Operation Optimization Analysis Of Active Distribution Network Based On "Source-Network-Load-Storage" Coordination

With the construction of smart power grid,the development and utilization of renewable energy and the increase of controllable resources in the power distribution network,the traditional one-way passive distribution network is gradually transformed into the active distribution network(ADN)with two-way interaction and multicoordination.At the same time,the randomness and volatility in the renewable energy itself brought many challenges to the safe and stable operation of power distribution network,and the active power distribution network with the help of the “sourcenetwork-load-storage” coordination optimization technology can give full play to the regulation of various controllable resources,realize the active guidance and the use of distributed generation,economy and stability of the system is increased.Therefore,it is significant to realize the coordinated control and active management of various controllable resources in ADN to realize the optimal allocation of resources and improve the economy and reliability of power distribution network operation.According to the main characteristics of active distribution network,controllable resources in ADN can be divided into four categories: distributed generation,network structure,controllable load(demand response)and energy storage system.Based on the analysis of the characteristics of various controllable resources in the active distribution network,this paper uses the complementarity of wind power and solar power in time and space and the optimization of the network reconfiguration to optimize the structure of the distribution network to establish a dynamic network reconfiguration model of the distribution network with multiple renewable distributed generation.The flexible and variable network structure of the distribution network is used as the optimization variable to carry out dynamic network reconstruction of the active distribution network,the optimization model is established with the minimum network loss cost and switching cost as the objective function,and the second-order cone relaxation technology and linearization method are used to the optimization model is transformed into a mixed-integer second-order cone programming model with convex feasible region.Finally,the simulation is carried out on the power distribution system of IEEE33 nodes.Through the dynamic network reconstruction of the distribution network,the effect of network reconstruction on the voltage drop loss of the active distribution network is compared and analyzed,and the accuracy and reliability of the second-order cone relaxation are verified.On the basis of the coordination and optimization model of "source network" mentioned above,in order to coordinate and control various controllable resources of ADN and improve the economy and reliability of distribution network operation,a coordinated active distribution network operation optimization model of "sourcenetwork-load-storage" is proposed by comprehensively considering the price-based demand response,incentive demand response and energy storage system.Taking distributed generation,network structure,demand side management and energy storage system as control means,taking into account the power purchase cost,network loss cost,reconstruction cost,energy storage loss cost and demand side management cost,the optimization model is established with the goal of minimizing the daily operation cost of the distribution network.The rationality and feasibility of the optimization model are verified by simulation on the test system based on IEEE33 node system.Through the comparison and analysis of various coordination and optimization results,it is shown that the optimization model considering the coordination of "sourcenetwork-load-storage" can make full use of all kinds of controllable resources of ADN,and the optimization effect is the best.