Ensuring High Quality Power for Induction Motor Drive Through Thirty-Pulse Converter and Six-level 3P-2L-C5-VSI

High quality power through power converters for medium-voltage high-power industrial AC drive, is essential to enhance performance of the system, to reduce power losses and, thus, to improve the overall energy efficiency of the system. Multi-pulse and multi-level converters are the prominent solution for driving medium voltage induction motor (IM). This paper deals with a single unit of multi-winding transformer design with a phase displacement technique for a thirty-pulse power converter. This transformer has five-sets of three-phase secondary windings. This converter is utilized to ensure the quality of grid side current to adhere the power quality standard. Moreover, the DC voltages are generated through a 30–pulse converter, which are converted to AC voltages through a six-level 3P-2L-C5VSI converter. It is designed without any additional diode, bidirectional switches and floating capacitors. Although, the low frequency switching pulses for six-level 3P-2L-C5VSI are generated through a hybrid U-type and inverse U-type carrier waves-based modulation. Converter performance is ensured such that the quality of converter supplied motor currents meet the power quality standard. Simulation results are presented with closed-loop control to demonstrate high level of performance of medium voltage IM drive.