With the wide application of renewable energy, new energy such as wind energy and solar energy has been paid attention to because of its clean, environmental protection and abundant resources. However, the power generation of these energy sources has obvious intermittence and instability, which brings challenges to the stable operation of the power system. As an efficient and responsive energy storage technology, lithium battery energy storage system can effectively act as a buffer between various power sources and stable power demand, improving the power generation capacity of less than regulated power supply, ensure the safety and stability of the power grid. This paper will discuss in detail the buffering effect of lithium battery energy storage system in power system and its promotion effect on the power generation capacity of wind energy, solar energy and other non-regulated power supply.

I. Intermittent and instability of wind energy and solar energy

wind energy and solar energy, as typical renewable energy sources, have great potential, but their power generation characteristics are unstable:

1. wind energy volatility
   wind speed is affected by weather, terrain and other factors, and the output power of wind power changes sharply with wind speed, with large fluctuations.

2. Time limit of solar energy
   solar power generation depends on Sunshine. Day and night changes and cloudy weather will lead to unstable power generation and failure to generate electricity at night.

3. Impact on power grid
   this instability makes the grid load difficult to predict, and it is easy to cause voltage fluctuation and frequency.Deviation and other problems affect the safe and stable operation of the power system.

Therefore, how to buffer and adjust these fluctuations and balance the relationship between supply and demand is the key to realize a high proportion of renewable energy access.

II. Buffer function of lithium battery energy storage system

lithium battery energy storage system can efficiently store and release electric energy. Its advantages such as fast response and high energy density make it an ideal buffer to connect various electric energy sources and electric power demand.

1. Energy storage and release
   lithium batteries can store the surplus electric energy of wind energy and solar energy during the peak period of power generation, release it when power generation is insufficient, and realize the time transfer and smooth output of electricity.

2. Stabilizing power fluctuation
   by adjusting the charging and discharging power in real time, lithium batteries can effectively cut peaks and fill valleys, slow down the fluctuation of wind energy and solar power generation output, and keep the power of the grid stable.

3. Fast response capability
   the lithium battery energy storage system has a short response time, can complete power adjustment in milliseconds, quickly respond to the change of power grid load and power fluctuation, and ensure the stability of power grid frequency and voltage.

4. improve power grid regulation capability
   as a distributed energy storage unit, lithium battery can participate in auxiliary services of power grid, such as frequency regulation and reactive power compensation, so as to enhance the flexibility and reliability of power grid.

III. Specific functions of improving wind energy and solar power generation capacity

lithium battery energy storage system not only buffers the fluctuation of wind energy and solar energy, but also significantly improves its electric energy and utilization efficiency.

1. Increase grid-connected capacity
   due to the fluctuation of wind energy and solar power generation, the grid has restrictions on its grid-connected capacity. Lithium battery energy storage system can balance the output power, reduce the impact on the power grid, and allow a higher proportion of renewable energy to be connected.

2. Extend power generation time
   using the energy storage system, excess solar energy can be stored during the day and released at night to realize all-weather power supply and improve the utilization rate of solar power generation.

3. Reduce the phenomenon of abandoning wind and light
   when the power load is low, wind and wind power generation often abandon the wind and light. The energy storage system can absorb excess electric energy, reduce energy waste and improve the economic benefits of wind power generation.

4. Optimized power generation structurethe energy storage system can reasonably adjust the output of wind energy and solar power generation according to the demand of the power grid, realize the coordination and cooperation of multiple energy sources, and improve the overall power generation efficiency.

IV. Technical advantages of lithium battery energy storage system

when the lithium battery energy storage system is used as a buffer, it has many technical advantages, making it an ideal supporting equipment for wind energy, solar energy and other regulated power supply.

1. High energy density and power density
   lithium battery is small in size and light in weight, and can provide high power output to meet the demand of rapid adjustment of power grid.

2. High efficiency
   lithium battery has high charge and discharge efficiency, which can reach more than 90%, reducing energy loss and improving energy storage utilization rate.

3. Long cycle life
   modern lithium batteries have a long cycle life, support frequent charging and discharging, and adapt to the changeable characteristics of wind and solar power generation.

4. Modular design
   lithium battery system can be flexibly expanded according to demand, which is convenient to be used together with wind energy and solar power generation systems of different scales.

5. <span style="font-size: 14px;"> intelligent management system
   equipped with advanced battery management system (BMS), it can realize real-time monitoring and optimal control of battery status to ensure safe and stable operation.

V. Application case analysis

in practical application, lithium battery energy storage system has been widely used in wind power and photovoltaic power generation projects to play a buffering role.

1. Photovoltaic power generation energy storage system
   some photovoltaic power stations are equipped with lithium battery energy storage devices to store abundant solar energy during the day and release it at night or on cloudy days to realize continuous and stable power supply.

2. Wind farm supporting energy storage
   wind farms use lithium battery energy storage to smooth the power generation fluctuation caused by wind speed changes, reduce the impact on the power grid, and improve the grid connection and absorption capacity of wind power.

3. Distributed energy storage and Microgrid
   in distributed energy and microgrid, lithium battery energy storage combines wind energy and solar energy to achieve self-sufficiency and grid interaction, improving energy utilization and power supply reliability.

lithium battery energy storage system Operation Management

in order to give full play to the buffer function of lithium battery energy storage system, it is necessary to reasonably plan its operation strategy and management mode.

1. Charge and discharge strategy
   according to the power grid load and wind-solar power generation conditions, the charging and discharging power is dynamically adjusted to realize power smoothing and load matching.

2. Condition monitoring and maintenance
   monitor the battery status in real time, optimize the charging and discharging process, prevent overcharge, overdischarge and overheating, and prolong the service life of the system.

3. Collaboration with power grid
   the energy storage system cooperates with the power grid dispatching center through intelligent control to participate in load management and auxiliary services to improve the overall power grid operation efficiency.

4. Economic benefit optimization
   combined with electricity price fluctuation and demand response, reasonable arrangement of energy storage operation can reduce electricity consumption costs and improve economic benefits.

As a buffer between various power sources and stable power demand, lithium battery energy storage system gives full play to itThe advantages of volume storage and fast response effectively alleviate the fluctuation problems of less than regulated power supply such as wind energy and solar energy. By stabilizing power fluctuations, improving grid-connected capacity, extending power generation time and reducing energy waste, lithium battery energy storage system significantly improves the power generation capacity and utilization efficiency of renewable energy.