Abstract: In order to improve the absorption capacity of clean energy and make full use of the peak regulation

resources of each province，the peak regulation capacity of different types of power sources was studied，and a

regional power grid optimization dispatching method considering the mutual aid of peak regulation resources was

proposed. Different types of power supply have different peak-regulating capacities. Based on the economic

difference of peak-regulating capacity of coal-fired power units，three evaluation indexes were proposed，namely

basic peak-regulating capacity，non-fuel peak-regulating capacity and fuel peak-regulating capacity，to quantify the system peak-regulating capacity of provincial power grid under different economic zones. Considering the difference of peak dispatching resources between provinces，an optimal dispatching method of regional power grid based on twolayer architecture was constructed. The superstructure was used to optimize the power delivery and reception plans of each provincial power grid within the regional power grid，while the lower structure optimized the generation plan based on the given power transmission plan and determined the peak load adjustment plan of coal-fired units. The optimization dispatching problem of regional power grid was solved by iteration between two layers architecture. A case study was constructed based on the IEEE RTS-96 three-region buses system to verify the feasibility of the proposed method. The results show that this method can directly quantify the peak shifting capacity of each province and region，and realize the mutual aid of peak shifting resources across regions through economic evaluation indexes，which is helpful to improve the clean energy consumption capacity of regional power grid.

      Key words: regional power grid；optimization dispatch；peak-regulating resource；peak regulating capacity；

two-layer architecture