Abstract
This study proposes a novel isolated bidirectional multiport converter (MPC) based on a switched-capacitor converter and a half-bridge converter with an effective control scheme for photovoltaic (PV) powered and battery buffered systems. The proposed power electronics converter interface integrates the converters to which the ports are connected with a battery coupled common dc busbar and high frequency transformer (HFT). Thus, the three-port converter is formed without any need for an additional converter to regulate battery power flow. In addition, to transfer power from a low voltage PV energy unit to the battery and load, a single switch DC-DC converter with high voltage gain is proposed. The power flow between the ports is controlled by an effective multi-loop control scheme that is able to perform a smooth transition between the loops. In order to validate the viability and effectiveness of the proposed MPC, a 3 kW proof-of-concept model has been developed with a 3 kW PV and 220 V 12 Ah battery. The performance of the proposed converter has been analyzed for different case studies, including dynamic operating and loading conditions.
Highlights
In the last few decades, the use and depletion of fossil fuels have accelerated in parallel with the significant increase in electricity demand [1]
This paper proposes a new multi-port converter (MPC) that is equipped with switched-capacitor DC-DC converter in order to integrate renewable energy sources (RESs) with an isolated DC-DC converter via a battery coupled common busbar
The power circuit configuration of the proposed MPC which is illustrated in Figure 1 consists of a half-bridge converter, a controlled full-wave rectifier, a switched-capacitor DC-DC converter, and a secondary center-tapped high-frequency transformer (HFT)
Summary
In the last few decades, the use and depletion of fossil fuels have accelerated in parallel with the significant increase in electricity demand [1]. The environmental concern and depletion of fossil fuels have led to develop renewable energy sources (RESs) powered clean applications such as electric vehicles [2], microgrids [3], residential grid-tie inverters [4]. RESs are good candidates for the aforementioned applications because of such advantages, they are by nature unstable in their availability and capacity [6]. Traditional RES-powered systems have high computational loads and costs. To overcome the aforementioned limitations, multi-port converters (MPC) are used, wherein RES-based energy units, battery units, and loads are connected to different ports of the MPC
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