Research on a Vector Control System for Asynchronous Motor of Oilfield Pumping Machine

Oilfield pumping units are essential for crude oil extraction, yet traditional control systems often suffer from high energy consumption and frequent failures, limiting their efficiency and reliability. To address these challenges, this study investigates a three-level vector control system for induction motors in oilfield pumping units. A novel three-level voltage source inverter is proposed, integrating a three-level voltage control unit into the conventional six-switch full-bridge inverter topology. This innovative design not only retains the control performance of traditional inverters but also enhances three-level control capabilities, enabling more efficient energy utilization and improved system stability. To optimize the control of the asynchronous motor system, a high-performance vector control strategy is developed, combining indirect vector control with space vector pulse width modulation (SVPWM). This approach ensures robust system performance, particularly in maintaining double capacitor voltage balance under varying operational conditions. Experimental results demonstrate that the proposed system exhibits superior steady-state and dynamic characteristics, with significant improvements in energy efficiency and operational reliability. The study highlights the practical application value of this solution in oilfield pumping units, offering a promising approach to reducing energy consumption and enhancing system performance in industrial settings. This research contributes to advancing motor control technologies, with potential implications for broader applications in energy-intensive industries.