Modeling and Simulation of Grid Connected Synchronous Generator with Controller

The increasing demand of electric power necessitates the establishment of new generating stations. Wind energy conversion system (WECS) is more attractive due to its mature and clean aspects. During last decades the variable speed wind turbine concept has been increasingly receiving attention due to the fact that it is more controllable and efficient, and has good power quality. The wind turbine driven with permanent magnet synchronous generator (PMSG) feeds ac power to utility grid. For this purpose two voltage source converters are connected back to back between rotor terminals and grid via common dc link. In order to satisfy the grid code requirements such as grid stability, power quality improvement, and power control this machine is usually used. In this paper the complete mathematical modeling and simulation of wind turbine driven PMSG has been done. The stator and rotor of PMSG is connected to the grid through back to back connected two voltage source converters with a common DC link. The total system is modeled and simulated for better power quality and is capable of harnessing maximum power at various wind speeds. A new control strategy known as perturb and observation (P&O) controller is introduced in WECS for maximum power point tracking (MPPT) to improve the system operation. The simulation is done in MATLAB Simulink environment. Keywords— Back to back pwm converters, Grid, PMSG, WECS, Wind turbine.