Journal
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
Volume 54, Issue 1, Pages 494-504Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIA.2017.2753160
Keywords
DC/DC converter; multi-input converter (MIC); multilevel inverter; renewable energy (RE) source integration; zero current switching (ZCS)
Funding
- Department of Science and Technology, Government of India
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A new isolated current-fed zero-current switched (ZCS) front-end dc/dc converter based multilevel inverter is proposed for multi-input applications. The proposed front-end converter with only two controllable switches integrates two different renewable energy sources, resulting in an advantageous compact structure and low conduction losses. The ZCS turn-OFF is achieved in both the controllable switches with the proposed modulation scheme. The converter maintains ZCS turn-OFF under a wide load, as well as input voltage variations by employing frequency modulation along with a variable duty ratio technique. Simple structure, soft switching, high gain, and automatic load regulation make the converter structure novel for simultaneous power management in multi-input renewable energy applications. Converter operation and design guidelines have been outlined. A laboratory prototype of the proposed converter is developed and tested at 300-W power level. Simulations and experimental results demonstrate the robust performance of the converter under load, as well as input source voltage variations.
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