Analysis of Switching Frequency Effects on THD and Switching Losses in a Filtered Single-Phase SPWM Inverter
Abstract
This paper investigates the effect of switching frequency on total harmonic distortion (THD) and switching losses in a single-phase sinusoidal pulse width modulation (SPWM) inverter with an LC output filter. Using MATLAB/Simulink, the inverter is modelled with a 400V DC input, H-bridge IGBTs and a damped LC filter designed to suppress high frequency harmonics. The switching frequency varied between 5KHz and 25KHz and output quality was evaluated through FFT analysis. The results show that THD remains extremely low (0.02-0.07%) across all tested frequencies due to the strong filtering effect of the LC, indicating that increasing switching frequency has no significant harmonic benefit. Conversely, switching losses varies linearly with frequency. The optimal operating frequency for the modelled system is 5KHz as it keeps the switching loss at the minimum while maintaining excellent waveform.
Keywords
Switching Frequency, Total Harmonic Distortion (THD), Single-Phase Inverter, Switching Loss, Filter
Citations
IRE Journals:
Innocent Omoyibo, Godspower Idode, Wisdom Omoregbee, Ozah Osemudiamen, Helen Osunde "Analysis of Switching Frequency Effects on THD and Switching Losses in a Filtered Single-Phase SPWM Inverter" Iconic Research And Engineering Journals Volume 9 Issue 5 2025 Page 1334-1340 https://doi.org/10.64388/IREV9I5-1712131
IEEE:
Innocent Omoyibo, Godspower Idode, Wisdom Omoregbee, Ozah Osemudiamen, Helen Osunde
"Analysis of Switching Frequency Effects on THD and Switching Losses in a Filtered Single-Phase SPWM Inverter" Iconic Research And Engineering Journals, 9(5) https://doi.org/10.64388/IREV9I5-1712131
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