Abstract
In this paper, an isolated multi-resonant three-port bidirectional direct current-direct current (DC-DC) converter is proposed, which is composed of three full bridges, two inductor-capacitor-inductor-capacitor (LCLC) multi-resonant tanks and a three-winding transformer. The phase shift control method is employed to manage the power transmission among three ports. Relying on the appropriate parameter selection, both of the fundamental and the third order power can be delivered through the multi-element LCLC resonant tanks, and consequently, it contributes to restrained circulating energy and the desirable promoted efficiency. Besides, by adjusting the driving frequency under different load conditions, zero-voltage-switching (ZVS) characteristics of all the switches of three ports are guaranteed. Therefore, lower switching loss and higher efficiency are achieved in full load range. In order to verify the feasibility of the proposed topology, a 1.5 kW prototype is established, of which the maximum efficiencies under forward and reverse operating conditions are 96.7% and 96.9% respectively. In addition, both of the bidirectional efficiencies maintain higher than 95.5% when the power level is above 0.5 kW.
Highlights
Nowadays, facing the increasingly severe energy crisis and pollution issues, considerable attention is being focused on renewable power sources to figure out promising solutions [1,2,3]
metal-oxide-semiconductor field effect transistor (MOSFET) adopted in the system is a 1.5 kW prototype is built and tested in the laboratory
The MOSFETs adopted in the system is
Summary
Nowadays, facing the increasingly severe energy crisis and pollution issues, considerable attention is being focused on renewable power sources to figure out promising solutions [1,2,3]. Owing to the time-varying and intermittent output features of some renewable sources, energy storage plays an indispensable role to improve the stability and energy utilization rate of the distributed energy generation system (DEGS) [4,5,6]. In existing DEGS, the renewable energy sources, storage units and loads are connected together by their independent converters. The large number of converters leads to complexity in the DEGS architecture. This issue is addressed by adopting three-port converters, where the efficiency, the cost and the power density are optimized. Three-port bidirectional DC-DC converters (TP-BDCs) have become a competitive alternative in recent years
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