CN109167548A - A kind of Vector Control System of Induction Motor field orientation antidote and its system - Google Patents

A kind of Vector Control System of Induction Motor field orientation antidote and its system Download PDF

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Publication number
CN109167548A
CN109167548A CN201811078185.2A CN201811078185A CN109167548A CN 109167548 A CN109167548 A CN 109167548A CN 201811078185 A CN201811078185 A CN 201811078185A CN 109167548 A CN109167548 A CN 109167548A
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Prior art keywords
slip
voltage
current
axis
asynchronous machine
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朱伟进
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HUNAN VICRUNS ELECTRIC TECHNOLOGY Co Ltd
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HUNAN VICRUNS ELECTRIC TECHNOLOGY Co Ltd
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Priority to CN201811078185.2A priority Critical patent/CN109167548A/en
Publication of CN109167548A publication Critical patent/CN109167548A/en
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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
    • H02P21/24—Vector control not involving the use of rotor position or rotor speed sensors
    • H02P21/26—Rotor 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
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—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 using dc to ac converters or inverters
    • H02P27/08—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 using dc to ac converters or inverters with pulse width modulation
    • 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
    • H02P2207/00—Indexing scheme relating to controlling arrangements characterised by the type of motor
    • H02P2207/01—Asynchronous machines

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

Abstract

A kind of Vector Control System of Induction Motor field orientation antidote and its system.Wherein method includes: to obtain asynchronous machine threephase stator electric current ia、ibAnd icAnd motor angular velocity ωr；By electric current ia、ibAnd icIt converts to obtain d shaft current i by 3s/2rsdWith q shaft current isq, and output voltage amplitude U is calculated by the voltage equation of asynchronous machines；Calculate asynchronous machine slip angular velocity increment coefficient KslipWith slip angular velocity ωslip；It calculates asynchronous machine d axis and controls voltageQ axis controls voltageWith dq axis resultant voltageAnd according toWithThe hair wave processing of SVPWM space vector pulse width modulation is carried out, to control motor operation.The present invention is the Vector Control System of Induction Motor field orientation correction based on voltage observation, controls voltage by calculating d, q axis Carry out the hair wave processing of SVPWM space vector pulse width modulation, to control motor operation, it solves the problems, such as to be difficult to accurately obtain in real time due to rotor parameters in rotor that field orientation is caused to be not allowed, and combines the observation of d, q shaft voltage, can realize accurate Magnetic oriented in full speed range.

Description

A kind of Vector Control System of Induction Motor field orientation antidote and its system
Technical field
This application involves motor control technology fields, correct more particularly to a kind of Vector Control System of Induction Motor field orientation Method and its system.
Background technique
Current ac three-phase asynchronous motor, due to being widely used in good control performance and dynamic response In AC Drive field.During implementing Vector Control System of Induction Motor, one of crucial step will calculate motor Slip frequency.
It calculates slip frequency and needs to obtain accurate rotor parameters in rotor.In practical applications, one side rotor is joined Number is difficult to accurately obtain, and especially for heavy-duty motor, due to its rotor resistance inductance parameters very little, parameter of electric machine identification is missed Difference is bigger；Another aspect rotor resistance is affected by motor temperature, and motor slip frequency can change in larger range. If slip frequency calculates inaccuracy, it is inaccurate that field orientation can be directly contributed, and then stator current is caused to deviate design value, motor Operate in underexcitation or overexcitation state.
In view of the above-mentioned problems, scientific and technical personnel propose a series of solutions, wherein utilizing model reference adaptive principle Construction field orientation correction system is widely adopted, and mainly includes following methods:
(1) the rotor field-oriented antidote based on flux observation is constructed；
(2) the rotor field-oriented antidote based on reactive power is constructed；
(3) the rotor field-oriented antidote observed based on torque is constructed；
(4) the rotor field-oriented antidote observed based on d shaft voltage is constructed.
Wherein, method (1) and (2) need directly to observe rotor flux, and the precision of observation is influenced vulnerable to rotor parameter, and is counted Calculation process is complicated；
Method (3) needs during calculating torque using inductor rotor although not needing directly to observe rotor flux And stator magnetic linkage, and inductor rotor and stator magnetic linkage are difficult to accurately calculate in practical applications, so the practicability of method is not By force；
Method (4) need to only calculate d shaft voltage, calculate simple.But the method is only observed d shaft voltage, does not take into account q Shaft voltage, therefore it is inaccurate to be easy to cause field orientation in practical applications, and the adaptive law of the method is introduced based on synchronizing band The switching signal of rate can not carry out field orientation correction in low frequency.
In summary, full well from being unable in place of the equal Shortcomings of the field orientation antidote of the prior art The vast demand of foot society.
Summary of the invention
The present invention in order to solve the above problems existing in the present technology, it is fixed to provide a kind of Vector Control System of Induction Motor magnetic field To antidote and its system, main purpose is to overcome prior art defect, to solve existing asynchronous machine since motor turns Subparameter is difficult to the technical problem that accurate acquisition causes field orientation inaccurate in real time.
A kind of Vector Control System of Induction Motor field orientation antidote, the described method comprises the following steps:
S1, asynchronous machine threephase stator electric current i is obtaineda、ibAnd ic, and obtain motor angular velocity ωr；
S2, by asynchronous machine threephase stator electric current ia、ibAnd icIt is converted by 3s/2r, obtains d shaft current isdWith q shaft current isq, and output voltage amplitude U is calculated by the voltage equation of asynchronous machines；
S3, by UsAs reference, asynchronous machine slip angular velocity increment coefficient K is calculatedslipWith slip angular velocity ωslip；
S4, asynchronous machine d axis control voltage is calculatedQ axis controls voltageWith dq axis resultant voltageAnd according toWithThe hair wave processing of SVPWM space vector pulse width modulation is carried out, to control motor operation.
As a further preferred embodiment of the present invention, in the step S1, asynchronous machine threephase stator electric current i is obtaineda、ib And ic, and obtain motor angular velocity ωrIt specifically includes:
Motor two-phase stator current i is obtained by current sensora、ib, motor angular velocity is obtained by velocity sensor ωr；
Third phase stator current i is calculated by composite formulac, calculation formula is as follows:
ic=-(ia+ib) (1)
As a further preferred embodiment of the present invention, in the step S2, asynchronous machine threephase stator electric current ia、ibAnd ic It is converted by 3s/2r, obtains d shaft current isdWith q shaft current isqIt specifically includes:
Utilize the threephase stator electric current i of acquisitiona、ibAnd ic, converted by 3s/2r, obtain the stator in static α β coordinate system Electric current isαAnd isβ, convert to obtain the d shaft current i of asynchronous machine under dq rotating coordinate system using α β/dqsdWith q shaft current isq, Calculation formula is as follows:
Wherein, θ is magnetic linkage angle.
As a further preferred embodiment of the present invention, the calculation formula of the magnetic linkage angle, θ is as follows:
Wherein, ω0For synchronous angular velocity, ωslipFor motor slip angular velocity, ωrFor motor angular rate, 1/S is integral The factor.
As a further preferred embodiment of the present invention, output voltage amplitude is calculated by following voltage equation in step S2 Us:
Wherein, Usd、UsqRespectively d axis, q axis stator voltage, isd、isqRespectively d axis, q axis stator current, ω0For synchronization Angular speed, RsFor stator resistance, LsFor stator inductance, σ is leakage inductance coefficient.
As a further preferred embodiment of the present invention, it is calculated by the following formula and calculates asynchronous machine slip angular velocity increment COEFFICIENT Kslip:
Wherein,For dq axis resultant voltage, 1/S is integrating factor, KpFor proportional gain, KiFor integral gain.
As a further preferred embodiment of the present invention, it is calculated by the following formula asynchronous machine slip angular velocity ωslip:
Wherein, TrFor rotor time constant,For speed ring adjustment module output setting torque current,It is encouraged for setting Magnetoelectricity stream.
As a further preferred embodiment of the present invention, it is calculated by the following formula asynchronous machine d axis control voltageq Axis controls voltageWith dq axis resultant voltage
Calculation formula is as follows:
Wherein, Kpd、KidRespectively d shaft current adjusts ratio, integral gain, Kpq、KiqRespectively q shaft current adjust ratio, Integral gain.
According to another aspect of the present invention, the present invention also provides asynchronous machine vectors described in a kind of execution any of the above-described The system for controlling field orientation antidote, which includes d shaft current ring adjustment module, q shaft current ring adjustment module, magnetic field Orient rectification module, slip speed computing module, SVPWM module and coordinate system transformation module, in which:
Coordinate system transformation module, the asynchronous machine threephase stator electric current i for will acquirea、ibAnd icAnd become by 3s/2r Get d shaft current i in returnsdWith q shaft current isq；
Field orientation rectification module, for according to d shaft current isdWith q shaft current isqMotor slip angular velocity is calculated Increment coefficient Kslip；
Slip speed computing module, for according to setting exciting currentWith setting torque currentAnd pass through slip public affairs Formula calculates theoretical slip angular velocity
D shaft current ring adjustment module is used for basisAnd isdD axis stator voltage is calculated
Q shaft current ring adjustment module is used for basisAnd isqQ axis control voltage is calculated
SVPWM module is used for basisWithThe hair wave processing of SVPWM space vector pulse width modulation is carried out, with control Motor operation.
Above-mentioned Vector Control System of Induction Motor field orientation antidote and its system, the asynchronous machine arrow based on voltage observation Amount control field orientation correction, controls voltage by calculating d, q axisCarry out the hair of SVPWM space vector pulse width modulation Wave processing, to control motor operation, solve causes since rotor parameters in rotor is difficult to accurate obtain in real time in the prior art The inaccurate problem of field orientation, is compared with the traditional method, and this method calculates simply, is convenient for without calculating motor magnetic linkage and torque Engineering application, and the observation of d, q shaft voltage is combined, accurate Magnetic oriented can be realized in full speed range, have good Practical value.
Detailed description of the invention
Fig. 1 is the method flow diagram that Vector Control System of Induction Motor field orientation antidote provides in one embodiment；
Fig. 2 is the structural block diagram that Vector Control System of Induction Motor field orientation correction system provides in one embodiment.
Specific embodiment
It is with reference to the accompanying drawings and embodiments, right in order to which the objects, technical solutions and advantages of the application are more clearly understood The application is further elaborated.It should be appreciated that specific embodiment described herein is only used to explain the application, not For limiting the application.
In one embodiment, as shown in Figure 1, providing a kind of Vector Control System of Induction Motor field orientation antidote, Method includes the following steps:
Step S1, asynchronous machine threephase stator electric current i is obtaineda、ibAnd ic, and obtain motor angular velocity ωr；
In step S1, asynchronous machine threephase stator electric current i is obtaineda、ibAnd ic, and obtain motor angular velocity ωrSpecifically Include:
Motor two-phase stator current i is obtained by current sensora、ib, and pass through velocity sensor acquisition motor angle speed Spend ωr；
Third phase stator current i is calculated by composite formulac, calculation formula is as follows:
ic=-(ia+ib) (1)
Certainly, provided herein is only a kind of preferred embodiment, obtains biphase current by current sensor, then pass through Simple algorithm obtains third phase stator current, and algorithm is simple, easy to operate.In specific implementation, current sense can also be passed through Device obtains asynchronous machine threephase stator electric current ia、ibAnd ic。
Step S2, by asynchronous machine threephase stator electric current ia、ibAnd icIt is converted by 3s/2r, obtains d shaft current isdWith q axis Electric current isq, and output voltage amplitude U is calculated by the voltage equation of asynchronous machines；
In step S2, asynchronous machine threephase stator electric current ia、ibAnd icIt is converted by 3s/2r, obtains d shaft current isdAnd q Shaft current isqIt specifically includes:
Utilize the threephase stator electric current i of acquisitiona、ibAnd ic, converted by 3s/2r, obtain the stator in static α β coordinate system Electric current isαAnd isβ, convert to obtain the d shaft current i of asynchronous machine under dq rotating coordinate system using α β/dqsdWith q shaft current isq, Calculation formula is as follows:
Wherein, θ is magnetic linkage angle, and the calculation formula of magnetic linkage angle, θ is as follows:
Wherein, ω0For synchronous angular velocity, 1/S is integrating factor.
In the above-mentioned methods, the synchronous angular velocity ω0Calculation formula it is as follows:
ω0=ωr+ωslip
Wherein, ωrFor asynchronous machine angular rate.
Voltage equation calculation formula in step S2 is as follows:
Wherein, Usd、UsqRespectively d axis, q axis stator voltage, isd、isqRespectively d axis, q axis stator current, ω0For synchronization Angular speed, RsFor stator resistance, LsFor stator inductance, σ is leakage inductance coefficient；
Step S3, by UsAs reference, asynchronous machine slip angular velocity increment coefficient K is calculatedslipAnd slip angular velocity ωslip, wherein asynchronous machine slip angular velocity increment coefficient KslipCalculation formula it is as follows:
Asynchronous machine slip angular velocity ωslipCalculation formula it is as follows:
Wherein,For dq axis resultant voltage, 1/S is integrating factor, KpFor proportional gain, KiFor integral gain, TrWhen rotor Between constant,For speed ring adjustment module output setting torque current,To set exciting current；
Step S4, it calculates asynchronous machine d axis and controls voltageQ axis controls voltageWith dq axis resultant voltageAnd According toWithThe hair wave processing of SVPWM space vector pulse width modulation is carried out, to control motor operation；
Wherein, asynchronous machine d axis is calculated in the following manner control voltageQ axis controls voltageIt is synthesized with dq axis Voltage
Wherein, Kpd、KidRespectively d shaft current adjusts ratio, integral gain, Kpq、KiqRespectively q shaft current adjust ratio, Integral gain.
Vector Control System of Induction Motor field orientation antidote of the invention and its system, the asynchronous electricity based on voltage observation The correction of machine vector controlled field orientation controls voltage by calculating d, q axisCarry out SVPWM space vector pulse width modulation The processing of hair wave solve in the prior art to control motor operation since rotor parameters in rotor is difficult to accurate in real time obtain The problem for causing field orientation inaccurate, is compared with the traditional method, and for this method without calculating motor magnetic linkage and torque, calculating is simple, Convenient for engineering application, and the observation of d, q shaft voltage is combined, can realize accurate Magnetic oriented in full speed range, have very Good practical value.
As shown in Fig. 2, the present invention also provides a kind of Vector Control System of Induction Motor field orientation correction system, the system packet Include d shaft current ring adjustment module, q shaft current ring adjustment module, field orientation rectification module, slip speed computing module, SVPWM Module and coordinate system transformation module,To set angular speed, ωrFor rotor angular speed,To set exciting current,For The setting torque current of speed ring adjustment module output, isdFor d axis stator current, isqFor q axis stator current,For d shaft current The d axis of ring adjustment module output controls voltage,Q axis to be exported by q shaft current ring adjustment module controls voltage,For Theoretical slip angular velocity, ωslipFor motor slip angular velocity, KslipTo be turned by the calculated motor of field orientation rectification module Declinate speed increment coefficient, ω0Indicate synchronous angular velocity, θ is magnetic linkage angle.
Wherein:
Coordinate system transformation module, the asynchronous machine threephase stator electric current i for will acquirea、ibAnd icAnd become by 3s/2r Get d shaft current i in returnsdWith q shaft current isq；
In the coordinate system transformation module, it is calculated by the following formula to obtain d shaft current isdWith q shaft current isq:
Wherein, θ is magnetic linkage angle, and the calculation formula of the magnetic linkage angle, θ is as follows:
Wherein, ω0For synchronous angular velocity, ωslipFor motor slip angular velocity, ωrFor motor angular rate, 1/S is integral The factor.
Field orientation rectification module, for according to d shaft current isdWith q shaft current isqMotor slip angular velocity is calculated Increment coefficient Kslip；
The field orientation rectification module is calculated by the following formula and calculates asynchronous machine slip angular velocity increment coefficient Kslip:
Wherein,For dq axis resultant voltage, 1/S is integrating factor, KpFor proportional gain, KiFor integral gain.
Slip speed computing module, for according to setting exciting currentWith setting torque currentAnd pass through slip public affairs Formula calculates theoretical slip angular velocity
In the slip speed computing module, it is calculated by the following formula asynchronous machine slip angular velocity ωslip:
Wherein, TrFor rotor time constant,For speed ring output setting torque current,To set exciting current.Tool During body is implemented,It can be according to setting angular speedWith rotor angular velocity omegarIt is calculated.
D shaft current ring adjustment module is used for basisAnd isdD axis stator voltage is calculated
Q shaft current ring adjustment module is used for basisAnd isqQ axis control voltage is calculated
Above-mentioned d shaft current ring adjustment module and q shaft current ring adjustment module obtain in the following manner:
Wherein, Kpd、KidRespectively d shaft current adjusts ratio, integral gain, Kpq、KiqRespectively q shaft current adjust ratio, Integral gain.
SVPWM module is used for basisWithThe hair wave processing of SVPWM space vector pulse width modulation is carried out, with control Motor operation.
Above-mentioned Vector Control System of Induction Motor field orientation correction system, the Vector Control System of Induction Motor magnetic based on voltage observation Field orientation correction passes through and calculates d, q axis control voltageThe hair wave processing of SVPWM space vector pulse width modulation is carried out, To control motor operation, solving leads to field orientation since rotor parameters in rotor is difficult to accurate obtain in real time in the prior art Inaccurate problem, is compared with the traditional method, and for this method without calculating motor magnetic linkage and torque, calculating is simple, is convenient for engineering application, And the observation of d, q shaft voltage is combined, accurate Magnetic oriented can be realized in full speed range, there is good practical value.
Each technical characteristic of above embodiments can be combined arbitrarily, for simplicity of description, not to above-described embodiment In each technical characteristic it is all possible combination be all described, as long as however, the combination of these technical characteristics be not present lance Shield all should be considered as described in this specification.
The several embodiments of the application above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art It says, without departing from the concept of this application, various modifications and improvements can be made, these belong to the protection of the application Range.Therefore, the scope of protection shall be subject to the appended claims for the application patent.

Claims (9)

1. a kind of Vector Control System of Induction Motor field orientation antidote, which is characterized in that the described method comprises the following steps:
S1, asynchronous machine threephase stator electric current i is obtaineda、ibAnd ic, and obtain motor angular velocity ωr；
S2, by asynchronous machine threephase stator electric current ia、ibAnd icIt is converted by 3s/2r, obtains d shaft current isdWith q shaft current isq, And output voltage amplitude U is calculated by the voltage equation of asynchronous machines；
S3, by UsAs reference, asynchronous machine slip angular velocity increment coefficient K is calculatedslipWith slip angular velocity ωslip；
S4, asynchronous machine d axis control voltage is calculatedAxis controls voltageWith dq axis resultant voltageAnd according to WithThe hair wave processing of SVPWM space vector pulse width modulation is carried out, to control motor operation.
2. a kind of Vector Control System of Induction Motor field orientation antidote according to claim 1, which is characterized in that described In step S1, asynchronous machine threephase stator electric current i is obtaineda、ibAnd ic, and obtain motor angular velocity ωrIt specifically includes:
Motor two-phase stator current i is obtained by current sensora、ib, motor angular velocity ω is obtained by velocity sensorr；
Third phase stator current i is calculated by composite formulac, calculation formula is as follows:
ic=-(ia+ib) (1)
3. a kind of Vector Control System of Induction Motor field orientation antidote according to claim 2, which is characterized in that described In step S2, asynchronous machine threephase stator electric current ia、ibAnd icIt is converted by 3s/2r, obtains d shaft current isdWith q shaft current isq It specifically includes:
Utilize the threephase stator electric current i of acquisitiona、ibAnd ic, converted by 3s/2r, obtain the stator current in static α β coordinate system isαAnd isβ, convert to obtain the d shaft current i of asynchronous machine under dq rotating coordinate system using α β/dqsdWith q shaft current isq, calculate Formula is as follows:
Wherein, θ is magnetic linkage angle.
4. a kind of Vector Control System of Induction Motor field orientation antidote according to claim 3, which is characterized in that described The calculation formula of magnetic linkage angle, θ is as follows:
Wherein, ω0For synchronous angular velocity, ωslipFor motor slip angular velocity, ωrFor motor angular rate, 1/S be integral because Son.
5. a kind of Vector Control System of Induction Motor field orientation antidote according to claim 4, which is characterized in that step Output voltage amplitude U is calculated by following voltage equation in S2s:
Wherein, Usd、UsqRespectively d axis, q axis stator voltage, isd、isqRespectively d axis, q axis stator current, ω0For synchro angle speed Degree, RsFor stator resistance, LsFor stator inductance, σ is leakage inductance coefficient.
6. a kind of Vector Control System of Induction Motor field orientation antidote according to claim 5, which is characterized in that pass through Following formula calculates asynchronous machine slip angular velocity increment coefficient Kslip:
Wherein,For dq axis resultant voltage, 1/S is integrating factor, KpFor proportional gain, KiFor integral gain.
7. a kind of Vector Control System of Induction Motor field orientation antidote according to claim 6, which is characterized in that pass through Following formula calculates asynchronous machine slip angular velocity ωslip:
Wherein, TrFor rotor time constant,For speed ring adjustment module output setting torque current,For setting excitation electricity Stream.
8. a kind of Vector Control System of Induction Motor field orientation antidote according to claim 7, which is characterized in that pass through Following formula calculates asynchronous machine d axis and controls voltageQ axis controls voltageWith dq axis resultant voltage
Calculation formula is as follows:
Wherein, Kpd、KidRespectively d shaft current adjusts ratio, integral gain, Kpq、KiqRespectively q shaft current adjusts ratio, integral Gain.
9. the system that a kind of perform claim requires any one of 1 to the 8 Vector Control System of Induction Motor field orientation antidote, It is characterized in that, including d shaft current ring adjustment module, q shaft current ring adjustment module, field orientation rectification module, slip speed meter Calculate module, SVPWM module and coordinate system transformation module, in which:
Coordinate system transformation module, the asynchronous machine threephase stator electric current i for will acquirea、ibAnd icAnd it is converted by 3s/2r To d shaft current isdWith q shaft current isq；
Field orientation rectification module, for according to d shaft current isdWith q shaft current isqMotor slip angular velocity increment system is calculated Number Kslip；
Slip speed computing module, for according to setting exciting currentWith setting torque currentAnd it is calculated by slip formula Theoretical slip angular velocity
D shaft current ring adjustment module is used for basisAnd isdD axis stator voltage is calculated
Q shaft current ring adjustment module is used for basisAnd isqQ axis control voltage is calculated
SVPWM module is used for basisWithThe hair wave processing of SVPWM space vector pulse width modulation is carried out, to control motor Operation.
CN201811078185.2A 2018-09-16 2018-09-16 A kind of Vector Control System of Induction Motor field orientation antidote and its system Pending CN109167548A (en)

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CN109782173B (en) * 2019-03-25 2021-07-16 中车青岛四方车辆研究所有限公司 Asynchronous motor excitation mutual inductance curve measuring system and measuring method thereof
CN110474362A (en) * 2019-07-11 2019-11-19 广东明阳龙源电力电子有限公司 A kind of low voltage ride through control method and system for high-voltage large-capacity frequency converter
CN110474362B (en) * 2019-07-11 2023-08-25 广东明阳龙源电力电子有限公司 Low-voltage ride through control method and system for high-voltage high-capacity frequency converter
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CN110855208A (en) * 2019-11-06 2020-02-28 中冶赛迪电气技术有限公司 High-voltage frequency converter speedless sensor vector control system
CN110855208B (en) * 2019-11-06 2021-05-11 中冶赛迪电气技术有限公司 High-voltage frequency converter speedless sensor vector control system
CN112811330A (en) * 2019-11-15 2021-05-18 湖南沃森电气科技有限公司 Control method and system for slewing mechanism of tower crane
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Application publication date: 20190108