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DC power bus type charging and discharging system
First, the system overview
Electric vehicle is the main direction of the future development of the automobile industry, is an effective way to develop low carbon economy. At the early stage of the development of electric vehicle industry, the national policy support and promotion, mainly to carry out the demonstration work in the public service field of each big city, such as electric buses, electric sanitation vehicles, electric taxis, through the demonstration effect, gradually to the social and public promotion. Development of electric vehicles, priority needs to build the infrastructure of electric vehicles supporting energy supply. At present, the theory of the planning and design of electric vehicle charging station in China is not perfect, and it is in the stage of demonstration and exploration. The system optimization design of the charging and replacing power station plays an important role in the implementation of the project construction, safe and stable operation and economic operation management, and it should be the key research content of the infrastructure construction. This system is an ideal electric vehicle charging and discharging system, it can be used in energy storage, photovoltaic micro grid system, it is the trend of future development.

Two, system structure

DC power bus charge discharge system CDS-DPbus (Direct power bus form charge-discharge system) is composed of AC power distribution unit, large power bidirectional AC/DC cell array, DC power bus unit, DC feeder and monitoring unit, distributed bidirectional DC/DC converter array, integrated charging cabinet system, new energy access unit, integrated adaptive substation communication network scheduling management system.
Three, the control principle of the system
Four, the role and characteristics of the system
1) the use of electric energy is based on the demand of the optimization of integrated scheduling;
2) to the charging system, simplify the terminal equipment;
3) due to the high voltage DC bus, the line diameter and the quantity of the transmission line are greatly reduced;
4) unified power bus, distributed DC/DC configuration is more flexible;
5) the volume of equipment is reduced, the integration degree is increased, and the area of the equipment is greatly reduced;
6) the project cost will be greatly reduced;
7) the two-way interaction between electric vehicle and power grid can be realized, which will lay a good foundation for the development of smart grid;
Five, the use of the system
1 electric vehicle charging and discharging system;
2 distributed power supply
3 energy storage, micro network