Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 35, Issue 6, Pages 5978-5986Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2019.2951382
Keywords
11-level inverter; active-neutral-point-clamped (ANPC); multilevel inverter (MLI); nine-level inverter; seven-level inverter; voltage boosting
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Funding
- National Research Foundation of Korea (NRF) - Ministry of Science and ICT [NRF-2018M3C1B9088457]
- Korea Institute of Energy Technology Evaluation and Planning (KETEP) from the Ministry of Trade, Industry & Energy, South Korea [20194030202370]
- Malaysian Ministry of Higher Education through Fundamental Research Grant Scheme [FRGS/1/2018/TK04/USMC/02/1]
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Conventional active-neutral-point-clamped (ANPC) inverters exhibit low voltage gain that inherently leads to a high dc-link voltage requirement. An improved ANPC inverter that is capable of generating five voltage levels has recently reduced the dc-link voltage twofold to achieve unity gain. This led to the development of a single-stage dc-ac power converter with no frontend boost dc-dc converter. This article proposes novel ANPC inverters capable of unity or boosted voltage gain while generating higher voltage levels. The first topology can provide a voltage gain of 1.5 and extends the number of levels to seven by incorporating only one additional switch. The topology can also be extended by adding three switches and one floating capacitor to generate nine levels with unity voltage gain, or 11 levels with a voltage gain of 2.5. The proposed ANPC inverters and their operations are comprehensively discussed. Experimental results are provided to validate the feasibility of the proposed ANPC inverters.
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