Abstract
Considering the fact that electric vehicle battery charging based on the current charging station is time-consuming, the charging technology needs to improve in order to increase charging speed, which could reduce range anxiety and benefit the user experience of electric vehicle (EV). For this reason, a 1 MW battery charging station is presented in this paper to eliminate the drawbacks of utilizing the normal 480 VAC as the system input to supply the 1 MW power, such as the low power density caused by the large volume of the 60 Hz transformer and the low efficiency caused by the high current. The proposed system utilizes the grid input of single-phase 8 kVAC and is capable of charging two electric vehicles with 500 kW each, at the same time. Therefore, this paper details how high-voltage SiC power modules are the key enabler technology, as well as the selection of a resonant-type input-series, output-parallel circuitry candidate to secure high power density and efficiency, while intelligently dealing with the transient processes, e.g., pre-charging process and power balancing among modules, and considering the impact on the grid, are both of importance.
Highlights
Considering the fact that electric vehicle battery charging based on the current charging station is time-consuming, the charging technology needs to improve in order to increase charging speed, which could reduce range anxiety and benefit the user experience of electric vehicle (EV)
The growing interest in electric vehicle (EV) technology is due to their minimum fuel emissions and air pollution
Sixteen hours are needed for level-1 chargers, while only 10 minutes are needed for extreme fast chargers (XFCs)
Summary
Transportation is revolutionizing as the world welcomes the benefits of electric transportation. Sixteen hours are needed for level-1 chargers, while only 10 minutes are needed for extreme fast chargers (XFCs) This by itself shows how the charging process can impact the adoption of plug-in hybrid electric vehicles. While the majority of EV fast charging stations in the United States have a grid connection of three-phase 480 VAC, which is rectified into a DC bus (normally between 600 VDC and 800 VDC), followed by a DC/DC converter with galvanic isolation. Using such an approach to provide 1 MW sees a challenge from high grid current, which in turn challenges the 480 VAC transformer design. To enhance the system power density and reduce cost, elimination of such bulky and heavy grid transformers is a must [5]
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