CN107040181A - The Direct Torque Control and device of a kind of three-level current transformer - Google Patents
The Direct Torque Control and device of a kind of three-level current transformer Download PDFInfo
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- CN107040181A CN107040181A CN201710150121.8A CN201710150121A CN107040181A CN 107040181 A CN107040181 A CN 107040181A CN 201710150121 A CN201710150121 A CN 201710150121A CN 107040181 A CN107040181 A CN 107040181A
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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
- H02P21/14—Estimation or adaptation of machine parameters, e.g. flux, current or voltage
- H02P21/141—Flux estimation
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Abstract
Include the invention discloses a kind of Direct Torque Control of three-level current transformer with device：The two-phase target voltage vector of output is determined using PI torque controllers and target voltage vector calculation unit；Two-phase target voltage vector is converted into three-phase reference voltage vector；Determine the sector where three-phase reference voltage vector；The small vector that neutral-point potential balance is advantageously selected in the sector where three-phase reference voltage vector participates in synthesis target reference voltage vector.The present invention can accurately calculate vector time, fast dynamic response, reduce switching loss and torque ripple.
Description
Technical field
The present invention relates to field of electromechanical technology, especially, it is related to a kind of Direct Torque Control of three-level current transformer
With device.
Background technology
Three level NPC (three-level neutral point clamped) are topological since proposition, just in mesohigh
The multiple fields such as AC Drive, flexible transmission, electric network reactive compensation and absorption are widely used.Midpoint potential is uneven
It is the intrinsic problem of Diode-clamped Three-level Inverter, output voltage and electric current can be significantly increased in the imbalance of midpoint potential
Harmonic wave, causes switching tube to meet with stresses change greatly, or even cause load motor torque oscillation on large scale.Especially in Motor Control Field,
Direct Torque Control based on three-level current transformer is the hot issue of research all the time.
Traditional neutral-point potential balance method distributed according to the direction of unbalance of neutral-point voltage and load current small vector and
The action time of middle vector balances midpoint potential.According to mid-point potential offset direction, the action time to small vector is adjusted to,
Increase is conducive to the small vector action time of neutral-point potential balance, when reducing the small vector effect for being unfavorable for neutral-point potential balance
Between, balance the skew of midpoint potential.But it is unequal that this kind of method does not account for paired small vector amplitude during mid-point potential offset,
Calculating to vector time is inaccurate.And due to using paired two small vectors, dynamic response can be caused slower, switching loss
Greatly.
Three traditional level Direct Torque Controls are that most suitable voltage vector is selected by torque and the stagnant ring of magnetic linkage, are held
Torque ripple is easily caused, is also caused within the fixed sampling period, switching frequency is non-constant, it is impossible to make full use of power device
Capacity, produces the harmonic wave of different orders.Simultaneously because meeting the voltage vector of torque and magnetic linkage, three-level current transformer may be made
Mid-point potential offset, causes torque to be shaken.
For Direct Torque Control in the prior art is inaccurate to the calculating of vector time, dynamic response is relatively slow, open
The problem of closing big loss, torque ripple, not yet there is effective solution at present.
The content of the invention
In view of this, it is an object of the invention to propose the Direct Torque Control and dress of a kind of three-level current transformer
Put, can accurately calculate vector time, fast dynamic response, reduce switching loss and torque ripple.
Based on above-mentioned purpose, the technical scheme that the present invention is provided is as follows：
According to an aspect of the invention, there is provided a kind of Direct Torque Control of three-level current transformer, including：
The two-phase target voltage vector of output is determined using PI torque controllers and target voltage vector calculation unit；
Two-phase target voltage vector is converted into three-phase reference voltage vector；
Determine the sector where three-phase reference voltage vector；
The small vector that neutral-point potential balance is advantageously selected in the sector where three-phase reference voltage vector participates in synthesis
Target reference voltage vector.
In some embodiments, the use PI torque controllers determine output with target voltage vector calculation unit
Two-phase target voltage vector includes：
Magnetic linkage is observed, estimation stator magnetic linkage vector is obtained；
Obtained according to magnetic linkage and PI torque controllers and refer to stator magnetic linkage vector；
Stator magnetic linkage deviation is obtained according to reference to stator magnetic linkage vector and estimation stator magnetic linkage vector；
Electromagnetic torque is determined according to stator magnetic linkage angle of torsion；
Two-phase target voltage vector is determined according to stator magnetic linkage deviation and electromagnetic torque.
In some embodiments, it is described by two-phase target voltage vector be converted into according to three-phase reference voltage vector with
Lower corresponding relation is converted：
Wherein, the two-phase target voltage vector is respectively Uα、Uβ, the three-phase reference voltage vector is respectively Ua、Ub、
Uc。
In some embodiments, the sector where the determination three-phase reference voltage vector includes：
Big sector according to where the deflection of the three-phase reference voltage vector determines the three-phase reference voltage vector
With the deflection angle of big sector where the three-phase reference voltage vector；
Big sector according to where the three-phase reference voltage vector and big sector where the three-phase reference voltage vector
Deflection angle determine small sector where the three-phase reference voltage vector.
In some embodiments, it is advantageously selected for midpoint potential in the sector where three-phase reference voltage vector
The small vector of balance, which participates in synthesis target reference voltage vector, to be included：
Determine midpoint potential degree of unbalancedness and modulation degree；
Virtual Space vector is determined according to the average value of middle vector and two adjacent small vectors；
Determine that midpoint potential degree of unbalancedness determines each vector action time with modulation degree；
Target reference voltage vector is synthesized with each vector action time according to Virtual Space vector.
According to another aspect of the present invention there is provided a kind of Direct Torque Control device of three-level current transformer, including：
Computing module, the two-phase target for determining output according to PI torque controllers and target voltage vector calculation unit
Voltage vector；
Conversion module, for two-phase target voltage vector to be converted into three-phase reference voltage vector；
Locating module, for determining the sector where three-phase reference voltage vector；
Synthesis module, for being advantageously selected for the small of neutral-point potential balance in the sector where three-phase reference voltage vector
Vector participates in synthesis target reference voltage vector.
In some embodiments, the job step of the computing module includes：
Magnetic linkage is observed, estimation stator magnetic linkage vector is obtained；
Obtained according to magnetic linkage and PI torque controllers and refer to stator magnetic linkage vector；
Stator magnetic linkage deviation is obtained according to reference to stator magnetic linkage vector and estimation stator magnetic linkage vector；
Electromagnetic torque is determined according to stator magnetic linkage angle of torsion；
Two-phase target voltage vector is determined according to stator magnetic linkage deviation and electromagnetic torque.
In some embodiments, the work of the conversion module is that three-phase reference voltage vector is to be closed according to following correspondence
It is to be converted：
Wherein, the two-phase target voltage vector is respectively Uα、Uβ, the three-phase reference voltage vector is respectively Ua、Ub、
Uc。
In some embodiments, the job step of the locating module includes：
Big sector according to where the deflection of the three-phase reference voltage vector determines the three-phase reference voltage vector
With the deflection angle of big sector where the three-phase reference voltage vector；
Big sector according to where the three-phase reference voltage vector and big sector where the three-phase reference voltage vector
Deflection angle determine small sector where the three-phase reference voltage vector.
In some embodiments, the job step of the synthesis module includes：
Determine midpoint potential degree of unbalancedness and modulation degree；
Virtual Space vector is determined according to the average value of middle vector and two adjacent small vectors；
Determine that midpoint potential degree of unbalancedness determines each vector action time with modulation degree；
Target reference voltage vector is synthesized with each vector action time according to Virtual Space vector.
From the above it can be seen that the technical scheme that the present invention is provided is by using PI torque controllers and target voltage
Vector calculation unit determines that the two-phase target voltage vector of output is converted into three-phase reference voltage vector, it is determined that the sector at place is simultaneously
The small vector for being advantageously selected for neutral-point potential balance participates in the technological means of synthesis target reference voltage vector, can accurately calculate
Vector time, fast dynamic response, reduction switching loss and torque ripple.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to institute in embodiment
The accompanying drawing needed to use is briefly described, it should be apparent that, drawings in the following description are only some implementations of the present invention
Example, for those of ordinary skill in the art, on the premise of not paying creative work, can also be obtained according to these accompanying drawings
Obtain other accompanying drawings.
Fig. 1 is a kind of flow chart of the Direct Torque Control of three-level current transformer according to the embodiment of the present invention；
Fig. 2 is in the Direct Torque Control according to a kind of three-level current transformer of the embodiment of the present invention, SVM-DTC is former
Manage structured flowchart；
Fig. 3 is a kind of one embodiment of the Direct Torque Control of three-level current transformer according to the embodiment of the present invention
In three dimensional vector diagram；
Fig. 4 is a kind of one embodiment of the Direct Torque Control of three-level current transformer according to the embodiment of the present invention
In A sectors Vector modulation graph of a relation；
Fig. 5 is a kind of structured flowchart of the Direct Torque Control device of three-level current transformer according to the embodiment of the present invention；
Fig. 6 is a kind of electronic equipment of the Direct Torque Control of three-level current transformer according to the embodiment of the present invention
The hardware structure diagram of one embodiment.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, below in conjunction with the embodiment of the present invention
Accompanying drawing, the technical scheme in the embodiment of the present invention is further carried out it is clear, complete, describe in detail, it is clear that it is described
Embodiment is only a part of embodiment of the invention, rather than whole embodiments.Based on the embodiment in the present invention, this area
The every other embodiment that those of ordinary skill is obtained, belongs to the scope of protection of the invention.
Based on above-mentioned purpose, directly turning there is provided a kind of three-level current transformer according to first embodiment of the invention
Square control method.
As shown in figure 1, the Direct Torque Control of the three-level current transformer provided according to embodiments of the present invention includes：
Step S101, the two-phase target voltage of output is determined using PI torque controllers and target voltage vector calculation unit
Vector；
Step S103, three-phase reference voltage vector is converted into by two-phase target voltage vector；
Step S105, determines the sector where three-phase reference voltage vector；
Step S107, is advantageously selected for the small vector of neutral-point potential balance in the sector where three-phase reference voltage vector
Participate in synthesis target reference voltage vector.
In some embodiments, the use PI torque controllers determine output with target voltage vector calculation unit
Two-phase target voltage vector includes：
Magnetic linkage is observed, estimation stator magnetic linkage vector is obtained；
Obtained according to magnetic linkage and PI torque controllers and refer to stator magnetic linkage vector；
Stator magnetic linkage deviation is obtained according to reference to stator magnetic linkage vector and estimation stator magnetic linkage vector；
Electromagnetic torque is determined according to stator magnetic linkage angle of torsion；
Two-phase target voltage vector is determined according to stator magnetic linkage deviation and electromagnetic torque.
In some embodiments, it is described by two-phase target voltage vector be converted into according to three-phase reference voltage vector with
Lower corresponding relation is converted：
Wherein, the two-phase target voltage vector is respectively Uα、Uβ, the three-phase reference voltage vector is respectively Ua、Ub、
Uc。
In some embodiments, the sector where the determination three-phase reference voltage vector includes：
Big sector according to where the deflection of the three-phase reference voltage vector determines the three-phase reference voltage vector
With the deflection angle of big sector where the three-phase reference voltage vector；
Big sector according to where the three-phase reference voltage vector and big sector where the three-phase reference voltage vector
Deflection angle determine small sector where the three-phase reference voltage vector.
In some embodiments, it is advantageously selected for midpoint potential in the sector where three-phase reference voltage vector
The small vector of balance, which participates in synthesis target reference voltage vector, to be included：
Determine midpoint potential degree of unbalancedness and modulation degree；
Virtual Space vector is determined according to the average value of middle vector and two adjacent small vectors；
Determine that midpoint potential degree of unbalancedness determines each vector action time with modulation degree；
Target reference voltage vector is synthesized with each vector action time according to Virtual Space vector.
In summary, by means of the technical solution of the present invention, sweared by using PI torque controllers and target voltage
Amount computing unit determines that the two-phase target voltage vector of output is converted into three-phase reference voltage vector, it is determined that sector and the choosing at place
The technological means for being conducive to the small vector of neutral-point potential balance to participate in synthesis target reference voltage vector is selected, arrow can be accurately calculated
Amount time, fast dynamic response, reduction switching loss and torque ripple.
Based on above-mentioned purpose, according to a kind of second embodiment directly turning there is provided three-level current transformer of the present invention
One embodiment of square control method.
Under α β rest frames, stator magnetic linkage ψsWith the u of stator voltagesRelation is：
Stator magnetic linkage amplitude
Stator magnetic linkage Angle Position
θ=arctan (ψsβ/ψsα) (3)
Motor torque equation
ψ in formulasα、ψsβ、usα、usβ、isα、isβRespectively stator magnetic linkage vector, stator voltage vector, stator current vector exist
Component on α, β, TeFor electromagnetic torque, LσFor leakage inductance, nPFor number of pole-pairs, ψrFor rotor flux, RsFor stator resistance, θ is rotor
Magnetic linkage and stator magnetic linkage angle, i.e. angle of torsion.
From (4) formula, when keeping stator and rotor magnetic linkage constant amplitude, electromagnetic torque can be changed by changing angle of torsion.
The three level Direct Torque Controls that the embodiment of the present invention is proposed utilize PI torque controllers, target voltage Vector operation
Unit instead of magnetic linkage, torque hysteresis comparator and the voltage vector switch list in traditional DTC controls.It can be estimated by flux observation
Magnetic linkage current location is calculated, the output of combined torque PI controllers can be calculated with reference to stator magnetic linkage vector.
Stator magnetic linkage deviation is obtained with reference to the stator magnetic linkage vector that stator magnetic linkage vector is estimated.
Target output voltage vector is can determine that with reference to (1), (5) and (6).
SVM can reduce the harmonic wave in output current, improve DC bus-bar voltage utilization rate, while ensureing opening for power device
Frequency-invariant is closed, the smooth control of magnetic linkage and torque is realized, so as to reduce magnetic linkage, torque pulsation.SVM-DTC theory structure block diagrams
As shown in Figure 2.
The target output voltage vector is synthesized by space vector modulating method by several basic switch voltage vectors, synthesis
During to consider the equilibrium problem of three-level current transformer midpoint potential.
Again subregion is carried out to 3 level space vector, one big sector is bisected into three small sectors.In view of midpoint
The change of small vector amplitude during potential shift, introduces midpoint potential degree of unbalancedness, according to mid-point potential offset direction and phase current
Direction, be advantageously selected for balancing the small vector of midpoint potential, accurate to calculate vector action time, reasonable arrangement vector sequence,
Realize the accurate control of alignment current potential.
Calculating reference voltage vector amplitude and the method for phase angle are specially the method for the phase inversion of three-phase-two, its calculation formula
For：
The amplitude U of reference voltage vector can be calculated according to above-mentioned formularefWith phase angle u.
The determination methods of big sector are where reference voltage vector：
If 0≤u<π/3, stator magnetic linkage is located at A sectors, makes S=A, n=1；
If π/3≤u<During 2 π/3, stator magnetic linkage is located at B sectors, makes S=B, n=2；
If 2 π/3≤u<During π, stator magnetic linkage is located at C sectors, makes S=C, n=3；
If π≤u<During 4 π/3, stator magnetic linkage is located at D sectors, makes S=D, n=4；
If 4 π/3≤u<During 5 π/3, stator magnetic linkage is located at E sectors, makes S=E, n=5；
If 5 π/3≤u<During 2 π, stator magnetic linkage is located at F sectors, makes S=F, n=6.
The determination methods of small sector are where reference voltage vector：
When reference voltage vector is located at S (S=A, B, C, D, E, F) sector, θ=u- (n-1) π/3 are made.
IfOrReference voltage vector is located at S1 sectors；
IfOrReference voltage vector is located at S2 sectors；
Otherwise, reference voltage vector is located at S3 sectors.
The determination methods for being advantageously selected for the small vector of neutral-point potential balance are：
When considering that midpoint potential is uneven, paired small vector amplitude size is simultaneously unequal, introduces midpoint potential degree of unbalancedness k
=1-2UC2/UDC.K characterizes mid-point potential offset degree, and k is that 0 expression midpoint potential does not shift, and k absolute value is bigger, table
Show that mid-point potential offset is more serious.Modulation degree isLinear modulation interval is 0<m<1.In considering
Point potential shift, it should be noted that paired small vector size is simultaneously unequal.Sector A is divided into three small fan by border of angular bisector
Area, introduces Virtual Space vector
Zero vector and the corresponding working condition of big vector are not connected with midpoint, and alignment current potential is without influence；Swear Virtual Space
The electric current that amount flows into midpoint is zero, then the introducing alignment current potential of Virtual Space vector is also without influence.Therefore, according to midpoint potential
The direction and phase current direction of skew are conducive to the small vector of neutral-point potential balance to choose, so that it may realize the control of alignment current potential
System.Due to being only chosen to that synthesized reference vector is participated in a small vector in small vector, rather than use paired two vectors
Synthesized reference vector, so that faster, on-off times are less for the speed of improvement mid-point potential offset.
Fig. 3 is illustrated that three dimensional vector diagram in the present embodiment.As shown in figure 3, three dimensional vector diagram is by zero vector, small arrow
Amount, the middle big vector composition of vector, is divided into this six sectors of ABCDEF.Consider that midpoint potential is uneven, mid-point potential offset compared with
When big, such as series capacitance both sides voltage ratio is UC1/UC2When=3/7, paired small vector size is simultaneously unequal, it is therefore necessary to
Consider the unequal influence synthesized to reference vector of paired small vector size.
Fig. 4 is illustrated that the Vector modulation graph of a relation of A sectors in the present embodiment.As shown in figure 4, A sectors be divided into it is three small
Sector, reference vector Uref=Uref(cosθ+jsinθ).The embodiment of the present invention makes controlling cycle TS=1 is the unit time, is fanned with A
Analyzed exemplified by area.
As reference voltage vector UrefDuring positioned at A1 sectors, voltage vector U0、U3WithDo not influence midpoint potential.U1NIn
Point electric current is ia, U1PMidpoint electric current be-ia, U1NAnd U1PThe effect of alignment current potential is opposite.By judging k and iaSymbol,
It is advantageously selected for balancing the small vector synthesized reference vector of midpoint potential, a point situation is discussed：
(1)kia<0, use U0、U1NWithSynthesized reference voltage vector, now reference vector compositive relation be：
t2+t1+t0=1
Each vector action time can be obtained：
t2=3msin θ
t0=1-t1-t2
If t0<0, then show because modulation degree is larger, reference voltage vector UrefU can not be used0Synthesis is participated in, U is used3Instead of U0
Participate in synthesized reference voltage vector Uref.Now reference vector compositive relation is：
t2+t1+t3=1
Each vector action time can be obtained：
t2=3msin θ
t3=1-t1-t2
(2)kia>0, use U0、U1pWithSynthesized reference voltage vector, now reference vector compositive relation be
t2+t1+t0=1
Each vector action time can be obtained：
t2=3msin θ
t0=1-t1-t2
If t0<0, then show because modulation degree is larger, reference voltage vector UrefU can not be used0Synthesis is participated in, U is now used3Generation
For U0Participate in synthesized reference voltage vector Uref.Now reference vector compositive relation is：
t2+t1+t3=1
Each vector action time can be obtained：
t2=3msin θ
t3=1-t1-t2
Corresponding voltage vector sequence is exported, target reference voltage vector is synthesized.
(2) reference vector is located at A2 sectors
As reference voltage vector UrefDuring positioned at A2 sectors, situation is similar with A1 sectors, voltage vector U0、U5WithNot shadow
Ring midpoint potential.U4NMidpoint electric current be ic, U4PMidpoint electric current be-ic, U4NAnd U4PThe effect of alignment current potential is opposite.Root
According to kicSymbol be advantageously selected for the small vector (U of neutral-point potential balance4NOr U4P) participate in reference voltage vector synthesis.
(3) reference vector is located at A3 sectors
As reference voltage vector UrefDuring positioned at A3 sectors, due to U3、U5WithEffect do not influence mid-point voltage, refer to
The synthesis of vector does not influence mid-point voltage.Now reference vector compositive relation is：
t2+t5+t3=1
Each vector action time can be obtained：
t2=3-3msin (π/3+ θ)
Corresponding voltage vector sequence is exported, target reference voltage vector is synthesized.
In summary, by means of the technical solution of the present invention, sweared by using PI torque controllers and target voltage
Amount computing unit determines that the two-phase target voltage vector of output is converted into three-phase reference voltage vector, it is determined that sector and the choosing at place
The technological means for being conducive to the small vector of neutral-point potential balance to participate in synthesis target reference voltage vector is selected, arrow can be accurately calculated
Amount time, fast dynamic response, reduction switching loss and torque ripple.
Based on above-mentioned purpose, according to a kind of the 3rd embodiment directly the turning there is provided three-level current transformer of the present invention
Square control device.
As shown in figure 5, the Direct Torque Control device of the three-level current transformer provided according to embodiments of the present invention includes：
Computing module 51, the two-phase mesh for determining output according to PI torque controllers and target voltage vector calculation unit
Mark voltage vector；
Conversion module 52, for two-phase target voltage vector to be converted into three-phase reference voltage vector；
Locating module 53, for determining the sector where three-phase reference voltage vector；
Synthesis module 54, for being advantageously selected for neutral-point potential balance in the sector where three-phase reference voltage vector
Small vector participates in synthesis target reference voltage vector.
In some embodiments, the job step of the computing module 51 includes：
Magnetic linkage is observed, estimation stator magnetic linkage vector is obtained；
Obtained according to magnetic linkage and PI torque controllers and refer to stator magnetic linkage vector；
Stator magnetic linkage deviation is obtained according to reference to stator magnetic linkage vector and estimation stator magnetic linkage vector；
Electromagnetic torque is determined according to stator magnetic linkage angle of torsion；
Two-phase target voltage vector is determined according to stator magnetic linkage deviation and electromagnetic torque.
In some embodiments, the work of the conversion module 52 is that three-phase reference voltage vector is according to following correspondence
Relation is converted：
Wherein, the two-phase target voltage vector is respectively Uα、Uβ, the three-phase reference voltage vector is respectively Ua、Ub、
Uc。
In some embodiments, the job step of the locating module 53 includes：
Big sector according to where the deflection of the three-phase reference voltage vector determines the three-phase reference voltage vector
With the deflection angle of big sector where the three-phase reference voltage vector；
Big sector according to where the three-phase reference voltage vector and big sector where the three-phase reference voltage vector
Deflection angle determine small sector where the three-phase reference voltage vector.
In some embodiments, the job step of the synthesis module 54 includes：
Determine midpoint potential degree of unbalancedness and modulation degree；
Virtual Space vector is determined according to the average value of middle vector and two adjacent small vectors；
Determine that midpoint potential degree of unbalancedness determines each vector action time with modulation degree；
Target reference voltage vector is synthesized with each vector action time according to Virtual Space vector.
In summary, by means of the technical solution of the present invention, sweared by using PI torque controllers and target voltage
Amount computing unit determines that the two-phase target voltage vector of output is converted into three-phase reference voltage vector, it is determined that sector and the choosing at place
The technological means for being conducive to the small vector of neutral-point potential balance to participate in synthesis target reference voltage vector is selected, arrow can be accurately calculated
Amount time, fast dynamic response, reduction switching loss and torque ripple.
Based on above-mentioned purpose, the three-level current transformer is performed there is provided one kind according to the 4th embodiment of the present invention
Direct Torque Control electronic equipment one embodiment.
The electronic equipment of the Direct Torque Control for performing the three-level current transformer is handled including at least one
Device；And the memory being connected with least one described processor communication；Wherein, the memory storage have can by it is described at least
The instruction of one computing device, the instruction is by least one described computing device, so that at least one described processor
It is able to carry out any one method as described above.
As shown in fig. 6, the electronic equipment for performing the method for speech processing in the real time phone call provided for the present invention
The hardware architecture diagram of one embodiment.
By taking electronic equipment as shown in Figure 6 as an example, include a processor 601 and a storage in the electronic equipment
Device 602, and can also include：Input unit 603 and output device 604.
Processor 601, memory 602, input unit 603 and output device 604 can pass through bus or other modes
In connection, Fig. 6 exemplified by being connected by bus.
Memory 602 is as a kind of non-volatile computer readable storage medium storing program for executing, available for storage non-volatile software journey
The three-level current transformer in sequence, non-volatile computer executable program and module, such as the embodiment of the present application it is direct
Corresponding programmed instruction/the module of method for controlling torque.Processor 601 is by running storage in the memory 602 non-volatile
Software program, instruction and module, so that various function application and the data processing of execute server, that is, realize the above method
The Direct Torque Control of the three-level current transformer of embodiment.
Memory 602 can include storing program area and storage data field, wherein, storing program area can store operation system
Application program required for system, at least one function；Storage data field can store the Direct torque according to three-level current transformer
Device processed uses created data etc..In addition, memory 602 can include high-speed random access memory, it can also wrap
Include nonvolatile memory, for example, at least one disk memory, flush memory device or other non-volatile solid state memories
Part.In certain embodiments, memory 602 is optional including the memory remotely located relative to processor 601.Above-mentioned network
Example includes but is not limited to internet, intranet, LAN, mobile radio communication and combinations thereof.
Input unit 603 can receive the numeral or character information of input, and produce and directly to turn with three-level current transformer
The key signals input that the user of square control device is set and function control is relevant.Output device 604 may include that display screen etc. shows
Show equipment.
One or more of modules are stored in the memory 602, when being performed by the processor 601, are held
The Direct Torque Control of three-level current transformer in the above-mentioned any means embodiment of row.
Any one embodiment of the electronic equipment of the Direct Torque Control for performing the three-level current transformer,
The identical or similar effect of corresponding foregoing any means embodiment can be reached.
One of ordinary skill in the art will appreciate that realize all or part of flow in above-described embodiment method, being can be with
Related hardware is instructed to complete by computer program, described program can be stored in a computer read/write memory medium
In, the program is upon execution, it may include such as the flow of the embodiment of above-mentioned each method.Wherein, described storage medium can be magnetic
Dish, CD, read-only memory (Read-OnlyMemory, ROM) or random access memory (Random Access
Memory, RAM) etc..The embodiment of the computer program, can reach that corresponding foregoing any means embodiment is identical
Or similar effect.
In addition, typically, device, equipment described in the disclosure etc. can be various electric terminal equipments, such as mobile phone, individual
Digital assistants (PDA), tablet personal computer (PAD), intelligent television etc. or large-scale terminal device, such as server, therefore this
Disclosed protection domain should not limit as certain certain types of device, equipment.Client described in the disclosure can be with electricity
The combining form of sub- hardware, computer software or both is applied in any one above-mentioned electric terminal equipment.
In addition, the computer program for being also implemented as being performed by CPU according to disclosed method, the computer program
It can store in a computer-readable storage medium.When the computer program is performed by CPU, perform in disclosed method and limit
Fixed above-mentioned functions.
In addition, above method step and system unit can also utilize controller and cause controller real for storing
The computer-readable recording medium of the computer program of existing above-mentioned steps or Elementary Function is realized.
In addition, it should be appreciated that computer-readable recording medium (for example, memory) of the present invention can be easy
The property lost memory or nonvolatile memory, or both volatile memory and nonvolatile memory can be included.As
Example and it is nonrestrictive, nonvolatile memory, which can include read-only storage (ROM), programming ROM (PROM), electricity, to be compiled
Journey ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory.Volatile memory can include depositing at random
Access to memory (RAM), the RAM can serve as external cache.Nonrestrictive as an example, RAM can be with
Diversified forms are obtained, such as synchronous random access memory (DRAM), dynamic ram (DRAM), synchronous dram (SDRAM), double data rate SDRAM
(DDR SDRAM), enhancing SDRAM (ESDRAM), synchronization link DRAM (SLDRAM) and directly RambusRAM (DRRAM).Institute
The storage device of disclosed aspect is intended to the memory of including but not limited to these and other suitable type.
Those skilled in the art will also understand is that, the various illustrative logical blocks with reference to described by disclosure herein, mould
Block, circuit and algorithm steps may be implemented as the combination of electronic hardware, computer software or both.It is hard in order to clearly demonstrate
This interchangeability of part and software, the function with regard to various exemplary components, square, module, circuit and step it is entered
General description is gone.This function is implemented as software and is also implemented as hardware depending on concrete application and application
Design constraint to whole system.Those skilled in the art can in a variety of ways realize described for every kind of concrete application
Function, but this realize that decision should not be interpreted as causing a departure from the scope of the present disclosure.
Various illustrative logical blocks, module and circuit with reference to described by disclosure herein, which can be utilized, to be designed to
The following part of function described here is performed to realize or perform：General processor, digital signal processor (DSP), special collection
Into circuit (ASIC), field programmable gate array (FPGA) or other PLDs, discrete gate or transistor logic, divide
Any combinations of vertical nextport hardware component NextPort or these parts.General processor can be microprocessor, but alternatively, processing
Device can be any conventional processors, controller, microcontroller or state machine.Processor can also be implemented as computing device
Combination, for example, the combination of DSP and microprocessor, multi-microprocessor, one or more microprocessors combination DSP core or any
Other this configurations.
The step of method with reference to described by disclosure herein or algorithm, can be directly contained in hardware, be held by processor
In capable software module or in combination of the two.Software module may reside within RAM memory, flash memory, ROM storages
Device, eprom memory, eeprom memory, register, hard disk, removable disk, CD-ROM or known in the art it is any its
In the storage medium of its form.Exemplary storage medium is coupled to processor so that processor can be from the storage medium
Middle reading information writes information to the storage medium.In an alternative, the storage medium can be with processor collection
Into together.Processor and storage medium may reside within ASIC.ASIC may reside within user terminal.In a replacement
In scheme, processor and storage medium can be resident in the user terminal as discrete assembly.
In one or more exemplary designs, the function can be real in hardware, software, firmware or its any combination
It is existing.If realized in software, the function can be stored in as one or more instructions or code computer-readable
Transmitted on medium or by computer-readable medium.Computer-readable medium includes computer-readable storage medium and communication media,
The communication media includes helping to be sent to computer program into any medium of another position from a position.Storage medium
It can be any usable medium that can be accessed by a general purpose or special purpose computer.It is nonrestrictive as an example, the computer
Computer-readable recording medium can include RAM, ROM, EEPROM, CD-ROM or other optical disc memory apparatus, disk storage equipment or other magnetic
Property storage device, or can be used for carrying or storage form for instruct or data structure needed for program code and can
Any other medium accessed by universal or special computer or universal or special processor.In addition, any connection can
It is properly termed as computer-readable medium.If for example, using coaxial cable, optical fiber cable, twisted-pair feeder, digital subscriber line
(DSL) or such as infrared ray, radio and microwave wireless technology come from website, server or other remote sources send software,
Then the wireless technology of above-mentioned coaxial cable, optical fiber cable, twisted-pair feeder, DSL or such as infrared elder generations, radio and microwave is included in
The definition of medium.As used herein, disk and CD include compact disk (CD), laser disk, CD, digital versatile disc
(DVD), floppy disk, Blu-ray disc, wherein disk generally magnetically reproduce data, and CD utilizes laser optics ground reproduce data.On
The combination for stating content should also be as being included in the range of computer-readable medium.
Disclosed exemplary embodiment, but disclosed exemplary embodiment should be noted, it should be noted that without departing substantially from
On the premise of the scope of the present disclosure that claim is limited, it may be many modifications and change.According to disclosure described herein
Function, step and/or the action of the claim to a method of embodiment are not required to perform with any particular order.Although in addition, this public affairs
The element opened can be described or required in individual form, it is also contemplated that it is multiple, it is unless explicitly limited odd number.
It should be appreciated that use in the present invention, unless context clearly supports exception, singulative
" one " (" a ", " an ", " the ") is intended to also include plural form.It is to be further understood that use in the present invention " and/
Or " refer to include any of one or more than one project listed in association and be possible to combine.
Above-mentioned embodiment of the present disclosure sequence number is for illustration only, and the quality of embodiment is not represented.
One of ordinary skill in the art will appreciate that realizing that all or part of step of above-described embodiment can be by hardware
To complete, the hardware of correlation can also be instructed to complete by program, described program can be stored in a kind of computer-readable
In storage medium, storage medium mentioned above can be read-only storage, disk or CD etc..
Claims (10)
1. a kind of Direct Torque Control of three-level current transformer, it is characterised in that including：
The two-phase target voltage vector of output is determined using PI torque controllers and target voltage vector calculation unit；
Two-phase target voltage vector is converted into three-phase reference voltage vector；
Determine the sector where three-phase reference voltage vector；
The small vector that neutral-point potential balance is advantageously selected in the sector where three-phase reference voltage vector participates in synthesis target
Reference voltage vector.
2. according to the method described in claim 1, it is characterised in that the use PI torque controllers and target voltage vector meter
Calculate unit and determine that the two-phase target voltage vector of output includes：
Magnetic linkage is observed, estimation stator magnetic linkage vector is obtained；
Obtained according to magnetic linkage and PI torque controllers and refer to stator magnetic linkage vector；
Stator magnetic linkage deviation is obtained according to reference to stator magnetic linkage vector and estimation stator magnetic linkage vector；
Electromagnetic torque is determined according to stator magnetic linkage angle of torsion；
Two-phase target voltage vector is determined according to stator magnetic linkage deviation and electromagnetic torque.
3. according to the method described in claim 1, it is characterised in that described that two-phase target voltage vector is converted into three-phase reference
Voltage vector is to be converted according to following corresponding relation：
Wherein, the two-phase target voltage vector is respectively Uα、Uβ, the three-phase reference voltage vector is respectively Ua、Ub、Uc。
4. method according to claim 3, it is characterised in that the sector bag where the determination three-phase reference voltage vector
Include：
Big sector and institute according to where the deflection of the three-phase reference voltage vector determines the three-phase reference voltage vector
The deflection angle of big sector where stating three-phase reference voltage vector；
Big sector according to where the three-phase reference voltage vector is inclined with big sector where the three-phase reference voltage vector
Corner determines the small sector where the three-phase reference voltage vector.
5. method according to claim 4, it is characterised in that selected in the sector where three-phase reference voltage vector
Select and be conducive to the small vector participation synthesis target reference voltage vector of neutral-point potential balance to include：
Determine midpoint potential degree of unbalancedness and modulation degree；
Virtual Space vector is determined according to the average value of middle vector and two adjacent small vectors；
Determine that midpoint potential degree of unbalancedness determines each vector action time with modulation degree；
Target reference voltage vector is synthesized with each vector action time according to Virtual Space vector.
6. a kind of Direct Torque Control device of three-level current transformer, it is characterised in that including：
Computing module, the two-phase target voltage for determining output according to PI torque controllers and target voltage vector calculation unit
Vector；
Conversion module, for two-phase target voltage vector to be converted into three-phase reference voltage vector；
Locating module, for determining the sector where three-phase reference voltage vector；
Synthesis module, the small vector for being advantageously selected for neutral-point potential balance in the sector where three-phase reference voltage vector
Participate in synthesis target reference voltage vector.
7. device according to claim 6, it is characterised in that the job step of the computing module includes：
Magnetic linkage is observed, estimation stator magnetic linkage vector is obtained；
Obtained according to magnetic linkage and PI torque controllers and refer to stator magnetic linkage vector；
Stator magnetic linkage deviation is obtained according to reference to stator magnetic linkage vector and estimation stator magnetic linkage vector；
Electromagnetic torque is determined according to stator magnetic linkage angle of torsion；
Two-phase target voltage vector is determined according to stator magnetic linkage deviation and electromagnetic torque.
8. device according to claim 6, it is characterised in that the work of the conversion module is three-phase reference voltage vector
To be converted according to following corresponding relation：
Wherein, the two-phase target voltage vector is respectively Uα、Uβ, the three-phase reference voltage vector is respectively Ua、Ub、Uc。
9. device according to claim 8, it is characterised in that the job step of the locating module includes：
Big sector and institute according to where the deflection of the three-phase reference voltage vector determines the three-phase reference voltage vector
The deflection angle of big sector where stating three-phase reference voltage vector；
Big sector according to where the three-phase reference voltage vector is inclined with big sector where the three-phase reference voltage vector
Corner determines the small sector where the three-phase reference voltage vector.
10. device according to claim 9, it is characterised in that the job step of the synthesis module includes：
Determine midpoint potential degree of unbalancedness and modulation degree；
Virtual Space vector is determined according to the average value of middle vector and two adjacent small vectors；
Determine that midpoint potential degree of unbalancedness determines each vector action time with modulation degree；
Target reference voltage vector is synthesized with each vector action time according to Virtual Space vector.
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