A Study on the Joint Operation Model of DGW Renewable Energy Base Based on HVDC Transmission System

Large-scale renewable energy bases in desert-gobi-wasteland (DGW) regions generally exhibit a high degree of operational independence while being required to maintain stable power delivery to external grids, which endows them with inherent advantages in joint operation. This paper proposes a joint operation model for DGW renewable energy bases supported by HVDC transmission systems. Under this model, all generation stations within the base jointly participate in market operations, and a mixed-integer programming (MIP) model is established to perform optimal dispatch, collectively fulfilling the power delivery obligations stipulated in the medium-and long-term contracts of the consortium. Based on the optimal dispatch results, a settlement mechanism for internal power exchange is designed in accordance with the principle of "whoever causes it, bears the cost,"so as to achieve a fair distribution of economic benefits among the participating stations. Finally, using one-week actual operational data from a DC-supported DGW renewable energy base in Northwest China as a case study, the optimal dispatch and settlement procedures are carried out for each station. The results verify that the proposed operation method can effectively ensure compliance with medium-and long-term contractual obligations while simultaneously accommodating the economic interests of individual generation stations.