The Research Of Power Flow And Network Loss For The Distribution Network With The Distributed Generationg

At present our country is developing smart grid, which comprises of Generating power transmission of power, transformation of power, distribution of power, useing of electricity and scheduling of grid and so on. In the condition of the world’s energy shortage,Exploring new energy power generation technologies is imminent.More and more electricity experts in all over the world are attracked by many advantages of distributed power generation technologies.How to combine distributed power and centralized power supply network flexible become a focus of experts’s study and one of the goals of developing smart grid,So flow calculation is used as the basis for all research is particularly important.At first, As the three-phase is unbalanced and the line parameter R/X is very large in the distribution system,the traditional methods for power flow calculation are no longer applicable.Three-phase flow calculation is needed and three-phase model is established.Considering all the advantages and disadvantages of various methods for flow calculation,the improved backward-forward sweep is presented.But the backward-forward sweep can not calculate the ring network and PV nodes, a new method is mentioned.The weak rings trueture of the distribution system can be obtained through the superposition principle.There are many kinds of distribute generation, all the DG can not only be seen asPQ nodes. Depending on the different characteristics of the DG, four models arepresented and their respective features and treatments in the flow calculation were mentioned in details. The essence of the method is to transform all kinds of nodes in to PQ node. Meanwhile, Programming calculation based on the IEEE33node example,The results showed that the proposed algorithm can able to unified handle many kind of ring networks with distributed power and has good convergence and adaptability.At last, Researching on the effects of grid including distributed generation to the network loss, Introducting distributed power to pure chain ideal model of distribution network and Analysis of its impact on the change of the distribution network line losses,Through simulation and analysis, Demonstrate the effects of different distributed power access locations and relative load capacity of two different to aspects of line loss.Getting some qualitative conclusions about introducing distributed Power to reduce line losses, which is provides a simple method for the practical application of engineering.