CN101465617A - Vector control technology and device for power unit cascade type high voltage frequency changer - Google Patents
Vector control technology and device for power unit cascade type high voltage frequency changer Download PDFInfo
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- CN101465617A CN101465617A CNA2008100492227A CN200810049222A CN101465617A CN 101465617 A CN101465617 A CN 101465617A CN A2008100492227 A CNA2008100492227 A CN A2008100492227A CN 200810049222 A CN200810049222 A CN 200810049222A CN 101465617 A CN101465617 A CN 101465617A
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- motor
- high voltage
- vector control
- voltage frequency
- control technology
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Abstract
The invention discloses a vector control technology for high-voltage frequency converter with series-connected power units; acquired speed data and current data of a motor are transmitted to a control circuit of a high-voltage frequency converter; field current and torque current of an ac asynchronous motor are uncoupled and controlled respectively; then the output data is transmitted to the control ends of power units to enable the ac motor to obtain similar mechanical characteristic of a dc motor. The vector control technology and the device thereof for a high-voltage frequency converter with series-connected power units adopt the technical proposal, a driven high-voltage ac motor is enabled to obtain similar output torque characteristic of a dc motor in each frequency range; the output torque characteristic of high-voltage ac motor is effectively improved; the vector control technology provides a solution for four-quadrant frequency-conversion operation of a high-voltage high-power ac asynchronous motor, and the torque characteristic of motors is effectively improved.
Description
Technical field
The invention belongs to electric and electronic technical field, particularly relate to a kind of method and apparatus that vector control technology is applied to the tandem type high voltage converter.
Background technology
At present, power unit cascade type high voltage frequency changer, the general VVVF control mode of Cai Yonging, the dynamic responding speed of this control mode is slow, low frequency output torque characteristics is poor, can only be applicable to the frequency control of blower fan, pump-type load.
Summary of the invention
The purpose of this invention is to provide a kind of control precision height, response accuracy is fast, be applicable to the vector control technology of power unit cascade type high voltage frequency changer and adopt the power unit cascade type high voltage frequency changer of this technology.
The present invention is by the following technical solutions:
The present invention will collect the speed data of motor and the control circuit that current data is delivered to high voltage converter, by with control respectively after the exciting current of AC asynchronous motor and the torque current decoupling zero, then dateout is delivered to the control end of each power cell, made alternating current motor obtain the similar mechanical property of DC motor.
In control circuit, be provided with the closed-loop control of speed feedback.
The signal of telecommunication that detects motor is delivered in the controller, controlled the output of each power cell by controller; Adopt vector control technology that the excitation component and the torque component of motor are carried out decoupling zero in the controller, control this two component respectively and make motor obtain low speed high torque.
Be provided with velocity transducer on the axle of motor, velocity transducer links to each other with vector controller, constitutes the feedback closed loop circuit thus.
Adopt the vector control technology and the device thereof of the power unit cascade type high voltage frequency changer of technique scheme, can make the high voltage motor of driving obtain the output torque characteristics similar to DC motor at each frequency band, effectively improved the output torque characteristics of high voltage motor, this technology provides solution for the four-quadrant converting operation of high-power AC asynchronous motor, has effectively improved the torque characteristics of motor.
Description of drawings
Fig. 1 is the phasor diagram of asynchronous motor of the present invention;
Fig. 2 is a principle of vector control block diagram of the present invention;
Fig. 3 is an overall structure schematic diagram of the present invention.
Embodiment
Embodiment 1
A kind of vector control technology of power unit cascade type high voltage frequency changer, the control circuit that the speed data of gathering and current data are delivered to high voltage converter, by with control respectively after the exciting current of AC asynchronous motor and the torque current decoupling zero, then dateout is delivered to the control end of each power cell.
Torque formula T=C from asynchronous motor
Tφ
mI
2Cos ψ
2As can be seen, the torque of asynchronous motor is by asynchronous motor air-gap flux φ
mReal component I with rotor current
2Cos ψ
2Interaction produces.The rotor current I of asynchronous motor
2Size depend on power factor cos ψ
2, and power factor follows the revolutional slip of motor that relation is arranged.From the phasor diagram of Fig. 1 asynchronous motor as can be seen, rotor flux ψ
2With rotor current I
290 ° of phase phasic differences, because the proportionate relationship that magnetic flux and magnetic linkage become to fix, so there is φ
2=φ
mCos ψ
2, substitution torque formula can get: T=C
Tφ
mI
2Cos ψ
2=C
Tφ
2I
2If manage to keep the rotor flux ψ of asynchronous motor
2Constant, then the torque T of motor just and rotor current I
2Be directly proportional, asynchronous motor can reach higher dynamic speed adjustment performance too.
As shown in Figure 1, stator current, voltage and the main magnetic linkage of asynchronous motor transform to the two-phase rotating coordinate system with rotor flux linkage orientation under the three phase static coordinate system, and promptly the M-T coordinate system can be realized rotor flux ψ
2Constant.T axle and M axle quadrature in the M-T coordinate system, the M axle is got rotor flux ψ
2Phasor orientation, T axle and electric current I
T1=-I
2Direction identical.
By mathematical derivation, under the M-T coordinate system, stator current is broken down into two quadrature component I
M1And I
T1, rotor flux ψ
2To I
M1Response be first order inertial loop, torque T is to I
T1Be summary responses, therefore with I
M1The excitatory component that is called stator current, I
T1The torque component that is called stator current.As long as in speed regulation process, manage to keep rotor flux ψ
2Constant, just exist torque T to be proportional to I
T1, promptly to pass through to regulate I
T1Control the output torque of motor.Each power cell forms the three-phase symmetrical alternating current power supply that frequency continuous variable phase place mutual deviation 120 is spent by the phase shift ZAP, but this power supply drive motor is in 0～50Hz running, the basic principle of unit cascade type high voltage frequency changer vector control that Here it is.
As shown in Figure 1 and Figure 2, with the stator current I of threephase asynchronous under three phase coordinate systems
a, I
b, I
cBy the conversion of three-phase-two phase converter, equivalence becomes the alternating current I under the two-phase rest frame
α, I
β, again by rotor field-oriented rotation transformation, equivalence becomes the direct current I under the synchronous rotating frame
d, I
q(I
dBe equivalent to DC motor exciting current, be the I among Fig. 1
M1I
qBe equivalent to the armature supply that is directly proportional with torque, i.e. I among Fig. 1
T1), and then with given exciting current I
d* with torque current I
q* subtract each other respectively, form the direct voltage V under the synchronous rotating frame after its difference is regulated through PI respectively
dAnd V
q, V
dAnd V
qPass through the inverse transformation of rotor field-oriented rotation again, form the direct voltage V under the two-phase rest frame
αAnd V
β, these two direct voltages again through phase-shift control circuit, are controlled each power cell of each phase by behind the SVPWM respectively, thereby regulate the three-phase output of high voltage converter, the operation of control motor.
The essence of vector control is that the alternating current motor equivalence is DC motor, and respectively to speed, two components in magnetic field carry out independent control.By control rotor flux ψ
2, decompose stator current then and obtain torque I
qWith magnetic field I
dTwo components through coordinate transform, are realized quadrature or decoupling zero control.
As shown in Figure 3, a kind of is the power unit cascade type high voltage frequency changer of implementing the employing vector control technology of this method, to deliver in the vector controller through the signal of telecommunication of power cell, and in vector controller, adopt vectoring technology that rate signal and current signal are carried out the decoupling zero processing; Vector controller links to each other with each power cell.
As Fig. 2, shown in Figure 3, among the present invention, can also be in control circuit, the closed-loop control of the feedback that gathers way is avoided owing to the unstable error of bringing of output waveform with this.
For implementing the vector control technology power unit cascade type high voltage frequency changer that this method adopts, on the axle of motor, be provided with velocity transducer, velocity transducer links to each other with vector controller, constitutes the feedback closed loop circuit thus.
Other technical scheme is identical with embodiment 1.
Claims (4)
1, a kind of vector control technology of power unit cascade type high voltage frequency changer, it is characterized in that: will collect the speed data of motor and the control circuit that current data is delivered to high voltage converter, by with control respectively after the exciting current of AC asynchronous motor and the torque current decoupling zero, then dateout is delivered to the control end of each power cell, made alternating current motor obtain the similar mechanical property of DC motor.
2, the vector control technology of power unit cascade type high voltage frequency changer according to claim 1 is characterized in that: in described control circuit, be provided with the closed-loop control of speed feedback.
3, a kind of power unit cascade type high voltage frequency changer for the employing vector control technology of implementing this method as claimed in claim 1, it is characterized in that: the signal of telecommunication that will detect motor is delivered in the controller, is controlled the output of each power cell by controller; Adopt vector control technology that the excitation component and the torque component of motor are carried out decoupling zero in the controller, control this two component respectively and make motor obtain low speed high torque.
4, the power unit cascade type high voltage frequency changer of employing vector control according to claim 3 is characterized in that: be provided with velocity transducer on the axle of motor, velocity transducer links to each other with vector controller, constitutes the feedback closed loop circuit thus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100492227A CN101465617A (en) | 2008-02-13 | 2008-02-13 | Vector control technology and device for power unit cascade type high voltage frequency changer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100492227A CN101465617A (en) | 2008-02-13 | 2008-02-13 | Vector control technology and device for power unit cascade type high voltage frequency changer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101465617A true CN101465617A (en) | 2009-06-24 |
Family
ID=40806011
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008100492227A Pending CN101465617A (en) | 2008-02-13 | 2008-02-13 | Vector control technology and device for power unit cascade type high voltage frequency changer |
Country Status (1)
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|---|---|
| CN (1) | CN101465617A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101710821A (en) * | 2009-12-28 | 2010-05-19 | 南昌大学 | DC asynchronous motor universal vector control method and controller |
| CN104639009A (en) * | 2013-11-11 | 2015-05-20 | 北京动力源科技股份有限公司 | Vector control frequency converter and control method and device thereof |
-
2008
- 2008-02-13 CN CNA2008100492227A patent/CN101465617A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101710821A (en) * | 2009-12-28 | 2010-05-19 | 南昌大学 | DC asynchronous motor universal vector control method and controller |
| CN104639009A (en) * | 2013-11-11 | 2015-05-20 | 北京动力源科技股份有限公司 | Vector control frequency converter and control method and device thereof |
| CN104639009B (en) * | 2013-11-11 | 2018-02-06 | 北京动力源科技股份有限公司 | A kind of control method of vector control type frequency converter, device and a kind of vector control type frequency converter |
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Application publication date: 20090624 |