PERFORMANCE ANALYSIS OF VSCF GENERATING SYSTEM

Abstract

Energy is an essential ingredient of socio-economic development and economic growth. Renewable energy sources like wind energy is indigenous and can help the dependency on fossil fuels. In the recent days, the increased emphasis is being given on the harnessing of renewable/non conventional energy sources. Wind energy conversion systems are employed to generate electrical power from mechanical power derived from the wind. Wind energy conversion systems may operate at fix speed or at variable speed. Operating the wind turbine at variable speed has some attractive advantages like reduced mechanical stress in the gear box, increased annual energy capture, the need for costly blade control mechanism is avoided, improved controllability. It also helps in controlling active and reactive powers in automatic generation and control. This dissertation work is oriented towards investigating the performance characteristics of variable speed constant frequency (VSCF) wind generation systems. In the presented work a permanent magnet synchronous generator (PMSG) variable speed constant frequency (VSCF) wind generation system has been simulated in MATLAB/Simulink software with an algorithm to track peak power points of wind turbine and a control scheme has been implemented to control active and reactive power injected into the grid. In the wind energy conversion system (WECS) a permanent magnet synchronous generator converts the mechanical energy into electrical energy. As the voltage and frequency of generator output vary along the wind speed change, a dc-dc boosting chopper is utilized to maintain constant do link voltage. The dc voltage at diode rectifier was regulated to follow the optimized voltage reference for maximum power point operation of turbine system. Line side PWM inverter supply currents into the utility line by regulating the dc link voltage at inverter inputs. Proposed scheme gives a low cost and high quality power conversion solution for variable speed WECS.