Abstract
This paper presents a comparative analysis of the harmonics generated in the output waveforms of 3-phase Hbridge cascaded multi-level inverter topology using Sinusoidal Pulse Width Modulation (SPWM) techniques. The Alternate Phased Opposite Disposition- Pulse Width Modulation (APOD-PWM) is one of the best SPWM schemes in achieving reduction in the Total Harmonic Distortion (THD), which is the major parameter often used to assess the suitability of an inverter. However, due to the closely set carrier arrangement, the APOD-PWM produces high THD especially at switching frequencies above 1-kHz. In this paper, a Gapped APOD-PWM is proposed. The switching sequence is similar to the APOD-PWM technique, but it has smaller switching angle. This reduces the switching overlap at boundary positions and hence the THD. The technique was simulated using the MATLAB-SIMULINK toolbox. The output current and voltage signals were evaluated and the THD was computed using SIMULINK-FFT tool. Results show that the proposed technique is able to further reduce THD at all switching frequencies.
| Original language | English |
|---|---|
| Pages (from-to) | 560-567 |
| Number of pages | 8 |
| Journal | Journal of Engineering and Applied Sciences |
| Volume | 9 |
| Issue number | 4 |
| Publication status | Published - 2014 |
Keywords
- Alternate phased opposite disposition - pulse width modulation
- GAPOD-PWM
- H-bridge
- Matlab/simulink
- THD