Sensorless PMSM Drive Using Adaptive Harmonics Elimination based Modified Flux Observer with Regenerative Braking Capability for LEV Application

This paper presents, the sensorless PMSM drive for light electric vehicle (LEV) using modified rotor flux observer (FO) with regenerative braking capability. In order to accurate flux estimation for flux observer technique, the unknown initial integral value, higher order harmonics, DC components are the major impediments. To overcome these issues, conventional flux observer along with an adaptive band pass filter is utilized in this work for sensorless speed and position estimation. Furthermore, a robust model predictive current controller (MPCC) is employed to evade cascading of linear controllers and eliminate modulator. In addition to this, regenerative braking is incorporated in this work, which helps to improve the driving range of the EV as well as eliminate the risk of deep discharge of the battery in case of uphill driving situation. The system configuration is simulated in MATLAB/Simulink and its effectiveness is validated with the obtained results.