Abstract
In this paper, a comparative analysis has been presented of two equivalent circuits of non-isolated buck/buck-boost converters under synchronous control, used in a stand-alone Photovoltaic-battery-load system. The first circuit consists of two cascaded buck and buck-boost classical converters with two controllable switches. The buck converter is used to extract the maximum power of the Photovoltaic source, and the buck-boost converter is applied for the output voltage level control. The second circuit consists of a proposed converter with a single controllable switch. In both cases, the switching frequency is used to track the maximum power point and the duty ratio controls the output voltage level. Selected simulation results and experimental tests confirm that the two conversion circuits have identical behavior under synchronous control. This study shows that the single switch converter has a lower size and cost, but it is limited in the possible control strategy.
Highlights
Due to the increasing environmental concerns, many research studies have targeted the use of Renewable Energy Sources (RES) as an alternative to fossil fuels
The control validateThis the conduction modes for Figure is realized by a we can notice that the currents presented in Figures 13a,b have the same shape; The experimental results obtained the circuitOne withcan twonotice switches
The same switching pattern as previously battery‐load energy harvesting systems, we have proposed a unified approach that consists of forming an used (25 kHz frequency and 50% duty cycle) is applied to S
Summary
Due to the increasing environmental concerns, many research studies have targeted the use of Renewable Energy Sources (RES) as an alternative to fossil fuels. [3]), the resulting and equivalent circuit based on a single switch is obtained. In modified the two switches of the independently buck and buck‐boost converters are synchronously controlled, thethe duty cycle converter based on frequency the ESS, the parameters are theto same and are applied to the single switch. Design of the single switchgood converter from the simple conventional two-stage and satisfactory accuracy circuit presented in Figure[10]. Converters the design to of form the single switch converter from the conventional two‐stage the buck andnext buck-boost the ESS circuit under synchronous control. 4, and is based on selected simulation results are provided and discussed to validate the equivalence between the two the ESS conversion circuit.
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