Design And Implementation Of Distribution Automation System In Changxing Island Area

In recent years,the distribution network has developed rapidly.In the newly added distribution network lines,cable lines are the main ones.Compared with overhead lines,cable lines have more contact switches.One of its advantages is that when the line fails,the power supply downstream can be restored to normal through the contact switch,which has the advantages of flexible operation mode and good economy.At present,there are two main types of distribution network automation system in Changxing Island area: one is local reclosure system,which is formed by the cooperation between reclosure and switch.It has many limitations.Processing work according to the principle is inefficient and can only be used in case of failure;the other is centralized distribution network automation.This system has a high degree of automation,but every time it needs information to be transmitted to the main station for distribution.In this paper,a set of solutions for urban distribution automation system is proposed,and the port-vicinity industrial zone is used as a pilot to simulate and compare with the actual situation.The advantage of this system lies mainly in its real-time performance.It can observe and deal with system faults in real time.The processing position is placed in the intelligent terminal.The fault location can be achieved only by switching and current transformer information on both sides of the fault location.No need to install voltage transformer or directional power components,no need for time coordination and time synchronization,facing the operation mode adjusted at any time can easily achieve fault handling.The main work in this study is as follows:Characteristics of Distribution Network Structure in Changxing Island Area,one is the single radiation network,how to transform it to make the load distribution more reasonable.Secondly,the multi-segment distribution network is analyzed,and the principle and scheme of primary equipment transformation are put forward.Taking the practical application of intelligent distributed feeder automation system in Changxing Island Port-vicinity Industrial Zone as an example,the fault types in the system are counted and simulated by using MATLAB software.The fault voltage waveforms at different locations of distribution network are analyzed,and the validity and feasibility of the system design are finally verified.A distribution automation system is designed for permanent and instantaneous faults in power grid.The topological structure of distribution automation is analyzed,and the feasibility of this method is proved theoretically.