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Prospects for the use of rechargeable battery electric vehicles as regulators of the network or backup power supplies in accordance with the concepts of V2G (Vehicle to Grid) and G2V (Grid to Vehicle) are described. The requirements for bidirectional power converters are defined: a wide range of input voltage parameters, correction of the input current power factor, maximum power take-off from renewable energy sources, high energy efficiency. The chosen topology of the bidirectional dual active bridge converter, which supports soft switching of transistors at zero voltage and the proposed modular approach to the construction of converters, has a number of advantages: provide any voltage or current, reduce ripple, high efficiency, high reliability, due to the ability to include backup modules that can be replaced by the main in case of failure, reduction of the size of reactive elements and the ability to operate each cell on other frequencies. The most effective type of cell combination for the main task is developed input parallel and output parallel connection are allows sharing input and output current between the modules. The dependence of the ripple coefficient on each cell is defined. The calculation of one cell of converters, namely the calculation of high-frequency transformer, transistors, and smoothing LC-filter is presented and the comparative analysis of technical indicators in one-cell and multi-cell converters is carried out. Modeling in Matlab Simulink software environment, evaluation of the effect of using a modular converter when working with DC and AC sources, comparison of ripple coefficients in converters with a different number of a cell at a constant value of the parameters of the LC-filter, and selected filter parameters at which one coefficient of pulsations is applied. The simulation results showed that the coefficients of the ripple are decreasing depending on the number of cells of the transducer in accordance with the dependence obtained by analytical calculations. Thus, the results are confirming the correctness of the calculations and prove the efficiency of the use of modular transformation topology.

vìsnik nacìonalʹnogo tehnìčnogo unìversitetu "hpì". novì rìšennâ v sučasnih tehnologìâh/vestnik nacionalʹnogo tehničeskogo universiteta "hpi". novye rešeniâ v sovremennyh tehnologiâh

Modular electric vehicle battery charger with bidirectional power flow