| Traction power supply system often happens short circuit accidents,resulting in high-speed railway operation interruption,if the fault can not be quickly located and timely troubleshooting,will seriously affect the operation safety of traction power supply system,and to the railway transportation and production caused heavy losses.The fault location device is a device installed in the substation.It monitors the transient voltage and current signals of the traction power supply system under the fault state in real time,and gives the position of the fault point through analysis and calculation.Traction power supply system due to its special way of power supply,and the accuracy of fault location accuracy is always the fault location device research and development of a difficulty,the traction power supply system of the application of fault location device,its ranging principle basic it is using the method of impedance,current ratio method,these methods are based on the transient process of calculation and the fundamental component,very vulnerable to line structure,transition resistance,fault type,the influence of such factors as so low ranging precision.Traveling wave method is a fault location method gradually developed in recent years.Traveling wave method uses the high frequency traveling wave signal generated by transmission line to locate the fault,which is accurate and fast.The fault location device based on the principle of traveling wave has been widely used in the power system,but in the traction power supply system is still a gap,which is a hot spot of research and development.Therefore,this paper plans to develop a high precision and high performance fault location device based on Zynq-7000 for the traction power supply system.In this dissertation,the ATP simulation model of traction power supply system is established at first,and the high-frequency transient traveling wave under catenary rail short-circuit fault is obtained through a large number of experiments,which provides the data basis for fault location algorithm.Line identification precision of the Bob determines the accuracy of fault location,so in order to be able to accurately identify the high frequency transient Bob,selected the multiple biorthogonal wavelet base on traveling wave carries on the analysis comparison,is proposed for line Bob recognition higher Bior1.5 wavelet as traveling wave signal wavelet analysis,and will be Bior1.5 wavelet analysis as the core algorithm of fault location device.The focus of this article is the Zynq-7000 r&d fault location device,and completed the hardware design of dme,use Vivado development to achieve the overall structure of each functional module,including A/D sampling module,FIFO buffer module,Bior1.5 FIR module,wavelet modulus and the maximum polarity decision module,fault distance calculation module,child modules constitute the dme whole hardware system and verify the correctness of the system design.Finally,in order to test the performance of the fault location system,the actual high-frequency transient electric popular wave is generated as the input signal of the system under the short-circuit fault of the catene-rail.The measurement results show that the error range of the device is about m,which has a high ranging accuracy and practical engineering application value. |
