CN110112988A - Three-level Converter model predictive control method, controller and system - Google Patents
Three-level Converter model predictive control method, controller and system Download PDFInfo
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- CN110112988A CN110112988A CN201910414915.XA CN201910414915A CN110112988A CN 110112988 A CN110112988 A CN 110112988A CN 201910414915 A CN201910414915 A CN 201910414915A CN 110112988 A CN110112988 A CN 110112988A
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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
- 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
- H02P27/12—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 pulsing by guiding the flux vector, current vector or voltage vector on a circle or a closed curve, e.g. for direct torque control
Abstract
Present disclose provides three-level Converter model predictive control method, controller and systems.Wherein, three-phase tri-level frequency conversion speed-adjusting system model predictive control method, comprising: the topologically corresponding space voltage vector of three-phase tri-level frequency converter is divided into 12 sectors；Determine sector belonging to the current output voltage vector of three-phase tri-level frequency converter；According to the upside capacitance voltage of three-phase tri-level frequency converter topology and the symbol of downside capacitance voltage difference and the direction of each phase current, space voltage vector needed for determining the current sector that balance control DC side mid-point voltage can be achieved；In space voltage vector needed for from current sector, selecting makes the smallest space voltage vector of cost function；Wherein, cost function be space voltage vector and current output voltage vector respectively on α β axis the difference of component modulus value；Using the switch state for the space voltage vector control three-phase tri-level frequency converter selected, the variable frequency regulating speed control of motor is realized.
Description
Technical field
The disclosure belongs to power electronics control field more particularly to a kind of three-level Converter Model Predictive Control
Method, controller and system.
Background technique
Only there is provided background technical informations relevant to the disclosure for the statement of this part, it is not necessary to so constitute first skill
Art.
Alternating current generator is because the advantages such as its structure is simple, durable, reliable, cheap, manufacture is easy are in blower, the pump exchanges tune such as class
It is widely applied in fast field.The Alternating Current Governor System of early stage is using sides such as rotor loop string resistance, the decompressions of stator circuit
Formula realizes speed-regulating function, but these method power consumptions are big, control effect is poor.With the development of power electronics technology, there is exchange to become
The frequency converter of frequency speed-regulating function plays important function in Alternating Current Governor System, especially suitable for for the purpose of energy-saving
AC speed regulating occasion.
In frequency converter, three-phase two-level inverter is common circuit topology.Compared with two level topological structures, two poles
Pipe clamps three-phase tri-level frequency converter with output level number is more, output waveform harmonic wave is few, switching tube voltage and current stress
The advantages such as small are widely applied in high-power AC speed regulating field.But in three-level topology structure, DC side
There are two capacitor, when application, must make the balance of voltage on two capacitors by control method or modulator approach.It is unbalanced
DC capacitor voltage not only reduces the performance and efficiency of system, also reduces the service life of switching device.Inventors have found that
In the three-level converter topological structure of three-level Converter, when empty load of motor, underloading, the slow-speed of revolution and DC injection braking
When, realize that the balance of DC side mid-point voltage controls according to the small vector of redundancy, the influence of small vector alignment current potential is not
Determining, it is difficult to select suitable small vector control neutral point voltage balance.
Summary of the invention
To solve the above-mentioned problems, the first aspect of the disclosure provides a kind of three-level Converter model prediction
Control method considers DC capacitor voltage size and each phase current direction, direct current when realizing various operating conditions operation simultaneously
The control of side neutral-point potential balance and the variable frequency regulating speed control of motor.
To achieve the goals above, the disclosure adopts the following technical scheme that
A kind of three-level Converter model predictive control method, the three-level Converter include three-phase
Three-level converter and motor, the control method, comprising:
The topologically corresponding space voltage vector of three-phase tri-level frequency converter is divided into 12 sectors；
Determine sector belonging to the current output voltage vector of three-phase tri-level frequency converter；
Symbol and each phase according to the upside capacitance voltage of three-phase tri-level frequency converter topology with downside capacitance voltage difference
Sense of current, space voltage vector needed for determining the current sector that balance control DC side mid-point voltage can be achieved；
In space voltage vector needed for from current sector, selecting makes the smallest space voltage vector of cost function；Wherein,
Cost function be space voltage vector and current output voltage vector respectively in three-phase static coordinate system on α β axis component difference
Modulus value；
Using the switch state for the space voltage vector control three-phase tri-level frequency converter selected, the frequency conversion tune of motor is realized
Speed control.
To solve the above-mentioned problems, the second aspect of the disclosure provides a kind of controller, considers DC bus capacitor electricity
Size and each phase current direction are pressed, the control of DC side neutral-point potential balance and motor when realizing various operating conditions operation simultaneously
Variable frequency regulating speed control.
To achieve the goals above, the disclosure adopts the following technical scheme that
A kind of controller is connected with three-phase tri-level frequency converter, and three-phase tri-level frequency converter is connected to the motor；The control
Device processed, comprising:
Sector division module is used to the topologically corresponding space voltage vector of three-phase tri-level frequency converter being divided into 12
Sector；
Sector determining module is used to determine sector belonging to the current output voltage vector of three-phase tri-level frequency converter；
Space voltage vector determining module needed for sector is used for the upper lateral capacitance according to three-phase tri-level frequency converter topology
Voltage and the symbol of downside capacitance voltage difference and the direction of each phase current determine and balance control DC side mid-point voltage can be achieved
Current sector needed for space voltage vector；
Space voltage vector screening module is used for from space voltage vector needed for current sector, and selecting makes to be worth
The smallest space voltage vector of function；Wherein, cost function is space voltage vector and current output voltage vector respectively three
In phase rest frame on α β axis the difference of component modulus value；
Variable frequency regulating speed control module is used for opening using the space voltage vector control three-phase tri-level frequency converter selected
Off status realizes the variable frequency regulating speed control of motor.
To solve the above-mentioned problems, a kind of three-level Converter is provided in terms of the third of the disclosure, considered
DC capacitor voltage size and each phase current direction, DC side neutral-point potential balance when realizing various operating conditions operation simultaneously
The variable frequency regulating speed control of control and motor.
To achieve the goals above, the disclosure adopts the following technical scheme that
A kind of three-level Converter, including controller described above.
The beneficial effect of the disclosure is:
(1) space voltage vector by being divided into the methods of 12 sectors by the disclosure, so that the valence in a switch periods
The calculation times of value function have been reduced to 4 times from 27 times, greatly reduce three-level Converter Model Predictive Control side
The calculation amount of method, improves control efficiency；And Model Predictive Control principle is used, realize fast response time, simple, easily
Understand.
(2) cost function of the disclosure is space voltage vector and current output voltage vector respectively in three phase static coordinate
In system on α β axis the difference of component modulus value, avoid the introducing of weight coefficient in cost function, reduce the complexity of algorithm.
(3) disclosure space voltage needed for determining the current sector that balance control DC side mid-point voltage can be achieved is sweared
When amount, DC capacitor voltage is not only allowed for, it is also contemplated that the current direction of small vector, so not only in motor nominal situation
It can be effectively controlled neutral-point potential balance when operation, and in empty load of motor, light running, slow-speed of revolution operation even DC injection braking etc.
Damage also has effective DC side neutral-point voltage balance effect when running.
Detailed description of the invention
The Figure of description for constituting a part of this disclosure is used to provide further understanding of the disclosure, and the disclosure is shown
Meaning property embodiment and its explanation do not constitute the improper restriction to the disclosure for explaining the disclosure.
Fig. 1 is the diode clamping tri-level Alternating Current Governor System main circuit diagram that the embodiment of the present disclosure provides；
Fig. 2 is the three level space voltage vector-diagrams that the embodiment of the present disclosure provides；
Fig. 3 is the asynchronous motor equivalent circuit diagram that the embodiment of the present disclosure provides；
Fig. 4 is VVVF speed regulation (VVVF) control block diagram that the embodiment of the present disclosure provides；
Fig. 5 (a) is the influence embodiment 1 for the small vector alignment voltage that the embodiment of the present disclosure provides；
Fig. 5 (b) is the influence embodiment 2 for the small vector alignment voltage that the embodiment of the present disclosure provides；
Fig. 5 (c) is the influence embodiment 3 for the small vector alignment voltage that the embodiment of the present disclosure provides；
Fig. 5 (d) is the influence embodiment 4 for the small vector alignment voltage that the embodiment of the present disclosure provides；
Fig. 6 is the control flow for the three-level Converter model predictive control method that the embodiment of the present disclosure provides
Figure.
Specific embodiment
The disclosure is described further with embodiment with reference to the accompanying drawing.
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the disclosure.Unless another
It indicates, all technical and scientific terms used herein has usual with disclosure person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the disclosure.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
Term is explained:
VVVF is the abbreviation of Variable Voltage and Variable Frequency, is meant: variable voltage, can
Frequency, that is, frequency conversion speed-adjusting system.The inverter connection motor of VVVF control is reached by changing simultaneously frequency and voltage
To the purpose of magnetic flux constant (back-emf/frequency approximation characterization can be used) and control motor speed (directly proportional with frequency), so
It applies in frequency converter more, belongs to industrial automation.
As shown in Figure 1, the control object of the present embodiment is diode clamping tri-level frequency convertor system.
The system includes following part:
(1) main circuit is diode clamping tri-level inverter, shares 12 IGBT switching tubes and 6 clamp diodes；
(2) DC side contains there are two series capacitance, one neutral point O of formation among two capacitors, and the two of every phase bridge arm
The centre of a clamp diode is connected with neutral point O, and this topology can produce+Udc/2、-Udc/ 2,0 three kind of level；Wherein,
UdcIt is the DC input voitage of three-level inverter.
(3) exchange flanks three-phase AC asynchronous motor.
In three-phase tri-level topology, every phase generates three state, and three-phase shares 27 kinds of states, and switch function is defined as follows:
Switch function and bridge arm output voltage and output state are as shown in Table I:
The relationship of Table I bridge arm output voltage, output state and switch function
Wherein, upAnd unPhysical meaning respectively indicate upside capacitance voltage and downside capacitance voltage.
The topologically corresponding space voltage vector of three-phase tri-level is as shown in Fig. 2, according to the amplitude of vector, space voltage vector
Big vector, middle vector, small vector and zero vector can be divided into, as shown in Table II.Wherein small vector and middle vector are in DC side
Point current potential has an impact, and the influence of middle vector alignment current potential is uncertain, so realizing that the balance of midpoint potential controls with small vector.
The classification of Table II space voltage vector
DC voltage is become the adjustable alternating voltage of three-phase by three-level converter, to control the revolving speed of motor.This implementation
Example uses VVVF AC speed regulating control strategy.
As the number of pole-pairs n of motorpOne timing, the synchronous rotational speed n of motor1With frequency converter output voltage frequency f1Relationship are as follows:
The virtual value of the every phase stator electromotive force of threephase asynchronous are as follows:
Eg=4.44f1NKΦm (3)
Wherein, Eg: the virtual value of air-gap flux induced electromotive force in every phase stator；N: the series connection circle of the every phase winding of stator
Number；K: stator fundamental wave winding coefficient；Φm: every grade of air-gap flux amount.
Fig. 3 is asynchronous motor equivalent circuit diagram.Wherein Ur *For stator voltage (namely frequency converter output voltage).When suddenly
When omiting the pressure drop on stator resistance and stator leakage reactance, haveThat is:
By formula (4) it is found that VVVF variable frequency regulating speed control mode is usually to guaranteeValue be definite value, realize every pole gas
Gap magnetic flux is constant.By changing stator voltageChange f1Realize the purpose of frequency control.This control mode is to ignore
It is obtained on the basis of pressure drop on stator resistance and leakage reactance, but in low frequency, these pressure drops cannot be ignored.At this time, it may be necessary to
Low-frequency compensation, i.e. frequency converter should have the function of direct current output.
Wherein, using VVVF speed regulation mode, compared with the speed regulating method of stator string resistance, low, energy-saving effect is lost
It is good.
Fig. 4 is VVVF speed regulation control block diagram.As shown in Figure 4, the revolving speed for giving motor, can by formula (2) and (4)
To obtain the inverter output voltage needed at this time.By control switch function, the output voltage control of three-level converter is realized
System, and then realize the VVVF speed regulation control of motor.Three-level converter will not only realize variable frequency regulating speed control, also realize
The balance of DC side mid-point voltage controls.
When frequency converter operate in power factor it is higher when, negative small vector reduces downside capacitance voltage, on positive small vector reduces
Lateral capacitance voltage.But when frequency converter operates in low power applications, when such as unloaded, underloading or DC injection braking are run, at this time
The influence of small vector alignment current potential is inverted.The influence of small vector alignment current potential current direction corresponding with small vector
It is related, as shown in Fig. 5 (a)-Fig. 5 (d).As shown in Fig. 5 (a), work as up>unWhen, if ia> 0, it should POO be selected to reduce upside electricity
Hold voltage；As shown in Fig. 5 (b), work as up>unWhen, if ia< 0, it should ONN be selected to reduce upside capacitance voltage；Such as Fig. 5 (c) institute
Show, works as up<unWhen, if ia> 0, it should ONN be selected to reduce downside capacitance voltage；As shown in Fig. 5 (d), work as up<unWhen, if ia
< 0, it should POO be selected to reduce downside capacitance voltage.
At this point, DC side capacitance voltage up and down is not only considered, it is also contemplated that small vector current direction, realizes midpoint electricity
Effective control of pressure.
When the control method using model prediction, control and the DC side midpoint electricity of three-level converter output voltage are realized
When the balance control of pressure, the cost function of traditional definition are as follows:
Wherein, uαβWithIt is space voltage vector and frequency converter output voltage in three-phase static coordinate system on α β axis
Component, λ are weight coefficient；K is k-th of space voltage vector.
It is selected by calculating the cost function of 27 space voltage vectors so that cost function is the smallest according to formula (5)
Space voltage vector controls the switch state of three-level converter, realizes frequency converter as the output voltage of frequency converter at this time
Control.
Through above-mentioned analysis it is found that when switch function calculates, need to calculate 27 cost functions, about 27 times capacitor electricity
Press estimated value.In addition, the selection of weight coefficient influences system control performance, and selection course is cumbersome.
In order to reduce these cumbersome interminable calculation amounts, space vector is divided by the present embodiment according to vector in big vector sum
12 sectors, as shown in Figure 2.The calculation times of cost function in this way have been reduced to 4 from 27.
In addition, the positive and negative small vector that the present embodiment also passes through redundancy realizes the balance control of mid-point voltage, at this point, not only keeping away
The use of weight coefficient is exempted from, the calculation times of cost function has also been reduced to 4.It should be noted that the present embodiment is selecting
When selecting small vector, DC capacitor voltage value is not only considered, it is also contemplated that the corresponding current direction of small vector.The present embodiment institute
The cost function of definition is
According to the above analysis, in different sectors, the vector for needing to calculate cost function is summarized as shown in Table III.
Required space voltage vector in Table III different sectors
Due to considering the current direction of small vector when small vector selects, so the influence of small vector alignment current potential can
With determination.The small vector selected at this time can be effectively controlled DC side mid-point voltage.Even if in the lower underloading of power factor, subtracting
It carries, the slow-speed of revolution and DC injection braking application, this method also can be effectively controlled DC side mid-point voltage.
As shown in fig. 6, the three-level Converter model predictive control method of the present embodiment, comprising:
Step 1: the topologically corresponding space voltage vector of three-phase tri-level frequency converter is divided into 12 sectors.
Specifically, it with maximum modulus value and is only second to the space voltage vector boundary of maximum modulus value, three-phase tri-level be become
The topologically corresponding space voltage vector of frequency device is divided into 12 sectors, as shown in Figure 2.
Step 2: determining sector belonging to the current output voltage vector of three-phase tri-level frequency converter.
Step 3: according to the symbol of the upside capacitance voltage of three-phase tri-level frequency converter topology and downside capacitance voltage difference
And the direction of each phase current, space voltage needed for determining the current sector that balance control DC side mid-point voltage can be achieved are sweared
Amount.
Space voltage vector required for can determine that different sectors according to Table III, then determine these space voltage vectors
During, it is contemplated that the upside capacitance voltage of three-phase tri-level frequency converter topology is with the symbol of downside capacitance voltage difference and respectively
The direction of phase current can be realized balance control DC side mid-point voltage, improve the stability of three-level Converter.
Step 4: in space voltage vector needed for from current sector, selecting makes the smallest space voltage arrow of cost function
Amount；Wherein, cost function is space voltage vector and current output voltage vector respectively in three-phase static coordinate system on α β axis
The modulus value of the difference of component；
Step 5: using the switch state for the space voltage vector control three-phase tri-level frequency converter selected, realizing motor
Variable frequency regulating speed control.
In specific implementation, guarantee that the every pole air-gap flux amount of motor is constant using VVVF method, by changing three-phase three
Level converter output voltage changes output voltage frequency, realizes the purpose of frequency control.
Wherein, the precondition of VVVF method is: ignoring the pressure drop on motor stator resistance and stator leakage reactance.
Space voltage vector by being divided into the method for 12 sectors by the present embodiment, so that being worth in a switch periods
The calculation times of function have been reduced to 4 times from 27 times, greatly reduce three-level Converter model predictive control method
Calculation amount, improve control efficiency；And Model Predictive Control principle is used, realize fast response time, simple, understandable.
The cost function of the present embodiment is space voltage vector and current output voltage vector respectively in three phase static coordinate
In system on α β axis the difference of component modulus value, avoid the introducing of weight coefficient in cost function, reduce the complexity of algorithm.
The present embodiment space voltage needed for determining the current sector that balance control DC side mid-point voltage can be achieved is sweared
When amount, DC capacitor voltage is not only allowed for, it is also contemplated that the current direction of small vector, so not only in motor nominal situation
It can be effectively controlled neutral-point potential balance when operation, and in empty load of motor, light running, slow-speed of revolution operation even DC injection braking etc.
Damage also has effective DC side neutral-point voltage balance effect when running.
In another embodiment, a kind of controller is additionally provided, is connected with three-phase tri-level frequency converter, three-phase tri-level
Frequency converter is connected to the motor.
The controller, comprising:
(1) sector division module is used to for the topologically corresponding space voltage vector of three-phase tri-level frequency converter being divided into
12 sectors；
Specifically, it in the sector division module, is sweared with maximum modulus value and the space voltage for being only second to maximum modulus value
Boundary is measured, the topologically corresponding space voltage vector of three-phase tri-level frequency converter is divided into 12 sectors, as shown in Figure 2.
(2) sector determining module is used to determine fan belonging to the current output voltage vector of three-phase tri-level frequency converter
Area；
(3) space voltage vector determining module needed for sector is used for the upside according to three-phase tri-level frequency converter topology
Capacitance voltage and the symbol of downside capacitance voltage difference and the direction of each phase current determine and balance control DC side midpoint can be achieved
Space voltage vector needed for the current sector of voltage.
Space voltage vector required for can determine that different sectors according to Table III, then determine these space voltage vectors
During, it is contemplated that the upside capacitance voltage of three-phase tri-level frequency converter topology is with the symbol of downside capacitance voltage difference and respectively
The direction of phase current can be realized balance control DC side mid-point voltage, improve the stability of three-level Converter.
(4) space voltage vector screening module is used for from space voltage vector needed for current sector, and selecting makes valence
The smallest space voltage vector of value function；Wherein, cost function is that space voltage vector and current output voltage vector exist respectively
In three-phase static coordinate system on α β axis the difference of component modulus value；
(5) variable frequency regulating speed control module is used to utilize the space voltage vector control three-phase tri-level frequency converter selected
Switch state, realize the variable frequency regulating speed control of motor.
Specifically, in the variable frequency regulating speed control module, guarantee the every pole air-gap flux amount of motor using VVVF method
It is constant, change output voltage frequency by changing three-phase tri-level frequency converter output voltage, realizes the purpose of frequency control.
Wherein, the precondition of VVVF method is: ignoring the pressure drop on motor stator resistance and stator leakage reactance.
In another embodiment, a kind of three-level AC stream frequency conversion speed-adjusting system is additionally provided comprising control described above
Device processed.
The three-level AC stream frequency conversion speed-adjusting system of the present embodiment has alternating voltage output level number more, and harmonic content is few,
The small advantage of the voltage stress of switching tube is particularly suitable for high-power application.
The foregoing is merely preferred embodiment of the present disclosure, are not limited to the disclosure, for the skill of this field
For art personnel, the disclosure can have various modifications and variations.It is all within the spirit and principle of the disclosure, it is made any to repair
Change, equivalent replacement, improvement etc., should be included within the protection scope of the disclosure.
Claims (9)
1. a kind of three-level Converter model predictive control method, the three-level Converter includes three-phase three
Level converter and motor, which is characterized in that the control method, comprising:
The topologically corresponding space voltage vector of three-phase tri-level frequency converter is divided into 12 sectors；
Determine sector belonging to the current output voltage vector of three-phase tri-level frequency converter；
According to the symbol and each phase current of the upside capacitance voltage of three-phase tri-level frequency converter topology and downside capacitance voltage difference
Direction, determine can be achieved balance control DC side mid-point voltage current sector needed for space voltage vector；
In space voltage vector needed for from current sector, selecting makes the smallest space voltage vector of cost function；Wherein, it is worth
Function be space voltage vector and current output voltage vector respectively in three-phase static coordinate system on α β axis the difference of component mould
Value；
Using the switch state for the space voltage vector control three-phase tri-level frequency converter selected, the frequency control control of motor is realized
System.
2. a kind of three-level Converter model predictive control method as described in claim 1, which is characterized in that with most
Big modulus value and the space voltage vector boundary for being only second to maximum modulus value, by the topologically corresponding space electricity of three-phase tri-level frequency converter
Pressure vector is divided into 12 sectors.
3. a kind of three-level Converter model predictive control method as described in claim 1, which is characterized in that utilize
VVVF method is constant to guarantee the every pole air-gap flux amount of motor, defeated to change by changing three-phase tri-level frequency converter output voltage
Electric voltage frequency out realizes the purpose of frequency control.
4. a kind of three-phase tri-level frequency conversion speed-adjusting system model predictive control method as claimed in claim 3, which is characterized in that
The precondition of VVVF method is: ignoring the pressure drop on motor stator resistance and stator leakage reactance.
5. a kind of controller is connected with three-phase tri-level frequency converter, three-phase tri-level frequency converter is connected to the motor；Its feature exists
In the controller, comprising:
Sector division module is used to for the topologically corresponding space voltage vector of three-phase tri-level frequency converter to be divided into 12 fans
Area；
Sector determining module is used to determine sector belonging to the current output voltage vector of three-phase tri-level frequency converter；
Space voltage vector determining module needed for sector is used for the upside capacitance voltage according to three-phase tri-level frequency converter topology
With the symbol of downside capacitance voltage difference and the direction of each phase current, determines and working as balance control DC side mid-point voltage can be achieved
Space voltage vector needed for preceding sector；
Space voltage vector screening module is used for from space voltage vector needed for current sector, and selecting makes cost function
The smallest space voltage vector；Wherein, cost function is that space voltage vector and current output voltage vector are quiet in three-phase respectively
Only in coordinate system on α β axis the difference of component modulus value；
Variable frequency regulating speed control module is used for the switch shape using the space voltage vector control three-phase tri-level frequency converter selected
State realizes the variable frequency regulating speed control of motor.
6. a kind of controller as claimed in claim 5, which is characterized in that in the sector division module, with maximum modulus value
And it is only second to the space voltage vector boundary of maximum modulus value, by the topologically corresponding space voltage vector of three-phase tri-level frequency converter
It is divided into 12 sectors.
7. a kind of controller as claimed in claim 5, which is characterized in that in the variable frequency regulating speed control module, utilize
VVVF method is constant to guarantee the every pole air-gap flux amount of motor, defeated to change by changing three-phase tri-level frequency converter output voltage
Electric voltage frequency out realizes the purpose of frequency control.
8. a kind of controller as claimed in claim 7, which is characterized in that in the variable frequency regulating speed control module, the side VVVF
The precondition of method is: ignoring the pressure drop on motor stator resistance and stator leakage reactance.
9. a kind of three-level Converter, which is characterized in that including the control as described in any one of claim 5-8
Device.
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| CN114244169A (en) * | 2021-12-16 | 2022-03-25 | 山东大学 | Fractional order-based multi-index cooperative control method and system for three-level inverter |
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| 秦昌伟: "中点箝位型三电平逆变器优化PWM方法的研究", 《中国优秀硕士学位论文全文数据库工程科技II辑》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110707978A (en) * | 2019-10-12 | 2020-01-17 | 南通大学 | Three-level permanent magnet synchronous motor model prediction control method considering vector partition |
| CN110707978B (en) * | 2019-10-12 | 2021-06-11 | 南通大学 | Three-level permanent magnet synchronous motor model prediction control method considering vector partition |
| CN114244169A (en) * | 2021-12-16 | 2022-03-25 | 山东大学 | Fractional order-based multi-index cooperative control method and system for three-level inverter |
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