With the development of new energy technologies and smart grids, energy storage equipment is of great significance in some distributed power generation systems based on clean energy (such as wind power generation, solar power generation, etc.). Due to the intermittent nature of wind power generation and solar power generation, its output electrical energy also has randomness and volatility, which increases the difficulty of controlling the operation of the power grid and has an impact on the power grid. In order to improve the utilization rate of clean energy connected to the power grid and ensure the reliability of its power supply, it is necessary to vigorously develop and study the energy storage technology in the distributed power generation system.
The main functions of energy storage equipment in distributed power generation systems are as follows:
(1) “Peak shaving and valley adjustment”, balance power. After the introduction of energy storage equipment in the distributed power generation system, the relationship between power generation and power consumption can be effectively balanced. For a distributed power generation system, its power generation changes dynamically. When the amount of electricity generated is greater than the total amount of electricity used by the load, the energy storage device will store the abundant electricity; when the power generation is less than the total load, the energy storage equipment will then provide the power that the system lacks to ensure the balance of supply and demand, while effectively ensuring the stable operation of the distributed power generation system.
(2) Improve the controllability of the distributed power generation system. The distributed power generation system is connected to the large power grid, and the energy storage system can adjust the energy balance between the distributed power generation system and the large power grid according to demand. The distributed power generation system, which is difficult to accurately predict and control, is integrated into a power source that can output electric energy within a certain range as planned, so that it becomes a dispatchable power generation unit in a large power grid like a conventional power source. In this way, the impact of distributed power grid connection on the large power grid is reduced, and the acceptance of the large power grid to the distributed power generation system is enhanced.
(3) Improve the power quality and the stability of the power generation system. Energy storage equipment can effectively improve the power quality of distributed power generation systems by suppressing power fluctuations and rapid energy storage and release. For example, in a wind power generation system, the change of wind speed will cause the generator output power to fluctuate and the quality of the power generation will be reduced. The use of energy storage devices is an effective measure to improve the output frequency and voltage quality of the generator. Combining distributed power generation units with energy storage equipment is one of the effective ways to solve dynamic power quality problems such as voltage drops, inrush currents, and instantaneous power supply interruptions.
(4) Act as a backup power source for the system. Energy storage equipment can also be used as a backup power source for the system. Due to the randomness and volatility of clean energy power supply such as wind power and solar power, when natural conditions change, such as weak wind or insufficient light, the power generation capacity of the system is small, and energy storage equipment is required as a backup power source to ensure the continuous power supply and stable operation of the system. For example, energy storage lithium ion battery ups backup, you can reserve energy for the home at night or when the power is out (learn more).
In summary, the application of energy storage equipment in a distributed power generation system can improve the stability of the system’s power supply, ensure the safety and reliability of the system, improve power quality and increase the utilization rate of clean energy access to the grid. It has important promotion significance for the development of distributed power generation system.