Abstract
The objective of this paper is to propose a multi-input DC-DC converter with bidirectional power flow control capability. Compared to the traditional power converter, the multi-input converter (MIC) can save on the number of components and the circuit cost. Under normal conditions, the MIC is able to transfer energy from different input sources to the load. However, if the battery module is adopted, both the charging or discharging features should be considered. Therefore, the bidirectional power flow control of the MIC is necessary. On the other hand, because of the inconsistency characteristics of batteries, unbalanced circuit operation might occur whereby the circuit and the battery might be damaged. Therefore, dynamic current regulation strategies are developed for the MIC. Consequently, the proposed MIC circuit is able to achieve the bidirectional power flow control capability as well as control the input currents independently. Detailed circuit analysis and comprehensive mathematical derivation and of the proposed MIC will be presented in this paper. Finally, both simulation and experimental results obtained from a 500 W prototype circuit verify the performance and feasibility of the proposed bidirectional multi-input converter.
Highlights
Nowadays, global environmental protection and green energy sources are being paid high attention to deal with the fossil fuel usage and carbon dioxide emission issues [1,2]
Converters should be utilized, as seen in the conceptual diagram shown in Figure 1a, where if the two input sources, Vin1 and Vin2 are replaced by battery modules, the charging or discharging current can be controlled independently via the two DC-DC converters
The novelty and main features of this paper can be summarized as follows: (1) Four power switches with synchronous rectification feature are included in the multi-input converter (MIC) circuit to enhance the control flexibility as well as to improve the circuit efficiency; (2) the bidirectional power flow control with both charging and discharging capability are realized; (3) the dynamic current regulation are proposed and developed to control the input currents independently
Summary
Global environmental protection and green energy sources are being paid high attention to deal with the fossil fuel usage and carbon dioxide emission issues [1,2]. A semi-isolated MIC for hybrid PV/wind power charger system was presented in [23], with a topology composed of isolated and/or non-isolated DC-DC converters These proposed circuits and methods are effective, battery charging applications and the bidirectional power flow control are not considered and discussed. The aim of this paper is to propose a multi-input DC-DC converter with bidirectional power flow control ability for energy storage applications. The novelty and main features of this paper can be summarized as follows: (1) Four power switches with synchronous rectification feature are included in the MIC circuit to enhance the control flexibility as well as to improve the circuit efficiency; (2) the bidirectional power flow control with both charging and discharging capability are realized; (3) the dynamic current regulation are proposed and developed to control the input currents independently. The performance and feasibility of the proposed bidirectional MIC topology and control strategies will be verified by both simulation and experimental results of a 500 W prototype circuit
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