【作者】 刘伟；

【导师】 赵巧娥；

【作者基本信息】 山西大学 ， 电气工程， 2022， 硕士

【摘要】 在目前的高压和特高压交直流输电领域当中,气体绝缘组合电器设备(Gas Insulated Switchgear,GIS)有着较为广泛的使用。但是在海拔较高温差较大的一些地区中,由于受到光照、风速等影响,导致环境的温度变化幅度较大,进一步造成伸缩节发生过度伸缩,整体的密封性受到损坏,内部六氟化硫绝缘气体介质严重泄露,在使用过程中容易发生绝缘击穿,造成重大后果。在此背景下,研究GIS设备的位移在线监测装置和装置组网策略问题显得尤为重要。首先,为了解决变电站运维人员无法及时发现GIS设备伸缩节过度伸缩的问题,本文分析能够对GIS设备运行情况造成较大影响的环境因素,结合变电站实际情况和价格合理性选择传感器类型,设计一种可以测量引起GIS设备位移的多种影响因素的在线监测装置。相比单一的位移监测装置,该装置可以掌握较为全面的信息量,也可以更准确的判断运行情况,并且相比于传统的抄表方式,该装置大幅缩减了抄表用时,显著提升了运维人员的工作效率。其次,本文通过对比各类无线通信技术的利弊,选择使用LoRa无线通信技术将各个节点处监测装置组网。当监测装置在发现数据超出警戒值时,需要增加数据采集及传输的频率,从而可能会导致网络信道资源无法满足全部节点同时进行数据传输,针对此问题本文对网络时钟同步算法和时隙分配算法做出改进,主要包括两部分:(1)在TPSN时钟同步算法的基础上简化网络节点等级并加入定时器辅助校正时钟,相比改进前的算法提高了时钟同步的精度。(2)在TDMA时隙分配算法的基础上加入固定分配时隙和动态变化时隙分配原则,提高了节点对时隙的占有率,信道资源利用率得到显著提升。最后,将制作完成的在线监测装置在变电站现场进行安装调试,并进行监测装置效果验证,通过统计现场实际抄表用时,验证了该装置成功达到预期目标。然后通过在硬件上做试验,进一步验证了改进后的算法在时钟同步精度和时隙占有率两方面均获得较大提升。更多还原

【Abstract】 In the current high voltage and extreme high voltage AC and DC power transmission field,the Gas Insulated Switchgear(GIS)has been widely used.But in the higher temperature difference is bigger in some areas,due to the affected by light wind speed,etc,result in large variations in the temperature of environment,further led to excessive scale expansion joints,the overall sealing damaged,internal sulfur hexafluoride gas medium serious leakage,insulation insulation breakdown in easy in use process,have significant consequences.In this context,it is particularly important to study the displacement on-line monitoring device and device networking strategy of GIS equipment.First,in order to solve the operations staff cannot discover the GIS substation equipment slip joint excessive expansion of problem,this article analysis to larger effects on the GIS equipment running status of environmental factors,in combination with the practical situation of substation and the price reasonable choice sensor types,design a kind of can cause GIS equipment displacement measured a variety of influencing factors of online monitoring device.Compared with a single displacement monitoring device,the device can grasp more comprehensive information and judge the operation more accurately.Compared with the traditional meter reading method,the device greatly reduces the meter reading time and significantly improves the work efficiency of operation and maintenance personnel.Secondly,by comparing the advantages and disadvantages of various wireless communication technologies,LoRa wireless communication technology is used to network monitoring devices at each node.When the monitoring device finds that the data exceeds the warning value,it needs to increase the frequency of data collection and transmission,which may lead to network channel resources cannot meet the requirements of data transmission of all nodes at the same time.To solve this problem,this paper improves the network clock synchronization algorithm and time slot allocation algorithm,mainly including two parts:(1)On the basis of TPSN clock synchronization algorithm,network node level is simplified and timer is added to assist clock correction,which improves the accuracy of clock synchronization compared with the previous algorithm.(2)Based on the TDMA timeslot allocation algorithm,fixed timeslot allocation and dynamic timeslot allocation are added to improve the node’s timeslot occupancy and channel resource utilization.Finally,the completed online monitoring device was installed and debugged in the substation site,and the effect of the monitoring device was verified.By counting the actual meter reading time on site,it was verified that the device successfully reached the expected goal.Then,through experiments on hardware,it is further verified that the improved algorithm has greatly improved the clock synchronization accuracy and time slot occupancy.更多还原