Research On Flexible Control Technology Of Pumping Unit

Based on the kinematics and dynamics analysis of four-link mechanism of pumping unit, the kinematics model and dynamics calculation model of pumping unit are established. This technology changes the driving speed of the motor in real time in a swabbing cycle through the active variable speed of the motor, improves the swabbing frequency and the velocity distribution of the plunger in the swabbing process, improves the pump efficiency and increases the liquid production of the oil well, reduces the stress of the rod string and the energy consumption of the motor, and reduces the fatigue environment of the ground transmission system and the whole rod string. The optimal driving speed curve of the motor is determined by the Fourier series expansion of the motor speed. The determination of the Fourier coefficient is based on the goal of output maximization, and it should meet the constraints of the given column stress and motor torque. The pump performance parameters, liquid production, rod stress and motor torque caused by variable speed and other parameters need to be determined in the optimization process, which can be predicted and analyzed by the motion dynamics model and rod dynamics model of the pumping unit under the flexible drive. Finally, MATLAB\Simulink simulation is used to verify the experimental results and achieve the expected goal.