Electro-hydraulic System Based On Frequency Control Of Wind Turbine Blade Mold Hydraulic Tlting Mechanism

Large-scale wind turbine blades, molds divided into upper and lower halves, it is theequipment of the production of wind turbine blades, the upper half of the production moldflip to achieve the merger of the two molds. The use of hydraulic flip to change theworking conditions of the crown block flip mold, greatly improving the efficiency of theproduction of wind turbine blades. However, the inadequacies of the existing moldhydraulic flip system are: the angular velocity of reversal process is not smooth,synchronization, causing mold institutions variant, which led to the production of leafquality problems; the same time, the hydraulic system overflow throttling, low efficiency,system heat. Therefore, to achieve a smooth angular velocity of the existing moldhydraulic flip, multi-frame synchronization, energy conservation is necessary.In this paper, a theoretical analysis - simulation - Field experiments the main line, theideal flip movement kinematics analysis of the mechanical structure of the existing flip,come to the tilting mechanism in various physical quantities in the ideal sportsrelationship.Combined with the relationship between various physical quantities obtained, startingfrom the inverter - induction motor drive, complete the design of the principle of hydraulicflip, thereby establishing the simulation model of the hydraulic system.Secondly, this paper presents a controlled dosing pumps of variable frequency motorspeed control program. For the dosing pumps of the variable frequency motor control V / fcontrol mode, the slip frequency control, vector control and other control methods,analysis compare their advantages and disadvantages to apply to this system, the vectorcontrol system of hydraulic flip conclusion. Departure from the principle of vectorconverter vector converter in this design - three-phase induction motor mathematicalsimulation model, based on a simplified simulation model to meet the engineering designand simulation work.Finally, the combination of the hydraulic system simulation model and inverter -motor to simplify the simulation model, a single flip-frame uniform flip PID controlsimulation analysis, and singular points of the simulation results in the bodies jitter, theintroduction of the Fuzzy-PID compound control, simulation, andthe experimental results show that the fuzzy-PID compound control for improving the singular point in the flipprocess jitter advantage, so the end of Fuzzy-PID compound Control. The control strategybut also pairs of flip frame synchronization control study to determine the strategy ofcombining the same master-slave. And proposed control strategy in the project controlsoftware.