High Reliable Medium Voltage Drive with Reduced Component Count of Converters

This paper presents a reduced component count power converter for the medium voltage induction motor drive (MVIMD). For critical applications, a compact size, less complex drive system is developed, which satisfies the power quality standard at the ends of the drive system. The proposed drive system is designed such that it has the least number of windings in the multi-winding transformer for a 36-pulse AC-DC converter and the least number of semiconductor switches for the five-level multilevel inverter as compared to the conventional topologies. Hence, the main concerns of this drive system are the reduction in the component count, weight, and losses of the system with excellent harmonics performance. The operational aspects of the topology such as circuit structure, design, and indirect field-oriented control (IFOC), and modulation technique (modified pulse width modulation technique) are explained. To guarantee the high reliability of the presented drive system, the drive model is developed in the Matlab/Simulink 2018b, whereas the simulated results are analyzed in steady-state and in dynamic states for a 298.4kW, 4kV medium-voltage induction motor.