected permanent magnet synchronous generator based WESC is designed, modeled & simulated with MATLAB & SIMULINK.