Abstract
The smart grid and electric vehicles (EVs) are widely used all over the world. As the key role, the Vehicle-to-Grid (V2G) has been attracting increasing attention. The bidirectional grid-connected AC/DC converter is one of the indispensable parts in the V2G system, which can realize bidirectional power flow and meet the power quality requirements for grid. A three-phase bidirectional grid-connected AC/DC converter is presented in this paper for V2G systems. It can be used to achieve the bidirectional power flow between EVs and grid, supply reactive power compensation, and smooth the power grid fluctuation. Firstly, the configuration of V2G systems is introduced, and the mathematical model of the AC/DC converter is built. Then, for bidirectional AC/DC converters, the grid voltage feedforward decoupling scheme is applied, and the analysis of PI control strategy is proposed and the controller is designed. The system simulation model is established based on MATLAB/Simulink, and the experiment platform of the bidirectional grid-connected converter for V2G is designed in lab. The simulation and experiment results are shown, and the results evaluate the effectiveness of the model and the performance of the applied control strategy.
Highlights
With the environmental degradation, climate change, and the shortage of fossil energy, the traditional energy costs have risen a lot. us, it is urgent to use new and clean energy worldwide
An 80 kW V2G system simulation model is established in MATLAB/Simulink. e control schemes mentioned above are applied to the AC/DC converter
A three-phase bidirectional grid-connected AC/DC converter for V2G system is presented in this paper
Summary
With the environmental degradation, climate change, and the shortage of fossil energy, the traditional energy costs have risen a lot. us, it is urgent to use new and clean energy worldwide. Both [13, 14] have the same function, which can reduce the battery charge and discharge current ripple, neither of them could work with wide output voltage. E advantages of this converter are high efficiency and achieved the bidirectional power flow, but it will reduce the battery life owing to the input current ripple. Ere are several different disadvantages in the topologies mentioned above when used in V2G, such as the narrow output voltage range, large losses, and high input current ripple. A three-phase bidirectional grid-connected converter for V2G system is analyzed and designed in this paper, which realized bidirectional power flow, high efficiency, unity power factor, and wide battery pack voltage range.
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