Comparative Analysis of Bipolar and Unipolar SPWM Techniques in PIC-Based Pure Sine Wave Single-Phase Inverters

Authors

  • Aymen Chaaira Processes, Energy, Environment and Electrical Systems Laboratory, University of Gabes, Gabes, Tunisia
  • Habib Kraiem Department of Electrical Engineering, College of Engineering, Northern Border University, Arar, Saudi Arabia
  • Rabiaa Gamoudi Processes, Energy, Environment and Electrical Systems Laboratory, University of Gabes, Gabes, Tunisia
  • Lassaad Sbita Processes, Energy, Environment and Electrical Systems Laboratory, University of Gabes, Gabes, Tunisia
Volume: 14 | Issue: 3 | Pages: 14395-14401 | June 2024 | https://doi.org/10.48084/etasr.7150

Abstract

This paper provides a comparative analysis of bipolar versus unipolar Sinusoidal Pulse Width Modulation (SPWM) in DC-AC inverters, focusing on Total Harmonic Distortion (THD) across modulation indices and the latter’s effects on the R-L loads. Using the PIC18F2431 microcontroller for its efficiency, a single-phase inverter accomplished to deliver a high-fidelity sine wave. This study discovered that while both SPWM methods reduce harmonics, the unipolar approach yields more uniform THD reduction and superior performance, particularly noticeable in RL load conditions, where minimal harmonic distortion is crucial. The bipolar inverter, despite a higher initial THD, shows a considerable improvement at higher indices, significantly enhanced by an LC low-pass filter. This filter is a key component in achieving sub-1% THD levels at full modulation, ensuring optimal sine wave quality. The findings highlight the operational differences between the SPWM techniques and the importance of the LC filters in ameliorating the inverter output for various power applications.

Keywords:

Single Phase Inverter, Bipolar SPWM, Unipolar SPWM, THD, PIC18F2431

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[1]
Chaaira, A., Kraiem, H., Gamoudi, R. and Sbita, L. 2024. Comparative Analysis of Bipolar and Unipolar SPWM Techniques in PIC-Based Pure Sine Wave Single-Phase Inverters. Engineering, Technology & Applied Science Research. 14, 3 (Jun. 2024), 14395–14401. DOI:https://doi.org/10.48084/etasr.7150.

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