Performance Enhancing of Single-Phase Voltage Source Inverter Through Average-Based Pulse Delay Time Compensation

Abstract

The effectiveness of a Voltage Source Inverter (VSI) operating in a single-phase configuration controlled using Pulse Width Modulation (PWM) depends on multiple factors, particularly a special attention given to the Delay Time (DT) linked to the switching of power devices within the same arm. The ramifications of DT in a single-phase VSI have notable effects on output quality, harmonic content, and transient responsiveness. In this paper, a DT compensator is implemented for a single-phase VSI using the Average Based Pulse Compensation (ABPC) method. This technique adjusts switching instant to counteract the effects of DT and mitigate voltage distortions, reduce harmonic content, and enhance waveform quality. Simulations and validations are performed using MATLAB/Simulink to evaluate compensator performance under different operating conditions. The compensator design is implemented in hardware through the utilization of an FPGA SPARTAN 6 XC6SLX9 controller, tasked with generating a PWM pulse. The quality of ouput voltage and current has been improved by ABP compensation and the THD is reduced by 20%. Additionally, a laboratory testing phase is conducted to assess the performance of the proposed method, involving the validation of a prototype for a single-phase PWM inverter.