Capacity calculation method of energy storage system based on flexibility index of photovoltaic, energy storage, direct current and flexibility (PEDF) system in buildings

The photovoltaic, energy storage, direct current and flexibility (PEDF) system in buildings is an important technical means to help the building field achieve carbon peaking and carbon neutrality, in which energy storage forms are mostly energy storage batteries. Based on the flexible index requirements of the standards, a calculation method of battery capacity is presented and a practical project in Shenzhen is chosen as a case study in this paper. The total direct current load power of the project is 762.65 kW, and the required energy storage capacity is calculated to be 470 kWh. In the process of flexible adjustment, the charging pile system contributes the most, about 56.09%, while the lighting system contributes the least, only 5.13%.