Optimal Dispatch for Cross-region DC Interconnected Electric-gas Coupled Integrated Energy System Based on ADMM Algorithm

Under the background of energy Internet, the coupling relationship and joint optimization between power system and natural gas system are paid more and more attention. In this paper, an electrically-coupled integrated energy system considering cross-region dc interconnection is established. Firstly, the refined modeling of power grid and natural gas network is carried out in the region. Based on the equivalent generator model, the direct current (DC) tie-line model is established. Then, ADMM algorithm is used to establish a completely distributed scheduling model. Finally, the IEEERTS79 system and Belgian 20 natural gas network are used for simulation. Through the bidirectional flow of energy in the power-gas system, the generation cost and wind abandoning rate of the interconnected integrated energy system are reduced. At the same time, the wind abandoning condition can be further improved by increasing the reactive power compensation capacity provided for the power-gas interconnection equipment while ensuring the voltage stability of the system.