The Research Of Conservation Voltage Reduction In Active Distribution Network Considering The Time Sequence Of Distributed Generator And Load

With the rapid development of social economy,environmental pollution,energy shortage and other problems appeared successively.Electric power has become one of the most important secondary energy sources in the society because it is clean and secure.However,in recent years,with the growing scale,increasingly complex structure and increasing electricity demand of power system,the overload or lack of reactive power compensation leads the node voltage of system is low,which cannot meet the requirements of power supply quality,at the same time the line loss of the system is increasing.In the summer peak load period,the power supply capacity of some areas of the domestic grid is insufficient.It leads power outage in these areas,which causes huge losses in national economy and brings inconvenient to people’s life.Conservation voltage reduction(CVR)technology,as a control method of reactive voltage,is simple to operation and easy to implement.It can not only solve the above-mentioned problem in an economic and effective way,but also achieve energy saving.It is of great significance to ensure the reliability of power supply and the building of a green and clean power grid.Therefore,this paper studies the use of CVR technology in active distribution network under consideration of the time sequence property of distributed generator(DG)and load.The main tasks include:Firstly,this paper summarizes the current research status of reactive voltage control and CVR technology,and puts forward the overall research idea and main work of this paper.Secondly,the concept,operation method and benefit evaluation of the CVR technology are introduced,and the realization form of CVR technology is discussed in considering of the actual structure of domestic power grid.Thirdly,the paper puts forward a kind of multi-objective optimization method which combining NSGA-II and the fuzzy clustering method.A numerical example is proved to validate the feasibility and effectiveness of this method.Finally,considering the time sequence property of DG and load,an improved multi-objective optimization model of IEEE33 system is set up.In this model,DG,shunt capacitors bank and on-load tap changer are included.Four different calculating examples are proved to discuss the effects of CVR technology in the application of active power distribution network.