Development And Research Of Intelligent Control System In Lightning Protection

Now , The Yellow River commission invested heavily in installing remote computer monitoring system for culvert and sluice , and makes the Yellow River water resources management and water dispatching more scientific, so it is particularly important to insure the system running smoothly .but the culvert and sluice's physical location is so particular , for example , geology and meteorological conditions are relatively harsh , thunderstorm and various electromagnetic pulse violations of probability is relatively frequent and intensity bigger . So the remote monitoring system in thunderstorms season encounter the lightning accident easily , that the equipment badly damaged , system function degradation and paralysis , economic loss bigger .Therefore , effective lightning protection, to ensure that equipment and the personal safety and system running smoothly, has the vital significance.In the Shandong Yellow River culvert and sluice , the exiting lightning protection device of Monitoring system is ZYSPD20K,by many times experiment, the lightning protection device began to act when the power source induction-lightning voltage is more than 1.6 kV, but the end equipment had been damaged in below the breakdown voltage . so the lightning protection effect is not high, not intelligent passive online lightning-proof system, and it has common fatal weakness of the passive lightning-proof system in hysteresis, so it is not safe to install such lightning protection equipment in the culvert and sluice monitoring system in the lightning weather . The initiative lightning protection design thought should be taken when we design the lightning protection device ,and improve the efficiency of control system through the above analysis.Intelligent lightning protection technology realizes the function of forcasting, initiative and timeliness by using the idea of initiative lightning protection , a variety of detection methods, expert system control theory for reference. In this paper , the idea of the expert system control theory is used to achieve intelligent control according to analyze the characteristics of lightning protection systems. The forward inference is used to obtain the rules set of the system through statistics and expert thinking; Through using the statistical characteristics of relative humidity of atmospheric and the radar echo intensity, we analyze and realize the data detectiony. Basing on meteorological conditions in Jinan, there is a linear relationship between the relative humidity of atmospheric and the radar echo intensity is found, so by detecting atmosphere relative humidity for backstepping radar echo intensity, and radar echo intensity just is reaction when the thunderstorm lightning intensity will happen, that provide the statistical basis for lightning-forcasting . Another factor is the electric field strength toward The thunderstorm atmospheric directly. Generally, in the plain areas occurs the negative CG lightning, and the electric field intensity have some time to accumulate, basing on the electric intensity reaches different intensity to set the alarm level, to provide a realistic basis for initiative thinking. In addition, the recognition of Thunder is analysed through collecting the signals, pretreatment, feature extraction, and through the BP neural network identification to judge the weather whether in the thunderstorm state and verify the characteristic information. Finally, the possibility of thunderstorms is judged through the use of lightning-related optical signal analysis, the calculation of the correlation coefficient of lightning optical signal, and the correlation coefficient threshold Settings. the Lightning Image Texture Analysis used in lightning protection control preliminary is studied .According to the statistical relationship of the relative humidity of atmospheric and the thunderstorm, the time accumulating of thunder electric intensity, thunder voice recognition and the principle of lightning image, we establish the corresponding fuzzy control rules, not only realize the general tthunderstorm logic control, and also realize the special thunderstorm in separate control. The control system realize the chamber power lines and signal lines's auto-switching according to the special requirements, and also through SMS or phone to realize the remote control and system monitoring function.In this paper , ABB AC500 PLC is used as On-site workstation , weinview screen MT6070IH as the upper computer . Using EB8000 as software platform develops a Practical system which is already used in culvert and sluice. The Practical application shows that the system is safe, reliable and had already realized the lightning protection effectively.