DESIGN OF ISOLATED DC-DC CONVERTER FOR MULTIPLE ELECTRIC VEHICLES CHARGING

Abstract

There are various converters used for high power fast Electric Vehicle charging station. In which some of the most used converters are Dual Active Bridge (DAB) based, Modular Multilevel Converter (MMC) based, Inductive power Transfer (IPT) based, interleaved half bridge submodule based, Parallel Hybrid Converter DAB based etc. But there are certain advantages and disadvantages of the abovementioned converters. Like for DAB, the advantages are high efficiency and high-power density, but the disadvantages are its complex control requirements, and for MMC the advantages are scalability and modularity, but the disadvantages are high initial cost, footprint is more, and the Energy Storage Requirement (ESR) is more in sinusoidal modulation compared to trapezoidal modulation. But this report presents a novel converter which has advantages of both MMC and DAB and reduces the disadvantages of both the converters. In one side of the transformer, it is simply two level VSC converter and on the other side it is hybrid leg with one MMC leg. The advantages of this converter are high efficiency, high power density, scalability, modularity etc. The trapezoidal control strategy has been used in this report, so the requirement of big submodule/compartment capacitor is reduced. Therefor a detailed mathematical analysis of Hybrid Bridge based Isolated DC-DC converter (HBIDC) with trapezoidal modulation technique has been carried out in this report. And the proposed HBIDC converter is analysed by MATLAB Simulink environment, and it has also been validated through hardware in loop called OPAL-RT.