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Research on Fault Analysis and Protection of DC Fast Charging Station for Electric Vehicles

wallpapers News 2021-06-11
Research on Fault Analysis and Protection of DC Fast Charging Station for Electric Vehicles
Charging stations are supporting service facilities for electric vehicles, and their level of construction and development is critical to the process of large-scale and industrialization of electric vehicles. Unlike other distributed charging facilities, the planning and operation of charging stations are more limited by the charging behavior of users Habits and other factors, therefore, the high-power fast charging method is more suitable for this kind of centralized charging place. Compared with the charging station of the AC power supply mode, the DC (type) fast-charging station has less power conversion level, which is convenient for photovoltaic and energy storage DC type distribution
The advantages of DC power supply access and other advantages have become a hot spot in recent years. The research on DC charging stations is still in the preliminary stage, and the lack of effective protection solutions is currently one of the main barriers restricting the promotion and application of DC fast-charging stations. Relevant research. This article gradually goes deeper from the three levels of fault propagation characteristics, fault characteristics analysis, and protection method schemes, and studies the fault characteristics of DC charging stations and corresponding protection methods.
In order to provide a reference basis and theory for the protection design and implementation of DC fast-charging stations Support. As the basis of fault analysis and protection research, first, study the composition and modeling of DC charging stations. Based on the composition of the key equipment of the system, the topology and control strategy of AC power supply, grid-connected converter, DC charger, and car battery load An in-depth analysis was carried out. With reference to the technical standards of the existing charging station, an electromagnetic transient model of the DC charging station was built based on the Simulink platform, and the system operating characteristics and model control methods were tested and verified through simulation. The AC/DC grid-connected converter is The fault response of the interface between the charging station and the AC side distribution network that plays a decisive role in the fault propagation characteristics between the AC and DC sides of the system.

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