CN107733308A - A kind of asynchronous machine method and a device for controlling weak magnetism - Google Patents
A kind of asynchronous machine method and a device for controlling weak magnetism Download PDFInfo
- Publication number
- CN107733308A CN107733308A CN201711048066.8A CN201711048066A CN107733308A CN 107733308 A CN107733308 A CN 107733308A CN 201711048066 A CN201711048066 A CN 201711048066A CN 107733308 A CN107733308 A CN 107733308A
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- asynchronous machine
- regulation
- vector
- current
- induction motors
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Classifications
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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
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/0085—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation specially adapted for high speeds, e.g. above nominal speed
- H02P21/0089—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation specially adapted for high speeds, e.g. above nominal speed using field weakening
-
- 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
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/24—Vector control not involving the use of rotor position or rotor speed sensors
- H02P21/28—Stator flux based control
-
- 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
- H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
Abstract
This application discloses a kind of asynchronous machine method and a device for controlling weak magnetism, this method includes：Asynchronous machine stator voltage vector amplitude Us is obtained in real time；Judge whether Us exceeds setting value Us_set；When judging that obtaining Us exceeds Us_set, under d q coordinate systems, the regulation track of Regulation for Stator Current of Induction Motors vector is determined；Wherein, the starting point of the regulation track is the changing coordinates of Regulation for Stator Current of Induction Motors vector, and terminal is coordinate (a, 0), 0≤a≤id_min, id_min are that asynchronous machine reaches maximum speed, asynchronous motor torque electric current is zero and Us reaches exciting current corresponding during Us_set；According to the change of extent of deviation between Us_set and Us, Regulation for Stator Current of Induction Motors vector is adjusted so that Regulation for Stator Current of Induction Motors vector moves along the regulation track, until Us is reduced to below Us_set, is required so as to meet the control of the weak magnetic of asynchronous machine.
Description
Technical field
The present invention relates to weak magnetic control technology field, more specifically to a kind of asynchronous machine field weakening control method and
Device.
Background technology
In Vector Control System of Induction Motor, because DC side voltage of converter is limited, so when Rotational Speed of Asynchronous Motor raises
When to a certain extent, asynchronous machine stator voltage vector amplitude is up to limiting value (i.e. the exportable maximum voltage of inverter),
Cause current regulator saturation, now inverter will lose regulating power to Regulation for Stator Current of Induction Motors vector.In order to obtain
Wide speed regulating range reduces exciting current, it is necessary to asynchronous machine progress weak magnetic control, to weaken asynchronous machine magnetic field, so as to
By asynchronous machine stator voltage vector amplitude stability in the range of less than limiting value.
The content of the invention
In view of this, the present invention provides a kind of asynchronous machine method and a device for controlling weak magnetism, to meet the weak of asynchronous machine
Magnetic control requirement.
A kind of asynchronous machine field weakening control method, including：
Asynchronous machine stator voltage vector amplitude is obtained in real time；
Judge whether asynchronous machine stator voltage vector amplitude exceeds setting value；
When judging that obtaining asynchronous machine stator voltage vector amplitude exceeds the setting value, under d-q coordinate systems, it is determined that
The regulation track of Regulation for Stator Current of Induction Motors vector；Wherein, the starting point of the regulation track is Regulation for Stator Current of Induction Motors vector
Changing coordinates, terminal is coordinate (a, 0), and 0≤a≤id_min, id_min are that asynchronous machine reaches maximum speed, asynchronous machine
Torque current is zero and asynchronous machine stator voltage vector amplitude reaches exciting current corresponding during the setting value；
According to the change of extent of deviation between the setting value and asynchronous machine stator voltage vector amplitude, asynchronous electricity is adjusted
Machine stator current phasor so that Regulation for Stator Current of Induction Motors vector moves along the regulation track, until asynchronous machine stator
Voltage vector magnitude is reduced to below the setting value.
Optionally, the regulation track is a line segment that the terminal is pointed to by the starting point.
Optionally, the regulation track is a curve that the terminal is pointed to by the starting point.
Optionally, the curve is sinusoidal or cosine curve.
Optionally, the terminal point coordinate is (id_min, 0).
A kind of asynchronous machine weak magnetic control device, including：
Acquiring unit, for obtaining asynchronous machine stator voltage vector amplitude in real time；
Judging unit, for judging whether asynchronous machine stator voltage vector amplitude exceeds setting value；
Determining unit, for judging to obtain asynchronous machine stator voltage vector amplitude in the judging unit to set described in
During definite value, under d-q coordinate systems, the regulation track of Regulation for Stator Current of Induction Motors vector is determined；Wherein, of the regulation track
Point is the changing coordinates of Regulation for Stator Current of Induction Motors vector, and terminal is coordinate (a, 0), 0≤a≤id_min, and id_min is asynchronous
Motor reaches maximum speed, asynchronous motor torque electric current is zero and asynchronous machine stator voltage vector amplitude reaches the setting
Corresponding exciting current during value；
Adjustment unit, for the change according to extent of deviation between the setting value and asynchronous machine stator voltage vector amplitude
To change, adjust Regulation for Stator Current of Induction Motors vector so that Regulation for Stator Current of Induction Motors vector moves along the regulation track, until
Asynchronous machine stator voltage vector amplitude is reduced to below the setting value.
Optionally, the regulation track is a line segment that the terminal is pointed to by the starting point.
Optionally, the regulation track is a curve that the terminal is pointed to by the starting point.
Optionally, the curve is sinusoidal or cosine curve.
Optionally, the terminal point coordinate is (id_min, 0).
It can be seen from the above technical scheme that the present invention exceeds setting value in asynchronous machine stator voltage vector amplitude Us
During Us_set, the regulation track of Regulation for Stator Current of Induction Motors vector is cooked up, is then adjusted according to Us_set and Us difference different
Walk motor stator current phasor so that Regulation for Stator Current of Induction Motors vector gradually moves along the regulation track to terminal direction
Dynamic, exciting current and torque current are gradually reduced in moving process, and Us reduces therewith, until when Us is reduced to below Us_set
Stop regulation, the weak magnetic control for meeting asynchronous machine requires.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is a kind of asynchronous machine field weakening control method flow chart disclosed in the embodiment of the present invention；
Fig. 2 be asynchronous machine motoring condition under, Regulation for Stator Current of Induction Motors vector regulation track terminal point coordinate for (0,
0) regulation track schematic diagram when；
Fig. 3 be Induction Motor at Generation state under, Regulation for Stator Current of Induction Motors vector regulation track terminal point coordinate for (0,
0) regulation track schematic diagram when；
Fig. 4 is a kind of asynchronous machine weak magnetic controling device structure diagram disclosed in the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
Referring to Fig. 1, the embodiment of the invention discloses a kind of asynchronous machine field weakening control method, including：
Step S01：Asynchronous machine stator voltage vector amplitude Us is obtained in real time.
Step S02：Judge whether asynchronous machine stator voltage vector amplitude Us exceeds setting value Us_set, judging to obtain
During Us ＞ Us_set, into step S03.
Specifically, in Vector Control System of Induction Motor, because DC side voltage of converter is limited, so when asynchronous machine turns
When speed is raised to a certain extent, asynchronous machine stator voltage vector amplitude Us is up to limiting value, causes current regulator saturation,
In order to obtain wide speed regulating range, the embodiment of the present invention is by asynchronous machine stator voltage vector amplitude Us ＞ setting value Us_set (Us_
Set is usually arranged as a certain value of slightly below described limiting value), it is considered as the hidden danger that current regulator saturation be present, starts to different
Walk motor and carry out weak magnetic control.
Step S03：Under d-q coordinate systems, the regulation track of Regulation for Stator Current of Induction Motors vector is determined.Wherein, the tune
The starting point for saving track is the changing coordinates of Regulation for Stator Current of Induction Motors vector, and terminal is coordinate (a, 0), 0≤a≤id_min, id_
Min is that asynchronous machine reaches maximum speed, asynchronous motor torque electric current is zero and corresponding excitation electricity during Us=Us_set
Stream.
Specifically, exciting current is the d axis components of Regulation for Stator Current of Induction Motors vector.Reach stable state in asynchronous machine and neglect
Slightly in the case of the influence of Resistance versus voltage, from asynchronous machine stator voltage equation,ωe_maxFor
Synchronous electric angle frequency, L corresponding to asynchronous machine maximum speedsFor stator inductance.
In the case of known to asynchronous machine maximum speed, due to now id_min can be calculated according to above-mentioned formula,
So the terminal of the regulation track of Regulation for Stator Current of Induction Motors vector could be arranged to coordinate (a, 0), 0≤a≤id_min.And
In the case that asynchronous machine maximum speed is unknown, due to id_min can not be calculated according to above-mentioned formula, so asynchronous machine is determined
The terminal of the regulation track of electron current vector may be only configured to coordinate (0,0).
Certainly, in the case of known to asynchronous machine maximum speed, the regulation track of Regulation for Stator Current of Induction Motors vector
Terminal is preferably coordinate (id_min, 0), and now asynchronous motor torque response speed is faster.
Step S04：According to the change of extent of deviation between Us_set and Us, Regulation for Stator Current of Induction Motors vector is adjusted, is made
Obtain Regulation for Stator Current of Induction Motors vector to move along the regulation track, until Us is reduced to below Us_set.
Specifically, in the case where Rotational Speed of Asynchronous Motor is certain, from asynchronous machine stator voltage equation, asynchronous machine
The stator voltage limit is an ellipse centered on origin under d-q coordinate systems, and referred to as voltage limit is oval；With asynchronous machine
The rise of rotating speed, voltage limit ellipse can be gradually reduced.
Regulation for Stator Current of Induction Motors vector locus is a circle using origin as the center of circle under d-q coordinate systems, and its radius is different
Walk motor stator current phasor amplitude.Only Regulation for Stator Current of Induction Motors vector be located at voltage limit it is oval internal when, electric current is adjusted
Saving device just will not saturation.
Based on this, the embodiment of the present invention is cooked up at Us ＞ Us_set (hidden danger that current regulator saturation be present)
The regulation track of Regulation for Stator Current of Induction Motors vector, that is, the motion track on the summit of Regulation for Stator Current of Induction Motors vector, so
Afterwards by Us_set and Us difference input voltage regulation device, the output of the voltage regulator is for current asynchronous motor stator
What the regulated quantity or adjustment factor of current phasor, the regulated quantity or adjustment factor characterized is to Regulation for Stator Current of Induction Motors vector
Regulating degree.Next, the regulated quantity or adjustment factor that are exported according to the voltage regulator adjust asynchronous machine stator electricity
Flow vector so that Regulation for Stator Current of Induction Motors vector gradually moves along the regulation track to terminal, Us_set and Us difference
Value is bigger, and bigger to the regulating degree of Regulation for Stator Current of Induction Motors vector, Regulation for Stator Current of Induction Motors vector distance terminal is got over
Closely, corresponding, (i.e. asynchronous machine gives for exciting current (i.e. the d axis components of the given current phasor of asynchronous machine) and torque current
The q axis components of current phasor) it is just smaller.From asynchronous machine stator voltage equation, the reduction of exciting current and torque current
Us can be reduced, therefore the embodiment of the present invention can make Us be quickly reduced to below Us_set, now asynchronous machine stator is electric
The voltage limit that flow vector is located under current rotating speed is oval internal, avoids current regulator saturation, meets asynchronous machine
Weak magnetic control requires.
Wherein, the regulation track of Regulation for Stator Current of Induction Motors vector can be a line segment that terminal is pointed to by starting point,
Can be a curve that terminal is pointed to by starting point, such as just/cosine curve etc. does not limit to.
For example, terminal (0,0) is pointed to by starting point when the regulation track of Regulation for Stator Current of Induction Motors vector is one
During line segment, I is usedsThe Regulation for Stator Current of Induction Motors vector before regulation is represented, uses Is' represent the Regulation for Stator Current of Induction Motors after regulation
Vector, then Is'=Is(1+k), the regulated quantity of Regulation for Stator Current of Induction Motors vector is kIs', k is adjustment factor, -1≤k ＜ 0,
K reduces, the I when k is reduced to -1 with the increase of extent of deviation between Us_set and Uss' the terminal (0,0) is moved to, such as
Shown in Fig. 2~Fig. 3.
Fig. 2 is the regulation track schematic diagram of Regulation for Stator Current of Induction Motors vector under asynchronous machine motoring condition, and Fig. 3 is different
Walk under electric power generation state, the regulation track schematic diagram of Regulation for Stator Current of Induction Motors vector, two in Fig. 2, Fig. 3 are oval to be represented
Voltage limit under different rotating speeds is oval, by IsSummit point to (0,0) line segment be the regulation track l.
In addition, the embodiment of the invention also discloses a kind of asynchronous machine weak magnetic control device, including：
Acquiring unit 100, for obtaining asynchronous machine stator voltage vector amplitude in real time；
Judging unit 200, for judging whether asynchronous machine stator voltage vector amplitude exceeds setting value；
Determining unit 300, for judging to obtain asynchronous machine stator voltage vector amplitude beyond described in judging unit 200
During setting value, under d-q coordinate systems, the regulation track of Regulation for Stator Current of Induction Motors vector is determined；Wherein, the regulation track
Starting point is the changing coordinates of Regulation for Stator Current of Induction Motors vector, and terminal is coordinate (a, 0), and 0≤a≤id_min, id_min are different
Motor reaches maximum speed to step, asynchronous motor torque electric current is zero and asynchronous machine stator voltage vector amplitude reaches described and set
Corresponding exciting current during definite value；
Adjustment unit 400, for according to extent of deviation between the setting value and asynchronous machine stator voltage vector amplitude
Change, adjust Regulation for Stator Current of Induction Motors vector so that Regulation for Stator Current of Induction Motors vector along it is described regulation track move,
Until asynchronous machine stator voltage vector amplitude is reduced to below the setting value.
Optionally, the regulation track that determining unit 300 determines is a line that the terminal is pointed to by the starting point
Section.
Optionally, the regulation track that determining unit 300 determines is a song that the terminal is pointed to by the starting point
Line, such as just/cosine curve.
Optionally, the terminal point coordinate is (id_min, 0).
Each embodiment is described by the way of progressive in this specification, what each embodiment stressed be and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.For device disclosed in embodiment
For, because it is corresponded to the method disclosed in Example, so description is fairly simple, related part is said referring to method part
It is bright.
The foregoing description of the disclosed embodiments, professional and technical personnel in the field are enable to realize or using the present invention.
A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments in the case where not departing from the spirit or scope of the embodiment of the present invention.Therefore,
The embodiment of the present invention is not intended to be limited to the embodiments shown herein, and be to fit to principles disclosed herein and
The consistent most wide scope of features of novelty.
Claims (10)
- A kind of 1. asynchronous machine field weakening control method, it is characterised in that including：Asynchronous machine stator voltage vector amplitude is obtained in real time；Judge whether asynchronous machine stator voltage vector amplitude exceeds setting value；When judging that obtaining asynchronous machine stator voltage vector amplitude exceeds the setting value, under d-q coordinate systems, determine asynchronous The regulation track of motor stator current phasor；Wherein, starting point the working as Regulation for Stator Current of Induction Motors vector of the regulation track Preceding coordinate, terminal are coordinate (a, 0), and 0≤a≤id_min, id_min are that asynchronous machine reaches maximum speed, asynchronous motor torque Electric current is zero and asynchronous machine stator voltage vector amplitude reaches exciting current corresponding during the setting value；According to the change of extent of deviation between the setting value and asynchronous machine stator voltage vector amplitude, regulation asynchronous machine is determined Electron current vector so that Regulation for Stator Current of Induction Motors vector moves along the regulation track, until asynchronous machine stator voltage Vector magnitude is reduced to below the setting value.
- 2. asynchronous machine field weakening control method according to claim 1, it is characterised in that it is described regulation track be one by The starting point points to the line segment of the terminal.
- 3. asynchronous machine field weakening control method according to claim 1, it is characterised in that it is described regulation track be one by The starting point points to the curve of the terminal.
- 4. asynchronous machine field weakening control method according to claim 3, it is characterised in that the curve is sinusoidal or cosine Curve.
- 5. asynchronous machine field weakening control method according to claim 1, it is characterised in that the terminal point coordinate is (id_ min,0)。
- A kind of 6. asynchronous machine weak magnetic control device, it is characterised in that including：Acquiring unit, for obtaining asynchronous machine stator voltage vector amplitude in real time；Judging unit, for judging whether asynchronous machine stator voltage vector amplitude exceeds setting value；Determining unit, exceed the setting value for judging to obtain asynchronous machine stator voltage vector amplitude in the judging unit When, under d-q coordinate systems, determine the regulation track of Regulation for Stator Current of Induction Motors vector；Wherein, the starting point of the regulation track is The changing coordinates of Regulation for Stator Current of Induction Motors vector, terminal are coordinate (a, 0), and 0≤a≤id_min, id_min are asynchronous machine Reach maximum speed, when asynchronous motor torque electric current is zero and asynchronous machine stator voltage vector amplitude reaches the setting value Corresponding exciting current；Adjustment unit, for the change according to extent of deviation between the setting value and asynchronous machine stator voltage vector amplitude, Adjust Regulation for Stator Current of Induction Motors vector so that Regulation for Stator Current of Induction Motors vector moves along the regulation track, until different Step motor stator voltage vector magnitude is reduced to below the setting value.
- 7. asynchronous machine weak magnetic control device according to claim 6, it is characterised in that it is described regulation track be one by The starting point points to the line segment of the terminal.
- 8. asynchronous machine weak magnetic control device according to claim 6, it is characterised in that it is described regulation track be one by The starting point points to the curve of the terminal.
- 9. asynchronous machine weak magnetic control device according to claim 8, it is characterised in that the curve is sinusoidal or cosine Curve.
- 10. asynchronous machine weak magnetic control device according to claim 6, it is characterised in that the terminal point coordinate is (id_ min,0)。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711048066.8A CN107733308B (en) | 2017-10-31 | 2017-10-31 | Weak magnetic control method and device for asynchronous motor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711048066.8A CN107733308B (en) | 2017-10-31 | 2017-10-31 | Weak magnetic control method and device for asynchronous motor |
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| Publication Number | Publication Date |
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| CN107733308A true CN107733308A (en) | 2018-02-23 |
| CN107733308B CN107733308B (en) | 2020-03-24 |
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| CN109474220A (en) * | 2018-12-19 | 2019-03-15 | 四川虹美智能科技有限公司 | A kind of motor control method and MCU |
| CN112636656A (en) * | 2019-10-08 | 2021-04-09 | 中车时代电动汽车股份有限公司 | Method and device for adjusting current amplitude of motor stator |
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| CN107733308B (en) | 2020-03-24 |
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