For V2G applications, improving power density, reducing input and output current ripple, and having reactive power compensation capability are the major research directions for bidirectional AC/DC converter. Bidirectional grid-connected AC/DC converter is one of the indispensable parts in the V2G system, which can realize the sinusoidal input current and bidirectional power flow. Thus, it is essential to support energy injection back to the grid in V2G system. If the G2V charger does not employ the state-of-the-art conversion, this may lead to disturbances in grid, such as undesirable peak loads, harmonics, and low power factor. Owing to the fact that the power of typical electrical vehicles is twice higher than the average household load, the grid network will be stressed by the fast charging. The power converter is unidirectional for G2V in general, which includes conventional and fast charging system. Generally, both V2G and G2V applications are suitable for “V2G.” EVs and PEVs not only can be loads in grid-to-vehicle (G2V) charge mode but also can be generators in vehicle-to-grid (V2G) discharge mode. There are a lot of advantages about EVs and PEVs, such as peak power regulating, peak load shifting, environment protection, low cost, and so on. Plug-in Electric Vehicles (PEVs) and Electric Vehicles (EVs) have attracted increasing attention worldwide, due to the representativeness of new energy vehicles. Thus, it is urgent to use new and clean energy worldwide. Recently, with the environmental degradation, climate change, and the shortage of fossil energy, the traditional energy costs have risen a lot. The simulation and experiment results are shown, and the results evaluate the effectiveness of the model and the performance of the applied control strategy.
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. 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. Firstly, the configuration of V2G systems is introduced, and the mathematical model of the AC/DC converter is built.
It can be used to achieve the bidirectional power flow between EVs and grid, supply reactive power compensation, and smooth the power grid fluctuation. A three-phase bidirectional grid-connected AC/DC converter is presented in this paper for V2G systems. 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.
As the key role, the Vehicle-to-Grid (V2G) has been attracting increasing attention. The smart grid and electric vehicles (EVs) are widely used all over the world.
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