Journal
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
Volume 68, Issue 9, Pages 7996-8005Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2020.3016245
Keywords
Power conversion harmonics; pulse width modulation inverters
Categories
Funding
- H2020 Spartan [821381]
- Spanish Science and Innovation Ministry [TEC2016-78430-R]
- Consejeria de Economia, Conocimiento, Empresas y Universidad [PY18-1340]
- H2020 Societal Challenges Programme [821381] Funding Source: H2020 Societal Challenges Programme
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The cascaded H-bridge converter (CHB) is a suitable solution for various applications, but the discontinuous pulsewidth modulation (DPWM) used in this article to reduce switching losses leads to high harmonic distortion in the output voltage. The method proposed in this article cleverly groups the cells to mitigate basebands harmonic distortion and applies a variable-angle PS-PWM technique to reduce sidebands harmonics content, demonstrating good performance in experimental results.
The cascaded H-bridge converter (CHB) is a very suitable solution with inherent modularity for many applications such as flexible ac transmission systems and motor drives. In this article, the discontinuous pulsewidth modulation (DPWM) by clamping some power cells is used in the CHB because it permits to reduce the switching losses in the power devices. However, this provokes a high harmonic distortion (basebands and sidebands harmonics) in the CHB output voltage compared with the quality obtained avoiding to clamp cells, just applying the conventional phase-shifted PWM (PS-PWM) technique. This has been studied for the three-cell CHB topology but the extension for an N-cell CHB with several clamped cells is a challenge that is addressed in this article. A generalized CHB harmonic voltage analysis applying the DPWM method is presented considering multiple clamped cells. The harmonic distortion mitigation target can be decoupled into two objectives. The proposed method cleverly groups the cells (one clamped + one or two nonclamped cells) to mitigate the basebands harmonic distortion. Simultaneously, a variable-angle PS-PWM technique is applied to the CHB in order to mitigate the sidebands harmonics content. Experimental results demonstrate the good performance of the proposed method.
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