Adjustable Value Evaluation And Aggregation Analysis Of Distribution Network Load

With a high proportion of renewable energy connected to the power grid,the power uncertainty between the power generation side and the demand side is intensified,and the demand for flexibility in power system dispatching surges.It is difficult to support the regulation demand of the power grid by using the power generation side alone to deal with load changes.In this paper,the adjustable capacity of the load is used to improve the flexibility of the grid operation,and the adjustable value of the load is analyzed from the perspectives of demand response(DR)and reserve,so as to promote the consumption of new energy;Aggregation reduces the overall control cost of the system and improves the reliability and economy of grid operation.The main research contents include:(1)Evaluation and analysis of adjustable load DR value based on source-load similarityIn order to quantitatively evaluate the DR effect and value of the load,the new energy output is set as the "baseline" for evaluating the DR effect of the load,and an improved dynamic time warping(Median Dynamic Time Warping,M-DTW)index is proposed to describe the load and the similarity of new energy output.Through comparative analysis,it is verified that load participation in DR based on this index can more effectively absorb new energy output.On this basis,the M-DTW index is used to reflect the static and dynamic value of the user load curve,and the load DR regulation based on the user curve value provides an incentive optimization path for load participation in DR,which not only promotes new energy consumption,but also saves DR incentive costs.(2)Evaluation and analysis of the value of adjustable load participating in operational reservePower system reserve capacity refers to preventive measures that can ensure the normal operation of the system even in the event of equipment maintenance,accidents,frequency regulation,etc.This chapter uses the demand-side adjustable load to provide operating reserve for the power system.Taking the agricultural irrigation load as an example,first,the technical characteristics of the agricultural irrigation load are analyzed in combination with the agricultural irrigation demand,and the reserve capacity of the agricultural irrigation load is analyzed by using the power boundary to obtain the evaluation method of the reserve capacity of the agricultural irrigation load.The optimization model with the goal of minimizing the operating cost of the pump gives a variety of irrigation strategies for agricultural irrigation load;finally,the simulation analysis of the standby capacity of a single agricultural irrigation load under different irrigation strategies is carried out,and the scheduling of the agricultural irrigation load standby capacity is realized observability.(3)DR and reserve aggregate value analysis of load clustersThe DR value and reserve value of the load reflect the ability of the individual adjustable load to complement the operation of new energy sources and improve the flexibility of grid operation from different aspects.In this chapter,from the perspective of load cluster aggregation,the agent work mode of load is proposed.Then,in the DR aggregation of adjustable load,a load cluster aggregation method based on the average growth rate of time series is proposed.The simulation analysis of the change of agricultural irrigation load and regulation cost proves the aggregation value of the load cluster.After that,the reserve ability of the load agent to aggregate the agricultural irrigation load cluster is analyzed,and the optimization analysis is carried out by constructing the goal of maximizing the income of the agricultural irrigation load agent.It shows that the load agent achieves a win-win situation for multiple market participants by effectively aggregating load clusters.