There are three main types of electric energy storage technology in the industry, namely hydropower energy storage technology, compressed air storage technology, and flywheel energy storage technology. Hydraulic energy storage technology is the oldest, most mature technology, and the largest commercialization technology of equipment capacity. There are about 500 hydraulic energy storage power stations in the world, of which 35 are more than 1000MW. The hydraulic energy storage system generally has two large reservoirs, one is in a lower position, and the other is located in a higher increase. During the low peak period of electricity, the water was delivered from a lower place to a reservoir with a lower position to the storage reservoir to store it. When electrical energy is needed, the potential energy of the high -level reservoir can promote the power generation of water energy machines.

Compressed air storage is to transport air pressure to underground salt mines, abandoned stone mines, underground water storage layers, etc. during the low peak period of electricity. When the electric load is large, the compressed air can burn with the fuel, generating high temperature and high voltage gas, and driving the gas turbine to do power. The equipment capacity of the application has reached hundreds of MW. Such as the installation capacity of 290MW, Germany's Fenolph Power Station was put into use in 1980.

Flying Wheel Energy Storage Power Technology is a new type of technology that connects with the power network to realize the conversion of electrical energy. The flywheel energy storage power system is shown in Figure 1.12, and the system is mainly composed of equipment such as motors, flywheels, and electric electronics converters. The basic principle of flywheel energy storage is to convert the electric energy in the power system into the kinetic energy of the flywheel movement under the rich conditions of power. When the power system is insufficient, the kinetic energy of the flywheel movement is converted into electrical energy for power supply users. Compared with other energy storage technologies, the advantages of high efficiency (80%to 90%), low cost, low cost, pollution -free, rapid energy storage, and reliable technology have attracted the attention of Japan, the United States, and German researchers. For example, Japan's Okinawa Electric Power Corporation developed a 210MJ flywheel energy storage system; in 1996, Germany developed a superconducting magnetic suspension energy storage power station with an energy storage 5MW · H/100MW · H, with a system efficiency of 96%.