Predictive Phase Locked Loop for Sensorless Control of PMSG Based Variable-Speed Wind Turbines

This paper proposes a new predictive phase locked loop (PLL) for sensorless control of permanent-magnet synchronous generators (PMSGs) in variable-speed wind energy conversion systems (WECSs). The idea of the proposed PLL is derived from the direct-model predictive control (DMPC) principle. The proposed PLL uses a finite (discretized) number of rotor angles to predict the back electromotive force (EMF) of the PMSG. Then, that predicted angle, which minimizes a pre-defined cost function, is selected to be the optimal rotor position/angle. Accordingly, the fixed-gain proportional-integral (PI) controller that is normally used in PLLs is eliminated. The performance of the proposed PLL has been validated experimentally and compared with that of the traditional one under various operation conditions and under parameter variations of the PMSG.     «

This paper proposes a new predictive phase locked loop (PLL) for sensorless control of permanent-magnet synchronous generators (PMSGs) in variable-speed wind energy conversion systems (WECSs). The idea of the proposed PLL is derived from the direct-model predictive control (DMPC) principle. The proposed PLL uses a finite (discretized) number of rotor angles to predict the back electromotive force (EMF) of the PMSG. Then, that predicted angle, which minimizes a pre-defined cost function,...     »