The purpose of pumped hydroelectric storage is to use water as an energy storage medium to realize the storage and management of electric energy through the mutual conversion of electrical energy and potential energy. Use electric power during low power load to pump water to the upper tank, then release water to the lower tank to generate electricity during peak load period.
It can convert excess electrical energy when the grid load is low into high-value electrical energy during peak grid periods. It is suitable for frequency modulation and phase modulation, stabilizing the frequency and voltage of the power system, and can also improve the efficiency of thermal and nuclear power plants in the system.
Pumped storage power plantPrinciple of foperation:
The pumped storage power plant pumps water from low places to high places Hydroelectric plants are used to store energy and produce electricity when the electrical system needs it. It can convert excess electric energy into water potential energy when the grid load is low, store it, and convert the water potential energy into electric energy when the grid load is low. The load is maximum, realizing the efficient use of electrical energy storage.
Energy storage technology is mainly divided into electric energy storage, hydrogen energy storage and thermal energy storage< /p>
According to the National Energy Administration Definition, energy storage refers to the process of storing energy through equipment or equipment and releasing it in cyou need it. According to the different forms of energy storage, energy storage can be divided into electric energy storage, hydrogen energy storage and thermal energy storage. Currently, it is mainly electrical energy storage. Electrical energy storage can be divided into electrochemical energy storage and mechanical energy storage. Electrochemical energy storage is mainly the battery energy storage we are familiar with, including lithium batteries, lead-acid batteries, sodium-sulfur batteries, etc. Mechanical energy storage mainly includes pumped water energy storage, compressed air energy storage, flywheel energy storage, etc.
The cumulative installed capacity of China's energy storage market will reach 43.44 GW in 2021
According to the "2022 Storage Application Branch" released by the Energy Storage Branchapplications of China Chemical and Physical Power Industry Association The statistics of "Energy Industry Application Research Report" show that the newly installed energy storage capacity in China in 2021 will be 7,397.9 MW and the cumulative installed capacity reached 43.44 GW.
In 2021, pumped hydropower storage will account for more than 86% of the cumulative installed capacity in China's energy storage market
Among the electrical energy storage systems, pumped Hydroelectric storage is more traditional energy storage methods, while electrochemical energy storage and other new energy storage methods. Looking at the structure of China's energy storage market in 2021, the cumulative installed capacity of pumped energy storage will reach 37.57 GW, accounting for more than 86%, while the installed capacity cumulated electrochemical energy storage will reach 5.12 GW, or 11.8%. . In electrochemical energy storage, lithium-ion batteries represent 91%.
In 2021, the cumulative installed capacity of China's new energy storage market will exceed 5,700 MW
According to the Special Committee on Energy Storage energy from China Energy Research Association and Zhongguancun Energy Storage Industry Technology Alliance (CNESA) Incomplete statistics show that the cumulative installed capacity of China's new energy storage market will reach 5,729.7 MW in 2021, an increase of 74.5% compared to 2020.
Pumped hydropower storage will still account for the majority of new installed energy storage capacity projects in China in 2021< /strong>
The new installed capacity of energy storage in China in 2021 will be Among them, the installed capacity of energy storage projectsThe pumped hydroelectric power is 5,262.0 MW, or 71.1%, and the installed electrochemical energy storage capacity is 1,844.6 MW, or 24.9%. Among the new electrochemical energy storage projects in China in 2021, the installed capacity of lithium-ion battery energy storage technology will be 1,830.9 MW, accounting for 99.3%.
In summary, China's energy storage industry has developed rapidly in recent years, with newly installed capacity reaching 7.4 GW in 2021 and the cumulative total reaching 43.44 GW. Pumped hydroelectric energy storage is the primary form of energy storage. The cumulative installed capacity of electrochemical energy storage will account for 11.8% in 2021, of which lithium-ion batteries account for the vast majority.
——The above data refers to the “Market Forecast and Investment Forecast Analysis Report of China Industryenergy storage in China" from Qianzhan Industrial Research Institute"