CCTV news:The 2023 World Energy Storage Conference concluded on November 10 in Ningde, Fujian. Multiple latest information from the Ministry of Industry and Information Technology shows that my country’s energy storage industry ecology has initially taken shape. Among them, new energy storage performs well and the installed capacity continues to increase. As of the end of September 2023, my country has completed and put into operation new energy storage projects with a cumulative installed capacity of 21.23 million kilowatts, ranking among the top in the world.
At the same time, energy storage technology has developed diversified and continuously iterated, and technologies such as lithium-ion batteries and compressed air energy storage have reached the international leading level. According to statistics, in the first three quarters of 2023, my country’s cumulative energy storage battery shipments were 157.2 GWh, accounting for more than 90% of global shipments.
Energy storage technology plays an important role in improving new energy efficiency
How much electric energy is used by users, how much electric energy the power system will produce, and the entire power grid system is in a state of dynamic balance at any time. In building a new power system dominated by new energy, energy storage technology is playing an increasingly important role in how to improve the efficiency of new energy use.
Current energy storage methods are mainly divided into two categories, one is physical energy storage and the other is chemical energy storage. Physical energy storage mainly includes pumped hydro energy storage, compressed air energy storage and gravity energy storage.
At the Jintan Salt Cave Compressed Air National Experimental Demonstration Power Station in Changzhou, Jiangsu Province, this power station can store electrical energy in abandoned underground salt caverns. It uses electricity to drive the air compressor to charge at night when the electricity load is low. The process is like inflating the “balloon” of the salt cave, compressing the air of 1 standard atmosphere into high-pressure air of 140 standard atmospheres. When needed during the day, the compressed air is released with one click to generate huge kinetic energy to drive the generator to generate electricity.
Chemical energy storage mainly includes lithium batteries, lead-acid batteries, flow batteries, sodium-ion batteries, etc. In the Huadian Laicheng energy storage peaking project in Shandong, a flow battery energy storage system was added. The project charges the battery when electricity consumption is low, converting the electrical energy into chemical energy in the battery and storing it. Reusing the battery to discharge during peak power consumption is equivalent to a large “power bank” for the power grid, which can improve the stability of the power grid and ensure the security of the power grid.
As a technology that can store and release energy, energy storage is like a huge “power bank” and has huge potential in solving the contradiction between power supply and demand, improving energy utilization efficiency, and reducing environmental pollution.
Vehicle energy integration and ecological development explore new paths for new energy storage
In the first three quarters of 2023, my country’s cumulative energy storage battery shipments were 157.2 GWh, accounting for more than 90% of global shipments. In building a new power system dominated by new energy, energy storage technology is playing an increasingly important role in how to improve the efficiency of new energy use. In addition to being a means of transportation, new energy vehicles also have energy storage functions and are expected to become part of urban energy storage power stations in the future. Wuxi, Jiangsu Province is exploring the two-way interaction between vehicles and the power grid.
At the largest car-network interactive demonstration center in China, new energy vehicle owners experience reverse charging of new energy vehicles. After connecting the new energy vehicle to the charging and discharging pile, he clicks the discharge button in the mobile app. After the device automatically checks the vehicle’s discharge capacity, it can reverse charge to the power grid within 30 seconds. After charging, he will receive corresponding points rewards that can be used to offset the charge. Deduct the next charging fee.
In recent years, my country’s new energy vehicles, especially electric vehicles, have grown rapidly, with the number currently exceeding 10 million. Data released by the National Energy Administration in August showed that the total number of charging facilities in my country was nearly 7 million, ranking first in the world.
Taking the Wuxi area as an example, the number of new energy vehicles in Wuxi has grown explosively in the past two years. As of now, there are 193,000 vehicles in the Wuxi area. With the orderly promotion of vehicle-network interaction, it is estimated that the adjustable resources of new energy vehicles in Wuxi will reach 350,000 kilowatts, which can meet the daily electricity consumption of more than 20,000 households.
In the future, the new energy charging station is expected to become a small energy storage power station, which can help the power grid optimize the load curve, achieve peak shaving and valley filling, and form a highly integrated “transportation network” and “energy network”.