复杂工况抽油机变频控制中游梁摆角高精度测量技术研究

Beam swing angle precision measurement system for pumping unit variable frequency control under complex conditions

针对实际油井工程中游梁式抽油机变频调速的控制问题,为了给其电机速度曲线优化提供高精度的摆角信息,以达到提高变频控制效率及稳定性的目的,设计了用于变频控制器的高精度实时游梁摆角测量系统。在复杂工况条件下,为了提高系统测量精度,采用了防脉冲干扰的移动平均滤波法以及分段补偿温度漂移等技术;同时为了有效消除安装误差,提出了摆角测量系统在线标定方法;最后对游梁摆角进行了静态及动态试验。实验及研究结果表明:在实际抽油机-50°^+50°的摆幅内,系统测量精度达到±0.15°,零偏为±0.05°,且抗振效果非常明显,该系统能够满足油田恶劣工况下电机控制系统变频优化调速的使用要求。

Aiming at beam-pumping unit variable frequency drive in oil well, a high-precision and real-time beam swing angle measurement system for variable frequency control was designed, which provides high precision swing angle for the motor speed value curve optimization in order to improve the efficiency and stability. Under complex conditions, moving-average filtering for anti-pulse interference and sectional compensation technique were employed to achieve higher measurement accuracy. The swing angle measuring system online calibration method was proposed to eliminate installation errors effectively. Finally, static and dynamic tests of the beam swing angle system were done. The results indicate that system measurement precision of the swing angle can reach ±0.15° in the range of -50°- ±50°, zero bias is ±0.05° with rigorous anti-vibration ability. This measurement system meets variable frequency driver requirements of oilfield under severe conditions.