Performance verification of the inverse-system controller for the variable-speed variable-pitch wind generation system

This paper presents the performance verification results of the inverse-system controller (ISC) which was proposed by us recently for the pitch control of a variable-speed variable-pitch wind generation system (VSVP-WGS). Based on multi-time-scale analysis, the motion of pitch is reduced to a first-order model with non-affine and nonlinear characteristics. Using the inverse-system method, the nonlinear model is further converted to a pseudo-linear one and then can be synthesized simply by linear system approach. A hardware-in-the-loop experimental platform of VSVP-WGS is established for the pitch control study. The wind turbine is emulated by an induction motor with torque control mode. The models of wind speed and pitch regulator are implemented in MATLAB/SIMULINK real-time environment. Experimental results show that, compared with conventional proportional-integral (PI) controller, ISC is simpler to be designed, easier to be stabilized. Also, it can smooth the output power of the VSVP-WGS and reduce the mechanical fatigue of the pitch regulator.