CN103956942A - Device for driving multiple pumping units based on common direct current bus - Google Patents
Device for driving multiple pumping units based on common direct current bus Download PDFInfo
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- CN103956942A CN103956942A CN201410138702.6A CN201410138702A CN103956942A CN 103956942 A CN103956942 A CN 103956942A CN 201410138702 A CN201410138702 A CN 201410138702A CN 103956942 A CN103956942 A CN 103956942A
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Abstract
The invention relates to a device for driving multiple pumping units based on a common direct current bus. The device comprises a front end integrated PWM rectifier and a rear end processing device. The front end integrated PWM rectifier is used for converting alternating current of a power grid into direct current or converting regenerative energy of a motor into electric energy and sending electric energy to the power grid. The rear end processing device is used for driving a motor load through the direct current output by the front end integrated PWM rectifier and comprises a short circuit protection and buffer device and an inverter. The device for driving the multiple pumping units has the advantages that the problems that in the prior art, the power factor is low, harmonic current is large, and energy saving cannot be achieved in the dynamic braking process are solved, and the problem that cost is high on an occasion where the multiple pumping units are close to one another is solved.
Description
Technical field
The present invention relates to oil pumper and drive frequency converting and energy saving device, relate in particular to the oil pumper multimachine drive unit based on common DC bus.
Background technology
Beam pumping unit has another name called the machine of kowtowing, and is the current the most general oil pumping unit of each field use, is also oil field power consumption rich and influential family, electric weight used for oil extractor accounts for 40% of oil field total electricity consumption, and operational efficiency is very low, and average operating efficiency only has 25%, power factor is low, and waste of energy is large.Therefore, oil pump energy-saving potentiality are very huge, and petroleum industry is also to promote the key industry of energy-saving of motor system.
Oil pumper belongs to potential energy loading high, especially, in the time that counterweight is uneven, in a stroke cycle of oil pumper, can make motor in generating state.Motor is due to potential energy or inertia, and its rotating speed can exceed synchronous speed, and regenerated energy, by the rectified action of the fly-wheel diode in parallel with frequency converter inverter bridge device for power switching IGBT, feeds back to DC bus.Due to the frequency converter of two common quadrants, its bus is to power by general-purpose diode rectifier bridge, can not, to electrical network feedback voltage, can only busbar voltage be raise to filter capacitor charging so feed back to the regenerated energy of DC bus.Frequency converter, in the time of design, for protection device, can arrange a bus overvoltage protection, in the time that bus voltage value arrives certain value, can trigger this and protect the device in frequency converter.So regenerated energy can be charged to busbar voltage the overpressure value of setting, can protect shutdown.
Generally, processing the traditional way of oil pumper regenerated energy is generally to adopt two quadrant frequency converter and the brake units of not controlling rectification, the scheme that brake resistance is combined with, each inversion unit has rectification link, DC link and inversion link, and rectification link is generally does not control diode rectifier structure, this mode is in busbar voltage and brake unit and brake resistance, energy is directly consumed in brake resistance, the shortcoming of this way is that feedback energy is fallen by resistance consumption, to energy-conservation unfavorable, and the harmonic current of grid side is larger, power factor is low.Meanwhile, every oil pumper is joined a transformer and frequency converter, and each frequency converter has rectification link, for many oil pumpers nearer occasion apart, and the wasting of resources, system cost increases.
Summary of the invention
The invention provides a kind of oil pumper multimachine drive unit based on common DC bus, solve existing oil pumper and drive frequency converting and energy saving device power factor low, harmonic current is large, the technical problem of the not energy-conservation problem of dynamic braking.
The technical scheme that the present invention solves the problems of the technologies described above is as follows: a kind of oil pumper multimachine drive unit based on common DC bus, comprises the integrated PWM rectifier of front end and back-end processing device; The integrated PWM rectifier of described front end is sent described electrical network back to for the alternating current of electrical network is converted to direct current or the regenerated energy of motor is converted to electric energy; The DC powered motor load of described back-end processing device for integrated described front end PWM rectifier is exported; Described back-end processing device comprises short-circuit protection and buffer unit, inverter; the input of described short-circuit protection and buffer unit is electrically connected with the output of the integrated PWM rectifier of described front end; the output of described short-circuit protection and buffer unit is electrically connected with the input of described inverter, and the output of described inverter is electrically connected with the input of described motor load.
The invention has the beneficial effects as follows: low for having solved in prior art power factor, harmonic current is large the problem that dynamic braking is not energy-conservation, and solved many oil pumpers at a distance of nearer occasion, also higher problem of cost.
Further: described protection and buffer unit comprise DC circuit breaker, fuse (FU4, FU5; FU6, FU7), contactor, power resistor, the input of described DC circuit breaker is electrically connected with the output of the integrated PWM rectifier of described front end, the output of described DC circuit breaker is through described fuse (FU4, FU5; FU6, FU7) be electrically connected with the input of described power resistor, the output of described power resistor is electrically connected with the input of described inverter, and described contactor and described power resistor are connected in parallel; Described back-end processing device is at least made as two, and a described back-end processing device is only electrically connected with a described motor load.
Further: the integrated PWM rectifier of described front end comprises the first fuse, the first circuit breaker Q F, the first contactor K1, the first reactor and PWM rectifier; The input of described the first fuse is electrically connected with described electrical network; The output of described the first fuse is electrically connected with the input of described the first circuit breaker Q F; The output of described the first circuit breaker Q F is electrically connected with the input of described the first contactor K1; The output of described the first contactor K1 is electrically connected with described the first reactor input, upper the first power resistor in parallel of described the first contactor K1; The output of described the first reactor is electrically connected with described PWM rectifier input; Described PWM rectifier output end is electrically connected with the described DC circuit breaker input in each described back-end processing device.
Brief description of the drawings
Fig. 1 is the structural representation of the first embodiment of the present invention;
Fig. 2 is the structural representation of the second embodiment of the present invention;
Fig. 3 is the integrated PWM rectifier structure of the front end of second embodiment of the present invention schematic diagram;
Fig. 4 is the first back-end processing apparatus structure schematic diagram of the second embodiment of the present invention;
Fig. 5 is the second back-end processing apparatus structure schematic diagram of the second embodiment of the present invention.
In accompanying drawing, the list of parts of each label representative is as follows:
10, electrical network, 20, transformer, 30, PWM rectifier; 40, inverter, 50, oil pumper, 1, electrical network; 1.1, the first power resistor, 1.2, the first reactor, 1.3, PWM rectifier; 2, the output of inverter; 2.1, short-circuit protection and buffer unit, 2.2, inverter, 3, the output of inverter; 3.1, short-circuit protection and buffer unit, 3.2, inverter.
Embodiment
Below in conjunction with accompanying drawing, principle of the present invention and feature are described, example, only for explaining the present invention, is not intended to limit scope of the present invention.
As shown in Figure 1, the structural representation of the first embodiment of the present invention, low for solving power factor, harmonic current is large, the problem that dynamic braking is not energy-conservation, for beam pumping unit, can adopt the four-quadrant frequency converter scheme of PWM rectification, transformer 20, PWM rectifier 30, inverter 40, oil pumper 50 are connected in series; Every oil pumper 05 configures a four-quadrant frequency converter.This scheme is owing to having adopted PWM rectifier 30, and oil pumper 50 is in the time of generating state, and electric energy can feed back to electrical network 10 by PWM rectifier 30, and the harmonic current that has solved electrical network 10 sides while not controlling rectification is larger, wastes the problems such as serious when dynamic braking.But this scheme does not still solve for many oil pumpers at a distance of nearer occasion, also higher problem of cost.
For solving limitation and the defect of such scheme, following proposal provides the oil pumper multimachine drive unit of a kind of system and device that can realize energy feedback, the harmonic pollution that reduces power supply, High Power Factor, general DC busbar-based on common DC bus.
As described in Fig. 2, Fig. 3, the structural representation of the second embodiment of the present invention, is the oil pumper multimachine drive unit based on common DC bus, and it comprises the integrated PWM rectifier of front end and back-end processing device; The integrated PWM rectifier of described front end is for by electrical network 1(three-phase alternating current) alternating current be converted to direct current and be transported on common DC bus or the regenerated energy of motor is converted to electric energy and send described electrical network 1 back to; The DC powered motor load of described back-end processing device for integrated described front end PWM rectifier is exported.Described back-end processing device is at least made as two, and a described back-end processing device is only electrically connected with a described motor load.This example adopts two back-end processing devices: the first back-end processing device and the second back-end processing device.
As shown in Figure 3, the integrated PWM rectifier of described front end comprises the first fuse, the first circuit breaker Q F, the first contactor K1, the first reactor 1.2 and PWM rectifier 1.3; The input of described the first fuse is electrically connected with described electrical network 1; The output of described the first fuse is electrically connected with the input of described the first circuit breaker Q F; The output of described the first circuit breaker Q F is electrically connected with the input of described the first contactor K1; The output of described the first contactor K1 is electrically connected with described the first reactor 1.2 inputs, upper the first power resistor 1.1 in parallel of described the first contactor K1; The output of described the first reactor 1.2 is electrically connected with described PWM rectifier 1.3 inputs; Described PWM rectifier 1.3 outputs are electrically connected with the described DC circuit breaker input in each described back-end processing device.The first fuse comprises: fuse FU1, fuse FU2, fuse FU3; The first power resistor 1.1 comprises resistance R 1, resistance R 2, resistance R 3; The first reactor 1.2 comprises reactance L1, reactance L2, reactance L3.The IGBT commutation technique that PWM rectifier 1.3 adopts PWM to control, completes the two-way control to rectification and feedback, has solved the regenerative electric power energy process problem when loading on fast-descending or shutting down.In the time that PWM rectifier 1.3 is in rectification state, interchange input electricity on electrical network 1 is converted to direct current and sends on common DC bus.In the time that PWM rectifier 1.3 is in regenerating condition, the regenerated energy dress of motor is changed to power delivery telegram in reply net 1.
As shown in Figure 4, described the first back-end processing device comprises short-circuit protection and buffer unit 2.1, inverter 2.2, the input of described short-circuit protection and buffer unit 2.1 is electrically connected with the output (common DC bus) of the integrated PWM rectifier of described front end, the output of described short-circuit protection and buffer unit 2.1 is electrically connected with the input of described inverter 2.2, and the output 2 of described inverter 2.2 is electrically connected with the input of described motor load, described protection and buffer unit 2.1 comprise DC circuit breaker QF2, fuse FU4, fuse FU5, contactor K2, power resistor R4, described DC circuit breaker QF2(DC circuit breaker QF2 plays the effect of control, can inverter 2.2 be switched in Common DC Profibus Control System in good time, and can work as when inverter 2.2 breaks down from Common DC Profibus Control System, cut out and repair or replace) input be electrically connected with the output (common DC bus) of the integrated PWM rectifier of described front end, the output of described DC circuit breaker QF2 is through described fuse FU4, fuse FU5(fuse FU4, fuse FU5 is just arranged at respectively on common DC bus, in negative busbar, when a frequency converter in Common DC Profibus Control System breaks down when causing device short circuit or puncturing, easily there is security incident, affect the operation of whole system, just, the negative busbar fuse of connecting respectively, can prevent that fault from further expanding, ensure the safety of common bus system) be arranged on the positive bus-bar on common DC bus with described power resistor R4(power resistor R4) input be electrically connected, the output of described power resistor R4 is electrically connected with the input of described inverter 2.2, described contactor K2 and described power resistor R4 are connected in parallel.
As shown in Figure 5, described the second back-end processing device comprises short-circuit protection and buffer unit 3.1, inverter 3.2, the input of described short-circuit protection and buffer unit 3.1 is electrically connected with the output (common DC bus) of the integrated PWM rectifier of described front end, the output of described short-circuit protection and buffer unit 3.1 is electrically connected with the input of described inverter 3.2, and the output 3 of described inverter 3.2 is electrically connected with the input of described motor load, described protection and buffer unit 3.1 comprise DC circuit breaker QF3, fuse FU6, fuse FU7, contactor K3, power resistor R5, described DC circuit breaker QF3(DC circuit breaker QF3 plays the effect of control, can inverter 3.2 be switched in Common DC Profibus Control System in good time, and can work as when inverter 3.2 breaks down from Common DC Profibus Control System, cut out and repair or replace) input be electrically connected with the output (common DC bus) of the integrated PWM rectifier of described front end, the output of described DC circuit breaker QF3 is through described fuse FU6, fuse FU7(fuse FU6, fuse FU7 is just arranged at respectively on common DC bus, in negative busbar, when a frequency converter in Common DC Profibus Control System breaks down when causing device short circuit or puncturing, easily there is security incident, affect the operation of whole system, just, the negative busbar fuse of connecting respectively, can prevent that fault from further expanding, ensure the safety of common bus system) be arranged on the positive bus-bar on common DC bus with described power resistor R5(power resistor R5) input be electrically connected, the output of described power resistor R5 is electrically connected with the input of described inverter 3.2, described contactor K3 and described power resistor R5 are connected in parallel.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (3)
1. the oil pumper multimachine drive unit based on common DC bus, is characterized in that: comprise the integrated PWM rectifier of front end and back-end processing device;
The integrated PWM rectifier of described front end is sent described electrical network (1) back to for the alternating current of electrical network (1) is converted to direct current or the regenerated energy of motor is converted to electric energy;
The DC powered motor load of described back-end processing device for integrated described front end PWM rectifier is exported;
Described back-end processing device comprises short-circuit protection and buffer unit (2.1; 3.1), inverter (2.2; 3.2), described short-circuit protection and buffer unit (2.1; 3.1) input is electrically connected with the output of the integrated PWM rectifier of described front end, described short-circuit protection and buffer unit (2.1; 3.1) output and described inverter (2.2; 3.2) input electrical connection, described inverter (2.2; 3.2) output (2; 3) be electrically connected with the input of described motor load.
2. the oil pumper multimachine drive unit based on common DC bus, is characterized in that: described protection and buffer unit (2.1; 3.1) comprise DC circuit breaker (QF2; QF3), fuse (FU4, FU5; FU6, FU7), contactor (K2; K3), power resistor (R4; R5), described DC circuit breaker (QF2; QF3) input is electrically connected with the output of the integrated PWM rectifier of described front end, described DC circuit breaker (QF2; QF3) output is through described fuse (FU4, FU5; FU6, FU7) and described power resistor (R4; R5) input electrical connection, described power resistor (R4; R5) output and described inverter (2.2; 3.2) input electrical connection, described contactor (K2; K3) with described power resistor (R4; R5) be connected in parallel; Described back-end processing device is at least made as two, and a described back-end processing device is only electrically connected with a described motor load.
3. the oil pumper multimachine drive unit based on common DC bus according to claim 2, is characterized in that: the integrated PWM rectifier of described front end comprises the first fuse, the first circuit breaker Q F, the first contactor K1, the first reactor (1.2) and PWM rectifier (1.3); The input of described the first fuse is electrically connected with described electrical network (1); The output of described the first fuse is electrically connected with the input of described the first circuit breaker Q F; The output of described the first circuit breaker Q F is electrically connected with the input of described the first contactor K1; The output of described the first contactor K1 is electrically connected with described the first reactor (1.2) input, upper the first power resistor in parallel (1.1) of described the first contactor K1; The output of described the first reactor (1.2) is electrically connected with described PWM rectifier (1.3) input; Described PWM rectifier (1.3) output is electrically connected with the described DC circuit breaker input in each described back-end processing device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410138702.6A CN103956942A (en) | 2014-04-04 | 2014-04-04 | Device for driving multiple pumping units based on common direct current bus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410138702.6A CN103956942A (en) | 2014-04-04 | 2014-04-04 | Device for driving multiple pumping units based on common direct current bus |
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| CN103956942A true CN103956942A (en) | 2014-07-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410138702.6A Pending CN103956942A (en) | 2014-04-04 | 2014-04-04 | Device for driving multiple pumping units based on common direct current bus |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106786728A (en) * | 2015-11-19 | 2017-05-31 | 中国石油化工股份有限公司 | A kind of energy storage environment-friendly type oil pumper distribution system |
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| CN203119770U (en) * | 2012-12-21 | 2013-08-07 | 北京天弈谷能源技术有限公司 | Multi-motor-driving frequency-converting and energy-saving device based on common DC bus and pumping unit |
| CN103427729A (en) * | 2012-05-17 | 2013-12-04 | 中国石油化工股份有限公司 | Rod pumped well group control system based on direct current bus |
| CN203482141U (en) * | 2013-10-18 | 2014-03-12 | 薛胜东 | Inverting control device special for centralized control of oil pumping unit well |
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2014
- 2014-04-04 CN CN201410138702.6A patent/CN103956942A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201525701U (en) * | 2009-09-16 | 2010-07-14 | 深圳市库马克新技术股份有限公司 | Intelligent speed regulation and control device of crown block |
| CN103427729A (en) * | 2012-05-17 | 2013-12-04 | 中国石油化工股份有限公司 | Rod pumped well group control system based on direct current bus |
| CN203119770U (en) * | 2012-12-21 | 2013-08-07 | 北京天弈谷能源技术有限公司 | Multi-motor-driving frequency-converting and energy-saving device based on common DC bus and pumping unit |
| CN203482141U (en) * | 2013-10-18 | 2014-03-12 | 薛胜东 | Inverting control device special for centralized control of oil pumping unit well |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106786728A (en) * | 2015-11-19 | 2017-05-31 | 中国石油化工股份有限公司 | A kind of energy storage environment-friendly type oil pumper distribution system |
| CN106786728B (en) * | 2015-11-19 | 2020-08-11 | 中国石油化工股份有限公司 | Energy-storage environment-friendly pumping unit power distribution system |
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