Hybrid energy storage technology into energy storage development direction
June 26, 2022
The 3rd Beijing International Energy Storage Conference 2013, which was held recently, revealed that current energy storage is an indispensable supporting technology for the development of smart grids, renewable energy access, distributed power supply, microgrid, and electric vehicles. It is a new energy source. One of the hot spots in the field of investment, unlimited business opportunities. However, it is difficult for a single energy storage technology to meet the performance indexes such as energy density, power density, energy storage efficiency, service life, and cost at the same time. Therefore, various energy storage technologies will coexist and develop in the future, and each has its own advantages.
Energy storage is a necessary component of smart grid
“At present, distributed power access is still relatively small, and the impact on the power grid is not yet obvious. However, with the large number of access to distributed power sources in the future, especially in local areas that will affect the safe and stable operation of the power grid, the The safe and stable operation of the power grid is likely to be 'abandoning the light'. Therefore, to increase the power generation efficiency of renewable energy, it is necessary to add energy storage systems to the power grid.” Liu Jialiang, vice president of XtremePower and general manager of Asia-Pacific region in the third session of 2013 The Beijing International Energy Storage Conference pointed out.
In fact, in recent years, China has conducted research on the combination of distributed energy and energy storage, such as the Zhangbei Wind Power Storage and Demonstration Project of the State Grid, the Weibei Weichang distributed generation/energy storage and microgrid project, and Mengdong Chenbaerhu. Flags distributed generation/energy storage and micro-grid, these projects not only pointed out the direction for the development of energy storage industry, but also provided an effective solution for the access of renewable energy such as wind power, solar power generation.
In addition to access to renewable energy sources and distributed power sources, energy storage is an indispensable support technology for the development of microgrids and electric vehicles. It is an essential part of the smart grid and penetrates into the power system, transmission, transmission, distribution, and distribution. With each link, not only can the difference between peaks and valleys be reduced, but also the adjustment of power generation capacity can be reduced. It can also increase the traditional power generation efficiency, reduce the fuel cost, reduce the accident rate, and improve the safety of the power grid.
Zhou Xiaoxin, an academician of the Chinese Academy of Sciences, said earlier: “At present, China’s third-generation power grid is under construction, with clean energy power accounting for a large share and intelligence as the main feature. The form of power generation will be a combination of large-scale centralized power generation and distributed power generation.” Therefore, the energy storage system in the power system will also be divided into large-scale centralized energy storage systems and large-scale distributed energy storage systems. That is, there will be no energy storage technology that can fully meet the smart grid acceptance of renewable energy. demand.
According to reports, energy storage technologies mainly include physical energy storage (such as pumped storage, compressed air energy storage, flywheel energy storage, etc.), chemical energy storage (such as various types of batteries, renewable fuel cells, flow batteries, super capacitors, etc.) And electromagnetic energy storage (such as superconductive magnetic energy storage, etc.) and so on. In recent years, as China's power grid operations are facing increasing power load, intermittent energy access share expansion, and limited peak load adjustment methods, these energy storage technologies have been developed to varying degrees, but due to the characteristics of these energy storage technologies Differently, their development trends, application prospects, and commercialization levels are also different.
Hybrid energy storage technology into the development direction
Among them, the flywheel energy storage and superconducting energy storage are suitable for occasions where large pulse power needs to be provided for a short time. Pumped energy storage and compressed air energy storage are suitable for system peaking, large-scale emergency power supply, renewable energy grid connection and other occasions. At the same time, only the pumped-storage technology is relatively mature in large-scale energy storage technologies, but it is constrained by the geographical environment and construction period; lead-acid battery technology is mature, but because lead is a heavy metal pollution source, it is not a future development trend; lithium-ion batteries With high costs, product performance is still unable to meet the energy storage requirements, and its economics cannot yet be commercialized.
Therefore, studies have shown that there is no general-purpose energy storage technology whose characteristics are superior to other technologies, and when there is no breakthrough in domestic energy storage technology, combining different energy storage media can achieve better results. Technical and economic performance.
For example, the State Grid Zhangbei Wind Power Storage Demonstration Project energy storage power station uses 14 megawatts of lithium iron phosphate batteries, 4 megawatts of sodium batteries, 2 megawatts of flow batteries, 95 megawatts of total capacity, and multiple types of energy storage systems. Coordinated application scale ranks first in the world. According to sources of the State Grid New Source Zhangjiakou Scenery Storage Demonstration Power Station Co., Ltd.: “The flow battery has good capacity expansion, long charge and discharge life, and many cycles; the sodium* battery is a high-temperature battery, high specific energy, and small footprint. How to cooperate with the scenery after the battery is used together, and how to operate together, all need to be explored."
In addition, the participating guests also stated that while increasing the research and development strength of energy storage technology, it is necessary to establish a standard system that is suitable for the development of China's energy storage industry, such as technical standards, safety standards, and access standards. Hua Ning, the chief representative of IEEE China, said: "We need to formulate relevant standards systems and seamlessly connect the energy storage system to the smart grid."
