A Multi-objective Planning Method Based on Transmission and Distribution Coordination Considering Economy and Green

Abstract

In new power system with new energy as the main body, economy and green requirements are essential, while the coupling degree of transmission and distribution networks is increasing, the traditional independent and split planning methods are difficult to achieve global optimization. In order to meet economy and green, a multi-objective planning method based on transmission and distribution coordination is proposed. The model objectives are to minimize the total cost of investment and operation, to minimize the curtailment rate of new energy, and to minimize the carbon emission of transmission and distribution networks. AC power flow is used to account for node power balance, unit output and ramp-up constraints, N-1 constraint and so on under temporal scenarios. The decomposition optimization modeling idea is adopted so as to decompose the model into a transmission network planning sub-problem and multiple distribution network planning sub-problems. The model is solved effectively by NSGA-III embedded with ATC algorithm. Finally, the optimal solution set and the optimal compromise result are given by case study, which verifies the equilibrium and effectiveness of the method.