An Efficient Variable Speed Stand Alone Wind Energy Conversion System & Efficient Control Techniques for Variable Wind Applications

This paper provides an efficient control technique for the operation of a direct-drive synchronous generatorbased stand-alone variable-speed wind energy conversion system. The control strategy for the generator-side converter with maximum power extraction is presented. This control provides a constant output voltage and frequency which capable of delivering to variable loads. The main attention is DC link voltage control deals with the chopper control for various load conditions, also a battery storage system with converter and inverter has to be used to deliver continuous power at the time of fluctuated wind. The PI Controller in switch mode rectifier can be replaced with vector control technique to improve the output voltage level. The simulation results show this control strategy gives better regulating voltage and frequency under sudden varying loads. Dynamic representation of DC bus and small signal analysis of the system are presented. The dynamic controller shows very good performance.