Design, Implementation and Control of a SiC-Based T5MLC Induction Drive System

Aboubakr Salem

doi:10.1109/access.2020.2991691

Abstract

This paper presents and evaluate a prototype of an advanced topology of five-level T-type MLC, namely “T5MLC”, implemented within a complete AC induction drive. The evaluation is based on the ability of balancing the converter DC link capacitor voltages, the torque and flux ripples reduction of the induction motor under control, the harmonic analysis and the efficiency of the inverter and the overall drive system. The converter implementation and design considerations using Silicon Carbide (SiC) discrete MOSFETs are discussed. The operation and the analytical model of T5MLC using switching-functions are presented. The model predictive control (MPC), as a preferred AC drive control approach, is selected to adapt the machine torque and flux, and to balance the DC link capacitor voltages. The T5MLC drive system is tested at different scenarios; i.e. suddenly load changing and speed reversal, to ensure the converter capability and excellent performance in AC drive applications. The experimental results show that the MPC could achieve an excellent performance in terms of low harmonic distortions, reduced flux and torque ripples and the ability of balanced DC link capacitors. In addition, the loss analysis showed that the T5MLC is 5.5 % to 24.8 % efficient compared to dual T-type MLC at different loading conditions.

Highlights

Diode-Clamped Multilevel Converter (DCMLC) has been enhanced in terms of lower number of semiconductor devices; the matter that reduces the converter cost [1].The associate editor coordinating the review of this manuscript and approving it for publication was Zhixiang Zou .One of the enhanced DCMLC is known as T-type MLC
Case I (Ignoring Capacitor Balancing): in which the drive system will be tested while neglecting the capacitor balancing
The results show that the T5MLC IM drive system is efficiency is higher than that of dual T-type (DTT) system

Summary

Introduction

Diode-Clamped Multilevel Converter (DCMLC) has been enhanced in terms of lower number of semiconductor devices; the matter that reduces the converter cost [1].The associate editor coordinating the review of this manuscript and approving it for publication was Zhixiang Zou .One of the enhanced DCMLC is known as T-type MLC. The three-level (3L) and five-level (5L) T-type topologies, have been evaluated compared to the conventional DCMLC in [2], [3] and a better performance has been observed. Modified topologies based on the 3L T-type MLC have been introduced in [4]–[7] to produce 11-, 13-, 15-level and higher voltage levels topologies. These topologies are made in fixable configuration to be extended to higher voltage levels for single-phase circuit. The inverter efficiency has been evaluated compared to the conventional 5L DCMLC and a good performance is observed. Experimental validation for this has not been introduced yet

Objectives

Results

Conclusion