Research On Optimal Operation Strategy Of Distribution Network Considering Distributed Generation

With the rapid development of social economy,fossil energy is exploited and used without control,energy shortage and environmental pollution are becoming more and more serious,climate change is aggravating,and severe weather phenomenon occurs frequently.In order to effectively alleviate energy and environmental problems,new energy technologies,such as wind energy,solar energy and tidal energy,are widely used.Distributed energy is an important direction of the development of new energy,which has the characteristics of clean,energy saving and environmental protection,high efficiency and flexibility,and economic.Nowadays,the utilization rate of distributed power in the distribution network is higher and higher.After grid connection,it will affect the safe operation of the distribution network to varying degrees.Therefore,the optimization of the distribution network including distributed power needs to be solved.In this paper,the hybrid particle swarm optimization algorithm is used to reconstruct the distribution network with distributed generation,and then the improved cuckoo algorithm is used to optimize the reactive power,so as to optimize the operation of distribution network.The main contents of this paper are as follows:(1)Firstly,the operation characteristics of the distribution network with distributed power are introduced,and the influence of the grid connection of distributed power on the distribution network is analyzed.In the simulation case,from the three aspects of access location,capacity and quantity of distributed power,it is verified that the grid connection of distributed power will affect the node voltage and network loss in different degrees.(2)Consider adopting the distribution network reconstruction method to optimize the grid structure to reduce the impact of distributed power grid connection on the operationof the distribution network.Firstly,a mathematical model of distribution network reconstruction with distributed power sources is established;secondly,a hybrid particle swarm optimization algorithm is used,which combines the respective advantages of ant colony algorithm and particle swarm optimization algorithm;Under the constraints of meeting the safe and stable operation of the distribution network and related engineering requirements,the hybrid particle swarm optimization algorithm is used to reconstruct the distribution network with distributed power sources to optimize the operation of the distribution network.Finally,the IEEE33 node system is used as a simulation example to verify the practicability and effectiveness of the algorithm.(3)Consider adopting the reactive power optimization method of the distribution network to further optimize the operation of the distributed distribution network with distributed power.First,the mathematical model of reactive power optimization of distributed power distribution network is established;second,the cuckoo algorithm of multi-strategy search is adopted for the traditional cuckoo algorithm that is easy to fall into the local optimal;Loss is the optimization goal.Under the constraints of meeting the safe and stable operation of the distribution network and related engineering requirements,the Cuckoo algorithm of multi-strategy search is used to perform reactive power optimization on the reconstructed distribution network with distributed power.Finally,the reconstructed IEEE33 node system is used as an example to perform simulation experiments to prove the superiority and feasibility of the cuckoo algorithm of multi-strategy search.