A hybrid energy storage system is a combination of two or more energy storage technologies with different performance characteristics to improve the overall performance of the energy storage system, so as to meet the detailed needs of different scenarios and users. Due to the huge application potential of hybrid energy storage system, China has gradually begun to carry out the project application of hybrid energy storage.
Compared with the single energy storage technology, the hybrid energy storage technology combines a variety of different energy storage methods, comprehensively utilizes the advantages of multiple technologies, makes up for the shortcomings of the single energy storage technology, and also overcomes the problems of low operating efficiency of the energy storage system. At the same time, the hybrid energy storage technology is more flexible and intelligent, through new technologies such as computers and the Internet of Things, it can coordinate and control various energy storage devices in the energy storage system, so that the energy storage efficiency of the whole system can be maximized, and at the same time, the dynamic adjustment and optimal scheduling of the power supply network can be realized, and the operation stability and power supply quality of the microgrid can be enhanced. As a result, hybrid energy storage technology offers the following advantages:
Extend the life of the battery:The service life of the battery in the hybrid energy storage system is 1 more time longer than that in the electrochemical energy storage system5-2 times.
Improve the reliability and safety of energy storage systemsThe reduction of the number of battery system uses and the charge-discharge rate in the hybrid energy storage system can greatly improve the safety and reliability of the system.
Reducing the cost of energy storage systems:Hybrid energy storage helps reduce system costs, as two or more energy storage systems can share most of the same power electronics and grid connection hardware, reducing initial installation and maintenance costs.
ImproveThe economics of the energy storage system during its operationIn the long term, off-grid energy storage systems are expected to reduce energy costs in remote areas, making them more economically viable. The hybrid energy storage system has a long service life, and the operation period is generally considered to be 10 years. The initial investment of hybrid energy storage system is slightly higher than that of pure electrochemical energy storage system, but considering the replacement cost of energy storage equipment during the operation period, the total cost of hybrid energy storage system is lower than that of pure electrochemical energy storage system during the 10-year total operation period.
Therefore, hybrid energy storage has good development prospects and performance advantages, but it still faces some technical difficulties and economic bottlenecks in the development process. Therefore, it is necessary to analyze the specific problems and find the real suitable solutions when applying.