Sensorless Predictive Current Control of PMSM EV Drive using DSOGI-FLL Based Sliding Mode Observer

In this project, to eliminate lower order harmonics, DC offset, saturation, a sliding mode observer (SMO) with a dual second order generalized integrator frequency locked loop is proposed for a surface mounted Permanent Magnet Synchronous Motor (PMSM) based electric vehicle (EV) drive. Due to pure integrator problems and weakening of output at low speed, the conventional back-EMF estimation has limitations. Simple back-EMF component extraction with a traditional low pass filter is difficult and causes substantial phase delays in the estimated location and speed. 

This project deals with a sensor-less speed and location estimation technique (DSOGI-FLL). Together with the feed forward term, a novel method of using the DSOGI-FLL is shown to achieve better harmonic elimination of estimated back-EMF components and faster estimation of dynamic speed. For improved dynamic response, a delay compensated predictive current controller based PMSM EV drive is used with the proposed estimation technique. Simulation results shows that, compared to the traditional technique, the DSOGI-FLL based SMO has better efficiency. The proposed system is simulated by using MATLAB/SIMULINK.

Keywords: Permanent Magnet Synchronous Machine, Sliding Mode Control, Sensorless Control, Phase Locked Loop.