Abstract
Increasing converter power density is a problem of topical interest. This paper discusses an interleaved approach of the efficiency increase in the buck-boost stage of an inverter with unfolding circuit in terms of losses in semiconductors, output voltage ripples and power density. Main trends in the power converter development are reviewed. A losses model was designed and used for the proposed solution to find an optimal number of interleaved cells. It describes static and dynamic losses in semiconductor switches for buck and boost mode. The presented calculation results demonstrate the efficiency of the interleaved approach for photovoltaic system. 1 kW power converter prototype was designed with two parallel dc-dc cells for experimental verification of obtained theoretical results. The experimental results confirm theoretical statements.
Highlights
The Google Little Box Challenge (GLBC) has shown a close relation with the topic of high-power density inverters for Photovoltaic (PV) applications that have demonstrated extremely high-power density of power electronics converters achievable [1–3]
Fast switching high voltage semiconductor devices are already available on the power electronics market
The GLBC solution is intended for narrow input voltage regulation, and it cannot provide a high and efficient PV energy conversion in heating or shadowing conditions
Summary
The Google Little Box Challenge (GLBC) has shown a close relation with the topic of high-power density inverters for Photovoltaic (PV) applications that have demonstrated extremely high-power density of power electronics converters achievable [1–3]. In the serial or string connection, one of the major drawbacks is a significant voltage drop at partial shadowing Both connections lead to a wide range of input voltage variation during the energy utilization time. The GLBC solution is intended for narrow input voltage regulation, and it cannot provide a high and efficient PV energy conversion in heating or shadowing conditions. An alternative is to use single-stage buck-boost for a single input dc source In this solution, inverters with an active boost cell are used [13–16]. In th2iosf 17 solution, inverters with an active boost cell are used [13–16] They can provide very high boost of the input voltage but suffer from high current spikes in semiconductors and passive elements. Wwhheerree NN iiss tthhee nnuummbbeerr ooff bbuucckk--bboooosstt cceellllss,, ii iiss tthhee ccuurrrreenntt cceellll nnuummbbeerr
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