Energy-saving Control Method's Research Of The Pumping Unit Electric Motor Under The Variable Voltage And Variable Load Condition

The thesis first establishes the pumping unit-electric motor's one-dimensional dynamic model.The model takes the description of the sucker-rod one-dimensional vibration's damped wave equation as the foundation.And thesis selects the polished rod movement and oil pump's load as boundary condition.The thesis also considers the influence of the electric motor speed's fluctuations on the system's dynamic characteristic.The electric motor speed's characteristic of this model reflects based on the electric motor's physical characteristics curve. Then thesis studies the electric motor's part mainly which considers the electric motor's energy consumption model of the electric motor parameters's variation.And the paper combines this model with the model of the pumping unit. Thesis consummates the pumping unit-electric motor system's model and enables this model to complete the energy consumption's solution. In addition,the paper carries on some simulation studies and actual measurements to the crank's balance and the intermittent power supply's methods.The result shows that it can obtain a higher energy conservation's effect when the crank's balance combines the the intermittent power supply's control for the pumping unit-electric motor system.