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Frequency control method for frequency changer for pumping unit

A frequency control and frequency converter technology, applied in the field of frequency conversion control, can solve the problems of energy waste, consumption, and damage to frequency converters, and achieve the effects of suppressing power generation, reducing energy waste, and avoiding the possibility of destroying frequency converters

Inactive Publication Date: 2005-02-16
满永奎
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the working process of the pumping unit, in order to prevent the voltage from rising too high and causing damage to the inverter, the braking unit is forced to start working and release energy to the braking resistor, but the braking energy is consumed in vain by the braking resistor, resulting in waste of energy

Method used

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  • Frequency control method for frequency changer for pumping unit
  • Frequency control method for frequency changer for pumping unit
  • Frequency control method for frequency changer for pumping unit

Examples

Experimental program
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Effect test

Embodiment 1

[0023] The method of the present invention is to detect the voltage or current value through the detection unit 5 in the DC circuit of the frequency converter or the output end of the frequency converter, judge whether the motor is in the motoring state or in the power generation state, adjust the output frequency of the frequency converter accordingly, and change the speed of the motor , to reduce or eliminate the consumption of electric energy on the brake unit 4 braking resistors; said adjustment of the output frequency of the frequency converter is to adjust the motor speed by increasing or decreasing the output frequency of the frequency converter so that the average speed of the pumping unit reaches The expected speed value of its operation; specifically: when the motor is in the power generation state, increase the frequency converter frequency, and when the motor is in the electric state, reduce the frequency converter output frequency.

[0024] As shown in Figures 1 an...

Embodiment 2

[0030] Such as figure 2 , 5 As shown, the frequency converter is composed of a rectifier 1, an intermediate DC circuit 2, an inverter 3, and a braking unit 4. The detection unit 5 for current detection uses three first current sensors CT1, which are three-phase with the inverter 3 respectively. The output end is electrically connected; the present embodiment adopts a pumping unit with a 37kw motor, and the first current transformer CT1 of the current detection element selects a 150A Hall current transformer, and the result is transferred to the control program in the computer.

[0031] The specific process of the frequency converter frequency control of the pumping unit in this embodiment (such as Figure 5Shown) is: set the initial current value, the embodiment is 10A, detect the size of the output current of the inverter 3 through the detection unit 5, and judge whether the motor is in the motoring state or in the power generation state; when the output current of the inver...

Embodiment 3

[0035] As shown in Figures 3a and 6, the frequency converter is composed of a rectifier 1, an intermediate DC circuit 2, an inverter 3, and a braking unit 4. The detection unit 5 for current direction detection can use the second current sensor CT2, which is connected in series to the inverter. Between the transformer 3 and the braking unit 4; the present embodiment adopts a pumping unit with a 37kw motor, and the second current transformer CT2 selects a Hall current transformer of 150A, and transfers the result to the control program in the computer.

[0036] The specific process of the frequency control of the frequency converter for the pumping unit in this embodiment is as follows: the current direction of the DC circuit 2 inside the frequency converter is detected by the detection unit 5, and it is judged whether the motor is in the motoring state or in the power generation state; when the current direction is negative, the motor In the power generation state, control the ...

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Abstract

The invention belongs to the area of the frequency conversion. The values of the voltagle and the current at the DC loop or the output end of the frequency converter are detected by the detect unit so as to determine whether the electric machine is in the electromotion state or in the dynamoelectric state. Thus, the output frequency of the converter can be adjusted accordingly to change the speed of the electric machine in order to reduce and eliminate the consumption of the electrical energy on the braking resistor. The speed of the electric machine can be adjusted by increasing or decreasing the output frequency of the converter making the average speed of the cooking fume exhauster run at expected speed. The invention possesses the good effect of saving energy.

Description

technical field [0001] The invention belongs to the field of frequency conversion control, in particular to a frequency control method for a frequency converter used in an oil pumping unit. Background technique [0002] When the existing frequency converter is used in the pumping unit, due to the unbalanced gravity load of the pumping unit, or the imbalance between the balance block and the oil rod of the pumping unit, when the pumping unit is rotating, the motor is sometimes in the electric state, sometimes in the power generation status. The reason for the power generation state is that the potential energy in the system decreases and becomes electric energy, so that the motor is in the power generation state, so that the energy is fed back to the DC circuit in the inverter, and the voltage of the intermediate DC circuit rises. In the prior art, the frequency conversion control method of the pumping unit generally adopts the method of releasing energy, and a brake unit is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
Inventor 满永奎李德安
Owner 满永奎
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