We propose to investigate various control methods by which the power factor of an induction generator can be regulated to achieve enhanced power conversion efficiency. In particular, this study will focus on variable generator terminal voltage control to accomplish these goals. Various control strategies will be developed to identify the most cost-effective and reliable methods for testing and commercialization. Estimates of increases in generator efficiency, power output, and energy capture, along with any additional operational benefits, will be determined by using the control schemes developed. The final product of this research project will yield a means by which wind turbine generators can be maintained at near constant efficiency throughout their entire operating spectrum.Anticipated Results/Potential Commercial Applications as described by the awardee:The improvements realized in the low-load efficiency of induction generators and motors by reduced excitation voltage is well documented. Optimum control of the terminal voltages of wind turbines equipped with induction generators operating at low load can result in substantial improvements in overall system energy capture. Other operational benefits may also be realized by reduced voltage operation. Commercial applications include controller sales to all types of small power pro ducers for new equipment installations and for retrofit of existing facilities.
