Research On Optimal Dispatching Of Active Distribution Network Considering "Source-Load-Storage" Collaborative Interaction

With the construction of smart grid and the development of clean energy,the load types in distribution network are diversified.With the increase of resources such as distributed generations,controllable loads and energy storages,the traditional distribution network with one-way power flow is gradually transforming into the active distribution network with two-way power flow.With the change of energy structure,the randomness and volatility of clean energy bring peak load regulation greater pressure,the safe and stable operation of power system is facing enormous challenges.Comprehensive utilization of active load resources in distribution network to participate in optimal dispatching is of great significance to improve power supply reliability and promote the development of clean energy.In this paper,an optimal dispatching model considering all kinds of generation resources in active distribution network is proposed,which can reduce the dispatching pressure of distribution network,improve energy efficiency and increase clean energy consumption.The feasibility of the model is verified by typical examples.Firstly,the architecture and key technologies of active distribution network are introduced,demand side load resources and energy storage equipment in active distribution network are studied and analyzed.Based on the response strategies,constraints and costs of controllable load and energy storage resources,a response model is established,and a two-stage optimal dispatching strategy of "source-load-storage”collaborative interaction is proposed.Secondly,an optimal dispatching model of active distribution network is established,which takes the reliability and economy of distribution network as the objective function,and takes into account the constraints of network balance,distributed generation power,user satisfaction and charging and discharging power of energy storage system.On the basis of particle swarm optimization,the ideal point method is used to solve the multi-objective optimization problem.Finally,the feasibility and correctness of the optimal scheduling model and algorithm are verified by an example of the IEEE-33 bus system.By comparing and analyzing the optimization results with single control strategy:"source-load" cooperative response and "source-storage" cooperative response,the control strategy considering "source-load-storage" cooperative response can make full use of all kinds of resources in distribution network,and the optimal effect is the best.The frequent switching of charging and discharging in the energy storage system which participates in the optimal dispatch increases the cost of energy storage resource invocation.A dual energy storage operation strategy is proposed.On the premise of the same output as the original energy storage system,the cycle number of charging and discharging in the energy storage system can be greatly reduced,the service life of the system can be prolonged,and the economy of the optimal dispatch in the distribution network can be effectively improved.