Method for controlling pumping unit motor in frequency-conversion mode

A frequency conversion control, electromechanical technology, applied in the field of frequency conversion control, can solve the problems of voltage waveform distortion, low operation efficiency, waste of electric energy, etc., and achieve the effect of reducing energy waste, suppressing power generation, and reducing energy

Inactive Publication Date: 2014-01-08
NORTHEASTERN UNIV
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Problems solved by technology

Brake unit control is at the cost of more power consumption. Although the feedback unit can return energy to the grid, it aggravates the pollution of the oil field industry to the grid
The more typical one is the relatively mature two-level PWM frequency conversion control to control the motor of the pumping unit, so that it has the characteristics of energy saving, but its output voltage contains a large number of harmonic components in addition to the fundamental wave. Distortion of the voltage waveform is caused, so the operating efficiency is low and a lot of electric energy is wasted

Method used

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  • Method for controlling pumping unit motor in frequency-conversion mode

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Embodiment 1

[0015] In this embodiment, a pumping unit with a 37KW motor is used, and the torque of the motor of the pumping unit is detected by a torque detector installed on the shaft of the motor. The torque detector is selected as STM2000.

[0016] The specific process of frequency converter frequency control for the pumping unit of the present embodiment 37KW motor is as follows figure 1 Shown: Include the following steps:

[0017] Step 1: Set the initial torque value to zero, and specify the positive direction of the torque of the motor, specifically: when the detected torque value is greater than zero, the torque direction is positive; when the detected torque value is less than zero, turn to The moment direction is negative.

[0018] Step 2: Detect the torque value of the 37KW motor through the torque detector. If the detected torque value is less than the initial set torque value zero, it means that the motor is in the state of generating power. At this time, there is braking ene...

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Abstract

The invention provides a method for controlling a pumping unit motor in a frequency-conversion mode. The method is good in energy-saving and environment-friendly effect. The torque of the pumping unit motor is detected through a torque detector arranged on a rotary shaft of the pumping unit motor, the output frequency of a frequency converter is increased when the pumping unit motor is detected to be in the electricity generating state, so that the electricity generation of the motor is restricted, the energy fed back to a direct current circuit of a brake unit in the frequency converter is greatly reduced, and even no feedback exists. The possibility that the frequency converter is damaged due to the fact the voltage rises too high is avoided, and energy waste is avoided.

Description

technical field [0001] The invention belongs to the field of frequency conversion control, in particular to a method for controlling the motor of a pumping unit by changing the frequency. Background technique [0002] At present, most oil production equipment in my country's oilfields uses beam pumping units, and its mechanical structure is doomed to have problems such as low power factor, high harmonic pollution, and a large amount of potential energy wasted due to reciprocating motion that cannot be recovered. For the oil pumping industry, which itself consumes a lot of energy, it is undoubtedly worse. The energy saving of pumping units has become one of the most concerned issues in related industries. [0003] Because pumping unit motors generally use three-phase asynchronous induction motors, people have turned their attention to the vigorously developed frequency conversion technology in recent years. The application schemes of frequency conversion technology in oil be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P27/06
Inventor 满永奎王冰玉赵霖赵强
Owner NORTHEASTERN UNIV
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