Power Conditioning for a Small-Scale PV System with Charge-Balancing Integrated Micro-Inverter
- Authors
- Manoharan, Mohana Sundar; Ahmed, Ashraf; Seo, Jung-Won; Park, Joung-Hu
- Issue Date
- Sep-2015
- Publisher
- KOREAN INST POWER ELECTRONICS
- Keywords
- Micro-inverter; Multi-level inverter; Multi-output flyback converter; Total harmonic distortion
- Citation
- JOURNAL OF POWER ELECTRONICS, v.15, no.5, pp.1318 - 1328
- Journal Title
- JOURNAL OF POWER ELECTRONICS
- Volume
- 15
- Number
- 5
- Start Page
- 1318
- End Page
- 1328
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/8668
- DOI
- 10.6113/JPE.2015.15.5.1318
- ISSN
- 1598-2092
- Abstract
- The photovoltaic (PV) power conditioning system for small-scale applications has gained significant interest in the past few decades. However, the standalone mode of operation has been rarely approached. This paper presents a two-stage multi-level micro-inverter topology that considers the different operation modes. A multi-output flyback converter provides both the DC-Link voltage balancing for the multi-level inverter side and maximum power point tracking control in grid connection mode in the PV stage. A modified H-bridge multi-level inverter topology is included for the AC output stage. The multi-level inverter lowers the total harmonic distortion and overall ratings of the power semiconductor switches. The proposed micro-inverter topology can help to decrease the size and cost of the PV system. Transient analysis and controller design of this micro-inverter have been proposed for stand-alone and grid-connected modes. Finally, the system performance was verified using a 120 W hardware prototype.
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