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Title: Analysis, design, and experimental results of a novel soft-switching snubberless current-fed half-bridge front-end converter-based pv inverter
Authors: Prasanna, U.R.
Rathore, A.K. 
Keywords: Current-fed converter
high frequency
photovoltaic (PV) inverter
renewable energy system
Issue Date: 2013
Citation: Prasanna, U.R., Rathore, A.K. (2013). Analysis, design, and experimental results of a novel soft-switching snubberless current-fed half-bridge front-end converter-based pv inverter. IEEE Transactions on Power Electronics 28 (7) : 3219-3230. ScholarBank@NUS Repository.
Abstract: This paper proposes a new novel snubberless current-fed half-bridge front-end isolated dc/dc converter-based inverter for photovoltaic applications. It is suitable for grid-tied (utility interface) as well as off-grid (standalone) application based on the mode of control. The proposed converter attains clamping of the device voltage by secondary modulation, thus eliminating the need of snubber or active-clamp. Zero-current switching or natural commutation of primary devices and zero-voltage switching of secondary devices is achieved. Soft-switching is inherent owing to the proposed secondary modulation and is maintained during wide variation in voltage and power transfer capacity and thus is suitable for photovoltaic (PV) applications. Primary device voltage is clamped at reflected output voltage, and secondary device voltage is clamped at output voltage. Steady-state operation and analysis, and design procedure are presented. Simulation results using PSIM 9.0 are given to verify the proposed analysis and design. An experimental converter prototype rated at 200 W has been designed, built, and tested in the laboratory to verify and demonstrate the converter performance over wide variations in input voltage and output power for PV applications. The proposed converter is a true isolated boost converter and has higher voltage conversion (boost) ratio compared to the conventional active-clamped converter. © 1986-2012 IEEE.
Source Title: IEEE Transactions on Power Electronics
ISSN: 08858993
DOI: 10.1109/TPEL.2012.2222932
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