Research On Smart Grid Fault Location And Online Monitoring System

With the development of science and technology and the progress of society,the scale of our country’s power grid is also expanding,and the accompanying rise of smart grid technology has also attracted widespread attention from the power industry.The transmission power and voltage levels of transmission lines are also constantly increasing.The number of high-voltage long-distance transmission lines has also increased.For high-voltage transmission lines,once a fault occurs,it will inevitably bring huge economic losses to the country and the people.Therefore,accurate and rapid positioning of high-voltage transmission line faults is made.It is very necessary.In addition,the failure factors in the smart grid will also have a more serious impact on the security of the grid.It is of great significance to implement online monitoring,quickly determine the location of the fault,and quickly release the fault for the guarantee of grid security.The advantages of smart grid fault location system are mainly divided into two aspects:one is the ability to quickly determine the location of the fault,shorten the time of troubleshooting,and save a lot of manpower and material resources;On the other hand,we can find faults in the line in time to ensure the quick recovery of power and reduce the economic loss caused by power failure.Therefore,the smart grid fault location system has great social and economic benefits,which is an important research project.Once the transmission line fault occurs,can ensure fast and reliable to judge the fault types and quick positioning,for the accuracy of the relay protection equipment,quick action and reliability are extremely stringent requirements.The main research object of this paper is the smart grid short-circuit fault,the fault is one of the most common,by the failure to object to the smart grid monitoring system is studied,meanwhile the principle of common fault location method and conditions of use and analyzed in detail.According to the signals in the fault transient characteristics,presents a C type travelling wave based fault location method,wavelet transform and signal singularity theory,combined with its transmission line failure wave voltage signal lines maximum properties of mold components,realize fault location.Through MATLAB,a detailed model of distributed parameter ultra-high voltage transmission line is constructed,and the circuit fault condition is simulated,and the final result is analyzed and verified.Online monitoring system is designed,some quantities of power grid failure occurs before mutation condition monitoring,if mutation quantity reaches a certain value,logic module will determine failure occurs,and a corresponding alarm pulse signals,fault monitoring system for monitoring to the pulse signal processing,the system is the core of type AT89C51 single chip microcomputer.After processing the output alarm signal,the alarm mode is the indicator light alarm,so that the staff can quickly locate the fault location and timely repair.