CN200983573Y

CN200983573Y - Efficient DC share energy-saving and theft-prevention control system of oil extraction well station

Info

Publication number: CN200983573Y
Application number: CN 200620134983
Authority: CN
Inventors: 杜宾; 李德印
Original assignee: HENAN ZHONGYOU CONSTRUCTION ENGINEERING Co Ltd
Current assignee: HENAN ZHONGYOU CONSTRUCTION ENGINEERING Co Ltd
Priority date: 2006-12-12
Filing date: 2006-12-12
Publication date: 2007-11-28
Anticipated expiration: 2016-12-12

Abstract

The utility model discloses an energy-saving burglarproof control system with high efficiency and direct current sharing for oil production stations, comprising a transformer and an alternating current motor arranged at the well head and connected with a transformer circuit. Wherein a rectifying device and a contravariant speed governor at the well head are arranged in turn on a circuit connected with the motor behind the transformer, the rectifying device and the contravariant speed governor are connected by a direct current bus bar. The utility model has the advantages that (1) the damage of pilfering electricity caused by delivery of alternating current can be solved by using time-sharing variable direct current as power supply which can not be used by commercial electrical equipments, (2) much electric energy can be saved by using a frequency-controlled active converter, (3) the effect of saving more energy can be achieved by adjusting the magnitude of voltage in time according to the variation in load using a controlled rectifier, (4) energy dissipation of the power-supply network is reduced and electric energy can be saved by stochastic sharing of the direct current bus bar, (5) the assembly and debugging are convenient, thereby saving cost.

Description

Producing well station efficient direct current is shared the energy-saving anti-theft control system

Technical field

The utility model relates to a kind of producing well station energy-saving anti-theft electric control system.

Background technology

The oil field overwhelming majority of China is low energy, stripper field, unlike external oil field very strong blowing ability is arranged, and most of oil field will press oil to go into well by water filling, by oil pumper (machine of kowtowing) oil is elevated from the stratum.Changing oil, change oil with electricity with water is the reality in present China oil field, and the electricity charge have accounted for sizable ratio in the cost of oil production of China, so petroleum industry is attached great importance to saves energy.

The recoverable amount of China's oil pumper is more than 100,000 at present, and motor installation total capacity is at 3500MW, and a year power consumption exceedes 10,000,000,000 kWh.The operational efficiency of oil pumper is low especially, is 25.96% at China's average operating efficiency, and external average level is 30.05%, and year energy-conservation potentiality can reach tens kWh.

Except oil pumper, the oil field also has equipment such as a large amount of water injection pumps, oil transfer pump, oil-immersed pump, and total power consumption surpasses 80% of oil field total electricity consumption, and as seen, petroleum industry also is to promote the key industry of " electric system is energy-conservation ".

Oil well power supply generally by cable is delivered to individual well by the transformer transformation to 380VAC or 1.14KVAC from 6KVAC, 35KVAC, because to the individual well transmission line is the standard household parameter, and the oil field all is positioned at spacious open-air area, so the resident can usurp easily near the oil well, cause the oilfield electric net shakiness, loss is serious.

Summary of the invention

The purpose of this utility model provides a kind of producing well station electric control system with energy-saving anti-theft function.

For achieving the above object, the utility model adopts following technical scheme: a kind of producing well station efficient direct current is shared the energy-saving anti-theft control system, comprise transformer and the alternating current motor that is connected with transformer circuit that is positioned at well head, after transformer with on the circuit that motor links to each other, be provided with rectifying device and well head inversion speed-governing device successively, link to each other by dc bus between rectifying device and the well head inversion speed-governing device.

Described rectifying device is a concentrated rectifier box that is positioned at after the transformer, and described motor has a plurality of, is equipped with a well head inversion speed-governing device before each motor, and a plurality of well head inversion speed-governing devices are by in the rectifier box in the dc bus access set.

Adopt technical scheme described in the utility model that following advantage is arranged:

1, divides the variations per hour power supply

Adopt and divide variations per hour direct current supply, be two phase variable DC power supply entirely between measuring station and the oil well, and can carry out (between the 400V-530VDC) to magnitude of voltage at random with Single-chip Controlling through the two-phase DC power supply behind the controlled rectification and adjust, civil electric appliance can't use, and has solved well to exchange the stealing loss of sending electricity to cause.

2, adopt control active inverter frequently

Because control is the proposition and the application widely of active converter technique frequently, has saved a large amount of electric power energies.The oil pumper RHVC is utilized variable-frequency control technique and brilliant lock inverter circuit exactly, can reduce efficient, the energy-conservation automatic controller of cost of crude oil production specially significantly for oil-field oil pumper design.It has all functions that domestic and international universal frequency converter has, as in start-up course, can reach zero open, the soft electricity-saving function that opens, make the motor driving system smooth transition to rated speed, limiting starting current effectively, impact that when having avoided starting current excessive electrical network has been caused and quick power consumption etc.

3, to adopt controlled rectification to adjust voltage more energy-conservation in good time

Power rectifier partly adopts controlled rectification, can be according to load variations in good time to the magnitude of voltage adjustment, in the hope of power because of further raising is arranged, thereby reach more energy-conservation effect.

4, dc bus is shared at random, saves energy

Because the varying duty of oil pumper, in upper and lower stroke work, half is in generating state, common motor frequency conversion device with brake resistance with electricity amount slatterning in vain.After adopting DC bus powered, multi-machine shared dc bus, as long as having an inverter not to be in anti-generating state in this system just can fall the anti-energy utilization of generating electricity generation of other inverter rather than consume, reduced the energy loss of supply network, thereby the energy that will slattern is fully utilized, simultaneously power factor is brought up to more than 0.96 by original about 0.3, energy-conservation more obvious, power savings is than using dynamic braking resistance more piece energy 16%-24%.

5, integrated Installation and Debugging are convenient, save cost

Adopt direct current supply, common DC bus-bar system, only need dispose a power rectifier cabinet, and only need dispose Converse speed regulation apparatus, and need all not carry out rectification, significantly reduced improvement cost at each well head at each well head at transformer station's output.

Description of drawings

Figure 1 shows that system of the present utility model connection diagram;

Figure 2 shows that rectifying device theory diagram in the utility model

Figure 3 shows that rectifying device circuit theory diagrams in the utility model;

Figure 4 shows that the theory diagram of the utility model major loop;

The theory diagram of well head inversion speed-governing device in the utility model shown in Figure 5;

The circuit theory diagrams of well head inversion speed-governing device in the utility model shown in Figure 6.

Embodiment

As shown in Figure 1, the utility model comprises a transformer 1 and a plurality of alternating current motors 5 that are connected with transformer 1 circuit that lay respectively at a plurality of well heads, after transformer 1, be provided with a concentrated rectifier box 2, be equipped with a well head inversion speed-governing device 4 before the motor 5 of each well head, a plurality of well head inversion speed-governing devices 4 are by in the rectifier box 2 in dc bus 3 access sets.

As shown in Figure 2; the half control bridge is the controlled power device among the figure; single-chip microcomputer is finished the control of triggering signal by the three-phase voltage zero passage is sampled; detection by external potentiometer realizes elegant manual adjustment; can finish the automatic adjusting (can do the adjustment of timesharing voltage quantities) of voltage by the detection of direct voltage, do certain protection by the detection of direct current according to program.Be illustrated in figure 3 as the rectification of full-bridge half control, L12, L22, L32 are respectively three-phase alternating current among the figure, P, N are respectively the positive and negative of direct current, G1K1, G2K2, G3K3 are respectively the control end of three-phase controlled rectification, each is made up of a rectifier diode and a controllable silicon, can control having or not of direct voltage by the silicon controlled break-make, can realize the control of dc voltage value by the control of thyristor operating angle, become direct current controlled rectification process thereby reach three-phase alternating current, realize AC-DC.

As shown in Figure 4, the utility model major loop comprises three-phase controlled rectification, filter capacitor group, DC master row bus, two-phase DC link, well head special inverter and brake unit part.Three-phase controlled rectification is based on the silicon controlled control theory, is the power rectifier equipment that target is developed with DC bus-bar voltage after the adjusting rectification.The filter capacitor group is the commutation inversion necessary part, and the effect of playing is a lot, for example: for input and output are done a buffering, energy, absorption peak voltage are provided, improve power factor or the like for output.This system's major part is that dc bus is shared, the course of work of oil pumper must cause motor to be in anti-generating state for some time, must add that all brake unit and brake resistance consume the voltage of dc bus (because the relation of IGBT to such an extent as to be used for the common frequency converter of oil pumper, the electric weight of anti-generating can be deposited in the filter capacitor, and causes the safety of the voltage rising harm frequency converter of dc bus itself).Certainly we can be understood as: in the process of the anti-generating of motor, if there is a coupling to load on electricity consumption preferably on the dc bus, his DC bus-bar voltage just can not rise (can not descend because of the excessive DC bus-bar voltage that causes of load), and preferably this load is to do useful work (brake unit and brake resistance are flogging a dead horse).Best answer is another motor that is moving and be not in anti-power generation process.So, in the n platform motor common DC bus-bar system, as long as their anti-generating dutation section is the rising that just can not cause dc bus of staggering.

For the anti-generating dutation section that prevents multiple motors does not stagger, perhaps have only the separate unit motor in operation, we have also added brake unit in design.

The use that can only complement one another of the power rectifier of well head special converter and dc bus shared system part, the well head special converter is the same with common frequency converter on function, all functions that equally have common frequency converter and had.

The advantage of this transmission control mode is to divide the variations per hour power supply.General frequency-converting speed-governing control system adopts the alternating current transmission between transformer station and well head, and oil field electricity consumption and civilian power standard basically identical, the resident can usurp easily near the oil well, causes the oilfield electric net shakiness, and loss is serious.And after adopting the direct current supply of branch variations per hour, be two phase variable DC power supply entirely between measuring station and the oil well, and the two-phase DC power supply behind the process controlled rectification can timesharing be carried out (between the 400V-530VDC) adjustment to magnitude of voltage, civil electric appliance can't use, and has solved well to exchange the stealing loss of sending electricity to cause.

As shown in Figure 5, the utility model adopts control active inverter frequently, by direct voltage, three-phase output current are sampled, gather various input control signals, output three-phase six tunnel inversion triggering signals, be input to the well head threephase motor through IGBT, its various output signals and parameter are provided with equal can the demonstration by display screen.As shown in Figure 6, P, N are respectively the positive and negative of direct current among the figure, and B1---B6 is the control signal angle of 6 IGBT of control, and U, V, W are respectively the three-phase alternating current (delivering to motor) after the inversion.Ben Tuli refers to that specially the two-phase direct current becomes the process of three-phase alternating current, and it has the control IGBT that awards of 3 two unit (perhaps 16 unit) to finish this work.Control section is realized the inversion process of two-phase direct current to three-phase alternating current by the control to 6 IGBT.

Claims

1, the shared energy-saving anti-theft control system of a kind of producing well station efficient direct current, comprise transformer and the alternating current motor that is connected with transformer circuit that is positioned at well head, it is characterized in that after transformer with circuit that motor links to each other on be provided with rectifying device and well head inversion speed-governing device successively, link to each other by dc bus between rectifying device and the well head inversion speed-governing device.

2, the shared energy-saving anti-theft control system of producing well station efficient direct current as claimed in claim 1, it is characterized in that: described rectifying device is one and is positioned at transformer concentrated rectifier box afterwards, described motor has a plurality of, be equipped with a well head inversion speed-governing device before each motor, a plurality of well head inversion speed-governing devices are by in the rectifier box in the dc bus access set.