Research On The Key Technology Of The Reactive Power Optimization Of Distribution Network Based On Power Electronic Transformer

No matter for the past distribution network or present distribution system,voltage is always a very important element of measuring system stability in the whole power distribution process,that is to say it is very essential to make reactive power optimization for the distribution system.In terms of domestic distribution system,most network is in a status of lacking of reactive power which cause sever network loss and greatly consumed national,financial and material resources.Nowadays,distribution system becomes more and more complex,thus the selection of reactive power optimization can’t be in the form of a series of traditional methods,some of which is hard to deal with present complex system.In the face of a complex problem,traditional method is easy to converge to local optimal solution even has the possibility of no convergence.This paper aims to search for a new algorithm to make corresponding improvement for reactive power optimization of distribution system,and to find a more effective solution to the problems exists in the new complex distribution system optimization.Decreasing network loss is of very important significance for the whole power grid which is not only save financial and material resources,but more is to provide a superior environment for social and cultural life.The main components of the distribution network are:line,transformer,capacitor,load,etc.from which the transformer is of top priority in electric power transmission and distribution.For today’s power distribution system,basically there are several ways to make reactive power distribution:phase modifier adjustment(emit and absorb reactive power,but already eliminated),tap regulator of on-load voltage regulating transformer,cutting system of large-scale group shots by small capacitor,static reactive power compensation device and so on.This article mainly focus on improvement analysis for the safe method---on-load voltage regulating transformer tap optimization,it mainly talks about OLTC replacement by EPT and summarizes the advantages andPrimary task of analyzing the distribution system is the calculation of power flow,this calculation can supervise the voltage of each node,the slip distribution power condition and the situation of the network power loss under the premise of not changing system operation method.For reactive power optimization of the distribution system,this article puts forward a new improved genetic algorithm which will outstandingly cope with today’s complex distribution,and set example analysis to prove its feasibility.The improved genetic algorithm has strong searching ability,high speed,and it will search optimal solution more effectively.Applying the improved genetic algorithm to the reactive power optimization of distribution system,with EPT replacing OLTC,by the city’s power grid calculation,reactive power optimization,and comparing traditional on-load voltage regulating transformer with the optimization of distribution network containing power electronic transformer.Through the simple two-node system simulation experiment,this article proves that the power distribution network has excellent stability after replacing by power electronic transformer.