Inverse-system control approach for variable-speed variable-pitch wind generator

This paper presents an inverse-system control approach for Variable-Speed Variable-Pitch Wind Generator systems (VSVP-WGS) in order to optimize the wind energy conversion in a high wind speed region. The controller synthesizes the ideas of two-lime-scale approach and inverse-system) method. Based on two-time-scale analysis, the model of VSVP-WGS call be reduced to a first-order one with non-affine and nonlinear characteristics. With inverse-system method, the nonlinear model is converted into a pseudo-linear one and then can be stabilized simply by linear system approach. The performance of the inverse-system controller (ISC), which is confirmed through theory analyses and simulalions, show that, compared with a proportional-integral Controller (PIC), it makes VSVP-WGS provide a wider operating region and generate smoother output pm er. Compared with other nonlinear Controllers. ISC is simpler and can be more easily transplanted to other kinds of WGS.