Research And Design Of Local Protection Technology For Wireless Access In High Altitude Area

In the rapid development of local relay technology today,the relay equipment protection technology requirements are more and more strict,but because the relay equipment mainly USES optical fiber,optical cable and other means of communication,is not conducive to the maintenance and development of the later,at the same time its cost is high,it is difficult to popularize the shortcomings.Therefore,the new generation of intelligent substations in the substation automation system requirements are increasingly high.In situ technology because it can effectively solve the loss of power in the process of signal transmission,and at the same time this technology can effectively reduce the investment and simplify the secondary circuit in the circuit,so it is convenient for equipment maintenance in the later period and real-time regulation in the operation process.In Beijing,Guangzhou,Shanghai and other developed areas,if the cable way access to the in situ protection device,the late operation and maintenance is difficult,because not only buildings and residents are much more developed region,based on the spot were studied based on the wireless access technology,used to simplify the line of deployment at the same time improve the flexibility of the installation and maintenance.This paper reference the IEEE 802.11 N technology and to meet the requirements of substation automation system installation and operation,put forward by the wireless module instead of in situ protection device of photoelectric communication module,the substation automation system is improved,and thus the grid communication equipment in the process of installation and debugging cycle,reduce the secondary loop failure rate at the same time.In terms of reliability,this paper adjusts the weight of the filter in real time according to the adaptive algorithm to ensure its minimum and improve the overall filtering effect of the system.At the same time,this paper adds the adaptive frequency modulation algorithm,which combines the link redundancy in the structure of the wireless access network of the station control layer,and adopts the adaptive frequency modulation algorithm to improve the anti-interference performance of the substation,so as to ensure the stability of the local wireless access technology.In this paper,220 kV substation on yunnan-guizhou plateau is selected for reliability test of in situ algorithm in complex electromagnetic environment.After the access to the experimental data,the network test in shenyang institute of automation equipment,time-sharing multiplexing method is adopted in the experiment,the in situ protection equipment,network equipment and master control computer and access to the equipment after the completion of communication link,aiming at the real time and reliability of system respectively,the simulation and experiment is simulated environment without interference,same frequency interference environment and object of partial shade environment,demonstrates the feasibility of wireless access on the relay protection technology.In the above three different experimental environments,the wireless in-situ technology has a good real-time performance,and its delay time is less than 10 ms,which meets the needs of actual work.At the same time,the reliability of this technology reaches more than 99%,which better meets the standard requirements of substation automation network.