Abstract
This paper proposes a non-isolated three-port converter which integrates the input port, battery port, and load port into one converter for renewable energy applications. The coupled inductor and switched capacitor are used to achieve high voltage gain and three power switches can be utilized to realize the power flows between the sources, the battery, and the load. The energy stored in the leakage inductance is recycled to reduce the voltage stress of the power switch. In addition, various operating stages are analyzed and design considerations are presented. Compared to the relevant converters, the proposed converter can realize power flows and achieve high voltage gain by using few components. Finally, a laboratory prototype of the proposed converter with input port voltage 24 V, battery port voltage 48 V, and output voltage 400 V with 200 W rated power is implemented to validate the feasibility and effectiveness of the theoretical analyses.
Highlights
Renewable energy resources(RESs)are widely used because of environmental concerns and energy resource diversity
The three-port converter (TPC) topologies can be classified into three types: fully-isolated TPCs (FITPCs) [4], [5], partly-isolated TPCs (PITPCs) [6]–[8], and non-isolated TPCs (NITPCs) [9]–[23]
PITPCs and FITPCs suffer from topology complexity and low efficiency; the NITPCs are widely adopted in the energy storage systems (ESSs) resulting in compact size and high efficiency
Summary
Renewable energy resources(RESs)are widely used because of environmental concerns and energy resource diversity. Energy storage systems (ESSs) are usually to smooth the output from the RESs [3]. Reduce the cost, size and complexity of the RESs system, three-port converter (TPC) integrates converters for transferring among sustainable energy sources, ESS, and the load to provide an appropriate voltage to meet the load demand as shown in Fig.. The TPC topologies can be classified into three types: fully-isolated TPCs (FITPCs) [4], [5], partly-isolated TPCs (PITPCs) [6]–[8], and non-isolated TPCs (NITPCs) [9]–[23]. PITPCs and FITPCs suffer from topology complexity and low efficiency; the NITPCs are widely adopted in the ESS resulting in compact size and high efficiency. Since RESs and ESSs are low voltage, high step-up converters are required to
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