BIDIRECTIONAL POWER CONVERTER SYSTEM IMPLEMENTATION IN LIMITED POWER GRID

Simulation analysis of bidirectional power converters system for charging station of electric vehicle in condition of limited power source in city infrastructure is considered in the paper. Electric vehicles can be automobiles, trucks or vessels with electric propulsion system. Power limitations may be caused by obsolescence of the electrical infrastructure, as well as the historical, architectural, or economic features of city or its districts infrastructure. To use charging stations matching the latest standards without global upgrade of infrastructure, these limitations need to be overcome, which is possible with external energy storage units delivered to the charging station. In general case, the energy from energy storage units can be used both to maximize load capacity and to transfer power to the AC power grid. The function of balancing power consumption between the grid and external energy storage units is connected to the system of bidirectional power converters, which consists of a three-phase dual active bridge converter on the side of energy storage units and an active front-end on the side of AC grid; both converters are working on the common DC link. To implement such a system, galvanic insulation between the converter terminals and the external energy storage units is required, which is provided by the presence of a high-frequency power transformer in a three-phase dual active bridge converter. The three-phase dual active bridge converter is controlled by a phase modulation algorithm with a single-phase shift (single-phase switching). The active front-end is controlled by a space vector modulation algorithm. System modes involve transferring energy from the AC grid to the DC link through the active front-end, transferring energy from the external energy storage units to the DC link through a three-phase dual active bridge converter, joint transmission of energy from the grid and external storage units to the common DC link and transfer energy from the energy storage units to the grid. The simulation study and analysis have confirmed the workability of the proposed bidirectional power converter system and revealed the specifics of working in the joint transmission of energy by converters to a common DC link, requiring the introduction of additional cross-feedback between converters.

bidirectional power converter, power grid, phase modulation, single-phase switch, power converters system, dual active bridge, active front-end

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