Abstract
An efficient way of synthesizing a three port non-isolated converter from a single-ended primary inductor converter (SEPIC) is proposed in this paper. The primary SEPIC converter is split into a source cell and a load cell. Two such source cells are integrated through direct current (DC) link capacitors with a common load cell to generate a three-port SEPIC converter. The derived converter features single-stage power conversion with reduced structural complexity and bidirectional power flow capability. For bidirectional power flow, it incorporates a battery along with an auxiliary photovoltaic source. Mathematical analyses were carried out to describe the operating principles and design considerations. Experiments were performed on an in-house-built prototype three-port unidirectional converter, and the results are presented to validate the feasibility of the designed converter.
Highlights
Renewable energy resources are of potential interest nowadays due to environmental problems, high oil prices, global warming, and the depletion of fossil fuels
To overcome the intermittent nature of energy resources, future power systems will require the interfacing of various energy sources using multisource technology
To enable multi-source technology, a multi-input power converter (MIPC) that can accommodate a variety of sources, as shown in Figure 1, seems to be essential
Summary
Renewable energy resources are of potential interest nowadays due to environmental problems, high oil prices, global warming, and the depletion of fossil fuels. A generic structure of a single-ended primary-inductor converter (SEPIC)-based multi (m)-input DC–DC converter is investigated in Reference [17]. This converter utilizes (m-2) +3 switches to interface ‘m’. Power budgeting using DC link voltage and current control methods have been analyzed in Reference [22] To overcome drawbacks such as the size and control complexity due to the isolated transformer and a greater number of components, and to have a flexible integration of the diversified energy resources of different characteristics, a compact, high-profile power electronic interface is required.
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