Power System

The application of batteries in the power system is mainly reflected in energy storage, peak shaving and frequency regulation, emergency backup, and new energy grid connection. The specific analysis is as follows:

1、 Energy storage and peak shaving frequency regulation
Battery energy storage systems (BESS) can effectively store electrical energy and release it during peak demand or insufficient power generation, achieving a spatiotemporal balance between electricity supply and demand. For example, lithium battery energy storage technology has become the core means of power peak shaving and frequency regulation due to its fast response speed and high charging and discharging efficiency. In the 100MW/120MWh project of the Australian Energy Market Operator (AEMO), the lithium battery energy storage system significantly alleviates the intermittency problem of renewable energy through rapid charging and discharging. In addition, when the energy storage system is combined with thermal power units for frequency regulation, the response time can be shortened from minutes to seconds, improving the stability of the power grid.

2、 Emergency backup and black start
The battery system can serve as an emergency power source for critical loads, ensuring power supply continuity in the event of grid failures or natural disasters. Its small size and mobility make it suitable for mobile emergency scenarios, such as the UPS power supply system saving investment and improving flexibility in parallel redundant power supply through a shared battery solution. At the same time, the battery energy storage system has black start capability, which can quickly restore power supply after the entire plant loses power, avoiding load power outages. For example, China Southern Power Grid has reduced power grid pressure and improved power quality through battery energy storage projects.

3、 New energy grid connection and consumption
The battery energy storage system uses a "peak shaving and valley filling" mechanism to stabilize the volatility of new energy generation such as wind power and photovoltaics. Store energy during low periods of new energy output and release it during peak periods, reducing reliance on conventional units for peak shaving. For example, the 100MW/400MWh project of Southern California Edison Company (SCE) in the United States improves grid efficiency through energy storage systems and mitigates frequency fluctuations caused by the integration of new energy sources. In addition, energy storage systems can improve the accuracy of new energy generation forecasting, smooth out minute level power fluctuations, and support a high proportion of new energy consumption.

4、 Microgrid and Distributed Energy
In microgrids, energy storage systems collaborate with distributed energy sources for stable output and improved on-site utilization. For example, achieving peak valley price arbitrage and reducing electricity costs through peak shaving and valley filling. At the same time, the energy storage system can regulate reactive power, solve voltage drop problems, and improve power quality. For example, China State Grid's 100MW/400MWh project enhances grid stability through energy storage systems and supports distributed energy access.