Integral self-learning oil recovery controller of motor direct drive beam pumping unit

Abstract

The integral self-learning oil production controller of the motor direct-driven beam pumping unit of the present invention relates to the field of oil exploitation, and is composed of an integral learning controller, an inner loop speed controller, a torque controller, a torque area limiting module, and a motor driver. , the motor and the motor speed detector, the integral learning controller, the inner loop speed controller, the torque controller, the torque area limiting module, the motor driver and the motor are sequentially connected in circuits, and the motor speed detector is respectively connected with the integral learning controller, The inner loop speed controller is connected with the motor circuit, and the integral learning controller is connected with the torque area limiting module circuit. The system structure of the present invention is simple, and the performance of the system is improved through the controller compiled in the driver, so as to realize the self-learning optimization control of motor operation efficiency, power factor, and recovery factor; no redundant hardware is added, and it can be self-adapted in different oil well working conditions Load changes, reducing the adjustment weight and maintenance time, and realizing oil production with strong robustness to load changes.

Description

technical field [0001] The invention relates to the field of petroleum exploitation, in particular to an integral self-learning oil production controller of a motor direct-driven beam pumping unit. Background technique [0002] At present, the beam pumping unit adopts energy-saving controllers commonly used in oilfields, such as interval pumping controllers, star / delta conversion controllers, thyristor pressure regulating energy-saving controllers, and reactive power compensation energy-saving controllers. It is suitable to operate in an environment where it can be stopped and started freely. When the oil well supply is insufficient or the pump is not full enough, stop pumping for a period of time and start again. The motor of the pumping unit is in an intermittent working state, which has a certain energy-saving effect; star / delta conversion Controllers, thyristor voltage regulating energy-saving controllers, and reactive power compensation energy-saving controllers also ha...

AI Technical Summary

Problems solved by technology

Engineers usually pursue the accuracy of speed control. Since the load of the beam pump varies greatly within one cycle of the motor, this will cause the motor to be in the electric state most of the time during one rotation cycle, and the current is very small in a few time periods, or even power generation. In the running state, the power factor of the motor is low, resulting in increased power supply line loss and reduced system operating efficiency

At the same time, due to the low efficiency of the system, part of the energy of the motor becomes harmful and unhelpful heat energy, which will lead to the selection of a motor with a larger capacity, resulting in the phenomenon of large horses and carts, further reducing the operating efficiency of the system and increasing the cost of system hardware

This situation is more obvious when using asynchronous motor drive or synchronous motor drive with common inverter open-loop control, and it is difficult to further improve system performance due to asynchronous motor drive and open-loop control constraints

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