Abstract
Abstract Power generated by large-scale wind farms in northwest China needs to be remotely delivered by ultra-high voltage lines (UHVs) before consumption. However, fluctuation and intermittency of wind power output results in high costs and low efficiency of transmission. This study proposes a novel optimal model and practical suggestions to design an energy storage involved system for remotely delivering of wind power. Based on a concept model of wind-thermal-storage-transmission (WTST) system, an optimization model is established to determine optimal configurations of the system. As validated by a case study, the model is capable of determining installed capacities of wind power plants, thermal power plants, pumped hydro storage stations, and maximum transmission capability of UHVs; and it can be fast solved by mixed integer programming. According to the results of case simulation, the best configuration can significantly reduce wind curtailment rate and improve operational efficiencies of UHVs by load shifting before and after power transmission. Specifically, improving energy storage capacity and remolding thermal power plants to be flexible ones are feasible ways to realize the objectives, which are vital to increase the penetration rate of wind power in China.
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