Modeling, control design and simulation of a grid connection control mode for a small variable-speed wind turbine system

In this paper, a variable-speed wind turbine generator system with a vector controlled back-to-back PWM-VSI on the stator side has been modeled, designed and simulated to study its steady state and dynamic behavior. The grid connection control mode of a wind turbine based on a flexible dSPACE digital signal processor system that allows user-friendly code development, monitoring and online tuning is used. The design of an LCL-filter, current controller and DC-link voltage controller are described in detail. The PI-controllers are designed using pole-zero placement technique and the gain of the regulators are found using root locus method. The experimental results demonstrate the performance of the design procedure. A good agreement between simulation and experimental results was obtained.