CN207081818U - A kind of common DC bus frequency control pilot system - Google Patents
A kind of common DC bus frequency control pilot system Download PDFInfo
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- CN207081818U CN207081818U CN201720878712.2U CN201720878712U CN207081818U CN 207081818 U CN207081818 U CN 207081818U CN 201720878712 U CN201720878712 U CN 201720878712U CN 207081818 U CN207081818 U CN 207081818U
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Abstract
A kind of common DC bus frequency control pilot system, including power frequency AC, the input connection power frequency AC of rectifier transformer, and its output end connection Active Front End rectification module；The Active Front End rectification module rectification output end forms common DC bus and produces DC bus-bar voltage；First, second inversion unit is connected with dc bus simultaneously；The first inversion unit output end connection subject frequency control AC asynchronous motor, the connection drive motor of the second inversion unit output end；And the output shaft for being tested frequency control AC asynchronous motor and drive motor is connected by shaft coupling.The utility model in laboratory according to concerned countries standard, can complete the pattern and delivery test of the frequency control AC asynchronous motor of all kinds and specification.
Description
Technical field
Frequency control AC asynchronous motor Test And Check Technology field is the utility model is related to, refers specifically to a kind of direct current altogether
Bus frequency control pilot system.
Background technology
The buncher of early stage is more universal with DC speed regulation, and DC speed regulation be unable to do without direct current generator certainly.DC generator
Structure type is complicated, and manufacturing process is relatively complicated, and cost is of a relatively high.Secondly, direct current generator is due to there is a reversing arrangement, during operation
The problems such as commutation spark, brush wear also be present, later stage regular maintenance is relatively difficult, is substituted at present by AC speed regulating.
With the rapid development of Power Electronic Technique and control technology so that AC speed regulating performance can mutually be equal to DC speed regulation performance
U.S., mutually compete.Especially, the structure of alternating current generator is simple, reliable, and AC power is easily solved so that ac adjustable speed motor
Application in each field is more and more extensive.
For frequency control AC asynchronous motor at present from the point of view of the applicable cases of market, the speed adjustable range of motor is more and more wider,
The basic, normal, high pressure of voltage class has.Its performance mainly include no-load characteristic, load characteristic, efficiency, temperature rise, vibration, noise,
Added losses etc. are tested.Traditional experiment unit is used for completing to test the part that still comes with some shortcomings：
1 traditional experiment unit is all limited by intrinsic rotating speed, and experiment power supply tuning range is relatively small, it is difficult to is met wider
The frequency-adjustable speed-adjustable requirement of scope.
2 variable-frequency motors are typically powered using AC converter, and supply harmonic factor is larger, when service-test machine group is tested
Due to supply harmonic very little, the performance indications such as the electric efficiency measured, temperature rise, noise, added losses generally to be preferred over actual use
Environment, test result be present can not reflect the drawbacks such as actual condition strictly according to the facts.
3 traditional experiment units are limited by power network power frequency supply, for non-power frequency frequency control motor load characteristic, efficiency,
Temperature rise and power factor test, can only use constant voltage and frequency ratio Equivalent-Conversion Method to test, result of the test error is larger.
4 CN201520586704.1 disclose a kind of energy feedback type asynchronous machine test platform, it is characterized in that described accompany
Examination motor M2 be Wound-rotor type double-fed threephase asynchronous machine, energy feedback be using accompany examination motor M2 and the stators of tested motor M1 two around
A kind of group test mode in parallel.In place of system comes with some shortcomings：First, test system is by with examination motor M2 voltage class institute
Limit, testing of electric motors and the motor that voltage class of the same race and number of poles need to be typically selected with examination motor.Number of poles is different or voltage difference compared with
When big, rated voltage, speed adjustable range or feedback capacity can be all restricted.Second, require spy with examination motor
Different property, it is impossible to using conventional motor.Therefore, pilot system has certain limitation, it is impossible to adapts to all kinds and specification
Electromechanical testing.
Utility model content
The utility model proposes a kind of common DC bus frequency control pilot system, to solve the change of all kinds and specification
The type approval test of frequency modulation speed AC asynchronous motor and delivery test.
Technical scheme is used by the utility model：
A kind of common DC bus frequency control pilot system, including power frequency AC, the input of rectifier transformer connect
Power frequency AC is connect, and its output end connects Active Front End rectification module；The Active Front End rectification module rectification output end structure
DC bus-bar voltage is produced into common DC bus；First, second inversion unit is connected with dc bus simultaneously；Described first
Inversion unit output end connection subject frequency control AC asynchronous motor, the connection dragging of the second inversion unit output end are electronic
Machine；And the output shaft for being tested frequency control AC asynchronous motor and drive motor is connected by shaft coupling.
Further：
The Active Front End rectification module is fully-controlled type turn-off device IGCT, and control strategy uses frequency and voltage decoupling
Control model.
When the examination frequency control AC asynchronous motor is high-voltage motor, it increases between first inversion unit
First class boost transformer.
When the drive motor is high-voltage motor, it increases first class boost transformation between second inversion unit
Device.
The outer power frequency AC supplied of input connection of the rectifier transformer, and before the connection of its output end is active
Hold rectification module；The Active Front End rectification module rectification output end forms common DC bus and produces DC bus-bar voltage；Direct current
First, second inversion unit is connected with bus simultaneously；First inversion unit connects coupling transformer secondary input, should
Coupling transformer secondary output end connection subject frequency control AC asynchronous motor, second inversion unit connect the coupling
Close transformer primary side input.
The utility model can complete the frequency control of all kinds and specification in laboratory according to concerned countries standard
The pattern and delivery test of AC asynchronous motor.Specific benefit is as follows：
1. Active Front End rectification module of the present utility model（AFE）It is female for fully-controlled type turn-off device IGCT, control direct current
Line voltage is maintained at a certain constant set-point.Rectifier cell gate pole trigger pulse uses sinusoidal pulse width modulation pattern（SPWM）,
Active Front End is filtered equipped with LCL and energy storage link, and making AC input current, harmonic wave is dirty to caused by power network closer to sine wave
Dye can accomplish very little.
2. Active Front End rectification module（AFE）Both rectifier system work can be made, can also make inverting work, it is possible to achieve
Energy regeneration is braked, and energy-saving effect is fine, easy to use, without special dynamic braking link.
3. during load test, energy test variable-frequency control asynchronous motor, drive motor and two inversion units and
Closed loop feedback is formed between dc bus, experiment advantageously reduces energy consumption.
4. Active Front End rectification module（AFE）Only need to provide pilot system loss supplement, without considering reactive power.As long as
Meet delivery test capacity requirement, the parameter matching of rectifier transformer and rectification module power device is typically compared with the inversion list of rear class
Appearance configuration can drop in member, reduce equipment investment cost.
5. two sets of inversion unit power models of the present utility model are fully-controlled type turn-off device IGCT, control strategy uses
Frequency and voltage decoupling control model, facilitate experiment power supply frequency and voltage separately adjustable, are adapted to different voltage class, pole
Number and the motor test of rated frequency.
6. two sets of inversion unit output ends configuration stage transformer boosting of the present utility model, can complete high voltage variable frequency modulation
The pattern and delivery test of fast AC asynchronous motor.
7. two sets of inversion unit frequencies of the present utility model, voltage decoupling control, two inversion unit inverters wherein one
Set do main power source, it is another set of do auxiliary power, the major and minor power supply of different frequency can carry out frequency conversion by transformer electromagnetic coupled
The folded frequency temperature rise test of speed governing alternating current asynchronous machine.
Brief description of the drawings
Fig. 1 is circuit diagram of the present utility model；
Fig. 2 is folded frequency temperature rise test circuit diagram of the present utility model.
Embodiment
The utility model is further described below in conjunction with accompanying drawing.
The utility model realizes that energy is two-way by one kind in Common DC Profibus Control System（Regeneration）The power of transmission turns
Changing device.Active Front End rectification module（AFE）, main power source alternating voltage and electric current are converted into DC voltage and electric current, electric energy
Common DC bus is sent to from ac main power.Dc bus connects two inversion units with capacity simultaneously（INU）, it is used for
To frequency control AC asynchronous motor and pull-over gear power supply and Power Control.Inversion unit is a kind of bidirectional, dc fed power
Inverter, by common DC bus Active Front End rectification module（AFE）Power supply.Energy feedback method, inversion are used during experiment
Unit is using frequency and voltage decoupling control strategy, it is convenient to the frequency and voltage of separately adjustable ac inverter, adapts to
The research and development and performance test of dispatching from the factory of the frequency control AC asynchronous motor of different frequency and voltage, examine properties of product whether full
Sufficient standard, technical conditions requirement.
As shown in figure 1, a kind of common DC bus frequency control pilot system, is powered by outer for power frequency AC 1, it is described
The outer input that rectifier transformer 2 is connected for power frequency AC 1, the output end of the rectifier transformer 2 connection Active Front End are whole
Flow module（AFE）3；The rectification output end of Active Front End rectification module 3 forms common DC bus and produces DC bus-bar voltage；
The first inversion unit is connected with dc bus simultaneously（INU）4 and second inversion unit（INU）5；First inversion unit 4 exports
End connection subject frequency control AC asynchronous motor 6, the connection drive motor 7 of the output end of the second inversion unit 5；The subject
Frequency control AC asynchronous motor 6 is connected with the output shaft of the drive motor 7 by shaft coupling.
It is connected to first, second inversion unit of common DC bus（INU）4th, 5, it can be needed according to experiment a set of only
Stand operation or two sets work simultaneously.
During a set of independent operating, no matter the first inversion unit 4 or the second inversion unit 5, be used equally for testing of electric motors
The unit project testing such as no-load characteristic, vibration, noise, hypervelocity, or it is electronic for carrying out the subject frequency control alternating current asynchronous
The delivery test of machine 6.Two sets when working simultaneously, two variable-frequency power sources of first, second inversion unit 4,5 output supply two classes
Type and the identical or different subject frequency control AC asynchronous motor 6 of specification, can complete two subjects simultaneously
The delivery test of frequency control AC asynchronous motor 6.If the subject frequency control AC asynchronous motor 6 drags with described
The output shaft of dynamic motor 7 is connected by shaft coupling, and first, second work simultaneously of inversion unit 4,5 is respectively the change frequency modulation
Fast AC asynchronous motor 6 and the drive motor 7 are powered, and form energy closed loop feedback system, can complete the negative of motor
Load, efficiency, temperature rise and power factor test.
If the subject frequency control AC asynchronous motor 6 is high-voltage motor, the output end of the first inversion unit 4
First class boost transformer can also be increased（Accompanying drawing 1 does not occur）, it is electronic that the subject frequency control alternating current asynchronous are reconnected after boosting
Machine 6.Equally, if the drive motor 7 is high-voltage motor, the output end of the second inversion unit 5 can also increase one-level liter
Pressure transformer（Accompanying drawing 1 does not occur）, the drive motor 7 is reconnected after boosting.
As shown in Fig. 2 the folded frequency temperature rise test structure of the utility model is：It is outer to connect rectifier transformer for power frequency AC 1
The input of device 2, the output end of the rectifier transformer 2 connection Active Front End rectification module 3, the Active Front End rectification module 3
Rectification output end forms common DC bus and produces DC bus-bar voltage；The first inversion unit 4 is connected with dc bus simultaneously
With the second inversion unit 5；First inversion unit 4 connects the secondary input of coupling transformer 8, and the coupling transformer 8 is secondary
Side output end connection subject frequency control AC asynchronous motor 6, it is former that second inversion unit 5 is connected to coupling transformer 8
Side input.
Test philosophy of the present utility model is as follows：
During experiment, the outer confession power frequency AC 1 is that rectifier transformer 2 provides power frequency supply, and the Active Front End is whole
Pre-charging device is configured with inside flow module 3, starts preliminary filling electrical circuit and is pre-charged to dc bus.The Active Front End rectification mould
The locking pulse of block 3, Active Front End rectification module 3 starts charging control logic after dc bus builds pressure, by DC bus-bar voltage
Improve to normal working voltage charging and terminate.
When being tested frequency control 6 unit project testing of AC asynchronous motor, the Active Front End rectification module 3 is operated in
Rectification mode, control DC bus-bar voltage is invariable, and AC power passes to the first inversion list of rear class through direct current conversion
Member 4, start the first inversion unit 4 and drive the subject frequency control AC asynchronous motor 6 progressively raising speed, according to test request
Control experiment supply frequency and voltage, the performance tests such as zero load, short circuit, vibration, noise, hypervelocity can be carried out.
When being tested the 6 load characteristic test of frequency control AC asynchronous motor, as shown in figure 1, the Active Front End rectification
Module 3 is operated in rectification mode, maintains DC bus-bar voltage constant, and AC power is mainly used to supplement rear class through direct current conversion
Energy loss.During experiment, the subject frequency control AC asynchronous motor 6 progressively raising speed is started by inversion unit 4 first, treated
After the subject frequency control AC asynchronous motor 6 reaches rated speed, rated voltage, the second inversion unit 5 is opened to dragging
Motor 7 applies power supply, and adjustment starts the out-put supply frequency of the second inversion unit 5 and voltage is equal to rated value.Then, the is reduced
The out-put supply frequency of two inversion unit 5, drive motor 7 is set progressively to load until subject frequency control AC asynchronous motor 6
Load current reaches rated value, and voltage keeps specified.It should be noted that under this operating condition, first inversion unit 4
Inverter mode is operated in, exports electric power, electric energy passes to subject frequency control AC asynchronous motor 6 and changes into machinery
Can, mechanical energy coaxially passes to drive motor 7 through output shaft, and drive motor 7 is operated in asynchronous generating state, in turn will
It is inverse to first through the rectified feedback of the second inversion unit 5 again to second inversion unit 5, electric energy that mechanical energy changes into electric energy feedback
Become unit 4.Therefore, in whole test process, energy the first inversion unit 4, subject frequency control AC asynchronous motor 6,
Drive motor 7, the second inversion unit 5 form closed loop feedback path, and only replenishment system loss is electric for Active Front End rectification module 3
Energy.Above pattern can be completed to be tested load, efficiency, temperature rise and power factor of frequency control AC asynchronous motor 6 etc.
Performance test.
As shown in Fig. 2 when subject frequency control AC asynchronous motor 6 folds frequency temperature rise test, operation principle and above-mentioned base
This is identical, except that, main power source is done with the inversion of the first inversion unit 4 output, secondary electricity is done in the inversion of the second inversion unit 5 output
Source, the major and minor power supply of two kinds of different frequencies obtain electromagnetic coupled superposition, the coupling transformation on the former and deputy side of coupling transformer 8
The secondary output end of device 8 connection subject frequency control AC asynchronous motor 6.During experiment, the voltage of main power source, the control of frequency are protected
The voltage of card subject frequency control AC asynchronous motor 6, frequency remain specified, and adjustment auxiliary power frequency is typically 0.7 ~ 0.85
The a certain Best Point operation of times rated frequency.It by adjusting auxiliary power voltage magnitude size, can hand over the subject frequency control
The load current of stream asynchronous motor 6 reaches rated value, reaches the mesh that testing of electric motors temperature rise test is realized with equivalent fuel factor method
's.
Claims (5)
1. a kind of common DC bus frequency control pilot system, including power frequency AC, it is characterised in that：Rectifier transformer
（2）Input connection power frequency AC（1）, and its output end connection Active Front End rectification module（3）；The Active Front End is whole
Flow module（3）Rectification output end forms common DC bus and produces DC bus-bar voltage；Be connected with first simultaneously on dc bus,
Second inversion unit（4、5）；First inversion unit（4）Output end connection subject frequency control AC asynchronous motor（6）,
Second inversion unit（5）Output end connects drive motor（7）；And it is tested frequency control AC asynchronous motor（6）With dragging
Motor（7）Output shaft connected by shaft coupling.
A kind of 2. common DC bus frequency control pilot system according to claim 1, it is characterised in that：It is described it is active before
Hold rectification module（3）For fully-controlled type turn-off device IGCT, control strategy is using frequency and voltage decoupling control model.
A kind of 3. common DC bus frequency control pilot system according to claim 1, it is characterised in that：
The examination frequency control AC asynchronous motor（6）For high-voltage motor when, itself and first inversion unit（4）Between increase
Add first class boost transformer.
A kind of 4. common DC bus frequency control pilot system according to claim 1, it is characterised in that：The dragging electricity
Motivation（7）For high-voltage motor when, itself and second inversion unit（5）Between increase first class boost transformer.
A kind of 5. common DC bus frequency control pilot system according to claim 1, it is characterised in that：The rectification becomes
Depressor（2）The outer power frequency AC supplied of input connection（1）, and its output end connection Active Front End rectification module
（3）；The Active Front End rectification module（3）Rectification output end forms common DC bus and produces DC bus-bar voltage；Dc bus
It is upper to be connected with first, second inversion unit simultaneously（4、5）；First inversion unit（4）Connect coupling transformer（8）Secondary is defeated
Enter end, the coupling transformer（8）Secondary output end connection subject frequency control AC asynchronous motor（6）, second inversion
Unit（5）Connect the coupling transformer（8）Primary side input.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720878712.2U CN207081818U (en) | 2017-07-19 | 2017-07-19 | A kind of common DC bus frequency control pilot system |
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| CN201720878712.2U CN207081818U (en) | 2017-07-19 | 2017-07-19 | A kind of common DC bus frequency control pilot system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109444745A (en) * | 2018-12-26 | 2019-03-08 | 河北工业大学 | A kind of squirrel cage asynchronous motor mechanical back to back test platform based on double PWM converter four quadrant runnings |
| CN111628660A (en) * | 2020-06-05 | 2020-09-04 | 浙江鲲悟科技有限公司 | Compressor variable frequency speed regulating system and control method of direct current bus voltage |
| CN112881911A (en) * | 2021-01-27 | 2021-06-01 | 哈动国家水力发电设备工程技术研究中心有限公司 | Variable-speed double-fed motor testing device |
| CN113517828A (en) * | 2021-06-03 | 2021-10-19 | 四川宏华电气有限责任公司 | Double-system oil rig electric drive system |
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2017
- 2017-07-19 CN CN201720878712.2U patent/CN207081818U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109444745A (en) * | 2018-12-26 | 2019-03-08 | 河北工业大学 | A kind of squirrel cage asynchronous motor mechanical back to back test platform based on double PWM converter four quadrant runnings |
| CN111628660A (en) * | 2020-06-05 | 2020-09-04 | 浙江鲲悟科技有限公司 | Compressor variable frequency speed regulating system and control method of direct current bus voltage |
| CN112881911A (en) * | 2021-01-27 | 2021-06-01 | 哈动国家水力发电设备工程技术研究中心有限公司 | Variable-speed double-fed motor testing device |
| CN112881911B (en) * | 2021-01-27 | 2022-09-09 | 哈动国家水力发电设备工程技术研究中心有限公司 | Variable-speed double-fed motor testing device |
| CN113517828A (en) * | 2021-06-03 | 2021-10-19 | 四川宏华电气有限责任公司 | Double-system oil rig electric drive system |
| CN113517828B (en) * | 2021-06-03 | 2023-12-15 | 四川宏华电气有限责任公司 | Dual-system electric driving system for petroleum drilling machine |
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