Low carbon planning of flexible distribution network considering orderly charging and discharging of EV

In the context of the "dual carbon" goal, the rapid growth of distributed new energy and electric vehicles (EV) has brought great challenges to the safe and economic operation of the distribution grid. In order to improve the economy and low carbon of distribution network planning, this paper proposes a low carbon planning method of flexible distribution network considering EV orderly charging and discharging. Firstly, a dynamic charging and discharging boundary aggregation model of EV cluster is constructed based on the EV individual power feasible domain model. Secondly, using the carbon emission flow theory as a tool, a two-layer low-carbon planning model of distribution network considering EV orderly charge and discharge is established. The upper layer plans the distribution network lines, two-way charging piles, and intelligent soft open point (SOP), while the lower layer optimizes EV charge and discharge strategy and user consumption strategy with the goal of minimum comprehensive operating cost. Then, the two-layer nonlinear model is transformed into a single-layer mixed- integer second-order cone programming model by means of upper-lower linkage, large M method and second- order cone relaxation, which is solved by commercial solvers. Finally, the feasibility and validity of the model are verified in the improved 33-node system.