Research And Application Of Collaborative Optimization Strategy Of Active Distribution Network Considering Flexible Load

With the massive access to new energy sources such as wind power and photovoltaics,the safe and stable operation of the power grid has been challenged.In order to suppress the negative impact of the inherent randomness and volatility of clean energy based on wind and photovoltaics on the operation of the distribution network,the active distribution network can affect the distributed energy sources such as energy storage systems,flexible loads and diesel generator sets Proactively manage to ensure the smooth operation of the distribution network system.However,using different optimization methods will greatly affect the operation results of the distribution network.Therefore,it is necessary to study a typical active distribution network collaborative optimization strategy that considers flexible loads to ensure the safe and economic operation of the distribution network.In view of the controllable resources of the active distribution network,this paper integrates the distributed power on the user side and establishes a mathematical model for the active distribution network.Afterwards,it analyzes the flexible load on the user side,introduces the classification and control model of the flexible load,and models the three common flexible loads respectively,laying the foundation for the research of the active distribution network collaborative optimization in the subsequent chapters.Aiming at the problem of active distribution network operation optimization,this paper proposes an active distribution network collaborative optimization strategy that considers flexible loads at multiple time scales.This strategy organically combines day-to-day optimization and day-to-day rolling optimization.In the day-to-day optimization model,the controllable units in the distribution network are optimized to ensure the economy and reliability of the system operation.In the day-to-day rolling optimization model,intermittent Energy output information and short-term forecast data of load power,adjust the energy storage system to correct the error between the previous optimization results and actual operation,and ensure that the active distribution network operates in an economic and safe mode.Finally,this paper designs a multi-power supply collaborative optimization simulation platform for active distribution network,builds a typical active distribution network topology with new energy and flexible loads in Dig SILENT,and designs a coordinated optimization control based on multi-power cooperative optimization strategy at multiple time scales Module and simulation operation module based on typical active distribution network.According to the needs of testers,the optimization goals,solution parameters and topological component parameters of the platform strategy can be adjusted,and the corresponding results can be obtained by solving the corresponding model through the built-in algorithm of the platform to provide an effective reference optimization solution for the optimal operation of the distribution network.