Improving the stability of distributed energy: Distributed energy sources such as solar and wind power are greatly affected by the external environment, and their power generation has randomness and instability. The energy storage system, through the Energy Management System (EMS), coordinates and controls distributed energy with the energy storage system and the main power grid. It can stabilize the fluctuation and output of distributed energy, improve the on-site utilization of distributed energy, and avoid transmission pressure and power loss caused by long-distance transmission to the main power grid.
Improving the power quality of users' electricity consumption: When microgrids are connected to the main grid for grid operation, their power quality must comply with relevant national standards. The application of energy storage systems can play an important role in improving the power quality of microgrids. The system controls the PCS in the energy storage system to regulate the active and reactive power output from the energy storage system to the microgrid while stabilizing the power output, solving the problem of voltage sag/drop. When facing problems such as sudden voltage surges or drops in the main power grid, energy storage systems can provide fast power buffering, quickly absorb/supplement electrical energy, provide active and reactive power support, and stabilize voltage fluctuations.
Peak shaving and valley filling: Energy storage systems can store unused electrical energy in microgrids and release it when needed, thereby achieving peak shaving and valley filling functions, reducing grid load pressure, and increasing grid capacity.
Voltage and frequency stabilization: In microgrids, voltage or frequency fluctuations may occur due to factors such as power instability or load fluctuations. Energy storage systems can stabilize the voltage and frequency of the grid through charge and discharge control to maintain grid stability.
Emergency backup: In microgrids, energy storage systems can serve as emergency backup power sources to ensure power supply in extreme situations such as sudden power outages and natural disasters.
Improving energy efficiency: By adding energy storage systems in microgrids for energy storage and release, energy utilization efficiency can be improved to a certain extent and energy waste can be reduced.
Enhancing the stability and reliability of microgrids: Microgrid energy storage systems can effectively address the volatility and uncertainty of renewable energy, offset the differences between peak and off peak load demand periods, regulate the voltage and frequency within microgrids, thereby ensuring the stability and reliability of microgrids.
Improving the efficiency of renewable energy utilization: Microgrid energy storage systems can store excess energy and release it when needed, fully utilizing renewable energy and improving the energy utilization efficiency within microgrids.
Optimizing energy management: Microgrid energy storage systems can achieve regular storage and release of electrical energy, and combine with other technologies to achieve precise management and control of energy demand.
Ensuring the sustainability of power supply: Microgrid energy storage systems can provide independent power reserves for microgrids, ensuring the electricity needs of microgrid users in the event of power network failures or disasters, thereby improving the sustainability of power supply.
In summary, energy storage systems play a very important role in microgrids, and are of great significance in improving the operational efficiency, reliability, and economy of microgrids. With the continuous development and maturity of energy storage technology, the role of energy storage systems in microgrids will become increasingly important.
Selection of energy storage system:
Selection of energy storage equipment: The core part of a microgrid energy storage system is the equipment that stores energy, mainly including batteries, supercapacitors, fuel cells, hydrogen energy storage devices, etc. These devices can store excess renewable energy for future use. Among them, batteries are the most common energy storage devices, such as lead-acid batteries, lithium-ion batteries, sodium ion batteries, etc.
Selection of energy conversion equipment: Energy conversion equipment mainly includes rectifiers and inverters. Rectifiers are used to convert alternating current into direct current, while inverters are used to convert direct current into alternating current. These devices are crucial for connecting energy storage devices with other parts of the microgrid.
Selection of monitoring and protection equipment: Monitoring and protection equipment is used to monitor the operating status of energy storage systems and take protective measures when necessary. These devices include voltage sensors, current sensors, temperature sensors, etc.
Selection of communication system: The communication system is the link between various subsystems in the microgrid, which can realize data transmission and control between the energy storage system and other microgrid subsystems. Through the communication system, remote monitoring and real-time data sharing of microgrids can be achieved, improving the operational efficiency and stability of microgrids.
Selection of scheduling control software: Scheduling control software is the brain of microgrid energy storage systems, responsible for coordinating the work of energy storage devices and other subsystems. The software should have functions such as real-time monitoring, data analysis, and decision-making.
When choosing an energy storage system, it is necessary to comprehensively consider the above factors and make the selection based on specific usage scenarios and technical solutions