CN102857169A - Control method to dual induction motor on the basis of single inverter with non-velocity sensor - Google Patents

Control method to dual induction motor on the basis of single inverter with non-velocity sensor Download PDF

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Publication number
CN102857169A
CN102857169A CN2012103158592A CN201210315859A CN102857169A CN 102857169 A CN102857169 A CN 102857169A CN 2012103158592 A CN2012103158592 A CN 2012103158592A CN 201210315859 A CN201210315859 A CN 201210315859A CN 102857169 A CN102857169 A CN 102857169A
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motor
current
equation
rotor
torque
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刘栋良
崔言飞
陈镁斌
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Hangzhou Dianzi University
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Hangzhou Dianzi University
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Abstract

The invention discloses a kind of based on the single inverter of Speedless sensor to the control method of double-induction motivation. In the prior art, when double motor parameter in system or different load, system just will appear unstable. The present invention proposes the method for using double motor mean parameter and difference, construct new stator current model, use new control electric current object, and selecting rotor speed and the rotor flux of double motor is feedback parameter, is obtained as input with reference to exciting current by rotor speed error and rotor flux
Figure 2012103158592100004DEST_PATH_IMAGE001
With torque reference electric current
Figure 405078DEST_PATH_IMAGE002
, by respectively with actual current ,
Figure 315265DEST_PATH_IMAGE004
Comparison obtains deviation, and the control run to double motor is realized in the input that two current deviation values are adjusted as inverter switching states. The present invention overcomes effective controls that stable operation of the single inverter to double motor the drawbacks of system fluctuation of service, is realized in traditional control method.

Description

Based on the single inverter of the Speedless sensor control method to the double-induction motivation
Technical field
The invention belongs to the control method technical field of AC servo, be specifically related to a kind of single inverter based on Speedless sensor to the control method of double-induction motivation.
Background technology
Vector control is control mode commonly used in the induction motor control system.In the motor vector control system, the operation of a motor of next inverter control of ordinary circumstance, but in commercial Application, for example in railway power traction and the iron and steel processing dynamics drive system, for the consideration succinct to economy, harmony and system, often need a plurality of motor of inverter control to cooperate operation.Traditional single inverter has two kinds to multimotor control method, and a kind of is that a plurality of motor of parallel running are processed as a large motor, and another kind of control mode is only to select one of them motor as object of observation in the multiple-motor system.Use traditional control mode, can't comprehensively feed back to control system to each motoring, when each motor parameter or operating load not simultaneously, dynamical system will occur unstable in running.Therefore, a kind of new single inverter is controlled the proposition of multiple-motor stable operation method, is very necessary in actual applications.
Summary of the invention
The objective of the invention is for the deficiencies in the prior art, propose a kind of single inverter based on Speedless sensor to the control method of double-induction motivation.
What the present invention proposed may further comprise the steps based on the single inverter of the Speedless sensor control method to the double-induction motivation:
Step 1, the stator current model that structure is new are selected control electric current object
Flowing to the motor total current by inverter is
Figure 2012103158592100002DEST_PATH_IMAGE002
, wherein, what flow to the first motor is
Figure 2012103158592100002DEST_PATH_IMAGE004
, what flow to the second motor is
Figure 2012103158592100002DEST_PATH_IMAGE006
, now construct the motor average current
Figure 2012103158592100002DEST_PATH_IMAGE008
And difference between current
Figure 2012103158592100002DEST_PATH_IMAGE010
:
（1）
Figure 2012103158592100002DEST_PATH_IMAGE014
（2）
Select average current As control electric current object, motor speed and electromagnetic torque are regulated.In the present invention, symbol "-" expression mean value, " △ " represents difference, and subscript 1 refers to the first motor, and subscript 2 refers to the second motor.
Step 2, selection motor feedback parameter
The control of employing Speedless sensor, selecting rotor speed and the rotor flux of double motor is feedback parameter.Adopt two adaptive rotor flux observers, measure in real time respectively stator current and the voltage of two parallel running motor, be transformed under the two-phase static coordinate, and calculate respectively actual speed and the rotor flux of two motor, as the motor feedback parameter.
Step 3, set up new space vector coordinate system
Select the d direction of principal axis, set up the d-q rotating coordinate system, the rotor flux of two motor is expressed in rotating coordinate system, and synthetic to mean value and the difference vector of two motor rotor magnetic fluxs.
Step 4, definite with reference to the exciting current function
According to the field orientation principle, in vector control, respectively to the induction motor exciting current And torque current
Figure 2012103158592100002DEST_PATH_IMAGE018
Regulate.Direct-axis current wherein The same direction of the magnetic potential that produces and rotor magnetic potential can be by the control exciting current
Figure 904104DEST_PATH_IMAGE016
Regulate rotor flux.
Under rotating coordinate system, the state vector equation of induction motor is:
Figure 2012103158592100002DEST_PATH_IMAGE020
（3）
In the formula
Figure 2012103158592100002DEST_PATH_IMAGE022
,
Figure 2012103158592100002DEST_PATH_IMAGE024
,
Figure 2012103158592100002DEST_PATH_IMAGE026
, ,
Figure 2012103158592100002DEST_PATH_IMAGE030
Be stator current, Be rotor flux, Be the inverter angular frequency,
Figure 2012103158592100002DEST_PATH_IMAGE036
Be motor angle speed,
Figure 2012103158592100002DEST_PATH_IMAGE038
Be the motor mutual inductance,
Figure 2012103158592100002DEST_PATH_IMAGE040
Be the stator self-induction,
Figure 2012103158592100002DEST_PATH_IMAGE042
Be the rotor self-induction,
Figure 2012103158592100002DEST_PATH_IMAGE044
Be rotor resistance.
To the state equation of the first motor, the second motor, merge:
Figure 2012103158592100002DEST_PATH_IMAGE046
（4）
Equation (4) can be converted into following formula:
Figure 2012103158592100002DEST_PATH_IMAGE048
（5）
In the equation
Figure 2012103158592100002DEST_PATH_IMAGE050
,
Figure 2012103158592100002DEST_PATH_IMAGE052
, , ,
Figure 2012103158592100002DEST_PATH_IMAGE058
, ,
Figure 2012103158592100002DEST_PATH_IMAGE062
, ,
Figure 2012103158592100002DEST_PATH_IMAGE066
,
Figure 2012103158592100002DEST_PATH_IMAGE068
Under motor self parameter and rotating speed same case of two parallel joins, equation (5) is identical with equation (3).
In state equation (5), the equation on the d axle is:
Figure 2012103158592100002DEST_PATH_IMAGE070
（6）
Because average rotor flux is definite value, so Be 0, by
Figure 2012103158592100002DEST_PATH_IMAGE074
Direction is the d direction of principal axis, knows
Figure 2012103158592100002DEST_PATH_IMAGE076
,
Figure 2012103158592100002DEST_PATH_IMAGE078
, so equation (6) can be expressed as:
（7）
From equation (7), can obtain with reference to the exciting current function:
（8）
According to formula (8), by the angular speed error
Figure 2012103158592100002DEST_PATH_IMAGE084
With the actual rotor magnetic flux
Figure 2012103158592100002DEST_PATH_IMAGE086
With
Figure 2012103158592100002DEST_PATH_IMAGE088
As the reference exciting current that obtains with reference to input, with the exciting current size contrast that actual measurement obtains, the exciting current error that obtains is regulated the on off state of inverter as the reference input of the adjusting inverter of system.
Step 5, determine the torque reference current function
By regulating torque current in the vector control
Figure 61764DEST_PATH_IMAGE018
Control the electromagnetic torque of motor, in the d-q coordinate system, the electromagnetic torque equation is:
Figure 2012103158592100002DEST_PATH_IMAGE090
（9）
Wherein
Figure 2012103158592100002DEST_PATH_IMAGE092
Be the number of pole-pairs of motor, the electromagnetic torque equation that merges the first motor, the second motor gets:
Figure 2012103158592100002DEST_PATH_IMAGE094
（10）
That is:
Figure 2012103158592100002DEST_PATH_IMAGE096
(11)
In the formula
Figure 2012103158592100002DEST_PATH_IMAGE098
,
Figure 2012103158592100002DEST_PATH_IMAGE100
,
Figure 2012103158592100002DEST_PATH_IMAGE102
,
Figure 2012103158592100002DEST_PATH_IMAGE104
,
Figure 2012103158592100002DEST_PATH_IMAGE106
If two motor self parameter is identical, so
Figure 2012103158592100002DEST_PATH_IMAGE108
, then equation (11) is
Equation in the equation (10) in the d-q coordinate system is:
Figure 2012103158592100002DEST_PATH_IMAGE112
（12）
By
Figure 318214DEST_PATH_IMAGE074
Direction is the d direction of principal axis, knows
Figure 140676DEST_PATH_IMAGE076
,
Figure 470027DEST_PATH_IMAGE078
, so equation (12) can be expressed as:
Figure 668927DEST_PATH_IMAGE112
（13）
Can obtain the torque reference current function by equation (13):
（14）
“ ﹡ Zhong above equation " the expression reference quantity, " ∧ " represents estimated value.
According to the torque current reference value that formula (14) obtains, with the torque current size contrast of actual measurement, the torque current error that obtains is as the reference input of the adjusting inverter of system.
Step 6, realization vector control
Reference current
Figure 2012103158592100002DEST_PATH_IMAGE116
, With the actual current that obtains through measurement and coordinate transform ,
Figure 2012103158592100002DEST_PATH_IMAGE122
The current deviation value that contrast obtains is input in the PI controller, obtains reference voltage
Figure 2012103158592100002DEST_PATH_IMAGE124
,
Figure 2012103158592100002DEST_PATH_IMAGE126
, after coordinate transform, the PWM inverter is controlled, regulate the stable operation of double motor.
Beneficial effect of the present invention: by control mode of the present invention, double motor can be made in the situation that the different stable operation of motor parameter difference or load, and quick and stable reaches stable state in the situation that the motor given speed changes or load changes.
Description of drawings
Fig. 1 is parallel join double motor current model figure;
Fig. 2 is parallel join double motor vectogram;
Fig. 3 system construction drawing.
Embodiment:
Step 1, the stator current model that structure is new are selected control electric current object
As shown in Figure 1, flowing to the motor total current by inverter is
Figure 898658DEST_PATH_IMAGE002
, wherein, what flow to the first motor is
Figure 892021DEST_PATH_IMAGE004
, what flow to the second motor is
Figure 708668DEST_PATH_IMAGE006
, now construct the motor average current
Figure 445679DEST_PATH_IMAGE008
And difference between current
Figure 782114DEST_PATH_IMAGE010
:
Figure 211958DEST_PATH_IMAGE012
（1）
（2）
Select average current
Figure 791024DEST_PATH_IMAGE008
As control electric current object, motor speed and electromagnetic torque are regulated.In the present invention, symbol "-" expression mean value, " △ " represents difference.
Step 2, selection motor feedback parameter
The present invention adopts Speedless sensor control, and selecting rotor speed and the rotor flux of double motor is feedback parameter.By two adaptive rotor flux observers, measure in real time respectively stator current and the voltage of two parallel running motor, be transformed under the two-phase static coordinate, and calculate respectively actual speed and the rotor flux of two motor, as the motor feedback parameter.
Step 3, set up new space vector coordinate system
In order to realize the control system vector control, need to set up the vector model of new double motor.Select the d direction of principal axis, set up the d-q rotating coordinate system, the rotor flux of two motor is expressed in rotating coordinate system, and synthetic to mean value and the difference vector of two motor rotor magnetic fluxs.
As shown in Figure 2, among the figure
Figure 2012103158592100002DEST_PATH_IMAGE128
With Respectively two motor rotor magnetic fluxs,
Figure 309861DEST_PATH_IMAGE074
,
Figure DEST_PATH_IMAGE132
Be respectively
Figure 458077DEST_PATH_IMAGE128
With
Figure 249316DEST_PATH_IMAGE130
Mean value and difference.Wherein, select
Figure 328130DEST_PATH_IMAGE074
Direction be the d direction of principal axis, set up the d-q rotating coordinate system, the relation of parameters vector as shown in FIG..
Step 4, definite with reference to the exciting current function
According to the field orientation principle, in vector control, respectively to the induction motor exciting current
Figure 630368DEST_PATH_IMAGE016
And torque current
Figure 402015DEST_PATH_IMAGE018
Regulate.Direct-axis current wherein
Figure 414970DEST_PATH_IMAGE016
The same direction of the magnetic potential that produces and rotor magnetic potential can be by the control exciting current Regulate rotor flux.
Under rotating coordinate system, the state vector equation of induction motor is:
Figure 463009DEST_PATH_IMAGE020
（3）
In the formula
Figure 405557DEST_PATH_IMAGE022
,
Figure 905808DEST_PATH_IMAGE024
,
Figure 139475DEST_PATH_IMAGE026
,
Figure 612044DEST_PATH_IMAGE028
,
Figure 787811DEST_PATH_IMAGE030
Be stator current,
Figure 713041DEST_PATH_IMAGE032
Be rotor flux,
Figure 750399DEST_PATH_IMAGE034
Be the inverter angular frequency,
Figure 811896DEST_PATH_IMAGE036
Be motor angle speed,
Figure 158563DEST_PATH_IMAGE038
Be the motor mutual inductance,
Figure 571090DEST_PATH_IMAGE040
Be the stator self-induction,
Figure 409209DEST_PATH_IMAGE042
Be the rotor self-induction,
Figure 590791DEST_PATH_IMAGE044
Be rotor resistance.
To the state equation of the first motor, the second motor, merge:
Figure 842781DEST_PATH_IMAGE046
（4）
Equation (4) can be converted into following formula:
Figure 742604DEST_PATH_IMAGE048
（5）
In the equation
Figure 121764DEST_PATH_IMAGE050
, ,
Figure 846323DEST_PATH_IMAGE054
,
Figure 46491DEST_PATH_IMAGE056
,
Figure 416293DEST_PATH_IMAGE058
,
Figure 369205DEST_PATH_IMAGE060
,
Figure 166260DEST_PATH_IMAGE062
,
Figure 588145DEST_PATH_IMAGE064
,
Figure 761638DEST_PATH_IMAGE066
,
Figure 834636DEST_PATH_IMAGE068
Under motor self parameter and rotating speed same case of two parallel joins, equation (5) is identical with equation (3).
In state equation (5), the equation on the d axle is:
（6）
Because average rotor flux is definite value, so
Figure 714703DEST_PATH_IMAGE072
Be 0, by
Figure 426307DEST_PATH_IMAGE074
Direction is the d direction of principal axis, knows
Figure 353812DEST_PATH_IMAGE076
,
Figure 492669DEST_PATH_IMAGE078
, so equation (6) can be expressed as:
Figure 889146DEST_PATH_IMAGE080
（7）
From equation (7), can obtain with reference to the exciting current function:
Figure DEST_PATH_IMAGE134
（8）
According to formula (8), by the angular speed error With the actual rotor magnetic flux With
Figure 309260DEST_PATH_IMAGE088
As the reference exciting current that obtains with reference to input, with the exciting current size contrast that actual measurement obtains, the exciting current error that obtains is regulated the on off state of inverter as the reference input of the adjusting inverter of system.
Step 5, determine the torque reference current function
By regulating torque current in the vector control Control the electromagnetic torque of motor, in the d-q coordinate system, the electromagnetic torque equation is:
Figure 495708DEST_PATH_IMAGE090
（9）
Wherein
Figure 148538DEST_PATH_IMAGE092
Be the number of pole-pairs of motor, the electromagnetic torque equation that merges the first motor, the second motor gets:
Figure 629197DEST_PATH_IMAGE094
（10）
That is: (11)
In the formula
Figure 841053DEST_PATH_IMAGE098
,
Figure 345459DEST_PATH_IMAGE100
,
Figure 997020DEST_PATH_IMAGE102
,
Figure 104654DEST_PATH_IMAGE104
,
Figure 499863DEST_PATH_IMAGE106
If two motor self parameter is identical, so , then equation (11) is
Equation in the equation (10) in the d-q coordinate system is:
Figure 279097DEST_PATH_IMAGE112
（12）
By
Figure 477997DEST_PATH_IMAGE074
Direction is the d direction of principal axis, knows ,
Figure 953289DEST_PATH_IMAGE078
, so equation (12) can be expressed as:
Figure 769935DEST_PATH_IMAGE112
（13）
Can obtain the torque reference current function by equation (13):
Figure 506947DEST_PATH_IMAGE114
（14）
“ ﹡ Zhong above equation " the expression reference quantity, " ∧ " represents estimated value.
According to the torque current reference value that formula (14) obtains, with the torque current size contrast of actual measurement, the torque current error that obtains is as the reference input of the adjusting inverter of system.
Step 6, realization vector control
Such as Fig. 3, be the control system structure chart.System records respectively rotor speed and the magnetic flux of two motor by adaptive rotor flux observer, double motor is measured the respectively calculating of rotor flux and stator current mean value and difference, the process coordinate transform is in the d-q coordinate system, its output valve can be used as computing reference exciting current input value, is obtained with reference to exciting current by equation (8)
Figure 843382DEST_PATH_IMAGE118
Rotor speed value by the self adaptation flux observer is measured with given reference value contrast, obtains the torque of the deviation input PI controller amount of obtaining motor references, and obtains average torque
Figure DEST_PATH_IMAGE136
, then obtain the torque reference electric current according to equation (14)
Figure 335543DEST_PATH_IMAGE116
Reference current
Figure 139287DEST_PATH_IMAGE116
,
Figure 679990DEST_PATH_IMAGE118
With the actual current that obtains through measuring coordinate transform ,
Figure 720944DEST_PATH_IMAGE122
The deviate that contrast obtains is input in the PI controller, obtains reference voltage ,
Figure 341729DEST_PATH_IMAGE126
, after coordinate transform, the PWM inverter is controlled, regulate the stable operation of double motor.

Claims (1)

1. based on the single inverter of the Speedless sensor control method to the double-induction motivation, it is characterized in that the method may further comprise the steps:
Step 1, the stator current model that structure is new are selected control electric current object
Flowing to the motor total current by inverter is
Figure 2012103158592100001DEST_PATH_IMAGE002
, wherein, what flow to the first motor is
Figure 2012103158592100001DEST_PATH_IMAGE004
, what flow to the second motor is , now construct the motor average current
Figure 2012103158592100001DEST_PATH_IMAGE008
And difference between current
Figure 2012103158592100001DEST_PATH_IMAGE010
:
Figure 2012103158592100001DEST_PATH_IMAGE012
（1）
Figure 2012103158592100001DEST_PATH_IMAGE014
（2）
Select average current
Figure 225769DEST_PATH_IMAGE008
As control electric current object, motor speed and electromagnetic torque are regulated, in the present invention, and symbol "-" expression mean value, " △ " represents difference, and subscript 1 refers to the first motor, and subscript 2 refers to the second motor;
Step 2, selection motor feedback parameter
The control of employing Speedless sensor, selecting rotor speed and the rotor flux of double motor is feedback parameter, adopt two adaptive rotor flux observers, measure in real time respectively stator current and the voltage of two parallel running motor, be transformed under the two-phase static coordinate, and calculate respectively actual speed and the rotor flux of two motor, as the motor feedback parameter;
Step 3, set up new space vector coordinate system
Select the d direction of principal axis, set up the d-q rotating coordinate system, the rotor flux of two motor is expressed in rotating coordinate system, and synthetic to mean value and the difference vector of two motor rotor magnetic fluxs;
Step 4, definite with reference to the exciting current function
According to the field orientation principle, in vector control, respectively to the induction motor exciting current And torque current
Figure 2012103158592100001DEST_PATH_IMAGE018
Regulate, wherein direct-axis current
Figure 794154DEST_PATH_IMAGE016
The same direction of the magnetic potential that produces and rotor magnetic potential can be by the control exciting current
Figure 823421DEST_PATH_IMAGE016
Regulate rotor flux,
Under rotating coordinate system, the state vector equation of induction motor is:
（3）
In the formula
Figure 2012103158592100001DEST_PATH_IMAGE022
,
Figure 2012103158592100001DEST_PATH_IMAGE024
, ,
Figure DEST_PATH_IMAGE028
,
Figure DEST_PATH_IMAGE030
Be stator current,
Figure DEST_PATH_IMAGE032
Be rotor flux,
Figure DEST_PATH_IMAGE034
Be the inverter angular frequency,
Figure DEST_PATH_IMAGE036
Be motor angle speed,
Figure DEST_PATH_IMAGE038
Be the motor mutual inductance,
Figure DEST_PATH_IMAGE040
Be the stator self-induction,
Figure DEST_PATH_IMAGE042
Be the rotor self-induction,
Figure DEST_PATH_IMAGE044
Be rotor resistance,
To the state equation of the first motor, the second motor, merge:
Figure DEST_PATH_IMAGE046
（4）
Equation (4) can be converted into following formula:
Figure DEST_PATH_IMAGE048
（5）
In the equation
Figure DEST_PATH_IMAGE050
, ,
Figure DEST_PATH_IMAGE054
,
Figure DEST_PATH_IMAGE056
,
Figure DEST_PATH_IMAGE058
,
Figure DEST_PATH_IMAGE060
,
Figure DEST_PATH_IMAGE062
,
Figure DEST_PATH_IMAGE064
,
Figure DEST_PATH_IMAGE066
,
Figure DEST_PATH_IMAGE068
Under motor self parameter and rotating speed same case of two parallel joins, equation (5) is identical with equation (3),
In state equation (5), the equation on the d axle is:
Figure DEST_PATH_IMAGE070
（6）
Because average rotor flux is definite value, so Be 0, by
Figure DEST_PATH_IMAGE074
Direction is the d direction of principal axis, knows ,
Figure DEST_PATH_IMAGE078
, so equation (6) can be expressed as:
Figure DEST_PATH_IMAGE080
（7）
From equation (7), can obtain with reference to the exciting current function:
Figure DEST_PATH_IMAGE082
（8）
According to formula (8), by the angular speed error With the actual rotor magnetic flux
Figure DEST_PATH_IMAGE086
With
Figure DEST_PATH_IMAGE088
As the reference exciting current that obtains with reference to input, with the exciting current size contrast that actual measurement obtains, the exciting current error that obtains is regulated the on off state of inverter as the reference input of the adjusting inverter of system;
Step 5, determine the torque reference current function
By regulating torque current in the vector control
Figure 444940DEST_PATH_IMAGE018
Control the electromagnetic torque of motor, in the d-q coordinate system, the electromagnetic torque equation is:
Figure DEST_PATH_IMAGE090
（9）
Wherein
Figure DEST_PATH_IMAGE092
Be the number of pole-pairs of motor, the electromagnetic torque equation that merges the first motor, the second motor gets:
（10）
That is:
Figure DEST_PATH_IMAGE096
(11)
In the formula
Figure DEST_PATH_IMAGE098
,
Figure 2012103158592100001DEST_PATH_IMAGE100
,
Figure 2012103158592100001DEST_PATH_IMAGE102
,
Figure 2012103158592100001DEST_PATH_IMAGE104
,
Figure 2012103158592100001DEST_PATH_IMAGE106
If two motor self parameter is identical, so , then equation (11) is
Figure 2012103158592100001DEST_PATH_IMAGE110
,
Equation in the equation (10) in the d-q coordinate system is:
Figure DEST_PATH_IMAGE112
（12）
By
Figure 488769DEST_PATH_IMAGE074
Direction is the d direction of principal axis, knows
Figure 431317DEST_PATH_IMAGE076
,
Figure 682301DEST_PATH_IMAGE078
, so equation (12) can be expressed as:
（13）
Can obtain the torque reference current function by equation (13):
Figure 2012103158592100001DEST_PATH_IMAGE114
（14）
“ ﹡ Zhong above equation " the expression reference quantity, " ∧ " represents estimated value,
According to the torque current reference value that formula (14) obtains, with the torque current size contrast of actual measurement, the torque current error that obtains is as the reference input of the adjusting inverter of system;
Step 6, realization vector control
Reference current
Figure 2012103158592100001DEST_PATH_IMAGE116
,
Figure 2012103158592100001DEST_PATH_IMAGE118
With the actual current that obtains through measurement and coordinate transform
Figure 2012103158592100001DEST_PATH_IMAGE120
, The current deviation value that contrast obtains is input in the PI controller, obtains reference voltage
Figure 2012103158592100001DEST_PATH_IMAGE124
,
Figure 2012103158592100001DEST_PATH_IMAGE126
, after coordinate transform, the PWM inverter is controlled, regulate the stable operation of double motor.
CN2012103158592A 2012-08-30 2012-08-30 Control method to dual induction motor on the basis of single inverter with non-velocity sensor Pending CN102857169A (en)

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Publication number Priority date Publication date Assignee Title
CN109039167A (en) * 2018-08-20 2018-12-18 中南大学 A kind of internal permanent magnet synchronous motor control method and system
CN111656674A (en) * 2018-09-27 2020-09-11 东芝三菱电机产业系统株式会社 Control device and control method for power conversion device, and motor drive system
CN111656674B (en) * 2018-09-27 2023-10-13 东芝三菱电机产业系统株式会社 Control device, control method, and motor drive system for power conversion device
CN111865165A (en) * 2020-08-03 2020-10-30 上海电气风电集团股份有限公司 Control method, system, medium and electronic device of squirrel-cage asynchronous generator
CN111865165B (en) * 2020-08-03 2021-07-30 上海电气风电集团股份有限公司 Control method, system, medium and electronic device of squirrel-cage asynchronous generator

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Application publication date: 20130102