Implementation of Novel Maximum-Power- Extraction Algorithm for PMSG Wind Generation System without Mechanical Sensors

This study focuses on the implementation of a novel maximum-power-extraction algorithm (MPEA) including a maximum-power error driven (MPED) mechanism and a maximum-power differential speed (MPDS) control for a wind generation system with a permanent-magnet synchronous generator (PMSG). In the proposed MPEA scheme, the MPED mechanism operating like a traditional hill-climbing method drives the output power gradually increasing to its maximum value by regulating the direction of voltage command according to the power variation trend. Moreover, the MPDS control produces an additional step of voltage command based on the instantaneous difference of generator speeds so that it can prevent the wind turbine from stalling at the suddenly dropping wind speed and achieve the object of maximum power extraction instantly as a stiff wind flowing through the wind turbine. In addition, the effectiveness of the proposed MPEA scheme without mechanical sensors for the wind generation system is indirectly verified by the experimental results of a wind-power emulation system with a PMSG driven by an induction motor