Variable speed wind turbine pitch angle controller with rate limiter anti-windup

This paper suggests a PI controller with adding rate limiter anti-windup loop for pitch angle control system of variable speed wind turbine (VSWT). The rate limiter anti-windup loop prevents the overloading on the wind Energy conversion system (WECS) at a high and fast change in wind speed by improving the control system response. Also the paper analyzes the rate limiter anti-windup loop and suggests a tuning criterion based on conversion the control system to equivalent ramp input system during rate saturation period. The proposed technique is checked under different climatic conditions of wind speed using MATLAB/SIMULINK platform. The results are compared with conventional PI without rate limiter anti-windup loop.