The application of energy storage in power systems is becoming increasingly widespread, with important roles and potential. The following are the main applications of energy storage in the power system：
1、Energy scheduling and peak valley filling：Energy storage systems can store electricity and release it when needed to balance the supply and demand differences in the power system. When electricity demand is low, energy storage systems can be charged to store cheap electricity; During peak electricity demand, the energy storage system can discharge to fill the power supply gap and smooth the power load curve.
2、Smooth output of renewable energy：Energy storage systems can address the intermittent and volatile issues of renewable energy. It can store excess electricity from renewable energy and release it when needed, smoothing the output of renewable energy and improving its reliability and predictability.
3、Microgrid support：Energy storage systems can be integrated with distributed energy resources such as solar photovoltaic and wind power, providing power storage and scheduling functions in microgrids. This provides higher independence, stability, and sustainability for microgrids.
4、Frequency and power regulation：Energy storage systems can adjust frequency and power through rapid response, helping the power system maintain stable voltage and frequency. It can provide or absorb electricity in a short period of time to cope with sudden load changes or power fluctuations, improving the reliability and stability of the power grid.
5、Capacity improvement of transmission lines：Energy storage systems can store electricity in transmission lines and release it when needed, helping to improve the capacity and efficiency of transmission lines. This can reduce the demand for new transmission lines, reduce the cost of grid expansion, and impact on the environment.
6、Backup and emergency power supply：The energy storage system can serve as a backup power source and emergency power supply system, ensuring the power supply of key facilities and users in the event of grid failure or power outage. It can quickly start and provide reliable emergency power in case of power interruption.
The application of energy storage in power systems not only provides flexible management and optimization of energy, but also enhances the reliability, stability, and sustainability of the power grid. With the continuous development of technology and the reduction of costs, the application prospects of energy storage systems are becoming broader.