Study On Optimization Of Integrated Benefits Of Distributed Generation In Distribution Networks Considering Multiple Constraints

Faced with the pressures of energy crisis,environmental pollution and economic development,large-scale distributed clean energy grid-connected operation has become an inevitable trend.However,the development of the distributed generation(DG)is limited due to its high cost and high grid-connected risk.Therefore,the research in this paper will focus on solving the problems of safe and stable operation of DG and optimization of their comprehensive benefits,providing a reliable reference for decision makers.First of all,this paper summarizes and analyzes the various insecure effects of distributed generation and grid-connected distribution networks.Based on the analysis,a multi-constraint conditional decision model including line overload constraints,protection coordination action constraints,total capacity constraints,voltage constraints,and power flow equation constraints is established.Aiming at the integrated benefits of DG,a comprehensive benefit assessment system including voltage improvement benefits,line loss benefits,environmental benefits,and energy efficiency benefits is built in this paper.Then,in order to solve the above model,a dynamic multi-DG grid-connected short-circuit calculation model,a dynamic multi-DG grid-connected power flow calculation model and a particle swarm optimization(PSO)optimization model are established based on MATLAB.In order to solve the problem that the PSO algorithm is easy to be premature and fall into the local optimal solution in the optimization process,an improved PSO algorithm based on the hybrid idea and the linear degressive weighting method is proposed.Finally,three different structures and characteristics solution models including IEEE33-node system,IEEE14-node system and an actual distribution network system are respectively verified,fully demonstrated the versatility and practical value of the model.The detailed solution results of different calculation examples are given.The results show that under multiple security constraints the optimal access of DG can effectively increase the voltage level of the system and reduce the line loss of the system,decrease the total economic cost of the distribution network under the consideration of DG line loss efficiency and environmental benefits,and significantly increase the comprehensive benefit evaluation.The results fully demonstrate the unique advantages of DG in energy conservation and emission reduction,and have important theoretical and practical reference values.