Research On Automatic Leveling System Of Power Tower Based On Hydraulic Outrigger

With the high-intensity exploitation of coal resource, widespread coal mined-out area was formed in the whole country and power tower tilted or even collapse caused by the collapse of mined-out area seriously threatened the security and stability of power grid system. But the current deviation rectification technology of inclined tower in mined-out area was mainly manual leveling mode that was overly dependent on experience to judge and could not adapt to the uneven settlement of tower foundation, which need to make further research on power tower rectification technology and propose effective solutions.This article based on the study and analysis of power tower rectification technology and automatic leveling technology at home and abroad and combined with the surrounding environment and structure characteristics of power tower developped a kind of automatic leveling system of power tower based on the principle of electro-hydraulic proportional control, which put forward the general design scheme using PLC as the control core and adopting four point hydraulic support structure. Furthermore, according to the working principle, the research and design of the components of automatic leveling system power tower were accomplished. Specific contents were as follows:1)The design of leveling mechanism was completed through combining tower foundation reconstruction to form adjustable well structure with hydraulic lifting device so that the function that power tower platform can be locked at any position under long-term heavy load was realized. Static model of power tower platform was established and the relationship between the load of hydraulic outrigger and the inclination of the platform was analyzed. On this basis, two kinds of leveling strategies that were position error control method and angle error control method were studied. A leveling strategy that combined the highest point motionless with angle error control method was proposed according to the comparison among leveling time, leveling accuracy and logic implementation.2)Reliability of hydraulic system was analysised through establishing the fault tree of leveling hydraulic cylinder no action as top event, and effective measures was put forward to improve the reliability of hydraulic system from the perspective of the inherent reliability and operational reliability. Furthermore, the specific ideas for hardware design and software design of control system was proposed, which provided a good basis for the development of automatic leveling system of power tower.3) The mathematical model of electro-hydraulic proportional control system was established and transfer function of control system was derived. According to the Bode criterion, the stability of control system was judged. Targeting the nonlinearity and parameter uncertainty of hydraulic system, the method that was AMESim and Simulink co-simulation combining fuzzy PID control algorithm was put forward to do response simulation and control performance simulation for automatic leveling system of power tower.The research on automatic leveling system of power tower can provide technical support for reinforcement and rectification of transmission inclined tower in coal mined-out area and also has some practical guiding significance for developing the similar type of automatic leveling system.