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CURRENT-FED QUADRATIC FULL-BRIDGE BUCK CONVERTER FOR PV SYSTEMS INTERFACING: STATIC OPERATION
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| Author(s) |
Juha HUUSARI, Teuvo SUNTIO |
| Abstract |
Interfacing a single photovoltaic (PV) module into either a single-phase or a three-phase inverterrequires an interfacing converter with wide conversion range and sufficient dynamic headroom. Interms of avoiding issues with common-mode currents between the PV module and the inverter, aconverter with galvanic isolation is preferred. This is especially important with the emerging thin-filmmodules that have larger cell-to-frame parasitic capacitances compared to traditional modules. Thispaper presents the current-fed quadratic full-bridge buck converter (CFQFB) for the first time anddiscusses its steady-state operation. The foundation for the proposed topology is based on the conceptof true current-fed converters that differ fundamentally from the conventional voltage-fed convertersas will be discussed. The relevant analytical steady-state equations and waveforms are presented firstwith the operational details of the proposed converter. The analytical claims are verified withextensive measurement results from a corresponding 190-W prototype. According to themeasurements, the prototype reached an efficiency of 92\% at the maximum power point (MPP) of thePV module. |
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| Filename: | 0045-epe2011-full-15140611.pdf |
| Filesize: | 532.9 KB |
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| Type |
Members Only |
| Date |
Last modified 2012-01-26 by System |
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