Performance Evaluation of Unipolar Sinusoidal Pulse Width Modulation based Inverter for Power Quality Improvement
Abstract
The growing need for high quality AC power in current electrical and renewable energy systems has resulted in an increased requirement for efficient inverter topologies with improved harmonic performance. This study discusses the performance evaluation of a single phase inverter based on Unipolar Sinusoidal Pulse Width Modulation (SPWM) for power quality improvement. The system suggested is based on full bridge inverter topology controlled by unipolar SPWM switching to provide AC output with decreased harmonic distortion and improved waveform quality. The inverter model is designed and analyzed via simulation platform with RLC loading circumstances. The system performance is evaluated in terms of output voltage characteristics, load current behavior, RMS values and Total Harmonic Distortion (THD). The simulation results show that the inverter is capable of producing a high-quality load current waveform with considerably decreased harmonic content, even with switching harmonics in the inverter output voltage. The THD recorded for the current is restricted to 4.27% which indicates that the harmonics are well mitigated and the power quality performance is enhanced. The study demonstrates that the unipolar SPWM approach gives superior quality of waveform and improved performance of inverter for single phase power conversion applications.
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