Research On Theoretical Line Loss Calculation Of Distribution Network Containing High Proportion Of Distributed Power Sources

A large number of distributed generations(DGs)are connected to the distribution network,which changes the network structure and operation mode of the distribution network.The unique spatial and temporal characteristics of DGs change the distribution network from passive operation characteristics to alternating active and passive operation characteristics,and the branch currents change from unidirectional to bidirectional alternating flow,and the characteristics of line loss also change significantly from the traditional distribution network line loss characteristics.The existing line loss algorithm for DG is based on a certain approximate equivalent calculation or on an ideal model,which reveals to a certain extent the law of distribution network loss change containing distributed power supply,but the DG access is single and the proportion is low.With the increasing proportion of DGs connected to the grid,finding a method that can quickly estimate the theoretical line loss of the distribution network after a high proportion of DGs are connected to the grid is an important positive impetus to the optimization of the distribution network loss reduction problem and the improvement of the economic efficiency of the grid.This paper firstly describes the current situation of DG development and the current status of research on distribution network line loss calculation,pointing out that with the vigorous development of DG,it is necessary to study its impact on distribution network line loss,not only to explore and analyze the causes of line loss,but also to improve the existing line loss calculation methods to improve the accuracy of line loss calculation;secondly,it analyzes the characteristics of high proportion DG and the composition of line loss,and then introduces the impact of DG access on line loss.Qualitative analysis is conducted from three aspects:access capacity,access location,and random volatility,revealing the main laws;again,the importance of conducting theoretical line loss in distribution networks is introduced,the impact of DGs on line loss calculation is discussed,and the limitations of the traditional line loss algorithm are analyzed;after that,an improved theoretical line loss algorithm for distribution networks containing different data densities is proposed.After that,an improved theoretical line loss algorithm for distribution networks with different data densities is proposed,the basic steps of the algorithm are introduced,and the accuracy of the results is compared with the equivalent resistance method and the tide method by using the algorithm to calculate the IEEE 17 node model;finally,the design and construction of a line loss visualization interface based on advanced Internet technology is realized.The data in the DataSet is exported in Json file format using ADO.NET technology,which is convenient for the front-end program to call.Using HTML5 and CSS3 to design each functional module of the line loss quadratic management visualization interface to realize the data display in different dimensions.Use JavaScript for web dynamic design,realize the interaction between client and server through hypertext transfer protocol,query the various operational data in the database,and realize the complete line loss visualization web development.