To address the problem that the independent dispatching method of traditional transmission network and active distribution network (ADN) leads to insufficient exploitation of resource synergy potential of each part of "source-network-load" and makes it difficult to achieve economic and efficient operation of transmission-distribution system

this paper proposes a transmission and distribution optimization scheduling method under the electricity market

which takes into account the distribution network reconfiguration and demand response. Firstly

the coupling mechanism between transmission and distribution networks under the power market mechanism is analyzed

and a transmission grid market clearing model considering the unit commitment is established

so as to bring into play the ability of the "source side" to cope with the fluctuation of power load. By using the locational marginal price as a guiding signal

a transmission and distribution cooperative two-layer optimization model considering both ADN network reconfiguration and demand-side response is proposed. The objective is to explore the synergy potential of ADN on the "network side" and "load side"

so as to improve the synergy capability among the resources of "source-net-load" in the transmission-distribution network. Secondly

the stochastic programming L-shaped algorithm is used to decouple the transmission-distribution synergy model by introducing dummy variables in the upper transmission network. In the lower distribution network

a set of pairwise multipliers reflecting the resource utilization is obtained based on the pairwise theory. By calculating the sub-gradient coefficients and generating the affine cut set

the transmission-distribution coupling variables are optimized to accelerate the convergence of the model and realize the distributed and efficient solution of the transmission-distribution synergy model. The model is efficiently solved in a distributed manner. Finally

the T6+D7 system consisting of a 6-node transmission network and a 7-node distribution network and T118+8*D20 system consisting of a 118-node transmission network and eight 20-node distribution networks are used as examples to verify the effectiveness of the proposed model and method. The research results indicate that the overall economic efficiency of the transmission and distribution system has increased by 8.68%

and the proposed model and method have significant advantages.