In the construction of the new energy microgrid, energy storage is not only a key link in the chain of “mining-generation-transmission-distribution-use-storage” of the power system, but also the cornerstone of the stable operation of the new energy microgrid. Facing the instability caused by intermittent energy generation such as wind power and photovoltaic, energy storage systems, with their unique advantages, play an irreplaceable role in the microgrid.
1. Improve the stability of distributed energy
Distributed energy sources such as solar energy, wind energy, etc., their power generation efficiency is deeply affected by external environmental factors, resulting in randomness and instability of the power generated.When the microgrid is running independently, this instability is particularly prominent, and it is difficult to ensure the stable power supply of the load.The introduction of the energy storage system, through the collaborative control of the energy management system (EMS), can stabilize the fluctuations of distributed energy and ensure the stable output of electrical energy.At the same time, the energy storage system can continue to provide power to the load during distributed energy maintenance or when power cannot be generated at night, effectively reducing power failure time and improving power supply reliability.
2. Improve the power quality of users
When the microgrid is connected to the main grid, its power quality must meet relevant national standards.However, microgrids without energy storage systems are susceptible to distributed energy characteristics, resulting in unstable power quality.The use of energy storage systems can significantly improve the power quality of microgrids.By precisely controlling the PCS in the energy storage system, the energy storage system can stabilize the output of electrical energy, adjust the active and reactive power, and solve problems such as voltage dips/drops.At the same time, when the voltage of the main grid fluctuates, the energy storage system can also provide fast power buffering, stabilize the voltage, and ensure the reliability and safety of users’ electricity consumption.
3. Realize power peak adjustment
The energy storage system can also play an important role in peak adjustment of electricity in the microgrid.At the trough of the load, the energy storage system can store excess electrical energy emitted by distributed energy sources; at the peak of the load, the electrical energy is released to meet the load demand.This energy buffering effect not only reduces the required capacity of the generator set or transformer, but also improves the energy utilization efficiency of the microgrid.Through the peak adjustment effect of the energy storage system, the microgrid can better adapt to load changes and ensure a stable supply of electricity.
In summary, energy storage plays multiple roles in the microgrid, such as improving the stability of distributed energy, improving the quality of users’ electricity consumption, and realizing peak adjustment of electricity.With the continuous development of new energy technologies, energy storage systems will play an increasingly important role in the construction of microgrids, contributing to the construction of a more stable, efficient and sustainable energy system.
