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Energies 2017, 10(7), 846; doi:10.3390/en10070846

Cross-Regulation Assessment of DIDO Buck-Boost Converter for Renewable Energy Application

Division of Electricity, Department of Engineering Sciences, Angstrom Laboratory, Box: 534, Uppsala University, SE-75121 Uppsala, Sweden
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Received: 5 April 2017 / Revised: 8 June 2017 / Accepted: 21 June 2017 / Published: 25 June 2017
(This article belongs to the Section Electrical Power and Energy System)
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Abstract

When medium- or high-voltage power conversion is preferred for renewable energy sources, multilevel power converters have received much of the interest in this area as methods for enhancing the conversion efficiency and cost effectiveness. In such cases, multilevel, multi-input multi-output (MIMO) configurations of DC-DC converters come to the scenario for integrating several sources together, especially considering the stringent regulatory needs and the requirement of multistage power conversion systems. Considering the above facts, a three-level dual input dual output (DIDO) buck-boost converter, as the simplest form of MIMO converter, is proposed in this paper for DC-link voltage regulation. The capability of this converter for cross regulating the DC-link voltage is analyzed in detail to support a three-level neutral point clamped inverter-based grid connection in the future. The cross-regulation capability is examined under a new type of pulse delay control (PDC) strategy and later compared with a three-level boost converter (TLBC). Compared to conventional boost converters, the high-voltage three-level buck boost converter (TLBBC) with PDC exhibits a wide controllability range and cross regulation capability. These enhanced features are extremely important for better regulating variable output renewable energy sources such as solar, wind, wave, marine current, etc. The simulation and experimental results are provided to validate the claim. View Full-Text
Keywords: dual input dual output (DIDO) converter; three-level buck boost converter (TLBBC); pulse delay control (PDC); neutral point clamped inverter; cross-regulation; renewable energy conversion dual input dual output (DIDO) converter; three-level buck boost converter (TLBBC); pulse delay control (PDC); neutral point clamped inverter; cross-regulation; renewable energy conversion
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Elamalayil Soman, D.; Leijon, M. Cross-Regulation Assessment of DIDO Buck-Boost Converter for Renewable Energy Application. Energies 2017, 10, 846.

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