Self-adaptive intelligent energy-saving control method and system for oil field pumping unit

Abstract

The invention provides a self-adaptive intelligent energy-saving control method for an oil field pumping unit, and the method comprises the steps: distinguishing the working state of the pumping unitin each stroke, regulating the pressure of the pumping unit in an electric state, regulating the frequency of the pumping unit in a power generation state, returning to a normal VF curve and the like.The self-adaptive intelligent energy-saving control system of the oil field pumping unit comprises a controller voltage frequency independent VF control module, a voltage regulation module, a frequency modulation module, a regression module and the like, self-adaptive intelligent energy-saving control of the pumping unit can be achieved, and the purpose that the operation rotating speed of a motor is increased when the pumping unit works in a power generation state is achieved. When the VF independent control method works in an electric state, the VF independent control method recovers to a normal operation rotating speed, so that the stroke frequency is not lower than the normal stroke frequency within the same time, and the oil pumping amount in unit time and unit energy is only increased and cannot be reduced. The unique VF independent control method can automatically reduce the output voltage and the output current in a no-load state and automatically store energy under the powergeneration condition; therefore, the energy-saving device can be widely applied to oil field pumping units, centrifugal machines, machine tools and other application occasions with two working modes of electric power generation and power generation.

Description

technical field [0001] The invention relates to the technical field of intelligent control of oilfield pumping units, in particular to an adaptive intelligent energy-saving control method and a control system for oilfield pumping units. Background technique [0002] As a country's strategic energy source, oil symbolizes the strength of a country and plays a very important role. The four-link pumping unit currently used in my country's oil field industry is the largest, commonly known as the donkey head pumping unit. For the four-link pumping unit in the oil field, it is mainly driven by an asynchronous motor. There are currently two types, the first The first is a power frequency asynchronous pumping unit, and the second is a frequency conversion asynchronous pumping unit. Frequency conversion asynchronous pumping unit has obvious advantages in stable start, energy saving and environmental protection, frequency conversion speed regulation can improve oil production efficienc...

AI Technical Summary

Problems solved by technology

[0004] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide an adaptive intelligent energy-saving control method and control system for oil field pumping units, which can adaptively realize VF balance control, and automatically adjust the output voltage and output voltage of the controller. The output frequency enables the two to be controlled in a balanced and coordinated manner. The two can be controlled independently and coordinated, which is used to solve the problem of energy waste in the state of electric and power generation of the pumping unit in the prior art.

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