Dynamic Simulation of Six-Pulse Voltage Source Inverter for a Three-Phase Induction Motor

Abstract

This research investigates the use of dynamic simulations approach for a 3-phase induction motor driven by a Six-pulse Voltage Source Inverter (6p-VSI). The objective of the study is to develop a simulation model of a three-phase inverter drive system using a Six-pulse Voltage Source Inverter to drive a three-phase induction motor under various load torque conditions. The simulation setup comprises a rectifier-inverter subsystem using six semiconductor switches, controlled by a pulse generator, and integrated with a braking chopper and voltage controller. A DC voltage source feeds the inverter, which converts it to an AC output used to power a 3-phase, 2238 VA induction motor rated at 220 V, 50 Hz. A Proportional-Integral controller is used to regulate DC link voltage while step changes in load torque are applied to the motor shaft to study system behavior. In the initial simulation stage, an acceleration ramp of 2000 rpm is applied, and the system reaches steady-state at 1.3 seconds. In the second stage, a dynamic torque load ranging from -11 N·m to +11 N·m is introduced between 3 and 4 seconds to simulate practical load variations. Simulation results demonstrate that the inverter system effectively handles transient responses and maintains motor stability with acceptable performance. These findings validate the potential of the 6p-VSI system in industrial applications requiring robust dynamic response.