Abstract
This work presents the strategy for vector control of permanent magnet synchronous motor (PMSM) drive fed with a three-phase multi-level voltage source inverter for high performance. In the present work, the traditional 2-level inverter is replaced with a novel reduced switch 5-level inverter, and comparative analysis is done. The implementation of the five-level inverter improves the torque, stator current, and mechanical dynamics of the drive. Here PWM technique is employed to generate the gate pulses for switching devices in a planned sequence to obtain five-level output voltage. The 12 operating modes are defined for reduced switch 5-level inverter that produces voltages as 0, ±2Vdc/3, ±Vdc, ±4Vdc/3 with reduced total harmonics distortion (THD). The close-loop vector control of PMSM with developed five-level inverter is implemented to improve the performance of drive in terms of rise time, settling time, stator current harmonics. The overall system is developed in MATLAB/Simulink and investigations are done in different input command and loading conditions. An extensive simulation study and analysis of results reveal the potential of the present work. This work mainly focuses on the reduction of motor electromagnetic torque pulsations along with improved speed response.
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