Different Ways of Charging Electric Vehicles

On March 26, Wang Wen, deputy general manager of State Grid Electric Vehicle Service Co., Ltd., attended the 2022 China Electric Vehicle Hundred People’s Meeting and delivered a speech.

He pointed out that the vigorous development of wind energy, solar energy, biomass energy, ocean energy, geothermal energy, etc., will continue to improve new technologies. The proportion of energy consumption and the construction of a new power system with new energy as the main body is a strategic measure to implement the new development concept and do a good job of dual carbon work.

However, the large-scale development of new energy, a high proportion of grid connection, strong randomness of power generation, and difficulty in power prediction have brought severe challenges to our power grid operation control.

Wang Wen pointed out that the main solution is to decouple the real-time balance between power generation and power consumption by building large-scale energy storage in the power system, and the fluctuation of new energy power generation is stabilized by energy storage. But building energy storage will increase the cost of the grid and greatly increase the price of electricity. Wang Wen believes that electric vehicles are a more affordable option to balance new energy power generation.

The power battery carried by the electric vehicle can not only be charged for driving but also can be discharged in the reverse direction. It is estimated that there will be 25 million electric vehicles in the country in 2025 and 80 million in 2030, and the energy storage resources are expected to exceed 5 billion kWh.

Through technologies such as charging and swapping load aggregation regulation, orderly charging, and V2G charging and discharging, allowing electric vehicles to actively participate in the operation of the power system, matching the characteristics of clean energy power generation, and promoting clean energy consumption are of great significance to the construction of a new power system. Make full use of the power sponge characteristics of electric vehicles to realize large-scale and high-efficiency dispatching control of charging and swapping loads. High” and “Twin Peaks” puzzles provide solutions.

Car network interaction practice cases and operational results

Under the background of the dual carbon goals, with the continuous emergence of new technologies, new models, and new formats in the transportation and energy industries, the integrated development of transportation and energy with electricity as the link and vehicle-network interaction as the main direction has already met the conditions and foundations. It has become the consensus and development trend of the industry.

Integrate and coordinate electric vehicles, EV charging piles, and power grids, and change the time, location, and power of charging under the premise of meeting the changing needs of users, so as to realize the coordinated charging of multiple piles under the distribution network, the interaction of source and load under the large power grid, and the smooth use of electricity. Electricity peaks and valleys, stabilize new energy fluctuations and increase the proportion of charging and cleaning.

The study found that under the current coal-based power generation structure when electric vehicles are charged in disorder, the carbon emissions may be higher than that of traditional fuel vehicles. Only through effective scheduling and control can we fully absorb clean and green electricity and give full play to the carbon emission reduction advantages of electric vehicles.

EV car

State Grid electric vehicles have achieved some results in the interactive promotion and application of the vehicle network.

First, vigorously promote smart home charging services.

Private passenger vehicles are the most active and important group of electric vehicles. Electric vehicles have the best charging experience at home, the largest scale, and the best resource for vehicle-network interaction. Beijing, Shanghai, Tianjin, Zhejiang, and other 18 provinces and cities have built more than 150,000 charging piles in an orderly manner, covering more than 10,000 communities, serving more than 150,000 car owners, and transferring peak power of nearly 5 million kWh in a single month. 80% of users charge in the community and 80% charge in low valleys.

Second, based on the bidirectional charging and discharging technology, a mobile energy storage platform for electric vehicles has been developed, which can be used as a balancing resource for the large-scale connection of new energy to the power grid.

At present, 80% of the idle energy storage value of electric vehicles has not been fully utilized. In the future, 80 million electric vehicles will store 5 billion kWh of energy, which can provide 100 GW of regulation capacity, which is equivalent to 25 of the world’s largest pumped storage power stations. Save hundreds of billions of grid investment.

In Beijing China Re Building, State Grid Electric Vehicle has built the first commercial V2G charging station in the country. Users can charge more than 4,000 yuan per year through low-valley charging, peak-discharging, and participation in the electricity market. offset charging costs.

The third is to aggregate various resources and participate in various market transactions through the load control platform.

By the end of 2021, a total of 68,496 charging piles have been organized by State Grid Electric Vehicles to participate in the Beijing-Tianjin-Tangshan power peak shaving market, with an aggregated capacity of 1,934.55MW, contributing 199 million kWh of peak shaving electricity, and reducing the amount of wind and electricity curtailment by 54 million kWh. 5.18 million people interacted with the Internet. A total of 3.241 billion kWh of clean green electricity was traded, 111 million person-times of electric vehicle users were organized to participate in green electricity consumption, and 2.325 billion kWh of green electricity was consumed. Through green electricity trading, ancillary services, and demand response, the company operated load aggregators and charging facilities. Market participants such as dealers and electric vehicle users passed on dividends of 116 million yuan. Effectively guide and motivate electric vehicle users to participate in clean green electricity consumption and power grid optimization operation, initially practice “new energy vehicle charging new energy electricity”, and achieve good social effects.

China EV charger station

Suggestions for the construction of charging facilities

In the context of green and low-carbon travel, driven by the digital economy, the electric vehicle industry ecology will gradually evolve from a traditional “chain relationship” between upstream and downstream into a multi-domain and multi-subject participation in automobiles, and energy, transportation, information, and communications. “Mesh Ecology”. Open cooperation, collaborative innovation, symbiosis, and win-win have become the characteristics of the times for the development of the electric vehicle industry.

Similarly, charging electric vehicles with new energy and making electric vehicles a new energy vehicle requires the participation of the whole society, including the government, charging operators, power grid companies, new energy vehicle companies, and users. To this end, Wang Wen put forward three suggestions for the construction of charging facilities in the future.

First, we must increase policy support.

Local governments should speed up the introduction of fuel vehicle purchase and travel restrictions, and incorporate heavy trucks, construction machinery, and other commercial vehicles into the dual-point system as soon as possible. Referring to Shanghai’s incorporation of orderly charging technology into the local standards for private piles, policies such as the implementation of peak-valley electricity prices for charging and swapping, and participation in the electricity market for charging and swapping are implemented.

The financial subsidy for charging and swapping facilities has shifted from the construction link to the user link, the inclination towards orderly charging and charging of green electricity has been increased, and the coordinated interaction between vehicles and the power grid is encouraged to better consume clean energy.

Strengthen the overall planning and coordination of new energy vehicles and energy planning, electricity market and carbon market reform, etc., increase the importance and promotion of vehicle-network interaction, build an industry joint research system, and actively create a transportation energy integration innovation platform and vehicle Internet interaction standardization system.

Second, we must speed up the construction of the charging network.

Power grid enterprises should strengthen the overall coordination with urban and rural planning, power grid construction and property parking, etc. For car owners with parking spaces, they should carry out one-stop online and one-stop services from the links of “purchasing cars and running electricity – installing piles and receiving electricity – charging services – value-added services”. , to promote the charging of smart homes into the community, and intelligent interactive charging piles should be built.

For communities without fixed parking spaces, jointly carry out the construction of community public charging stations to meet the changing needs of users nearby. In terms of high-speed charging and urban public charging, ensure the power supply support, and fully support the capital of all parties to participate in the construction of charging facilities.

In terms of platform services, we will continue to improve interconnectivity, ensure that all kinds of charging facilities are connected, and provide efficient and convenient services such as “smart pile selection”, “plug and charge”, and “non-inductive payment”, so as to comprehensively improve users’ green electricity Great travel experience.

The third is to strengthen the scale of car-network interaction.

New energy vehicle companies sell vehicle pile products with intelligent interactive functions, and accelerate the transformation from traditional one-way charging to intelligent and orderly charging and two-way charging and discharging.

First, the supply side must build electric vehicles that can adapt to intelligent and orderly charging and two-way charging and discharging. Secondly, the sales side should vigorously promote intelligent and orderly charging and two-way charging and discharging piles to form a good vehicle-network interaction pattern.

Power grid companies should cooperate with all parties to jointly tackle key issues of vehicle-network interaction technology, unify vehicle-network interaction standards, ensure vehicle-to-pole charging matching and information exchange, and accelerate the construction of vehicle-network interactive energy service platforms, organically integrate vehicle-to-vehicle and pile-to-net platforms, and aggregate and guide more.

Many electric vehicles participate in the construction of new power systems, participate in clean green electricity consumption and power system balance, and truly turn electric vehicles into new energy vehicles.

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