A control method and device for a tower pumping unit

Abstract

The invention provides a tower type pumping unit control method and apparatus. The control method comprises the steps of obtaining running parameters of the tower type pumping unit after reversing when the current set frequency of the tower type pumping unit reaches a preset reversing frequency for reversing, wherein the running parameters comprise accelerated running time, uniform velocity running time, decelerated running time and preset uniform velocity running frequency; calculating the set frequency corresponding to each moment in the running of the tower type pumping unit after reversing based on the running parameters; after obtaining the position set value corresponding to the set frequency of each moment, and under a condition of detecting a position correction signal, enabling the setting frequency of the tower type pumping unit to reach the preset reversing frequency for performing each moment of abnormal reciprocating running after reversing; and performing correction on the set frequency of the current moment based on the position set value and the position feedback value of the current moment so as to obtain a target given frequency of the current moment, so that the travel control precision for the tower type pumping unit in the up and down reciprocating running is improved by using the position control added in the invention so as to enable the overall running process to be stable and to enable the reversing to be more smooth.

Description

technical field [0001] The present invention mainly relates to the technical field of motor control, and more specifically relates to a control method and device for a tower pumping unit. Background technique [0002] At present, most of the pumping units used in my country's oil exploitation are beam pumping units, which are usually directly driven by an AC asynchronous motor, and the crank belt and the counterweight balance block drive the sucker rod to drive the downhole pump for fixing. Periodic up and down reciprocating motion, so as to send downhole oil to the surface, reliable operation and easy control, meeting the basic requirements of oil exploitation. [0003] However, with the rapid increase of my country's population, the problem of energy shortage is becoming more and more serious. The existing beam pumping units have low efficiency and high power consumption, which have become problems that need to be overcome urgently. For this reason, a tower pumping unit ha...

AI Technical Summary

Problems solved by technology

[0004] However, in practical applications, due to the high failure rate of encoders used for motor speed measurement, many customers are unwilling to install encoders, hoping to use an open-loop control scheme to realize the control of the pumping unit, and, in its actual operation During the process, it is necessary to frequently switch the forward and reverse directions of the motor, and it is difficult to ensure the smooth and reliable reciprocating motion of the tower pumping unit

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