Aiming at the problems of photovoltaic power reverse and transformer overload operation caused by the difference of source and load characteristics in distribution station areas under independent operation mode, a flexible interconnection planning method for distribution station area of regional distribution network is proposed. Firstly, the VSC-based flexible interconnection topology and operation mode are analyzed, and its power flow model is established. Secondly, according to the operation characteristics of distribution station area, the interconnection demand index is put forward, and on this basis, the distribution station area connectivity analysis method of regional distribution network is proposed. Then, taking the whole regional distribution network as research object, a bilevel planning model of the flexible interconnection scheme and interconnection device configuration is established. The upper level model solves the optimal planning scheme, and the lower level model realizes the economic system operation. The model is solved by a hybrid optimization algorithm based on simulated annealing and cone programming. Finally, the proposed planning model is verified on a 40-node example. The comparative analysis of distribution system cost, photovoltaic absorption rate and transformer load rate before and after planning verifies the effectiveness of this model in improving the economy and operation efficiency of regional distribution network.