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Abstract
In this paper, a power supply system for hybrid renewable energy conversion is proposed, which can process PV (photovoltaic) power and wind-turbine energy simultaneously for step-down voltage and high current applications. It is a dual-input converter and mainly contains a PV energy source, a wind turbine energy source, a zero-voltage-switching (ZVS) forward converter, and a current-doubler rectifier. The proposed power supply system has the following advantages: (1) PV-arrays and wind-energy sources can alternatively deliver power to the load during climate or season alteration; (2) maximum power point tracking (MPPT) can be accomplished for both different kinds of renewable-energy sources; (3) ZVS and synchronous rectification techniques for the active switches of the forward converter are embedded so as to reduce switching and conducting losses; and (4) electricity isolation is naturally obtained. To achieve an optimally dynamic response and to increase control flexibility, a digital signal processor (DSP) is investigated and presented to implement MPPT algorithm and power regulating scheme. Finally, a 240 W prototype power supply system with ZVS and current-doubler features to deal with PV power and wind energy is built and implemented. Experimental results are presented to verify the performance and the feasibility of the proposed power supply system.
Highlights
Serious greenhouse effects and limited fossil energy supplies have forced most engineers to do research on renewable energy sources [1]
To develop PV and wind energy sources to substitute for fossil fuels has been an important topic [3,4,5]
PV arrays and wind energy are complementary since sunny days in summer are usually calm and strong winds often occur in winter
Summary
Serious greenhouse effects and limited fossil energy supplies have forced most engineers to do research on renewable energy sources [1]. The typical renewable energy sources include solar, wind and geothermal energies, which have the features of cleanliness, abundance and freedom from maintenance [2]. Solar and wind are most widely utilized renewable energies. To develop PV and wind energy sources to substitute for fossil fuels has been an important topic [3,4,5]. PV arrays and wind energy are complementary since sunny days in summer are usually calm and strong winds often occur in winter.
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