Recently, the National Development and Reform Commission, the National Energy Administration and other four departments jointly released the first batch of pilot cities and projects for large-scale application of vehicle-network interactions in my country, totaling 39. Among them, the first batch of cities that pilot large-scale application of car-network interaction include 9 cities including Shanghai, Changzhou, and Hefei. There are 30 pilot projects, including the pilot project of Beijing's new energy storage-based vehicle-network interactive collaborative regulation, the pilot project of Tianjin's Vehicle-network interactive demonstration center, and the large-scale application project of Baoding's Vehicle-network interactive.

  The most familiar scene for electric car owners is to use charging piles to charge their cars. In this process, the relationship between the electric vehicle and the power grid is a passive one-way input. Car-network Interactive (V2G) promotes the exchange of power between new energy vehicles and the power grid, and the two sides have both come and go. New energy vehicles are charged in an orderly manner during the trough of electricity consumption; during the peak of electricity consumption, the electricity in the battery is reversely "selled" to the power grid to provide power support.

  There are many benefits to realizing car-network interaction. For electric car owners, car network interaction can reduce the cost of using a car and earn profits. For charging pile operators, they can explore new operating models such as charging station participation in power grid demand-side response and power auxiliary service market to effectively increase revenue. More importantly, vehicle-network interaction can improve the access capability of distribution networks, awaken the "sleeping" energy storage peak-shaving potential of electric vehicles, help new energy consumption, and support the construction of a new energy system.

  Previously, car-network interactive exploration has been carried out nationwide. At the end of 2023, the National Development and Reform Commission, the National Energy Administration and other departments issued the "Implementation Opinions on Strengthening the Integration and Interaction of New Energy Vehicles and Power Grids", proposing to vigorously cultivate a new industrial ecology of integrated and interactive vehicles and networks, and carry out large-scale pilot demonstrations of vehicle-network interaction in the Yangtze River Delta, Pearl River Delta, Beijing-Tianjin-Hebei-Shandong, Sichuan-Chongqing and other regions, and strive to build more than 5 demonstration cities and more than 50 two-way charging and discharge demonstration projects by the end of 2025.

  With policy support, some electric car owners have started a new "electricity selling" experience. On March 28, the largest car-network interaction in the country was launched in the Southern Power Grid business area. More than 100,000 new energy vehicles participated in the interaction, and the power of the interaction reached 500,000 kilowatt-hours. Five provinces, including Guangdong, Guangxi, Yunnan, Guizhou and Hainan, carried out vehicle-network interactions at the same time, and more than 100,000 secondary new energy vehicles in 63 cities participated. This is the first time that such a large-scale car-network interaction has been carried out in the country, and it is also the first cross-provincial linkage.

  Huzhou City’s high-power AC charging and discharging application pilot project is one of the projects on this pilot list. The project selects three major scenarios: electric trucks, electric sanitation vehicles, and electric buses in Anji, Zhejiang, and explores a new solution to the problem-solving ideas of vehicle-network interaction. "At present, V2G charging and discharging equipment basically uses DC power in the national market, with high equipment costs, long discharge time and low market investment intentions." Zhao Yanlong, head of the Rural Energy Revolution Special Team of State Grid Anji County Power Supply Company, introduced that this project is to innovate and develop supercurrent drive technology, adopt low-cost and high-power AC charging and discharging technology, and achieve a reduction of the comprehensive cost of charging and discharging vehicles and facilities by more than 50%, which can effectively solve the bottleneck problem that restricts V2G charging and discharging equipment in the large-scale application of vehicle-network interaction. This is also the first time in the country that the county-level high-power AC two-way charging and discharging technology has been implemented and verified in large-scale application and verification.

  In recent years, my country has made positive progress in the formulation and promotion of charging peak-to-valley time-sharing electricity prices, the aggregation of vehicle-network interactive resources to participate in auxiliary services and demand response pilot verification, and the feasibility verification of two-way charging and discharging technology. However, in the next stage of the need for the integration and interaction between large-scale new energy vehicles and the power grid, there are still many constraints.

  Liu Xiaoshi, executive deputy secretary-general of the China Electric Vehicle Hundred People Association, believes that in order to achieve large-scale commercial promotion, Car-Net Interactive needs to overcome many hurdles such as technology, standards, models, and mechanisms. In terms of technology, the more diverse application scenarios of vehicle-network interaction put forward higher requirements for the battery's high-frequency two-way charging and discharge cycle life and safety prevention and control technology. In terms of standards, vehicle-network interaction spans multiple fields such as automobiles, power grids, transportation, charging, communications, infrastructure, etc., and it is necessary to accelerate the construction of a unified standard system in all links of the vehicle-pile-network from a collaborative perspective.

  Experts suggest that in the next step, we should increase the research and development of key technologies for power batteries, continue to improve the cycle life of power batteries without significantly increasing costs, overcome battery safety prevention and control technologies under high-frequency two-way charging and discharge, and accelerate the formulation and revision of national and industry standards related to vehicle-network interaction. Optimize and improve the supporting electricity prices and market mechanisms, realize the comprehensive application of time-sharing electricity prices for residents' charging peak and valleys, study and explore the price mechanism for discharge of power grids by new energy vehicles and charging and swapping stations, and further stimulate the flexible adjustment potential of various charging and swapping facilities. (Reporter Wang Yichen)

[Editor in charge: Ran Xiaoning]