CN105099247B - The space vector width pulse modulation method of three level four bridge legs current transformers - Google Patents
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Abstract
The invention discloses a kind of space vector pulse width modulation strategy of three level four bridge legs current transformer, comprise the following steps：To the three-phase reference voltage v of three level four bridge legs current transformersaf、vbf、vcfCoordinate Conversion is carried out to obtain the coordinate (v under abc γ coordinate systemsa,vb,vc,vγ), big region and Delta Region according to residing for coordinate judges reference vector；Obtained according to big region and Delta Region and define planar function, and start vector is determined according to planar function is defined；Three-phase reference voltage is modified according to start vector to obtain three-phase reference voltage correction value；Linear operation is carried out to three-phase reference voltage correction value to obtain six intermediate variables, and the action time of any three intermediate variables calculating base vector in six intermediate variables；The switching device in three level four bridge legs current transformers is controlled according to action time.This method orderliness is clear, realizes simply, and high precision, real-time.
Description
Technical field
It is more particularly to a kind of based on reference the present invention relates to a kind of three level four bridge legs current transformer Space Vector Modulation Strategy
The space vector width pulse modulation method of three level four bridge legs current transformers of voltage decomposition.
Background technology
Three level four bridge legs current transformers are individually controlled by four bridge legs center line, and its control mode is flexible, and
Compensation out-of-balance current ability is stronger, especially in higher or higher to the compensation effect requirement occasion of voltage class, three level four
Bridge arm current transformer has more preferable compensation effect.Space vector pulse width modulation (SVPWM) is the conventional modulation of voltage source converter
Strategy, its DC voltage utilization rate is high, and output harmonic wave is few, it is easy to Digital Realization.
Because the threephase load of three level four bridge legs current transformers is uneven so that reference vector is distributed in three dimensions, because
This SVPWM for being applied to three level four bridge legs current transformers is D S VPWM (3D-SVPWM), also, due to three level four bridge legs
Main circuit of converter on off state is more, therefore SVPWM modulated process is complicated.
In correlation technique, the SVPWM of three level four bridge legs current transformers is carried out under α β γ coordinate systems, first determines whether reference
Delta Region of the vector on α β planes, then extends to space by plan-position, each triangular prism by six plane cuttings into
Seven tetrahedrons, the base vector of synthesized reference vector is determined finally according to tetrahedron where reference vector, and former by voltage-second balance
Reason calculates its action time.Due to being related to trigonometric function and radical sign computing, therefore influence computational accuracy in modulated process, and count
Calculation process is cumbersome, computationally intensive, and occupancy controller resource is more, influences the real-time of control.
The content of the invention
It is contemplated that at least solving one of technical problem in correlation technique to a certain extent.Therefore, the present invention
Purpose is to propose a kind of space vector width pulse modulation method of three level four bridge legs current transformer, can effectively solve the problem that Traditional Space
Vector Pulse Width Modulation policy calculation amount is big, and computational accuracy is low, the problem of poor real.
To achieve the above object, embodiments of the invention propose a kind of space vector arteries and veins of three level four bridge legs current transformer
Wide modulator approach, comprises the following steps：S1, to the three-phase reference voltage v of the three level four bridge legs current transformeraf、vbf、vcfEnter
Row Coordinate Conversion is to obtain the coordinate (v under abc γ coordinate systemsa,vb,vc,vγ), and according to the coordinate (va,vb,vc,vγ)
Coordinate components va、vb、vcJudge the big region and Delta Region residing for reference vector；S2 is big according to residing for the reference vector
Region and Delta Region, which are obtained, defines planar function, and determines start vector according to the planar function that defines；S3, according to described
Start vector is to the three-phase reference voltage vaf、vbf、vcfIt is modified, to obtain three-phase reference voltage correction value vaf′、vbf′、
vcf′；S4, to the three-phase reference voltage correction value vaf′、vbf′、vcf' carry out linear operation, with obtain six intermediate variable x,
Y, z, s, q, w, and any three intermediate variables calculating base vector V in described six intermediate variable x, y, z, s, q, w1、
V2、V3Action time t1、t2、t3；S5, according to the action time t1、t2、t3To in the three level four bridge legs current transformer
Switching device is controlled.
According to one embodiment of present invention, by below equation to the three-phase reference voltage vaf、vbf、vcfSat
Mark conversion：
Wherein, va、vb、vc、vγFor the coordinate (va,vb,vc,vγ) coordinate components, vaf、vbf、vcfFor three coherent
Examine voltage.
According to one embodiment of present invention, in step sl, according to the coordinate (va,vb,vc,vγ) coordinate components
va、vb、vcJudge the big region and Delta Region residing for reference vector, specifically include：According to the coordinate (va,vb,vc,vγ)
Coordinate components va、vb、vcJudge the big region residing for the reference vector with to the coordinate components va、vb、vcIt is modified；Root
According to revised coordinate components va′、vb′、vcDelta Region residing for the ' judgement reference vector.
Specifically, according to following table to the coordinate components va、vb、vcIt is modified to obtain the revised coordinate point
Measure va′、vb′、vc′：
| Big region | va′ | vb′ | vc′ |
| Ⅰ | va-Vdc/3 | vb+Vdc/6 | vc+Vdc/6 |
| Ⅱ | va-Vdc/6 | vb-Vdc/6 | vc+Vdc/3 |
| Ⅲ | va+Vdc/6 | vb-Vdc/3 | vc+Vdc/6 |
| Ⅳ | va+Vdc/3 | vb-Vdc/6 | vc-Vdc/6 |
| Ⅴ | va+Vdc/6 | vb+Vdc/6 | vc-Vdc/3 |
| Ⅵ | va-Vdc/6 | vb+Vdc/3 | vc-Vdc/6 |
Wherein, VdcFor the DC voltage of the three level four bridge legs current transformer.
According to one embodiment of present invention, it is described to define the relation that planar function meets following table：
Wherein, VdcFor the DC voltage of the three level four bridge legs current transformer.
According to one embodiment of present invention, the three-phase reference voltage v according to the relation pair of following tableaf、vbf、vcfCarry out
Correct to obtain the three-phase reference voltage correction value vaf′、vbf′、vcf′：
| Start vector | vaf′ | vbf′ | vcf′ |
| 1000 | vaf-Vdc/2 | vbf | vcf |
| 1001 | vaf | vbf+Vdc/2 | vcf+Vdc/2 |
| 1100 | vaf-Vdc/2 | vbf-Vdc/2 | vcf |
| 1101 | vaf | vbf | vcf+Vdc/2 |
| 0100 | vaf | vbf-Vdc/2 | vcf |
| 0101 | vaf+Vdc/2 | vbf | vcf+Vdc/2 |
| 0110 | vaf | vbf-Vdc/2 | vcf-Vdc/2 |
| 0111 | vaf+Vdc/2 | vbf | vcf |
| 0010 | vaf | vbf | vcf-Vdc/2 |
| 0011 | vaf+Vdc/2 | vbf+Vdc/2 | vcf |
| 1010 | vaf-Vdc/2 | vbf | vcf-Vdc/2 |
| 1011 | vaf | vbf+Vdc/2 | vcf |
Wherein, VdcFor the DC voltage of the three level four bridge legs current transformer.
According to one embodiment of present invention, by below equation to the three-phase reference voltage correction value vaf′、vbf′、
vcf' carry out linear operation：
Wherein, x, y, z, s, q, w are the intermediate variable, vaf′、vbf′、vcf' it is the three-phase reference voltage correction value.
Specifically, the action time t1、t2、t3Expressed by following formula：
Wherein, t1、t2、t3For the action time, x, y, z is the intermediate variable, TsFor switch periods, VdcTo be described
The DC voltage of three level four bridge legs current transformers.
Beneficial effect：Due to taking such scheme, defined according to Delta Region acquisition of the reference vector in abc planes flat
The planar function in face, and start vector is determined by planar function.Reference vector is decomposed by start vector, obtained after amendment
Three-phase reference voltage, and linear operation carried out to it ask for intermediate variable, calculating base vector by choosing intermediate variable acts on
Time.Whole modulated process orderliness is clear, realizes that simply amount of calculation is small compared with conventional method, high precision, real-time, tool
There are certain theory innovation and application value.Solve traditional three level four bridge legs current transformer SVPWM methods computationally intensive, calculate
Precision is low, the problem of poor real, has reached the purpose of the present invention.
Advantage is embodied in：
1st, this method determines reference vector present position based on abc γ coordinate systems, and deterministic process is not related to radical sign computing, carried
High computational accuracy；
2nd, this method is decomposed using start vector to reference voltage, is obtained two level reference voltages, is substituted into two
Level four bridge legs modulation strategy is calculated, and reduces the complexity of modulation strategy.
3rd, in two level modulation strategies, intermediate variable obtains simple, and base vector action time is directly chosen by intermediate variable,
Eliminate the calculating process of action time, it is not necessary to complicated trigonometric function operation, reduce amount of calculation, improve real-time and
Accuracy.
Brief description of the drawings
Fig. 1 is the flow of the space vector width pulse modulation method of three level four bridge legs current transformers according to embodiments of the present invention
Figure.
Fig. 2 is the circuit theory diagrams of three level four bridge legs current transformer according to an embodiment of the invention.
Fig. 3 is the on off state in abc γ coordinate systems according to the three level four bridge legs current transformers of invention one embodiment
Vector distribution map.
Fig. 4 is the projection in abc planes according to the reference vector of invention one embodiment.
Fig. 5 is the judgement figure in big region residing for reference vector according to an embodiment of the invention.
Fig. 6 is the judgement figure of Delta Region residing for reference vector according to an embodiment of the invention.
Fig. 7 is the vector distribution map in Delta Region according to an embodiment of the invention.
Fig. 8 is that three level four bridge legs frequency converters are exported when three-phase reference voltage according to an embodiment of the invention is sinusoidal
It is filtered after oscillogram.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and be not considered as limiting the invention.
The space vector of three level four bridge legs current transformers proposed according to embodiments of the present invention described with reference to the accompanying drawings
Pulse duration modulation method.
Fig. 1 is the flow of the space vector width pulse modulation method of three level four bridge legs current transformers according to embodiments of the present invention
Figure.Wherein, as shown in Fig. 2 the DC side of three level four bridge legs current transformers is three level, Mei Geqiao by two series capacitance partial pressures
Arm is made up of the device for power switching and two anti-paralleled diodes of four series connection, and the midpoint of upper and lower bridge arm passes through clamper two
Pole pipe is connected to the electric capacity midpoint of DC side.Three level four bridge legs current transformers have 34=81 kinds of switch state vectors, are distributed in
Three dimensions, Fig. 3 is distribution map of the 81 kinds of switch state vectors of three level four bridge legs current transformers in abc γ coordinate systems.
As shown in figure 1, the space vector width pulse modulation method of the three level four bridge legs current transformer comprises the following steps：
S1, to the three-phase reference voltage v of three level four bridge legs current transformersaf、vbf、vcfCoordinate Conversion is carried out to obtain abc γ
Coordinate (v under coordinate systema,vb,vc,vγ), and according to coordinate (va,vb,vc,vγ) coordinate components va、vb、vcJudge with reference to arrow
Amount residing big region and Delta Region.
According to one embodiment of present invention, by following formula (1) to three-phase reference voltage vaf、vbf、vcfCarry out coordinate
Conversion：
Wherein, va、vb、vc、vγFor coordinate (va,vb,vc,vγ) coordinate components, vaf、vbf、vcfFor three-phase reference voltage.
According to one embodiment of present invention, in this step, according to coordinate (va,vb,vc,vγ) coordinate components va、vb、
vcJudge the big region and Delta Region residing for reference vector, specifically include：According to coordinate (va,vb,vc,vγ) coordinate components
va、vb、vcJudge the big region residing for reference vector with to coordinate components va、vb、vcIt is modified；According to revised coordinate point
Measure va′、vb′、vcDelta Region residing for ' judgement reference vector.
According to one embodiment of present invention, according to table 1 to coordinate components va、vb、vcIt is modified revised to obtain
Coordinate components va′、vb′、vc′：
Table 1
| Big region | va′ | vb′ | vc′ |
| Ⅰ | va-Vdc/3 | vb+Vdc/6 | vc+Vdc/6 |
| Ⅱ | va-Vdc/6 | vb-Vdc/6 | vc+Vdc/3 |
| Ⅲ | va+Vdc/6 | vb-Vdc/3 | vc+Vdc/6 |
| Ⅳ | va+Vdc/3 | vb-Vdc/6 | vc-Vdc/6 |
| Ⅴ | va+Vdc/6 | vb+Vdc/6 | vc-Vdc/3 |
| Ⅵ | va-Vdc/6 | vb+Vdc/3 | vc-Vdc/6 |
Wherein, VdcFor the DC voltage of three level four bridge legs current transformers.
Specifically, it is assumed that a, b, c three-phase of three level four bridge legs current transformers are respectively v relative to center line f voltageaf、
vbf、vcf, switch periods are set as Ts, DC voltage is Vdc.First by above-mentioned formula (1) to three-phase reference voltage vaf、
vbf、vcfCoordinate Conversion is carried out to obtain the coordinate (v under abc γ coordinate systemsa,vb,vc,vγ), then according to coordinate (va,vb,vc,
vγ) coordinate components va、vb、vcThe big region residing for reference vector is judged, as shown in figure 5, wherein reference vector is in abc planes
On projection as shown in figure 4, coordinate shown in figure is divided by DC voltage VdcCoordinate afterwards.As shown in figure 5, working as vb＜ 0 and
vcDuring ＜ 0, reference vector is in region I；Work as vb≥0、vc＜ 0 and vaWhen >=0, reference vector is in region II；Work as vb≥0、vc
＜ 0 and vaDuring ＜ 0, reference vector is in region III；Work as vb>=0 and vcWhen >=0, reference vector is in region IV；Work as vb＜ 0, vc
>=0 and vaDuring ＜ 0, reference vector is in region V；Work as vb＜ 0, vc>=0 and vaWhen >=0, reference vector is in region VI.
According to coordinate (va,vb,vc,vγ) coordinate components va、vb、vcJudge behind the big region residing for reference vector, root
According to result of determination and by above-mentioned table 1 to coordinate components va、vb、vcIt is modified.For example, when reference vector is in region I,
Revised coordinate components v'a=va-Vdc/ 3, v'b=vb+Vdc/ 6, v'c=vc+Vdc/6.Then according to revised coordinate point
Measure va′、vb′、vcDelta Region residing for ' judgement reference vector, as shown in fig. 6, wherein, working as v'a≥v'bAnd v'b≥v'cWhen,
Reference vector is in Delta Region 1；Work as v'a＜ v'bAnd v'a≥v'cWhen, reference vector is in Delta Region 2；Work as v'a＜ v'b、
v'a＜ v'cAnd v'b≥v'cWhen, reference vector is in Delta Region 3；Work as v'a＜ v'b、v'a＜ v'cAnd v'b＜ v'cWhen, reference
Vector is in Delta Region 4；Work as v'a≥v'b、v'b＜ v'cAnd v'a＜ v'cWhen, reference vector is in Delta Region 5；Work as v'a≥
v'b、v'b＜ v'cAnd v'a≥v'cWhen, reference vector is in Delta Region 6.
S2, big region according to residing for reference vector and Delta Region, which are obtained, defines planar function, and according to defining plane
Function determines start vector.
According to one embodiment of present invention, define planar function and meet relation shown in table 2：
Table 2
For example, when reference vector is in region I and Delta Region 1, its vector is distributed as shown in fig. 7, figure midplane s is
Define planar function vcf+VdcDefine plane corresponding to/2, this define plane by triangular prism be divided into above and below two parts, two parts
It is similar with the triangular prism in two level four bridge legs modulation strategies.Wherein, when reference vector, which is located at, defines plane top, that is, join
Examine vector substitution and define planar function vcf+VdcWhen/2 values calculated are more than zero, it is 1000 to determine start vector；Work as reference vector
Positioned at when defining planar lower, i.e., reference vector substitutes into and defines planar function vcf+VdcWhen/2 values calculated are less than zero, it is determined that rising
Beginning vector is 1001.That is, defining after planar function determines, can be according to the symbol for defining planar function of calculating
(positive and negative) determines start vector.
S3, according to start vector to three-phase reference voltage vaf、vbf、vcfIt is modified, to obtain three-phase reference voltage amendment
Value vaf′、vbf′、vcf′。
According to one embodiment of present invention, according to the relation pair three-phase reference voltage v of table 3af、vbf、vcfBe modified with
Obtain three-phase reference voltage correction value vaf′、vbf′、vcf′：
Table 3
| Start vector | vaf′ | vbf′ | vcf′ |
| 1000 | vaf-Vdc/2 | vbf | vcf |
| 1001 | vaf | vbf+Vdc/2 | vcf+Vdc/2 |
| 1100 | vaf-Vdc/2 | vbf-Vdc/2 | vcf |
| 1101 | vaf | vbf | vcf+Vdc/2 |
| 0100 | vaf | vbf-Vdc/2 | vcf |
| 0101 | vaf+Vdc/2 | vbf | vcf+Vdc/2 |
| 0110 | vaf | vbf-Vdc/2 | vcf-Vdc/2 |
| 0111 | vaf+Vdc/2 | vbf | vcf |
| 0010 | vaf | vbf | vcf-Vdc/2 |
| 0011 | vaf+Vdc/2 | vbf+Vdc/2 | vcf |
| 1010 | vaf-Vdc/2 | vbf | vcf-Vdc/2 |
| 1011 | vaf | vbf+Vdc/2 | vcf |
For example, when start vector is 1000, revised three-phase reference voltage v'af=vaf-Vdc/ 2, v'bf=vbf,
v'cf=vcf。
S4, to three-phase reference voltage correction value vaf′、vbf′、vcf' carry out linear operation, with obtain six intermediate variable x,
Y, z, s, q, w, and any three intermediate variables calculating base vector V in six intermediate variable x, y, z, s, q, w1、V2、V3
Action time t1、t2、t3。
According to one embodiment of present invention, by following formula (2) to three-phase reference voltage correction value vaf′、vbf′、
vcf' carry out linear operation：
Wherein, x, y, z, s, q, w are intermediate variable.
According to one embodiment of present invention, action time t1、t2、t3Expressed by following formula (3)：
Wherein, t1、t2、t3For action time, TsFor switch periods.
Specifically, to three-phase reference voltage vaf、vbf、vcf, can be by above-mentioned formula (2) to three after being modified
Phase reference voltage correction value vaf′、vbf′、vcf' carry out linear operation to obtain six intermediate variable x, y, z, s, q, w, Ran Hougen
Base vector V is calculated according to any three intermediate variables in six intermediate variable x, y, z, s, q, w1、V2、V3Action time t1、
t2、t3, for example, when reference vector is in big region I, Delta Region 1 and tetrahedron T1, above-mentioned formula (3) can be passed through
To calculate base vector V1、V2、V3Action time t1、t2、t3。
Table 4 give start vector for 1000 when, in two level four bridge legs modulation strategies, tetrahedron Rule of judgment and right
The base vector action time answered.In table 4, each bridge arm represents V with off state 2x1、Vx2Conducting, Vx3、Vx4Shut-off；On off state
1 represents Vx2、Vx3Conducting, Vx1、Vx4Shut-off；On off state 0 represents Vx3、Vx4Conducting, Vx1、Vx2Turn off (wherein, x=a, b, c).
Table 4
S5, according to action time t1、t2、t3Switching device in three level four bridge legs current transformers is controlled, so that three
The actual output voltage and reference voltage of level four bridge legs current transformer are equivalent.Seven segmentation symmetric modulations are used, are tied more than
Really, it can be deduced that the switching time of three each device for power switching of level four bridge legs current transformer.
Fig. 8 is three level four bridge legs current transformers output three-phase voltage low-pass filtered device filter when reference voltage is three phase sine
Waveform after ripple, from figure 8, it is seen that making three level four bridge legs output voltages and reference voltage etc. by the switching of on off state
Effect, so as to demonstrate the correctness and validity of the present invention.
The space vector width pulse modulation method of three level four bridge legs current transformers according to embodiments of the present invention, first to three electricity
The three-phase reference voltage v of flat four bridge legs current transformeraf、vbf、vcfCoordinate Conversion is carried out to obtain the coordinate under abc γ coordinate systems
(va,vb,vc,vγ), and according to coordinate (va,vb,vc,vγ) coordinate components va、vb、vcJudge the big region residing for reference vector
And Delta Region, then the big region according to residing for reference vector and Delta Region, which are obtained, defines planar function, and according to defining
Planar function determines start vector, and according to start vector to three-phase reference voltage vaf、vbf、vcfIt is modified, to obtain three
Phase reference voltage correction value vaf′、vbf′、vcf', then to three-phase reference voltage correction value vaf′、vbf′、vcf' linear operation is carried out,
To obtain six intermediate variable x, y, z, s, q, w, and any three middle anaplasias in six intermediate variable x, y, z, s, q, w
Amount calculates base vector V1、V2、V3Action time t1、t2、t3, finally according to action time t1、t2、t3Three level four bridge legs are become
Switching device in stream device is controlled.Whole modulated process orderliness is clear, realizes simple, the amount of calculation compared with conventional method
Small, high precision is real-time, solves that traditional three level four bridge legs current transformer SVPWM methods are computationally intensive, and computational accuracy is low,
The problem of poor real.Specifically, because the modulator approach is to judge position residing for reference vector based on abc γ coordinate systems
Put, deterministic process is not related to radical sign budget, improves computational accuracy, while also being divided using start vector reference voltage
Solution, obtains two level reference voltages, to be calculated by two level four bridge legs modulation strategies, reduces the complexity of modulator approach
Degree, and in two level four bridge legs modulation strategies, intermediate variable obtains simple, and the action time of base vector is straight by intermediate variable
Selecting takes, eliminate the calculating process of action time, it is to avoid complicated trigonometric function operation, reduces amount of calculation, improves
Real-time and accuracy.
In the description of the invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", " on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outer ", " up time
The orientation or position relationship of the instruction such as pin ", " counterclockwise ", " axial direction ", " radial direction ", " circumference " be based on orientation shown in the drawings or
Position relationship, is for only for ease of the description present invention and simplifies description, rather than indicate or imply that the device or element of meaning must
There must be specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are only used for describing purpose, and it is not intended that indicating or implying relative importance
Or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or
Implicitly include at least one this feature.In the description of the invention, " multiple " are meant that at least two, such as two, three
It is individual etc., unless otherwise specifically defined.
In the present invention, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " fixation " etc.
Term should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integrally；Can be that machinery connects
Connect or electrically connect；Can be joined directly together, can also be indirectly connected to by intermediary, can be in two elements
The connection in portion or the interaction relationship of two elements, unless otherwise clear and definite restriction.For one of ordinary skill in the art
For, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature can be with "above" or "below" second feature
It is that the first and second features are directly contacted, or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature are directly over second feature or oblique upper, or be merely representative of
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is immediately below second feature or obliquely downward, or is merely representative of fisrt feature level height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means to combine specific features, structure, material or the spy that the embodiment or example are described
Point is contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.Moreover, specific features, structure, material or the feature of description can be with office
Combined in an appropriate manner in one or more embodiments or example.In addition, in the case of not conflicting, the skill of this area
Art personnel can be tied the not be the same as Example or the feature of example and non-be the same as Example or example described in this specification
Close and combine.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, one of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changed, replacing and modification.
Claims (2)
1. a kind of space vector width pulse modulation method of three level four bridge legs current transformer, it is characterised in that comprise the following steps：
S1, to the three-phase reference voltage v of the three level four bridge legs current transformeraf、vbf、vcfCoordinate Conversion is carried out to obtain abc γ
Coordinate (v under coordinate systema,vb,vc,vγ), and according to the coordinate (va,vb,vc,vγ) coordinate components va、vb、vcJudge ginseng
Big region and the Delta Region residing for vector are examined, wherein, by below equation to the three-phase reference voltage vaf、vbf、vcfCarry out
Coordinate transform：
Wherein, va、vb、vc、vγFor the coordinate (va,vb,vc,vγ) coordinate components, vaf、vbf、vcfIt is three-phase reference electricity
Pressure；
Wherein, according to the coordinate (va,vb,vc,vγ) coordinate components va、vb、vcJudge reference vector residing for big region and
Delta Region, is specifically included：According to the coordinate (va,vb,vc,vγ) coordinate components va、vb、vcJudge the reference vector institute
The big region at place is with to the coordinate components va、vb、vcIt is modified；According to revised coordinate components va′、vb′、vc' judge
Delta Region residing for the reference vector, wherein, according to following table to the coordinate components va、vb、vcIt is modified to obtain
State revised coordinate components va′、vb′、vc′：
Wherein, VdcFor the DC voltage of the three level four bridge legs current transformer；
S2, big region and Delta Region according to residing for the reference vector, which are obtained, defines planar function, and is defined according to described
Planar function determines start vector；
S3, according to the start vector to the three-phase reference voltage vaf、vbf、vcfIt is modified, to obtain three-phase reference voltage
Correction value vaf′、vbf′、vcf' wherein, the three-phase reference voltage v according to the relation pair of following tableaf、vbf、vcfIt is modified to obtain
Obtain the three-phase reference voltage correction value vaf′、vbf′、vcf′：
Wherein, VdcFor the DC voltage of the three level four bridge legs current transformer；
S4, to the three-phase reference voltage correction value vaf′、vbf′、vcf' carry out linear operation, with obtain six intermediate variable x,
Y, z, s, q, w, and any three intermediate variables calculating base vector V in described six intermediate variable x, y, z, s, q, w1、
V2、V3Action time t1、t2、t3, wherein, by below equation to the three-phase reference voltage correction value vaf′、vbf′、vcf' enter
Row linear operation：
Wherein, x, y, z, s, q, w are the intermediate variable, vaf′、vbf′、vcf' it is the three-phase reference voltage correction value；
Wherein, the action time t1、t2、t3Expressed by following formula：
Wherein, t1、t2、t3For the action time, x, y, z is the intermediate variable, TsFor switch periods, VdcFor described three electricity
The DC voltage of flat four bridge legs current transformer；
S5, according to the action time t1、t2、t3Switching device in the three level four bridge legs current transformer is controlled.
2. the space vector width pulse modulation method of three level four bridge legs current transformer as claimed in claim 1, it is characterised in that institute
State the relation that planar function meets following table that defines：
Wherein, VdcFor the DC voltage of the three level four bridge legs current transformer.
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