Keywords: hybrid phase shifted carrier modulation, five–phase multilevel inverter, multiphase induction motors, digital signal processing, DSP, power loss analysis, harmonic distortion, torque ripple, energy efficiency
Hybrid phase shifted carrier modulation fed five–phase multilevel inverter for multiphase induction motor drive
This paper proposes an energy efficient modulation scheme suitable for multilevel inverter fed five–phase induction motor. Five–phase multilevel inverter provides good quality five–phase variable voltage and variable frequency supply to five–phase induction motor, which ensure reduced torque ripple and improved drive efficiency. This modulation inherits the features of fundamental frequency modulation and phase shifted carrier modulation in power conversion and resolves the contradiction between high frequency and accuracy in a digital control scheme. Base modulator and hybrid formulation control algorithms are realised with TMS320F2407 DSP processor and Xilinx XC95108 CPLD controllers. The performance studies with induction motor are evaluated in terms of power loss, weighted total harmonic distortion and torque ripple. Selected simulation and experiment results are reported to verify and validate the effectiveness of the proposed technique.