SRF-PLL based sensor-less control strategy using improved dead-beat controller for direct-driven permanent magnet synchronous generator (PMSG)

This paper has proposed a sensor-less control strategy for direct-driven permanent magnet synchronous generator (PMSG). Synchronous rotating frame phase lock loop (SRF-PLL) that employs model based back elector-motive force (EMF) estimation is utilized to derive rotor position angle and speed. To steadily achieve the sensor-less vector control, a first order compensator is applied in cascade with the estimated back EMF. Then, an improved dead-beat controller based on luenberger predictive algorithm is presented to compensate for the one-step delay, further enhancing the robustness against motor parameter deviations and whole sensor-less control performance. Finally, experimental results are shown to illustrate that proposed sensor-less strategy and controller design scheme could well achieve high performance vector control of the PMSG.