CN203119770U - Multi-motor-driving frequency-converting and energy-saving device based on common DC bus and pumping unit - Google Patents
Multi-motor-driving frequency-converting and energy-saving device based on common DC bus and pumping unit Download PDFInfo
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- CN203119770U CN203119770U CN201220715162XU CN201220715162U CN203119770U CN 203119770 U CN203119770 U CN 203119770U CN 201220715162X U CN201220715162X U CN 201220715162XU CN 201220715162 U CN201220715162 U CN 201220715162U CN 203119770 U CN203119770 U CN 203119770U
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Abstract
The utility model provides a multi-motor-driving frequency-converting and energy-saving device based on a common DC bus and a pumping unit. The multi-motor-driving frequency-converting and energy-saving device based on the common DC bus includes a power grid, a voltage transformer, an integrated PWM rectifying device, the common DC bus, more than one inverting device and more than one motor being driven. Three-phase AC current output by the power grid is connected to an input terminal of the voltage transformer. An output terminal of the voltage transformer is connected to an input terminal of the integrated PWM rectifying device. An output terminal of the integrated PWM rectifying device is connected to an input terminal of the common DC bus. An output terminal of the common DC bus is connected to input terminals of the inverting devices. Output terminals of inverting devices are connected to an input terminal of the only one among the motors. By using the multi-motor-driving frequency-converting and energy-saving device based on the common DC bus provided by the utility model, an energy regeneration problem of an electric motor caused by large starting torque, low operation load, high voltage transformer configuration capacity and upstream-downstream unbalance of a prior pumping unit is solved, and an aim of saving energy is realized. At the same time, power factors are increased, systematic reliability is improved and the systematic cost is reduced.
Description
Technical field
The utility model relates to a kind of frequency converting and energy saving device, is specifically related to a kind of multimachine based on common DC bus and drives frequency converting and energy saving device and oil pumper.
Background technology
Beam pumping unit has another name called the machine of kowtowing, and belongs to a kind of oil pumping unit of extensive use in the oilfield exploitation field.At present, oil pumper has that operational efficiency is low, power factor is low and problem such as waste of energy is big, and for example, the power consumption of oil pumper accounts for 40% of oil field total electricity consumption, and its average operating efficiency has only about 25%.Therefore, how effectively to improve the operational efficiency of oil pumper, the power consumption that reduces oil pumper belongs to the emphasis direction of petroleum industry research, directly influences the energy-saving effect of petroleum industry integral body.
In the prior art, the motor of oil pumper connects two quadrant frequency converters usually, concrete, two quadrant frequency converters adopt diode rectifier bridge to convert direct current to from the alternating current of electrical network, adopt the IGBT inversion transformation technique that direct current is changed into all adjustable alternating current of electric voltage frequency then, and then the control alternating current motor.
And for oil pumper, because oil pumper belongs to the potential energy load, especially when counterweight is uneven,, the motor rotor rotating speed can occurs greater than the situation of the synchronous speed of motor, thereby make motor become generating state in the cycle at a stroke of oil pumper work.The feedback energy of motor that is in generating state is very high, can cause that the major loop DC bus-bar voltage raises, and can cause the frequency converter can't operate as normal when the major loop DC bus-bar voltage is too high.
Because two quadrant frequency converters adopt diode rectifier bridge, can't realize the two-way flow of energy, so do not have the function of the motor feedback energy being sent back to electrical network.At present, for solving the energy feedback problem of motor, adopt following method usually: as shown in Figure 1, at the intermediate dc link increase braking power consumption resistance of frequency converter, by the energy of braking power consumption resistance consumption power down motivation feedback.
Mainly there is following problem in said method: the diode rectifier bridge that (1) two quadrant frequency converter adopts can produce serious harmonic pollution to electrical network, has reduced power factor; (2) feedback energy be braked the power consumption resistance directly consume, wasted electric energy; (3) every oil pumper all needs to dispose a transformer and a frequency converter, and each frequency converter has the rectification link, at a distance of nearer occasion, has wasted system resource for many oil pumpers, has increased system cost.
The utility model content
At the defective that prior art exists, the utility model provides a kind of multimachine based on common DC bus to drive frequency converting and energy saving device and oil pumper, can take full advantage of the feedback energy of motor, reaches energy-conservation purpose; Also improve the reliability of power factor, system simultaneously and reduced system cost.
The technical solution adopted in the utility model is as follows:
The utility model provides a kind of multimachine based on common DC bus to drive frequency converting and energy saving device, comprises power supply grid, transformer, integrated PWM rectifying device, common DC bus, above inverter and driven motor more than; The three-phase alternating current of described power supply grid output is electrically connected to the input of described transformer; The output of described transformer is connected to the input of described integrated PWM rectifying device; The output of described integrated PWM rectifying device is connected to the input of described common DC bus; The output of described common DC bus is connected respectively to the input of the above inverter; The input of a described motor of the unique connection of the output of every described inverter.
Preferably, described integrated PWM rectifying device comprises fuse, the circuit breaker of series connection, the buffer circuit that powers on, contactor, input filter reactor and PWM rectifier; And described contactor is parallel with pre-charge resistance.
Preferably, described PWM rectifier is the controllable IGBT rectification circuit of PWM pulse-width modulation.
Preferably, described inverter comprises short-circuit protection circuit, buffer circuit and the inverter of series connection.
Preferably, described short-circuit protection circuit comprises circuit breaker and the fuse of series connection.
Preferably, described short-circuit protection circuit is two-way, comprises first short-circuit protection circuit and second short-circuit protection circuit; Described first short-circuit protection circuit is connected with the positive bus-bar of described common DC bus, and described second short-circuit protection circuit is connected with the negative busbar of described common DC bus.
The utility model provides a kind of oil pumper, comprises that the above-mentioned multimachine based on common DC bus drives frequency converting and energy saving device.
The beneficial effects of the utility model are as follows:
The utility model provides a kind of multimachine based on common DC bus to drive frequency converting and energy saving device and oil pumper, have the following advantages: four-quadrant frequency converter of (1) every oil pumper configuration, when motor is in generating state, feedback energy can feed back to electrical network by the PWM rectifier, thereby taken full advantage of feedback energy, reached energy-conservation purpose; Simultaneously also reduce the harmonic pollution of feedback electric current to grid side, improved the reliability of power factor and system; (2) when using many oil pumpers, each oil pumper is the separate configurations inverter separately, but shares rectifying device, thereby has reduced system cost.
Description of drawings
The structural representation of the oil pumper drive unit that Fig. 1 provides for prior art;
Fig. 2 drives the structural representation of frequency converting and energy saving device for what the utility model provided based on the multimachine of common DC bus;
The structural representation of the integrated PWM rectifying device that Fig. 3 provides for the utility model;
The structural representation of the inverter of two motor of connection of the common dc bus that Fig. 4 provides for the utility model;
The structural representation of the inverter of a motor of connection of the common dc bus that Fig. 5 provides for the utility model;
Wherein, 1---common DC bus; 2---short-circuit protection and buffer unit; The 3---inverter.
Embodiment
Below in conjunction with accompanying drawing the utility model is elaborated:
As shown in Figure 2, the utility model provides a kind of multimachine based on common DC bus to drive frequency converting and energy saving device, comprises power supply grid, transformer, integrated PWM rectifying device, common DC bus, above inverter and driven motor more than; The three-phase alternating current of described power supply grid output is electrically connected to the input of described transformer; The output of described transformer is connected to the input of described integrated PWM rectifying device; The output of described integrated PWM rectifying device is connected to the input of described common DC bus; The output of described common DC bus is connected respectively to the input of the above inverter; The input of a described motor of the unique connection of the output of every described inverter.
As shown in Figure 3, integrated PWM rectifying device comprises fuse, the circuit breaker of series connection, the buffer circuit that powers on, contactor, input filter reactor and PWM rectifier; And described contactor is parallel with pre-charge resistance.Wherein, the PWM rectifier is the IGBT rectification circuit of PWM control.Because the PWM rectifier that the utility model adopts is the IGBT rectification circuit of PWM control, have the two-way control of rectification and feedback, therefore, when rectifier is in rectification state, will exchanges and import electricity and be converted to direct current and send on the common DC bus; When rectifier is in regenerating condition, the regenerated energy of motor is converted to power delivery telegram in reply net.
Shown in Fig. 4-5, inverter comprises short-circuit protection circuit, buffer circuit and the inverter of series connection.Wherein, short-circuit protection circuit comprises circuit breaker and the fuse of series connection.In addition, short-circuit protection circuit is two-way, comprises first short-circuit protection circuit and second short-circuit protection circuit; Described first short-circuit protection circuit is connected with the positive bus-bar of described common DC bus, and described second short-circuit protection circuit is connected with the negative busbar of described common DC bus.In Fig. 5, first short-circuit protection circuit is circuit breaker Q F2 and fuse FU4; Second short-circuit protection circuit is circuit breaker Q F3 and fuse FU5; Buffer circuit is R4 and K2 in parallel.Be total to DC bus system for many frequency converters, when breaking down, a frequency converter in the common bus system causes the device short circuit or when puncturing, security incident appears easily, influence the operation of whole system, therefore, in the utility model, further enlarge for preventing fault, guarantee the safety of common bus system, at the positive and negative bus fuse of connecting respectively.Wherein circuit breaker Q F2 plays the effect of control, can inverter be switched in the common bus system in good time, and have when inverter breaks down, and cuts out the function of fault inverter from the common bus system.
The operation principle that the multimachine based on common DC bus that the utility model provides drives frequency converting and energy saving device is:
When motor is in the work done state, after the three-phase current process power transformation device transformation of electrical network output, be input to integrated PWM rectifying device; Integrated PWM rectifying device outputs to common DC bus after the three-phase current rectification is direct current; After the inverter effect, be converted to alternating current from the direct current of common DC bus output, thereby power for motor.And when motor was in generating state, the energy that motor produces fed back to electrical network by the path with above-mentioned completely reversibility, reached the purpose that takes full advantage of the electromotor feedback energy.
The utility model also provides a kind of above-mentioned oil pumper that drives frequency converting and energy saving device based on the multimachine of common DC bus of using.
In sum, the multimachine based on common DC bus that the utility model provides drives frequency converting and energy saving device and oil pumper, have the following advantages: four-quadrant frequency converter of (1) every oil pumper configuration, when motor is in generating state, feedback energy can feed back to electrical network by the PWM rectifier, thereby taken full advantage of feedback energy, reached energy-conservation purpose; Simultaneously also reduce the harmonic pollution of feedback electric current to grid side, improved the reliability of power factor and system; (2) when using many oil pumpers, each oil pumper is the separate configurations inverter separately, but shares rectifying device, thereby has reduced system cost.
The above only is preferred implementation of the present utility model; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be looked protection range of the present utility model.
Claims (7)
1. one kind drives frequency converting and energy saving device based on the multimachine of common DC bus, it is characterized in that, comprises power supply grid, transformer, integrated PWM rectifying device, common DC bus, above inverter and driven motor more than; The three-phase alternating current of described power supply grid output is electrically connected to the input of described transformer; The output of described transformer is connected to the input of described integrated PWM rectifying device; The output of described integrated PWM rectifying device is connected to the input of described common DC bus; The output of described common DC bus is connected respectively to the input of the above inverter; The input of a described motor of the unique connection of the output of every described inverter.
2. the multimachine based on common DC bus according to claim 1 drives frequency converting and energy saving device, it is characterized in that described integrated PWM rectifying device comprises fuse, the circuit breaker of series connection, the buffer circuit that powers on, contactor, input filter reactor and PWM rectifier; And described contactor is parallel with pre-charge resistance.
3. the multimachine based on common DC bus according to claim 2 drives frequency converting and energy saving device, it is characterized in that described PWM rectifier is the controllable IGBT rectification circuit of PWM pulse-width modulation.
4. the multimachine based on common DC bus according to claim 1 drives frequency converting and energy saving device, it is characterized in that described inverter comprises short-circuit protection circuit, buffer circuit and the inverter of series connection.
5. the multimachine based on common DC bus according to claim 4 drives frequency converting and energy saving device, it is characterized in that described short-circuit protection circuit comprises circuit breaker and the fuse of series connection.
6. the multimachine based on common DC bus according to claim 4 drives frequency converting and energy saving device, it is characterized in that described short-circuit protection circuit is two-way, comprises first short-circuit protection circuit and second short-circuit protection circuit; Described first short-circuit protection circuit is connected with the positive bus-bar of described common DC bus, and described second short-circuit protection circuit is connected with the negative busbar of described common DC bus.
7. an oil pumper is characterized in that, comprises that each described multimachine based on common DC bus of claim 1-6 drives frequency converting and energy saving device.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220715162XU CN203119770U (en) | 2012-12-21 | 2012-12-21 | Multi-motor-driving frequency-converting and energy-saving device based on common DC bus and pumping unit |
| CN201210559986.7A CN103887988A (en) | 2012-12-21 | 2012-12-21 | Multi-motor-driving frequency-converting energy-saving device based on common DC bus and pumping unit |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220715162XU CN203119770U (en) | 2012-12-21 | 2012-12-21 | Multi-motor-driving frequency-converting and energy-saving device based on common DC bus and pumping unit |
| CN201210559986.7A CN103887988A (en) | 2012-12-21 | 2012-12-21 | Multi-motor-driving frequency-converting energy-saving device based on common DC bus and pumping unit |
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| Publication Number | Publication Date |
|---|---|
| CN203119770U true CN203119770U (en) | 2013-08-07 |
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| CN201220715162XU Expired - Fee Related CN203119770U (en) | 2012-12-21 | 2012-12-21 | Multi-motor-driving frequency-converting and energy-saving device based on common DC bus and pumping unit |
| CN201210559986.7A Pending CN103887988A (en) | 2012-12-21 | 2012-12-21 | Multi-motor-driving frequency-converting energy-saving device based on common DC bus and pumping unit |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210559986.7A Pending CN103887988A (en) | 2012-12-21 | 2012-12-21 | Multi-motor-driving frequency-converting energy-saving device based on common DC bus and pumping unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103956942A (en) * | 2014-04-04 | 2014-07-30 | 合康变频科技（武汉）有限公司 | Device for driving multiple pumping units based on common direct current bus |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104767391A (en) * | 2015-04-21 | 2015-07-08 | 贾晓宏 | Controllable frequency converter |
| CN111052582B (en) * | 2017-09-14 | 2023-08-29 | 西门子股份公司 | Frequency converter, frequency converter assembly and control method of frequency converter assembly |
| CN110943674A (en) * | 2019-12-25 | 2020-03-31 | 北京达睿企科技有限公司 | Rectifier and low-voltage inverter array power supply system |
| US11955782B1 (en) | 2022-11-01 | 2024-04-09 | Typhon Technology Solutions (U.S.), Llc | System and method for fracturing of underground formations using electric grid power |
-
2012
- 2012-12-21 CN CN201220715162XU patent/CN203119770U/en not_active Expired - Fee Related
- 2012-12-21 CN CN201210559986.7A patent/CN103887988A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103956942A (en) * | 2014-04-04 | 2014-07-30 | 合康变频科技（武汉）有限公司 | Device for driving multiple pumping units based on common direct current bus |
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| Publication number | Publication date |
|---|---|
| CN103887988A (en) | 2014-06-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: HICONICS DRIVE TECHNOLOGY CO., LTD. Effective date: 20140212 |
|
| CB03 | Change of inventor or designer information |
Inventor after: Jiang Xianglong Inventor after: Guo Zhengang Inventor before: Guo Zhengang Inventor before: Ma Ning |
|
| CB03 | Change of inventor or designer information | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: GUO ZHENGANG MA NING TO: JIANG XIANGLONG GUO ZHENGANG |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20140212 Address after: 1109, room 100085, block A, No. 22 information road, Beijing, Haidian District Patentee after: Beijing Techeasy Energy Technology Co., Ltd. Patentee after: Hop Technology (Wuhan) Co., Ltd. Address before: 1109, room 100085, block A, No. 22 information road, Beijing, Haidian District Patentee before: Beijing Techeasy Energy Technology Co., Ltd. |
|
| TR01 | Transfer of patent right | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130807 Termination date: 20131221 |