Abstract:

In view of the low voltage problem of distribution network caused by the weak structure of rural power grid and long power supply radius,rationally configuring distributed energy storage has become a hot spot in current research.In order to solve the problems of capacity waste and excessive discharge depth in common calculation methods of energy storage capacity,this paper comprehensively considers the interaction between optimal configuration and operation control process,establishes a double-layer nested model for coupling calculation of energy storage system capacity configuration layer and operation control layer,takes the energy storage capacity of configuration layer as the constraint condition of system operation,and constructs a capacity correction link according to the energy storage output of control layer,and calculates the optimal capacity of energy storage system through alternate iteration.Finally,taking the actual operation data of a rural power grid as an example,the simulation analysis shows that the proposed method can effectively reduce the fixed energy storage capacity,reduce the initial investment cost,and improve the operation economy at the same time,which has strong practicability and popularization value.

Key words: distributed energy storage, low voltage distribution network, capacity configuration, control strategy