CN111277190A - Method and device for identifying polarity of output current of frequency converter, controller and storage medium - Google Patents

Method and device for identifying polarity of output current of frequency converter, controller and storage medium Download PDF

Info

Publication number
CN111277190A
CN111277190A CN201911378112.XA CN201911378112A CN111277190A CN 111277190 A CN111277190 A CN 111277190A CN 201911378112 A CN201911378112 A CN 201911378112A CN 111277190 A CN111277190 A CN 111277190A
Authority
CN
China
Prior art keywords
current
polarity
phase
value
instantaneous value
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201911378112.XA
Other languages
Chinese (zh)
Other versions
CN111277190B (en
Inventor
张斌
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai Qirod Electric Science & Technology Co ltd
Original Assignee
Shanghai Qirod Electric Science & Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shanghai Qirod Electric Science & Technology Co ltd filed Critical Shanghai Qirod Electric Science & Technology Co ltd
Priority to CN201911378112.XA priority Critical patent/CN111277190B/en
Publication of CN111277190A publication Critical patent/CN111277190A/en
Application granted granted Critical
Publication of CN111277190B publication Critical patent/CN111277190B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • H02P21/14—Estimation or adaptation of machine parameters, e.g. flux, current or voltage
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/14—Indicating direction of current; Indicating polarity of voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0009—Devices or circuits for detecting current in a converter
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

The embodiment of the invention relates to the technical field of frequency conversion, and discloses a method and a device for identifying the polarity of output current of a frequency converter, a controller and a storage medium. The method comprises the following steps: sampling a three-phase current instantaneous value of a motor; calculating to obtain a current instantaneous value under a static two-phase coordinate system according to the three-phase current instantaneous value; carrying out proportional integral PI closed-loop control estimation according to the current instantaneous value under the static two-phase coordinate system to obtain the actual value of a current space vector angle; and obtaining the polarity of the three-phase current according to the actual value. According to the embodiment of the invention, the current polarity is obtained according to the current vector space angle identification, so that the accuracy of the current polarity identification can be improved, and the output voltage compensation effect of the frequency converter can be improved.

Description

Method and device for identifying polarity of output current of frequency converter, controller and storage medium
Technical Field
The invention relates to the technical field of frequency conversion, in particular to a method and a device for identifying the polarity of output current of a frequency converter, a controller and a storage medium.
Background
With the development of modern control theory and power electronic technology, the frequency conversion technology is increasingly widely applied in production and life, and the requirement on the frequency conversion technology is higher and higher. The frequency conversion technology mainly comprises a rectification part and an inversion part, wherein the rectification (generally, uncontrollable rectification) is simple, and the inversion is the main research content of the frequency conversion technology.
The inversion part is realized by a three-phase bridge circuit formed by switching devices. In the three-phase bridge type inverter circuit, because the switching devices have on-time and off-time, in order to prevent the upper and lower switching devices of the same bridge arm from being simultaneously turned on, dead time needs to be inserted at the alternate moment when the switching devices are turned on and off. In order to compensate for the influence of the dead time on the output voltage, it is necessary to perform dead time compensation on the output voltage. The determination of the current polarity is crucial in dead-zone compensation, and the wrong current polarity may exacerbate the distortion of the output voltage.
Currently, the polarity of the output current of the frequency converter is generally obtained by direct current detection plus filtering. The current polarity is judged directly by detecting the zero crossing point of the current, but the zero crossing point of the current is fuzzy due to the existence of harmonic waves, and particularly, a plurality of zero crossing points exist due to pulse width modulation noise and zero current clamping effect at low frequency, so that the accuracy of current polarity detection is difficult to ensure. For this reason, the detected current is usually subjected to a filtering process. However, the filtering may cause a delay in the phase of the current signal, so that the polarity of the current in some regions is determined incorrectly, and the influence of the dead time on the output voltage cannot be compensated correctly.
Disclosure of Invention
In view of this, an object of the embodiments of the present invention is to provide a method and an apparatus for identifying a polarity of an output current of a frequency converter, a controller, and a storage medium, wherein the polarity of the current is identified according to a current vector space angle, so that accuracy of identifying the polarity of the current can be improved, and an output voltage compensation effect of the frequency converter can be improved.
In order to solve the above technical problem, an embodiment of the present invention provides a method for identifying a polarity of an output current of a frequency converter, including:
sampling a three-phase current instantaneous value of a motor;
calculating to obtain a current instantaneous value under a static two-phase coordinate system according to the three-phase current instantaneous value;
carrying out proportional integral PI closed-loop control estimation according to the current instantaneous value under the static two-phase coordinate system to obtain an actual value of a current space vector angle;
and obtaining the polarity of the three-phase current according to the actual value.
The embodiment of the invention also provides a device for identifying the polarity of the output current of the frequency converter, which comprises:
the sampling module is used for sampling the instantaneous value of the three-phase current of the motor;
the first calculation module is used for calculating to obtain a current instantaneous value under a static two-phase coordinate system according to the three-phase current instantaneous value;
the second calculation module is used for carrying out proportional integral PI closed-loop control estimation according to the current instantaneous value under the static two-phase coordinate system to obtain an actual value of a current space vector angle;
and the polarity determining module is used for obtaining the polarity of the three-phase current according to the actual value.
An embodiment of the present invention further provides a variable frequency controller, including: the frequency converter output current polarity identification method comprises a memory and a processor, wherein the memory stores a computer program, and the processor runs the computer program to realize the frequency converter output current polarity identification method.
Embodiments of the present invention also provide a storage medium for storing a computer-readable program, where the computer-readable program is used for a computer to execute the method for identifying the polarity of the output current of the frequency converter.
Compared with the prior art, the method and the device have the advantages that the instantaneous value of the three-phase current of the motor is sampled, the instantaneous value of the current under the static two-phase coordinate system is calculated according to the instantaneous value of the three-phase current, the actual value of the current space vector angle is obtained by performing proportional integral PI closed-loop control estimation according to the instantaneous value of the current under the static two-phase coordinate system, the polarity of the three-phase current is determined according to the estimated actual value, the problem that the current polarity of certain regions is judged wrongly when the stator current is directly detected and filtered is solved, the accuracy of current polarity identification can be improved, and the output voltage compensation effect of the frequency converter can be improved.
As an embodiment, the performing proportional-integral PI closed-loop control estimation according to the current instantaneous value in the stationary two-phase coordinate system to obtain the actual value of the current space vector angle specifically includes:
calculating to obtain current synthetic space vector amplitude Iαβ；
According to the current instantaneous value under the static two-phase coordinate systemiα、iβSaid IαβAnd a reference estimate of the current space vector angle
Figure BDA0002341563870000021
Obtaining the actual value of the current space vector angle
Figure BDA0002341563870000022
And the reference estimate
Figure BDA0002341563870000023
The angle error therebetween;
if the angle error is not equal to 0, performing loop filtering on the angle error to obtain a compensation angular frequency delta omega;
relating said Δ ω to a stator angular frequency ωsAdding and integrating to obtain the reference estimation value
Figure BDA0002341563870000031
Repeating the above steps until the angle error is equal to 0, and then obtaining the corresponding reference estimation value
Figure BDA0002341563870000032
As said actual value
Figure BDA0002341563870000033
As an embodiment, the current instantaneous value i according to the stationary two-phase coordinate systemα、iβSaid IαβAnd a reference estimate of the current space vector angle
Figure BDA0002341563870000034
Obtaining the actual value of the current space vector angle
Figure BDA0002341563870000035
And the reference estimated value
Figure BDA0002341563870000036
The angle error between the two is calculated by the following formula:
Figure BDA0002341563870000037
as an example, if said
Figure RE-GDA0002479611070000038
If the angle is smaller than the preset value, the angle is adjusted
Error of the measurement
Figure RE-GDA0002479611070000039
As an embodiment, in the obtaining of the polarities of the three-phase currents according to the actual values, the three-phase current i is obtained by the following formulaa、ib、icPolarity of (c):
Figure BDA00023415638700000310
Figure BDA00023415638700000311
Figure BDA00023415638700000312
wherein K is a constant; sign (i)x) Is a function of the sign, if ixIf greater than 0, sign (i)x) Is 1, if ixLess than 0, sign (i)x) Is-1.
As one embodiment, the reference estimate is
Figure BDA00023415638700000313
Is equal to the integral of the stator angular frequency.
Drawings
Fig. 1 is a flowchart of a method for identifying polarity of output current of a frequency converter according to a first embodiment of the present invention;
fig. 2 is a schematic diagram of a current space vector angle in a method for identifying polarity of output current of a frequency converter according to a first embodiment of the present invention;
fig. 3 is a flowchart of calculating a target estimation value of a current space vector angle in a frequency converter output current polarity identification method according to a first embodiment of the present invention;
FIG. 4 is a schematic configuration diagram of an output current polarity discriminating apparatus of a frequency converter according to a second embodiment of the present invention;
fig. 5 is a schematic structural diagram of a variable frequency controller according to a third embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present invention in its various embodiments. However, the technical solution claimed in the present invention can be implemented without these technical details and various changes and modifications based on the following embodiments.
The first embodiment of the invention relates to a method for identifying the polarity of output current of a frequency converter, which is applied to a variable frequency driving device and is particularly suitable for dead zone voltage compensation. As shown in fig. 1, the method includes steps 101 to 104.
Step 101: and sampling the instantaneous value of the three-phase current of the motor.
Namely, three-phase stator current instantaneous value i is obtained by samplinga、ib、icThe three-phase stator current instantaneous value of the motor can be obtained by sampling in a manner known to those skilled in the art, and will not be described herein.
Step 102: and calculating the current instantaneous value under the static two-phase coordinate system according to the three-phase current instantaneous value.
In this case, the instantaneous value i can be converted by 3/2 as a function of the three-phase currenta、ib、icObtaining the instantaneous value i of the current under the stationary two-phase coordinate systemα、iβ。
Step 103: and performing proportional integral PI closed-loop control estimation according to the current instantaneous value under the static two-phase coordinate system to obtain the actual value of the current space vector angle.
Step 103 is equivalent to obtaining an actual value of the current space vector angle by a Phase Locked Loop (PLL) technique based on a PI (Proportional Integral) regulator
Figure BDA0002341563870000041
Specifically, step 103 may specifically include the following sub-steps:
substep 1, calculating to obtain current synthesis space vector amplitude Iαβ；
Wherein,
Figure BDA0002341563870000042
substep 2, according to the current instantaneous value i under the static two-phase coordinate systemα、iβ、IαβAnd a reference estimate of the current space vector angle
Figure BDA0002341563870000043
Obtaining the actual value of the current space vector angle
Figure BDA0002341563870000044
And a reference estimated value
Figure BDA0002341563870000045
Angle error between;
step 3, if the angle error is not equal to 0, loop filtering is carried out on the angle error to obtain a compensation angular frequency delta omega;
substep 4, relating Δ ω to stator angular frequency ωsAdding and integrating to obtain a reference estimated value
Figure BDA0002341563870000046
Substep 5 of repeating substeps 1 to 4,until the angle error is equal to 0, corresponding reference estimated value is obtained
Figure BDA0002341563870000051
As actual value
Figure BDA0002341563870000052
In other words, when the angle error is equal to 0, the reference estimation value
Figure BDA0002341563870000053
Is the estimated actual value
Figure BDA0002341563870000054
Wherein the current space vector angle
Figure BDA0002341563870000055
As shown in fig. 2. The calculation processing of substeps 2 to 5 can be referred to in fig. 3.
As shown in FIG. 3, the substep 1 is based on the instantaneous value i of the current in a stationary two-phase coordinate systemα、iβ、IαβAnd a reference estimate of the current space vector angle
Figure BDA0002341563870000056
Obtaining the actual value of the current space vector angle
Figure BDA0002341563870000057
And a reference estimated value
Figure BDA0002341563870000058
Among the angle errors, the angle error can be calculated by the following formula
Figure BDA0002341563870000059
Correlation value of (d):
Figure BDA00023415638700000510
can be obtained by the formula (one)Error in angle
Figure BDA00023415638700000511
Wherein equation (one) corresponds to a phase detector in the PLL if
Figure BDA00023415638700000512
Less than a predetermined value, i.e. when
Figure BDA00023415638700000513
If it is very small, let the angle error
Figure BDA00023415638700000514
Thus, can be directly based on
Figure BDA00023415638700000515
By approximation to obtain an angle error
Figure BDA00023415638700000516
Save the calculation amount if
Figure BDA00023415638700000517
Greater than or equal to a predetermined value, according to
Figure BDA00023415638700000518
Calculate the angle error
Figure BDA00023415638700000519
Substep 3, when
Figure BDA00023415638700000520
Time to angle error
Figure BDA00023415638700000521
And performing PI control to obtain a compensation angular frequency delta omega. Substep 3 corresponds to a "loop filter" in the phase locked loop.
Substep 4, compensating angular frequency delta omega and stator angular frequency omegasAdding and integrating to obtain a reference estimate of the current space vector angleValue of
Figure BDA00023415638700000522
Sub-step 4 corresponds to a "voltage controlled oscillator" in the phase locked loop.
In substep 3, when
Figure BDA00023415638700000523
In time, due to the action of an integral link (i.e. an I link) in the PI regulator, the compensation angular frequency delta omega keeps a certain fixed value and does not change any more, thereby ensuring that the estimated actual value and the actual current space vector angle
Figure BDA00023415638700000524
Are equal.
Step 104: and obtaining the polarity of the three-phase current according to the actual value.
Specifically, i can be determined by the following formulaa、ib、icPolarity of (c):
Figure BDA00023415638700000525
Figure BDA00023415638700000526
Figure BDA00023415638700000527
wherein K is a constant; sign (i)x) Is a function of the sign, if ixIf greater than 0, sign (i)x) Is 1, if ixLess than 0, sign (i)x) Is-1.
I.e. if ia、ib、icIs greater than 0 and less than or equal to 1, the corresponding current polarity is determined to be positive, if i isa、ib、icIs less than 0 and greater than or equal to-1, the corresponding current polarity is determined to be negative.
Compared with the prior art, the PI regulator has the advantages that the PI regulator has the functions of a digital loop filter, can filter high-frequency signals, prevent fuzzy bands of zero points from appearing, and avoid the problem of misjudgment of polarity caused by the fact that the prior art directly detects the three-phase stator current and carries out filtering processing, meanwhile, the PI closed-loop regulator has higher response speed and higher steady-state precision, so that the current space vector angle can be accurately estimated in a short time, and further the current polarity can be quickly and accurately judged.
A second embodiment of the present invention relates to an apparatus for identifying a polarity of an output current of a frequency converter, as shown in fig. 4, the apparatus 400 for identifying a polarity of an output current of a frequency converter includes:
the sampling module 401 is used for sampling the instantaneous value of the three-phase current of the motor;
the first calculation module 402 is configured to calculate a current instantaneous value in a stationary two-phase coordinate system according to the three-phase current instantaneous value;
the second calculation module 403 is configured to perform proportional integral PI closed-loop control estimation according to the current instantaneous value in the stationary two-phase coordinate system to obtain an actual value of a current space vector angle;
and a polarity determining module 404, configured to obtain the polarity of the three-phase current according to the actual value.
Optionally, the second calculation module 403 includes:
an amplitude calculation submodule for calculating to obtain current synthesis space vector amplitude Iαβ；
A phase discrimination submodule for discriminating the instantaneous current value i according to the stationary two-phase coordinate systemα、iβ、IαβAnd a reference estimate of the current spatial vector angle
Figure BDA0002341563870000061
Obtaining the actual value of the current space vector angle
Figure BDA0002341563870000062
And a reference estimated value
Figure BDA0002341563870000063
The angle error therebetween;
the filtering submodule is used for carrying out loop filtering on the angle error to obtain a compensation angular frequency delta omega if the angle error is not equal to 0;
an integration submodule for integrating Δ ω with stator angular frequency ωsAdding and integrating to obtain a reference estimated value
Figure BDA0002341563870000064
The phase detection submodule is also used for calculating the correlation value of the angle error by the following formula:
Figure BDA0002341563870000065
further, the phase detection submodule is also used for detecting if
Figure BDA0002341563870000066
If it is less than the preset value, it will order
Figure BDA0002341563870000067
The polarity determination module 404 is configured to obtain the polarities of the three-phase currents by the following equations:
Figure BDA0002341563870000068
Figure BDA0002341563870000071
Figure BDA0002341563870000072
wherein K is a constant. sign (i)x) Is a function of the sign, if ixIf greater than 0, sign (i)x) Is 1, at this time, the corresponding i is determineda、ibOr icThe current polarity of (a) is positive; if ixLess than 0, sign (i)x) Is-1, at which time, the corresponding i is determineda、ibOr icThe current polarity of (2) is negative.
Compared with the prior art, the current polarity identification device directly detects the three-phase stator current of the motor, converts the three-phase stator current into αβ current in a static two-phase coordinate system through coordinate transformation, calculates the amplitude of αβ current synthetic current vector, and estimates the actual value of a current space vector angle through αβ current and the amplitude of the synthetic current vector and by utilizing a phase-locked loop technology based on a PI regulator to judge the polarity of the three-phase stator current.
A third embodiment of the present invention relates to a variable frequency controller. As shown in fig. 5, the variable frequency controller includes: a memory 502 and a processor 501;
the memory 502 stores instructions executable by the at least one processor 501, and the instructions are executed by the at least one processor 501 to implement the method for identifying polarity of output current of a frequency converter according to the first embodiment.
The motor controller includes one or more processors 501 and a memory 502, one processor 501 being exemplified in fig. 5. The processor 501 and the memory 502 may be connected by a bus or other means, and fig. 5 illustrates the connection by the bus as an example. The memory 502, which is a non-volatile computer-readable storage medium, may be used to store non-volatile software programs, non-volatile computer-executable programs, and modules. The processor 501 executes various functional applications and data processing of the device by running nonvolatile software programs, instructions and modules stored in the memory 502, that is, the method for identifying the polarity of the output current of the frequency converter is implemented.
The memory 502 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required for at least one function, and the like. Further, the memory 502 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. One or more modules are stored in memory 502 and, when executed by the one or more processors 501, perform the method of frequency converter output current polarity identification in any of the method embodiments described above.
The above-mentioned device can execute the method provided by the embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method, and reference may be made to the method provided by the embodiment of the present invention for technical details that are not described in detail in the embodiment.
Compared with the prior art, the frequency conversion controller directly detects the three-phase stator current of the motor, converts the three-phase stator current into αβ current in a static two-phase coordinate system through coordinate transformation, calculates αβ current to synthesize the amplitude of a current vector, and estimates and obtains the actual value of a current space vector angle through αβ current and the amplitude of the synthesized current vector and by utilizing a phase-locked loop technology based on a PI regulator so as to judge the polarity of the three-phase stator current.
A fourth embodiment of the invention relates to a non-volatile storage medium for storing a computer-readable program for causing a computer to perform some or all of the above method embodiments.
That is, as those skilled in the art can understand, all or part of the steps in the method according to the above embodiments may be implemented by a program instructing related hardware, where the program is stored in a storage medium and includes several instructions to enable a device (which may be a single chip, a chip, etc.) or a processor (processor) to execute all or part of the steps in the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.

Claims (9)

1. A method for identifying the polarity of output current of a frequency converter is characterized by comprising the following steps:
sampling a three-phase current instantaneous value of a motor;
calculating to obtain a current instantaneous value under a static two-phase coordinate system according to the three-phase current instantaneous value;
carrying out proportional integral PI closed-loop control estimation according to the current instantaneous value under the static two-phase coordinate system to obtain an actual value of a current space vector angle;
and obtaining the polarity of the three-phase current according to the actual value.
2. The method for identifying polarity of output current of frequency converter according to claim 1, wherein the estimating of the actual value of the current space vector angle by the proportional-integral PI closed-loop control according to the current instantaneous value in the stationary two-phase coordinate system specifically comprises:
step 1: calculating to obtain current synthetic space vector amplitude Iαβ；
Step 2: according to the current instantaneous value i under the static two-phase coordinate systemα、iβSaid IαβAnd a reference estimate of the current space vector angle
Figure RE-FDA0002479611060000011
Obtaining the actual value of the current space vector angle
Figure RE-FDA0002479611060000012
And the reference estimate
Figure RE-FDA0002479611060000013
The angle error therebetween;
and step 3: if the angle error is not equal to 0, performing loop filtering on the angle error to obtain a compensation angular frequency delta omega;
and 4, step 4: relating said Δ ω to a stator angular frequency ωsAdding and integrating to obtain the reference estimation value
Figure RE-FDA0002479611060000014
And 5: repeating the steps 1-4 until the angle error is equal to 0, and then, correspondingly referring to the estimated value
Figure RE-FDA0002479611060000015
As the actual value
Figure RE-FDA0002479611060000016
3. The method as claimed in claim 2, wherein the current instantaneous value i is determined according to the stationary two-phase coordinate systemα、iβSaid IαβAnd a reference estimate of the current space vector angle
Figure RE-FDA0002479611060000017
Obtaining the actual value of the current space vector angle
Figure RE-FDA0002479611060000018
And the reference estimate
Figure RE-FDA0002479611060000019
The correlation value of the angle error is calculated by the following formula:
Figure RE-FDA00024796110600000110
4. the method as claimed in claim 3, wherein said step of identifying the polarity of the output current of the frequency converter is further defined as
Figure RE-FDA00024796110600000111
If the angle is less than the preset value, the angle error is made
Figure RE-FDA00024796110600000112
5. The method for identifying the polarity of the output current of the frequency converter according to claim 3, wherein the three-phase current i is obtained by the following formula in the step of obtaining the polarity of the three-phase current according to the actual valuea、ib、icPolarity of (c):
Figure RE-FDA0002479611060000021
Figure RE-FDA0002479611060000022
Figure RE-FDA0002479611060000023
wherein K is a constant; sign (i)x) Is a function of the sign, if ixIf greater than 0, sign (i)x) Is 1, if ixLess than 0, sign (i)x) Is-1.
6. The method as claimed in claim 3, wherein the reference estimation value is calculated by a method of identifying the polarity of the output current of the frequency converter
Figure RE-FDA0002479611060000024
Is equal to the integral of the stator angular frequency.
7. A converter output current polarity recognition device, characterized by includes:
the sampling module is used for sampling the instantaneous value of the three-phase current of the motor;
the first calculation module is used for calculating to obtain a current instantaneous value under a static two-phase coordinate system according to the three-phase current instantaneous value;
the second calculation module is used for carrying out proportional integral PI closed-loop control estimation according to the current instantaneous value under the static two-phase coordinate system to obtain an actual value of a current space vector angle;
and the polarity determining module is used for obtaining the polarity of the three-phase current according to the actual value.
8. A variable frequency controller, comprising: a memory storing a computer program that is executed by the processor to implement the frequency converter output current polarity identification method according to any one of claims 1 to 6, and a processor.
9. A storage medium storing a computer-readable program for causing a computer to execute the frequency converter output current polarity identification method according to any one of claims 1 to 6.
CN201911378112.XA 2019-12-27 2019-12-27 Method and device for identifying polarity of output current of frequency converter, controller and storage medium Active CN111277190B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911378112.XA CN111277190B (en) 2019-12-27 2019-12-27 Method and device for identifying polarity of output current of frequency converter, controller and storage medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911378112.XA CN111277190B (en) 2019-12-27 2019-12-27 Method and device for identifying polarity of output current of frequency converter, controller and storage medium

Publications (2)

Publication Number Publication Date
CN111277190A true CN111277190A (en) 2020-06-12
CN111277190B CN111277190B (en) 2022-05-31

Family

ID=71000143

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911378112.XA Active CN111277190B (en) 2019-12-27 2019-12-27 Method and device for identifying polarity of output current of frequency converter, controller and storage medium

Country Status (1)

Country Link
CN (1) CN111277190B (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4788493A (en) * 1984-12-04 1988-11-29 Square D Company Apparatus for detecting direction of electric power flow
CN101295955A (en) * 2007-04-26 2008-10-29 三洋电机株式会社 Motor control device
CN105356765A (en) * 2015-12-09 2016-02-24 哈尔滨理工大学 Control system and control method of indirect space vector matrix converter based on 60-degree coordinate system
CN107994824A (en) * 2017-12-15 2018-05-04 华南理工大学 A kind of asynchronous machine low-frequency oscillation suppression method based on current closed-loop and compensation

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4788493A (en) * 1984-12-04 1988-11-29 Square D Company Apparatus for detecting direction of electric power flow
CN101295955A (en) * 2007-04-26 2008-10-29 三洋电机株式会社 Motor control device
CN105356765A (en) * 2015-12-09 2016-02-24 哈尔滨理工大学 Control system and control method of indirect space vector matrix converter based on 60-degree coordinate system
CN107994824A (en) * 2017-12-15 2018-05-04 华南理工大学 A kind of asynchronous machine low-frequency oscillation suppression method based on current closed-loop and compensation

Also Published As

Publication number Publication date
CN111277190B (en) 2022-05-31

Similar Documents

Publication Publication Date Title
CN113866480B (en) Detection of offset errors in phase current measurements for motor control systems
US7859215B2 (en) Motor controller, control system, and control method
US20070241720A1 (en) Inverter system
JP5664080B2 (en) Motor control device and motor control method
US10516330B2 (en) Power converting device for controlling current based on oscillation component of voltage amplitude, and current control method based on oscillation component of voltage amplitude
CN107085193B (en) Detection of offset errors in phase current measurements for motor control systems
US9397602B2 (en) Rotary electric machine control apparatus and control method for rotary electric machine
US9802642B2 (en) Phase current measurement diagnostic
JP6726390B2 (en) Controller for permanent magnet type synchronous motor
JP5709932B2 (en) Synchronous machine controller
CN113241986B (en) Motor control method, control system and storage medium
CN114598206B (en) Design method of permanent magnet synchronous motor wide-speed-domain rotor position observer
US10199972B2 (en) Control device for an electric motor
CN106059424A (en) Improved Kalman observer based control method free of speed sensor
JP6304180B2 (en) Power conversion device, power generation system, control device, and control method
US10693398B2 (en) Method for adjusting an amplitude of a voltage injection of a rotating, multi-phase electric machine, which electric machine is fed by means of a PWM-controlled inverter
CN111277190B (en) Method and device for identifying polarity of output current of frequency converter, controller and storage medium
CN114826064A (en) Method for detecting position and speed of permanent magnet synchronous motor rotor based on orthogonal phase-locked loop
CN112640291B (en) Motor control device
CN117849688A (en) Method for detecting abnormality of current sensor of active filter and active filter
JPH095376A (en) Abnormal phase rotation detector
CN113078854A (en) Motor control method and device and motor
CN104811079B (en) The dead-zone compensation method and system of open-loop driver
CN110957953B (en) Control device and control method for alternating current motor
EP3331155A1 (en) Motor control device, motor control method, program, and phase adjustment method

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
CB02 Change of applicant information
CB02 Change of applicant information

Address after: 201703 workshop, 2nd floor, building 8, No. 339, Songchun Road, Qingpu District, Shanghai

Applicant after: SHANGHAI QIROD ELECTRIC SCIENCE & TECHNOLOGY CO.,LTD.

Address before: 201703 workshop, 2nd floor, building 8, No. 339, Songchun Road, Qingpu District, Shanghai

Applicant before: SHANGHAI QIROD ELECTRIC SCIENCE & TECHNOLOGY CO.,LTD.

GR01 Patent grant
GR01 Patent grant