Research On Optimization Technology Of Active Distribution Network

With the depletion of traditional energy and the increasingly serious environmental pollution,photovoltaic and wind turbine-based distributed power supply will participate in the grid,and the equipment and control mode of traditional distribution network will not meet the security of distribution network.High quality and economic operation requirements.Compared with the traditional distribution network,active distribution network(Active Distribution Network,ADN)is the main carrier of dissipating distributed renewable energy generation,which has the advantages of distributed generation,energy storage,and so on.Distributed resources such as controllable load automatic control and flexible and variable network topology management distribution network power flow characteristics,to provide users with more secure,reliable,high-quality,efficient and environmentally friendly services.In this paper,the node types of distributed power supply when connected to the grid are analyzed.According to the different operation modes of common distributed power supply,it is simulated as four different types of nodes in PQ,PI,PV,PQ(V).The influence of the type,location and permeability of distributed power supply on the power flow of distribution network is analyzed.Secondly,in view of the "premature" phenomenon of genetic algorithm and the disadvantage of slow searching speed of ant colony algorithm,the genetic algorithm and ant colony algorithm are fused.The fast global optimization ability of genetic algorithm is used to provide the pheromone needed for ant colony algorithm to solve the problem.A mathematical model of distribution network reconfiguration aiming at the minimum network loss is established.In view of the topological changes brought by distribution network reconfiguration,thenodes are layered and the auxiliary matrix is generated dynamically to identify the network structure.Then according to the idea of "loop breaking method",an individual coding strategy based on ring network is designed.This method can effectively reduce the generation of infeasible solutions,and proposes to judge the topological feasibility of distribution network by the size of node degree.Finally,the IEEE33 node system is used as an example to simulate and calculate.The analysis shows that the genetic ant colony algorithm can quickly and quickly solve the optimization problem of distribution network reconfiguration,reduce the network loss,improve the voltage level,and provide the basis for power network dispatching.