Modelling and control in Wind Energy Conversion Systems (WECS)

This paper encompasses the study of modelling and design of WECS, using a wind turbine with known dynamic characteristics and a permanent magnet synchronous generator driven by a back to back power converter topology. The dynamic modeling allows to know the response of the turbine generator system in the whole range of operation. In this study, it is proposed a variable structure control scheme with two different kind of operation, namely maximum power point tracking (MPPT) and constant power (CP). In the CP region, it is demonstrated that the system is controllable with the speed control loop while that using torque control an unstable control loop results.