Flexible variable-frequency voltage-regulating closed-loop energy-saving control system and method for beam-pumping unit

Abstract

The invention provides a flexible variable-frequency voltage-regulating closed-loop energy-saving control system and method for a beam-pumping unit. The system comprises a beam-pumping unit, a motor, a torque sensor, a rotating speed sensor and a frequency conversion control cabinet. The motor drives the beam-pumping unit to operate; the torque sensor and the rotating speed sensor are used for detecting torque and rotating speed of the motor in real time; the frequency conversion control cabinet is connected with the torque sensor and the rotating speed sensor and used for analyzing load characteristics and outputting the optimal flexible frequency and the optimal flexible voltage in real time. The method comprises the steps that the driving frequency and the driving voltage of a motor are flexibly adjusted in real time by detecting the two-way alternating fluctuation load in the period of the beam-pumping unit, and high-load low-frequency high-voltage and low-load high-frequency low-voltage are achieved; the inertia load of the system is redistributed by adopting flexible variable-frequency speed regulation, peak load shifting is carried out on load torque, load fluctuation is reduced, and reverse power generation is eliminated; and magnetic flux required by the load is provided in real time by adopting flexible voltage regulation, so that energy conservation and consumption reduction are realized.

Description

Technical field [0001] The present invention relates to the field of oil and gas mining. Background technique [0002] As the oil and gas mining is in-depth and crude oil production, the formation supply capacity is not sufficient to support oil wells, in order to improve oil-exploitation efficiency, artificial lift equipment has received more and more extensive applications. At present, artificial lifting equipment mainly includes: pumping machine, electricity pump, screw pump, high-pressure gas lift, etc., the beam type pumping machine is simple in structure, and the performance is reliable and the price is low, which occupies the main market share. The beam pumping machine is mainly composed of an oil pump, a rod, a light rod, a four-pole mechanism, a gearbox, a belt, and an electric motor. The motor drives the crank as a rotational movement through the speed of the belt and the gearbox, and the four-rod mechanism converts the rotational motion into the linear movement of the ...

AI Technical Summary

Problems solved by technology

[0004] 1. Open-loop optimization is used to determine the optimal driving frequency, which relies heavily on the system dynamic simulation model, which takes a long time and is difficult to achieve closed-loop dynamic adjustment according to changes in oil well conditions;

Images