Study On Location And Sizing Of Distributed Generation In Distribution Network Planning

With the rapid development of network,the traditional centralized power generation and power system long-distance transmission of power system has more and more disadvantages.More and more distributed generation(DG)supply in parallel operation of distribution network side because its characteristics of high flexibility,low-polluting property and strong reliability.Due to DG after the access from the original single power supply,radiant structure,traditional power grid becomes more power of complex network.The domestic and foreign experts on distributed power has done a lot of research and have achieved meaningful results.However,there are still many places need to be improved.In this paper,the influence of locating and sizing of DG is analyzed and studied.First of all,there is a great affect brought to the DG in the reliability of the system?power quality?relay protection and network loss.Meanwhile the effect extend is highly related to the locating and siting of DG.When the DG planning is inappropriate,it will influences the normal operation of the power grid and the waste of resources.Therefore,research on the siting and locating of DG has great importance in both theoretical and practical significance.Secondly,this paper researched and analyzed deeply into the basic principle of artificial bee colony algorithm.It is a relatively young swarm intelligent algorithm,which has the advantages of less control parameters,search speed and robustness,and has been widely applied by domestic and foreign scholars in different fields.However,there are some shortages in the standard artificial bee colony algorithm in this paper.In view of this,an improved artificial bee colony algorithm is proposed:on the one hand,in order to improve the convergence speed of the algorithm,this paper proposed to initialize population uniform design method and reverse based learning;on the other hand,this paper proposed the rank selection in order to meet the global convergence and better robustness.Using the improved artificial bee colony algorithm for the problem of DG,Meanwhile,this paper gives solution approaches and solving steps.Then,this paper proposes a placement model of DG,aiming at optimize the power losses and node voltage of the network with the consideration of power flow constraints,node voltage constraints active power and reactive power constraints and so on.Finally,this paper tests and verifies the effectiveness of the mathematical model established and the artificial bee colony algorithm adopted by a practical lOkV of a city distributed network?IEEE33 Nodes and PG&E69 Nodes Standard Distribution Model.The simulation results verify the validity of the algorithm,and the optimization results are compared with other algorithms.Therefore,reasonable locating and sizing of DG can bring huge economic benefits.The research results have certain practical engineering significance.