Research On Security Distance Of Distribution System

The importance of distribution system is self-evident.N-1 distribution network security is a basic security evaluation criteria for distribution system planning and operation,in recent years the emergence of a new method with constraint concept description N-1 the security of the distribution network,calling Distribution System Security Region(DSSR),and the related research for the future under the background of smart grid distribution network and efficient operation provides a new solution,and is likely to lay a new foundation for the security analysis of distribution network.In this paper,the development of DSSR theory,studies the security distance of distribution system,namely the work security distance to DSSR security boundary,and analyze the physical meaning of the security distance and some of the characteristics of the mathematics and down demonstration.The main work is as follows:1.The mathematical foundation of security boundaries is studied.This paper expounds the DSSR model of the existing source,and security domain model to find clues,and simulation of distribution network N-1 security discovery,and through the simulation method,it is proved that the security domain model can find the key and the correctness of the model,given the existing distribution network security domain model,with the representation of the boundary of mathematics are properties of the security boundary,and the boundary of the safe and effective screening method and screening principle.2.The security distance of distribution network is studiedThe security distance of the distribution network is studied.First of all,elaborated mathematics in different distance definitions,select the appropriate mode of distance definition,and to give a mathematical definition of geometric distance and security feeder security distance,and explains the physical meaning of the geometric distance and the safe distance of the safe feeder.Secondly,analysis of the engineering application of safe distance potential,and detailed comparison of power network security distance and the safe distance of the distribution network of the similarities and differences,the convenience of the reader to further understand the characteristics and significance of the distance distribution network security.3.The analysis of using the safe distance for the security evaluationAt first,the traditional security evaluation method,N-1 simulation and verification method,is introduced.Secondly,introduces the principle of N-1 check based on the security distance,which respectively include: N-1 check the security and security of the N-1 check.Finally,a practical example is presented to demonstrate the results of security evaluation of distribution network based on the security distance,and the accuracy and rapidity of the system is demonstrated.4.The analysis of using the safe distance for the security controlFirstly,the control method of using safe distance at work point is introduced,and the load margin of each feeder line or feeder line is given.Secondly,this paper introduces the control method of using safe distance in the working point is not safe,and based on this method to adjust the minimum load,adjust the minimum load,and finally make the new working point to meet the security of the whole network N-1.At the end of this section,we demonstrate the efficiency of this method.