Enhanced direct quadrature control implementation for a three-phase inverter

Abstract

Power electronics is widely utilized in various fields, such as the military, daily life, and industry. The efficiency of power conversion applications is important. Three-phase inverters are primarily used in motors and UPS systems. However, the design of a three-phase inverter requires advanced knowledge of software, hardware, and algorithms. The digital control of the three-phase inverter provides flexibility for the adjustment of output voltage and frequency. The combination of Sinusoidal Pulse Width Modulation (SPWM) and Direct Quadrature (DQ) control increases the stability of output voltage. In this thesis, we present an implementation of a three-phase voltage source inverter using the Digital Signal Processor (DSP) based controller of TMS320F28379D. There are three electronic cards in the system. The first card includes Switched-Mode Power Supplies (SMPS), current sense circuits, and three half-bridges using discrete MOSFETs. The second card comprises of a low-loss filter and a voltage sensing circuit. The input voltage of the three-phase inverter is 30 V, and the output is a three-phase inverter with an output voltage that can be adjusted up to 12 V with an output frequency of 50 Hz. The maximum power of the inverter is 98.5 W. The efficiency of the inverter is 90.72 % at the full load.