Introduction to the working principle and system of electric vehicle access network technology
V2G is the abbreviation of Vehicle-to-grid. Its core idea is: the interaction between electric vehicles and the power grid, using the energy storage of a large number of electric vehicles as a buffer for the grid and renewable energy. When the grid load is too high, the electric vehicle stores energy to the grid; and when the grid load is low, it is used to store the excess power generated by the grid to avoid waste. In this way, electric vehicle users can buy electricity from the grid when the electricity price is low, and sell electricity to the grid when the grid price is high, thus obtaining certain benefits.
Research status at home and abroad
At present, there are only a few institutions involved in this field at home and abroad. Most of the research and demonstrations are in the United States. Representatives are the team led by Professor Willlett Kempton of the University of Delaware, and the joint research between Nissan Motor Co. and General Electric. team. Domestically, there are some researches on the State Grid and schools, and they are still relatively fur. In general, there are only some preliminary studies at home and abroad, and the research framework is clear, but it is still far from practical application.
working principle
The principle is quite simple, that is, two-way interaction, the difficulty is still in the battery, electric vehicle V side control, and grid G ​​side scheduling control.
Interactive effect
Current research direction
Charging load calculation
The charging load is the basis for studying the charging problem of electric vehicles.
The impact of electric vehicle scale access on the power grid
Large-scale access to electric power distribution networks of electric vehicles, due to the high randomness of their charging time, will affect the network loss, power quality, reliability, stability, etc. of the distribution network. Research work, so far, most of the research focused on both network loss and power quality.
Electric vehicle ordered charging control
This direction is more popular, and most people in this direction are studying this. The orderly charging control of electric vehicles can effectively alleviate the negative impact of large-scale electric vehicles entering the power grid.
Power grid planning and scheduling based on V2G
Both new energy vehicles and electric vehicles have high random characteristics. Studying their joint scheduling can not only reduce the impact of the randomness of new energy on the grid, increase the consumption of new energy, but also achieve the clean and low carbonization of electric vehicles. This part of the individual feels very difficult, the order of magnitude goes up, the requirements for the platform and scheduling strategy are very high. Others, such as the battery requirements for two-way transmission, the electricity price policy or something.
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