The distributed energy storage system (DES) technology is an important part of the solution. The DES can help building owners and energy consumers reduce costs and ensures reliability and additional revenue through on-site generation and dynamic load management.
Through planning and deployment, with its excellent system resilience and efficiency, the distributed energy storage systems can also achieve the unification of economic, social and environmental benefits, decrease grid costs, reduce greenhouse gas emissions, and extend power supply.
The development of today’s society is more and more dependent on the utility of digital information technology, and the connection with the supply chain is also more and more closely. Climate change is threatening the world, and the benefits brought by the distributed energy storage system are related to the vital interests of everyone.
Ⅰ. The applications of the distributed energy storage
According to different access methods and application scenarios, the applications of distributed energy storage systems mainly include centralized and distributed forms. The energy storage system of centralized application is generally centrally connected at the same grid connection point. At present, this form is mainly used in the integration of large-scale renewable energy power generation and grid auxiliary services. It has the characteristics of high power EV charging (several megawatts to hundreds of megawatts) and long continuous discharge time (minutes to hours). The energy storage system for distributed applications has flexible access locations. Currently, it is mostly used in medium and low voltage distribution networks, distributed generation, microgrids, and user-side applications. The scale of power and capacity of the distributed energy storage is relatively small.
Ⅱ. The prospects and key technologies of distributed energy storage systems
With the continuous improvement of the energy storage system, especially the battery energy storage technology and economy, the promotion and application of the distributed energy storage system will surely be promoted. The current technical reserves cannot support the application of a large number of the distributed energy storage systems connected to the power grid, and there is still a great research demand for the application of the distributed energy storage systems in the power grid.
1. The research on the distributed energy storage to improve distributed wind-solar renewable energy grid-connected consumption technology
Starting from the demand for power quality improvement and peak shaving of the distribution network caused by distributed wind and solar power generation. Carrying out research on the distributed energy storage capacity configuration, economic analysis and control technology. Through the combination of the two, the operation level of the distribution network will be improved.
2. The research on unified dispatch management technology of the distributed energy storage system in power grid
When the number of the distributed energy storage systems connected to the power grid reaches a certain scale, the distributed energy storage system should be dispatched and managed in an orderly manner, so that it can not only satisfy local functions, but also meets grid-level applications through unified coordinated control, and maximizes the role of the distributed energy storage systems.
3. The research on optimal configuration and economic analysis technology of distributed application of energy storage system
At present, the optimal configuration of the distributed energy storage is mostly optimized configuration of power and capacity for specific access points. In the future, when making a unified arrangement from the perspective of the power grid, the research on the orderly planning and configuration of the distributed energy storage systems should be carried out to give full play to the aggregation effect of multipoint distributed energy storage, to achieve the ability to support various needs of the power grid, and to generate certain economic and social benefits.
The application of the distributed energy storage technology in distribution network, user side, micro grid, distributed power generation, etc. can produce significant economic and social benefits, and the application potential is huge.