Abstract
System efficiency and cost effectiveness are of critical importance for photovoltaic (PV) systems. This paper addresses the two issues by developing a novel three-port dc-dc converter for stand-alone PV systems, based on an improved Flyback-Forward topology. It provides a compact single-unit solution with a combined feature of optimized maximum power point tracking (MPPT), high step-up ratio, galvanic isolation, and multiple operating modes for domestic and aerospace applications. A theoretical analysis is conducted to analyze the operating modes followed by simulation and experimental work. This paper is focused on a comprehensive modulation strategy utilizing both PWM and phase-shifted control that satisfies the requirement of PV power systems to achieve MPPT and output voltage regulation. A 250-W converter was designed and prototyped to provide experimental verification in term of system integration and high conversion efficiency.
Original language | English |
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Pages (from-to) | 3068-3076 |
Number of pages | 9 |
Journal | IEEE Transactions on Power Electronics |
Volume | 30 |
Issue number | 6 |
Early online date | 18 Jun 2014 |
DOIs | |
Publication status | Published - Jun 2015 |
Bibliographical note
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- DC–DC power conversion
- maximum power point tracking
- phase shift
- photovoltaic power system
- voltage control