Modified DSOGI-PLL Based Position Sensorless PMBLDC Motor Drive for LEV Application

This paper deals with a novel position estimation method for a permanent magnet BLDC motor using dual second order generalized integrator-phase locked loop (DSOGI-PLL) for a solar-PV panel and battery fed PMBLDC motor drive. A position sensorless PMBLDC motor drive is designed aiming for light electric vehicle (LEV) applications with regenerative braking. Proper commutation is a prime requirement for a high-end application like EVs. Commutation error deteriorates PMBLDC motor drive performance and leads to distorted current with highly pulsating torque. The system also becomes mechanically unstable with noise and vibration from the machine shaft. Commutation error originates from low-pass filter, delay, phase lag, or variation in machine parameters, etc. In this work, a novel DSOGI-PLL based position estimation technique is proposed. However, the PLL technique is utilized for rotor angle estimation in PM motor drive. The implemented DSOGI-PLL has a superior disturbance rejection capacity with proportional-resonant (PR) controller and robust to any type of phase delay and phase lag in the system. A continuous input current DC-DC converter fed solar-PV panel and battery powered powertrain with energy regeneration makes a complete solution for last mile connectivity. Obtained results validate the proposed algorithm.