Estimation of PMSG Rotor Speed for Sensor-less MPPT Control Method in Wind Energy System

Permanent magnet synchronous generator (PMSG) has a significant role in variable speed wind energy system (VSWES), so this manuscript proposes a simple scheme to estimate the rotor speed of PMSG and its rotor position angle based on back EMF (electromotive force) observer and phase-locked loop (PLL). Electrical sensor can observe the Back EMF utilizing the output terminals AC current and voltage of PMSG, these values of current and voltage can be converted from abc reference frame to dqo reference frame. The rotor speed of PMSG and its rotor position angle can be estimated utilizing the basics of PLL to adjust the frequency of the output signal using the difference between the output phase of system and the given signal phase till the output signal track the given signal phase of the frequency. The estimated rotor position angle is exploited as a reference angle in the conversion scheme from abc reference frame to dqo reference frame. It is easy to achieve sensor-less maximum power point tracking (MPPT) control scheme utilizing the estimated rotor speed of PMSG. The simulation results, using PSIM software program, confirm the accuracy of the proposed technique.