CN109039213A - A kind of Fly a car start method based on nine phase motor power frequency shear frequencies - Google Patents
A kind of Fly a car start method based on nine phase motor power frequency shear frequencies Download PDFInfo
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- CN109039213A CN109039213A CN201810650832.6A CN201810650832A CN109039213A CN 109039213 A CN109039213 A CN 109039213A CN 201810650832 A CN201810650832 A CN 201810650832A CN 109039213 A CN109039213 A CN 109039213A
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- frequency
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/047—V/F converter, wherein the voltage is controlled proportionally with the frequency
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
- H02P1/26—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual polyphase induction motor
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
- H02P25/22—Multiple windings; Windings for more than three phases
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor And Converter Starters (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The present invention provides a kind of Fly a car start method based on nine phase motor power frequency shear frequencies, include: Step 1: motor is switched to frequency conversion by power frequency after, one initial output voltage of motor in frequency converter rotation given first, while from rated frequency, gradually 0Hz is down on slope to the given frequency of frequency converter；Step 2: nine phase currents of the motor in detection rotation, carry out the transformation of 9s → 2r coordinate vector, resolution of vectors；Step 3: the frequency search inflection point of rotating electric machine judges；After the mould for detecting nine phase current resolutions of vectors is long " inflection point " occurs, then it represents that searched the speed of motor at this time；Step 4: frequency inflection point carries out converting operation after searching frequency success, output voltage is gone back up into frequency converter V/F curve corresponding " full scale " voltage under this frequency, output reaches the frequency conversion stable operation of motor, Fly a car start success to motor；It realizes nine phase motors and converting operation is directly cut by power frequency operation, and without waiting for the static process of motor.
Description
Technical field
The present invention relates to frequency conversion control technique field, in particular to a kind of driving based on nine phase motor power frequency shear frequencies opens
Dynamic method.
Background technique
In the prior art, power frequency operation could start after needing to wait motor totally stationary to switch to converting operation
Frequency converter, and even if there is the frequency converter of Fly a car start, also mostly three phase converter, for not allowing motor to stop
For scene, frequency converter function has limitation, and application surface shows slightly narrow.
The technical problem to be solved in the invention is:
(1) existing three phase converter can not drag the slightly narrow problem of application surface of nine phase motor operations；
(2) motor power frequency operation could start frequency conversion after needing to wait motor totally stationary to switch to converting operation
Device, waiting time are too long.
Summary of the invention
In order to solve the problems, such as described in background technique, the present invention provides a kind of driving based on nine phase motor power frequency shear frequencies
Starting method realizes nine phase motors by power frequency operation and directly cuts converting operation, and without waiting for the static process of motor.
In order to achieve the above object, the present invention is implemented with the following technical solutions:
A kind of Fly a car start method based on nine phase motor power frequency shear frequencies, includes the following steps:
Step 1: one, motor initial output after motor is switched to frequency conversion by power frequency, in frequency converter rotation given first
Voltage, while from rated frequency, gradually 0Hz is down on slope to the given frequency of frequency converter；
Step 2: nine phase currents of the motor in detection rotation, carry out the transformation of 9s → 2r coordinate vector, resolution of vectors；
Step 3: the frequency search inflection point of rotating electric machine judges；Occur when the mould for detecting nine phase current resolutions of vectors is long
After " inflection point ", then it represents that searched the speed of motor at this time；
Step 4: frequency inflection point carries out converting operation after searching frequency success, output voltage is gone back up in frequency converter V/F curve
Corresponding " full scale " voltage under this frequency, output reach the frequency conversion stable operation of motor, Fly a car start success to motor；
Step 5: frequency converter starts to operate normally.
The step one specifically: the initial output voltage is given to press " full scale " voltage, that is, voltage rating Ue
5%~20% output, adjusted in 5%~20%Ue according to the size of motor stator resistance, guarantee electric current in rated range,
Overcurrent is inhibited automatically to voltage output building negative-feedback while carrying out clipping to output electric current simultaneously.
The step two specifically: the electric current that nine phases successively differ 40 ° is decomposed into two-phase from nine phase rest frames
Rotating coordinate system realizes 9s → 2r conversion of electric current.
The step three specifically: take the long virtual value appearance " inflection point " of motor stator current-mode to be used as and search out rotor
The foundation of frequency, i.e. current effective value at the inflection point moment be minimum, before and after the moment value be increase, correspond at this time
Electric machine frequency be motor practical speed.
The step one is into step 5, when nine phase inverter devices are run, uses 9s → 2r coordinate after current of electric acquisition
Transformation is 2r → 9s inverse transformation when voltage output.
Compared with prior art, the beneficial effects of the present invention are:
1, the Fly a car start method of nine phase motor power frequency shear frequencies of the invention, it is defeated by controlling first when starting is run
The initial given voltage of 5%~20% voltage rating out, and frequency search is carried out to the motor that rotates freely, when searching
When motor speed at this time, under the premise of frequency converter normal operation, quickly promoted from lower initial voltage to motor
The corresponding VF curve voltage of actual motion frequency completes the Fly a car start of nine phase motors, stops without waiting for motor, can be direct
Into converting operation.
2, frequency converter dragging motor Fly a car start extends to nine phases by three-phase, and application field is more extensive.Motor is reduced by work
Frequency operation switches to the waiting time of converting operation.
Detailed description of the invention
Fig. 1 is the Fly a car start that nine phase inverter devices of the invention drag that nine phase motors are switched to converting operation by power frequency operation
Method flow diagram.
Specific embodiment
Specific embodiment provided by the invention is described in detail below in conjunction with attached drawing.
As shown in Figure 1, a kind of Fly a car start method based on nine phase motor power frequency shear frequencies, includes the following steps:
Step 1: one, motor initial output after motor is switched to frequency conversion by power frequency, in frequency converter rotation given first
Voltage, while from rated frequency, gradually 0Hz is down on slope to the given frequency of frequency converter；
The initial output voltage is given to be exported by " full scale " voltage, that is, voltage rating Ue 5%~20%, according to electricity
The size of machine stator resistance adjusts in 5%~20%Ue, guarantees that electric current limits in rated range, while to output electric current
Overcurrent is inhibited automatically to voltage output building negative-feedback while width.
Step 2: nine phase currents of the motor in detection rotation, carry out the transformation of 9s → 2r coordinate vector, resolution of vectors；
The electric current that nine phases successively differ 40 ° is decomposed into two-phase rotating coordinate system from nine phase rest frames, realizes electric current
9s → 2r conversion.
Above formula is 9s → 2r transformation matrix, whereinωaFor the rotation speed of dq coordinate system, θ0It is initial
Angle.Then current transformation is as follows:
T (θ) is that a pseudo- orthogonal matrix needs to use the inverse matrix of T (θ), relationship is such as when carrying out 2r → 9s transformation
Under:
Step 3: the frequency search inflection point of rotating electric machine judges；Occur when the mould for detecting nine phase current resolutions of vectors is long
After " inflection point ", then it represents that searched the speed of motor at this time；
When the long virtual value of motor stator current-mode being taken " inflection point " occur as the foundation, i.e. inflection point for searching out motor rotor frequency
Current effective value at quarter is minimum, before and after the value at moment be to increase, corresponding electric machine frequency is motor at this time
Practical speed.
Step 4: frequency inflection point carries out converting operation after searching frequency success, output voltage is gone back up in frequency converter V/F curve
Corresponding " full scale " voltage under this frequency, output reach the frequency conversion stable operation of motor, Fly a car start success to motor；
Step 5: frequency converter starts to operate normally.
The step one is into step 5, when nine phase inverter devices are run, uses 9s → 2r coordinate after current of electric acquisition
Transformation is 2r → 9s inverse transformation when voltage output.Conversion process is shown in formula (1) to formula (3).
After Fly a car start is enabled, give Rated motor voltage 5%~20% is used as initial voltage, given search rate
It then is down to 0Hz from rated frequency slope, frequency converter exports nine phase voltages and powers to nine phase motors at this time；It is same powering to motor
When, nine phase current of motor stator is acquired, nine phase rest frame electric current Ia~Ii are carried out in primary control program to two-phase rotation seat
The matrixing of mark system electric current Id, Iq, the judgement of electric machine frequency search inflection point (including first time search for it is failed after secondary search
Rope), voltage quickly gives so far corresponding VF curve voltage, system over current fault and mistake under frequency after electric machine frequency is searched for successfully
The judgement of failure, Fly a car start is pressed to complete.
Above embodiments are implemented under the premise of the technical scheme of the present invention, give detailed embodiment and tool
The operating process of body, but protection scope of the present invention is not limited to the above embodiments.Method therefor is such as without spy in above-described embodiment
Not mentionleting alone bright is conventional method.
Claims (5)
1. a kind of Fly a car start method based on nine phase motor power frequency shear frequencies, which comprises the steps of:
Step 1: frequency converter gives one initial output voltage of motor in rotation first after motor is switched to frequency conversion by power frequency,
From rated frequency, gradually 0Hz is down on slope to the given frequency of frequency converter simultaneously；
Step 2: nine phase currents of the motor in detection rotation, carry out the transformation of 9s → 2r coordinate vector, resolution of vectors；
Step 3: the frequency search inflection point of rotating electric machine judges；Occur " turning when the mould for detecting nine phase current resolutions of vectors is long
After point ", then it represents that searched the speed of motor at this time；
Step 4: frequency inflection point carries out converting operation after searching frequency success, output voltage is gone back up into this frequency in frequency converter V/F curve
" full scale " voltage corresponding under rate, output reach the frequency conversion stable operation of motor, Fly a car start success to motor；
Step 5: frequency converter starts to operate normally.
2. a kind of Fly a car start method based on nine phase motor power frequency shear frequencies according to claim 1, which is characterized in that
The step one specifically: the initial output voltage is given to press " full scale " voltage, that is, voltage rating Ue 5%~20%
Output, adjusts in 5%~20%Ue according to the size of motor stator resistance, guarantees electric current in rated range, while to defeated
Overcurrent is inhibited automatically to voltage output building negative-feedback while electric current carries out clipping out.
3. a kind of Fly a car start method based on nine phase motor power frequency shear frequencies according to claim 1, which is characterized in that
The step two specifically: the electric current that nine phases successively differ 40 ° is decomposed into two cordic phase rotators from nine phase rest frames
System realizes 9s → 2r conversion of electric current.
4. a kind of Fly a car start method based on nine phase motor power frequency shear frequencies according to claim 1, which is characterized in that
The step three specifically: take the long virtual value of motor stator current-mode occur " inflection point " as search out motor rotor frequency according to
According to, i.e., the current effective value at the inflection point moment is minimum, before and after the value at moment be to increase, corresponding motor frequency at this time
Rate is the practical speed of motor.
5. a kind of Fly a car start method based on nine phase motor power frequency shear frequencies according to claim 1, which is characterized in that
The step one is into step 5, when nine phase inverter devices are run, uses 9s → 2r coordinate transform, voltage after current of electric acquisition
It is 2r → 9s inverse transformation when output.
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| CN201810650832.6A CN109039213A (en) | 2018-06-22 | 2018-06-22 | A kind of Fly a car start method based on nine phase motor power frequency shear frequencies |
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| CN201810650832.6A CN109039213A (en) | 2018-06-22 | 2018-06-22 | A kind of Fly a car start method based on nine phase motor power frequency shear frequencies |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109660179A (en) * | 2018-12-29 | 2019-04-19 | 西安西驰电气股份有限公司 | A kind of fast starting method of frequency converter inspection |
| CN112713842A (en) * | 2020-12-19 | 2021-04-27 | 中冶南方（武汉）自动化有限公司 | Method for preventing low-frequency overcurrent in rotating speed tracking of asynchronous motor |
| CN114856985A (en) * | 2022-04-27 | 2022-08-05 | 江苏核电有限公司 | System and method for switching power frequency and frequency conversion of pump-following frequency converter |
| CN116915107A (en) * | 2023-09-11 | 2023-10-20 | 希望森兰科技股份有限公司 | Variable frequency soft start control method for vector start automatic VF switching control |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109660179A (en) * | 2018-12-29 | 2019-04-19 | 西安西驰电气股份有限公司 | A kind of fast starting method of frequency converter inspection |
| CN112713842A (en) * | 2020-12-19 | 2021-04-27 | 中冶南方（武汉）自动化有限公司 | Method for preventing low-frequency overcurrent in rotating speed tracking of asynchronous motor |
| CN114856985A (en) * | 2022-04-27 | 2022-08-05 | 江苏核电有限公司 | System and method for switching power frequency and frequency conversion of pump-following frequency converter |
| CN116915107A (en) * | 2023-09-11 | 2023-10-20 | 希望森兰科技股份有限公司 | Variable frequency soft start control method for vector start automatic VF switching control |
| CN116915107B (en) * | 2023-09-11 | 2023-11-17 | 希望森兰科技股份有限公司 | Variable frequency soft start control method for vector start automatic VF switching control |
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Effective date of registration: 20190509 Address after: No. 272 Sifangtai Road, Tiexi District, Anshan City, Liaoning Province, 114000 Applicant after: WOLONG ELECTRIC GROUP LIAONING RONGXIN ELECTRIC TRANSMISSION CO.,LTD. Applicant after: WOLONG ELECTRIC NANYANG EXPLOSION PROTECTION GROUP Co.,Ltd. Applicant after: WOLONG ELECTRIC GROUP Co.,Ltd. Address before: No. 108 Science and Technology Road, Tiedong District, Anshan City, Liaoning Province, 114000 Applicant before: LIAONING RONGXIN GAOKE ELECTRICAL CO.,LTD.OF WOLONG ELECTRIC GROUP CO.,LTD. Applicant before: WOLONG ELECTRIC NANYANG EXPLOSION PROTECTION GROUP Co.,Ltd. Applicant before: WOLONG ELECTRIC GROUP Co.,Ltd. |
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Application publication date: 20181218 |
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