High performance control of a permanent magnet wind power generation system using an adaptive sliding observer

The paper proposes an adaptive sliding observer to accurately estimate the rotor position for a direct-drive permanent magnet synchronous generator (PMSG). Without any position sensor, the generator torque and flux responses retain high performance both in the steady state and during transients. The problem on the shaft encoder installation difficulty, reliability and disturbance in encoder cable is remedied and the reliability of the PMSG generating system is increased. The grid voltage orientation control is implemented into the grid converter in which nearly sinusoidal input current and fast dc link voltage regulation can be achieved. Experimental results verify the effectiveness of the proposed observer for PMSG and high performance power production can be obtained.