Energy-storage and environment-friendly type distribution system of oil pumping units
A technology of power distribution system and pumping unit, which is applied in the field of power energy saving, can solve the problems of reduced motor life, increased bus harmonics, and high equipment cost, and achieves the effects of improving the utilization rate of electric energy, improving efficiency and large torque.
Active Publication Date: 2017-05-31
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
Due to the existence of frequency conversion equipment in this solution, the harmonics of the bus increase and the life of the motor decreases. At the same time, the cost of the equipment is relatively high, which increases the cost of the enterprise.
In addition, although the energy generated by the electric motor has been alleviated to a certain extent, there is still room for improvement.
Method used
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Embodiment Construction
[0030] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
[0031] like figure 1 As shown, the power distribution system of the pumping unit in the prior art includes: a high-voltage AC busbar, a transformer, a low-voltage AC busbar, multiple AC motors and matching pumping units. Due to the complex working conditions of the oil well, it is necessary to adjust the speed of the AC motor, and most of them introduce frequency converters for speed control. Since ordinary frequency converters cannot store and release the electric energy generated by reverse generation, the high voltage of the DC bus will increase, resulting in breakdown of components, damage.
[0032] For this reason, a kind of energy storage environment-friendly pumpi...
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The invention discloses an energy-storage and environment-friendly type distribution system of oil pumping units. A main rectification unit rectifies a low-voltage AC, and transmits the rectified current to a DC bus, multiple DC distribution-out lines are connected to the DC bus, each DC distribution-out line provides electric energy for an even number of motors, and the motors drive the oil pumping units which match the motors to work; the number of motors controlled and adjusted by a converter unit is the same with that of uncontrolled motors; and the converter unit is provided with a controller, the controller collects positions signals of the oil pumping units, the bidirectional converter unit is controlled to adjust the motors, and thus, the number of the oil pumping units in an increasing state is the same with that of the oil pumping units in a decreasing state. According to the invention, the motors replace AC motors, the torque is large and easy to adjust; a filtering unit is used for filtering, and the stability of the DC bus is improved; and electric energy generated by motor power generation is stored in an energy storage unit, and the utilization rate of electric energy is improved.
Description
technical field [0001] The invention relates to a power distribution system for a pumping unit, in particular to an energy storage and environment-friendly power distribution system for a pumping unit, which belongs to the technical field of electric power conservation. Background technique [0002] At present, the pumping unit is the main equipment in the current oil production, and it is composed of a motor, a reduction box and a four-bar linkage (comprising a crank, a connecting rod and a beam). my country's oil fields are mostly low-yield oil wells, and the power consumption of pumping units accounts for about 40% of the total power consumption of oil fields, with a quantity of more than 100,000 units. The operating efficiency is low and the waste of electric energy is large. Energy Saving. [0003] The pumping unit is a potential energy load. During the downstroke, the rotor speed of the motor will be greater than the synchronous speed of the motor, so that the motor wi...
Claims
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IPC IPC(8): H02J3/38H02J3/32
Inventor 李君钱志红时振堂李正茂杜红勇李琼
Owner CHINA PETROLEUM & CHEM CORP