Improved sliding mode model reference adaptive system speed observer for fuzzy control of direct‐drive permanent magnet synchronous generator wind power generation system

This study presents an improved sliding mode model reference adaptive system (SM‐MRAS) speed observer for the fuzzy control of direct‐drive wind power generation system with a permanent magnet synchronous generator (PMSG). The SM‐MRAS speed sensorless observer is described and the corresponding algorithm is derived. The designed fuzzy controller is compared with the conventional PI controller by simulations and experiments. A dc motor is controlled to simulate the wind turbine and an active machine‐side converter with space vector pulse width modulation control is adopted to realise the maximum power extraction. A 250‐W PMSG experimental platform is built and the experiment results verify the validity of the proposed SM‐MRAS speed observer.