Research On Hierarchical Optimal Scheduling Based On Flexible Resources On Both Sides Of Source And Load In Regional Power Grid

China is in the critical stage of energy structure transformation,and the increase of the proportion of renewable energy aggravates the demand for the flexible regulation capability of regional power grid.The risk of an insufficient flexibility adjustment capability occurs on both source and load sides of regional power grids with a high proportion of renewable energy.In this context,considering the coordination of multiple flexible resources,this dissertation proposes a hierarchical optimal scheduling strategy for multiple flexible resources on both sides of the source load from the establishment of the power flexibility adjustable margin model.The main work is as follows:(1)Chapter 2 studies the accurate modeling of pumped storage power station and determines its pump-turbine mode.According to the influence of weather factors on the water quantity of upper and lower reservoirs and considering the power generation principle of pumped storage power station,the power generation model of pumped storage power station is established.In order to reduce the peak load regulation pressure of traditional thermal power units caused by the fluctuation of renewable energy,the coordination of turbine state and pumped state of pumped storage power station provides flexibility margin of up-adjustment and down-adjustment for regional power grid.According to the distribution of load peak valley difference,the pumping strategy of pumped storage power station is determined.Finally,the data of a regional power grid in northwest of China is used for heating,and the proposed pump-turbine model and pumping strategy are applied to a regional power grid to verify its effect on improving the flexibility of the regional power grid.(2)Chapter 3 determines the flexibility transformation scheme and compensation mechanism of thermal power units.According to the peak load regulation cost curve of thermal power units,the peak load regulation costs under different transformation modes are compared,and the corresponding auxiliary service compensation mechanism is formulated for economic compensation.Finally,the proposed different transformation methods and their compensation mechanism methods are applied to the established regional power grid,and the operation costs of different transformation methods are compared to determine the most appropriate thermal power transformation method and compensation mechanism methods.(3)Chapter 4 and 5 propose a hierarchical optimal scheduling method considering the flexibility margin of regional power grid.Firstly,this dissertation studies the adjustment ability of electricity price and incentive demand response.Then according to the resource richness and difficulty,the priority of multiple flexible resources is divided.Finally,on this basis,a hierarchical optimal dispatching method of regional power grid considering flexibility margin is proposed,and the regulation effect of flexibility margin is evaluated according to the optimization indexes of flexibility resources,including load matching index,regional power grid operation economy index and regional power grid renewable energy consumption ability index.The simulation results show that the proposed hierarchical optimal scheduling method considering the flexibility margin of regional power grid can improve the flexibility margin of regional power grid,and improve the economy of power grid operation,as well as the renewable energy consumption capacity.