Energy-saving control device for beam pumping unit

Abstract

The related motor saving-energy control device for . 14kV-series walking-beam-type pumping unit comprises a TSC that uses a thyristor capacitor to automatic fast switch compensation on the motor outlet with motor reactive current Iq as signal. This invention reduces loss greatly, and achieves purpose for saving both reactive and active power.

Description

Technical field [0001] The invention relates to the field of petroleum extraction machinery, in particular to an energy-saving control device for a beam pumping unit. Background technique [0002] The beam pumping unit is a mining machine widely used in oilfield systems. It has a simple structure and high reliability; but it has a large starting torque and a poor balance effect. The load changes greatly within one stroke. When the pumping conditions change , The load also changes, which determines that a certain power capacity is bound to remain when selecting the pumping unit. This results in low efficiency, low power factor, and large additional power loss. At present, the total installed capacity of pumping unit motors in my country is about 3,500 MW, and the annual power consumption exceeds 10 billion kW·h. The operating efficiency of the pumping unit is low, and the annual energy saving potential can reach several billion kW·h. [0003] The beam pumping units commonly used i...

AI Technical Summary

Problems solved by technology

Due to the above reasons, the actual load rate of the pumping units is generally low, and the load rate of most of the pumping units is between 20% and 30%, forming the phenomenon of "big horses and small carts"

When the motor is in light-load operation, its efficiency and power factor are low. The power factor of the oil field power distribution system has been low for a long time, and the loss of the low-voltage distribution line is too large. motor, it is advisable to adopt the method of in-situ reactive power compensation of the motor

However, most of the existing reactive power compensation devices use the power factor that changes rapidly when the pumping unit is running as a signal, and the devices without exception adopt a strategy of delay switching, so they cannot play their due role

[0009] There are some methods in the prior art to solve the above problems, such as the beam pumping unit pressure regulation and reactive power compensation control device mentioned in CN2702083Y, and the beam pumping unit asynchronous motor mentioned in CN1808887A energy-saving control method and control device, but the specific implementation of these schemes is relatively complicated, and cannot improve the comprehensive energy-saving of the pumping unit

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