Difference between active distribution grid and traditional distribution grid, please

Active distribution grid is a system consisting of micro power sources, loads, energy storage systems and control devices

2. Traditional distribution grid is a passive distribution grid, whose operation, control and management modes are passive. Electricity produced by large power plants, flowing through the transmission network (high voltage), through the distribution network (MV and LV) to the user, so the low and medium voltage (LV) distribution network is the power system's "passive" load, so the distribution network can be called passive distribution network (PDN, passive distribution network). Therefore, distribution network can be called passive distribution network (PDN, passive distribution network). Even with the adoption of distribution automation, especially in China, the core control idea is still passive, i.e., in the absence of faults, the operation of automatic control is generally not carried out. Existing distribution network analysis calculations, whether for losses, voltage and reliability, are based on maximum load conditions or average load conditions. As a result, traditional distribution systems were not originally designed for accessing large amounts of distributed resources. The connection of a large number of distributed energy resources (DERs) to the distribution network may have a number of impacts. For example, it affects short circuit levels and equipment sizing, reactive power and voltage distribution, protection, distribution automation and fault clearing processes, and islanding operation in special cases. Therefore, in order to cope with the access of a large number of distributed DERs and still maintain the original reliability, there is a need to move towards active control and active management.