CN108377105B - A kind of triangle connection Cascade H bridge inverter based on space vector modulating method - Google Patents

A kind of triangle connection Cascade H bridge inverter based on space vector modulating method Download PDF

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CN108377105B
CN108377105B CN201810300014.3A CN201810300014A CN108377105B CN 108377105 B CN108377105 B CN 108377105B CN 201810300014 A CN201810300014 A CN 201810300014A CN 108377105 B CN108377105 B CN 108377105B
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triangle
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basic
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CN108377105A (en
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王翠
欧阳俊铭
张兴旺
曾瑄
崔晓斌
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Nanchang Institute of Technology
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • H02M1/007—Plural converter units in cascade

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

The invention discloses a kind of, and the triangle based on space vector modulating method connects Cascade H bridge inverter, and triangle connects the three-phase connection triangular in shape of Cascade H bridge inverter, and every phase is cascaded by 2n H bridge；Each H bridge includes 4 IGBT；Control is implemented to triangle connection Cascade H bridge inverter using based on space vector modulating method；The space vector modulating method is based on triangular trajectory model；Using unique space vector modulating method, so that triangle connection cascaded H-bridges invertor operation is more stable and easily controllable.

Description

A kind of triangle connection Cascade H bridge inverter based on space vector modulating method
Technical field
The invention belongs to the cascaded H-bridges multi-electrical level inverter fields of triangle connection, are related to a kind of based on space vector tune The triangle of method processed connects Cascade H bridge inverter.
Background technique
Cascade connection multi-level inversion transformation technique is widely used in high-voltage high-power converter, its advantage is that power can be utilized The cascade of unit is realized and is divided and effective dilatation.There are stars and triangle two for high-power H bridge cascaded multilevel inverter The mode of connection is planted, cascade module bears phase voltage under star-star connection mode, therefore cost can be reduced under low voltage condition, but It is that its reliability is not high, is difficult to control under failure；Delta connection mode cascade module needs to bear line voltage, short trouble Performance is more excellent, is suitable for high pressure, hicap, typical application such as high-voltage large-capacity static synchronous compensator.
The modulator approach of cascaded multilevel inverter is broadly divided into nearest level modulation, carrier wave stacking modulation, phase-shifting carrier wave Modulation, space vector modulation etc..Cascaded multilevel inverter space vector modulating method has humorous compared with carrier modulating method Wave property is good, voltage utilization is high, switching loss is low, is convenient for the advantages that Digital Implementation.
But space vector modulating method is greatly increased with the increase of concatenation unit, basic vector quantity, and one corresponding Basic vector, there are multiple Redundanter schalter state vectors, the selection of switch state vector and its action time calculating are extremely multiple It is miscellaneous, cause space vector modulating method to be realized difficult, and inverter is made to be difficult to control, stability is poor.
Therefore, it is necessary to design a kind of new more level Cascade H bridge inverters.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of, and the triangle based on space vector modulating method connects grade Join H bridge inverter, the inverter is easily controllable and reliable for operation and stablize.
The technical solution of invention is as follows:
A kind of triangle connection Cascade H bridge inverter based on space vector modulating method, which is characterized in that triangle connects The three-phase connection triangular in shape of Cascade H bridge inverter is connect, and every phase is cascaded by 2n H bridge；Each H bridge includes 4 IGBT；
Control is implemented to triangle connection Cascade H bridge inverter using based on space vector modulating method；
The space vector modulating method is based on triangular trajectory model；
Triangular trajectory model uses α '-β ' coordinate system, the expression formula of the basic vector in α '-β ' coordinate system are as follows:
In formula, a, b and c respectively indicate three components of switch state vector (a, b, c)；Triangle rail Mark model, is characterized by following formula:
(0 m≤1 <)；M indicates triangle connection type line voltage modulation system Number；
Space vector modulation is implemented to the Cascade H bridge inverter that triangle connects based on triangular trajectory model；
Triangular trajectory model is equivalent to star-like locus model, as follows:
M ' expression star-like connection mode phase voltage the index of modulation, has
Star-like locus model refers to that n H bridge cascades (i.e. every phase is cascaded by n H bridge) under star-like connection mode Multi-electrical level inverter output voltage space vector locus model；
According to the equivalent relation of triangular trajectory model and star-like locus model, therefore realized based on star-like locus model to three The Cascade H bridge inverter of Angle connection implements space vector modulation.
Star-like connection cascaded H-bridges multi-electrical level inverter output reference voltage space vector locus model is sampled, is counted It calculates near sample reference vector Vr(αpr', βpr') three basic vectors, and using these three basic vectors as equivalent basic Vector calculates the equivalent basic vector action time of synthesis sample reference vector using voltage-second balance principle, directly using basic Control signal of the vector as triangle connection each phase of Cascade H bridge inverter；
Wherein, Vr(αpr', βpr') in VrIndicate reference vector name, (αpr', βpr') indicate reference vector coordinate.
The method for calculating the basic vector near sample reference vector are as follows: respectively to reference voltage vector VrCoordinate point Amount carries out being rounded to obtain basic vector V0(α0', β0'), in which: α0'=floor (αpr'),
β0'=floor (βpr′)；Floor (*) is downward bracket function；
Basic vector includes V0(α0', β0′)、V1(α0'+1, β0′)、V2(α0', β0'+1), V3(α0'+1, β0′+1)；
The first situation: as (αpr′-α0′)+(βpr′-β0')≤1 when, with basic vector V0、V1、V2Time sharing system synthesized reference Voltage vector Vr；" time sharing system " is a kind of calculation method, is not simply to combine.
Second situation: as (αpr′-α0′)+(βpr′-β0') > 1 when, with basic vector V3、V1、V2Time sharing system synthesized reference Voltage vector Vr。
The first situation:
When utilize V0、V1、V2Time sharing system synthesized reference voltage vector VrWhen:
(1) in basic vector V0Action time section, that is, use-β0′、α0′+β0′、-α0' respectively as triangle connection inverter The control signal of AB phase, BC phase, CA phase；
(2) basic vector V1Action time section, that is, use-β0′、α0′+β0′+1、-(α0'+1) it is connected respectively as triangle inverse Become the control signal of device AB phase, BC phase, CA phase；
(3) in basic vector V2Action time section, i.e., with-(β0′+1)、α0′+β0′+1、-α0' connected respectively as triangle The control signal of inverter AB phase, BC phase, CA phase.
Second situation:
When utilize V3、V1、V2Time sharing system synthesized reference voltage vector VrWhen:
(1) in basic vector V3Action time section, i.e., with-(β0′+1)、α0′+β0′+2、-(α0'+1) respectively as triangle Connect the control signal of inverter AB phase, BC phase, CA phase；
(2) in basic vector V1Action time section, that is, use-β0′、α0′+β0′+1、-(α0'+1) it is connected respectively as triangle The control signal of inverter AB phase, BC phase, CA phase；
(3) in basic vector V2Action time section, i.e., with-(β0′+1)、α0′+β0′+1、-α0' connected respectively as triangle The control signal of inverter AB phase, BC phase, CA phase.
Preferably, n=3~12.
Preferably, n=3.
The purpose of the present invention is the H bridge cascaded multilevel inverters for triangle connection, based on basic under α '-β ' coordinate The characteristics of vector is line voltage vector directly uses sampling gained line voltage control vector to believe as the control of three-phase bridge arm Number, realize the control of triangle connection cascaded H-bridges multi-electrical level inverter.
In order to achieve the above objectives, the technical solution of the present invention is as follows:
A kind of quick space vector modulating method of the cascaded H-bridges multi-electrical level inverter of triangle connection is based on α '-β ' Coordinate system, the space vector modulating method of the cascaded H-bridges multi-electrical level inverter suitable for triangle connection, α '-β ' coordinate system are By 45 ° of rotation counterclockwise and the coordinate system that axial scale obtains is compressed by traditional alpha-beta coordinate system, the advantages of coordinate system is base This vector is entirely located on rounded coordinate point, and the coordinate of vector means that the value of line voltage output level；The quick space Vector modulation method is based on α '-β ' coordinate system, and the equivalent star for calculating triangle connection cascaded H-bridges multi-electrical level inverter connects Cascaded H-bridges multi-electrical level inverter model is connect, the phase voltage control of the equivalent star-like connection cascaded H-bridges multi-electrical level inverter model is utilized Signal processed calculates vector locus expression formula, this vector locus is reference vector track, samples to reference vector track, and utilize The principle of voltage-second balance calculates the equivalent basic vector of synthesized reference vector, and the coordinate of gained basic vector is line voltage vector Coordinate can be realized directly using each phase of line voltage vector controlled triangle connection cascaded H-bridges multi-electrical level inverter to inverse Become the modulation of device.This method does not need to calculate the switch state signal of the corresponding each phase of basic vector, and there is no the redundancies of each phase Switch state vector calculates, and enormously simplifies cascaded multilevel inverter space vector modulating method, and can guarantee that triangle connects The sum of the three-phase output voltage for connecing Cascade H bridge inverter is zero at any time, keeps output voltage full symmetric.Triangle connects A kind of quick space vector modulating method of the cascaded H-bridges multi-electrical level inverter connect, comprising the following specific steps
Step 1: being converted to α '-β ' coordinate system for traditional alpha-beta coordinate system, Traditional Space vector modulation method it is basic Vector expression are as follows:
In formula (1), α and β respectively indicate the coordinate value of basic vector in alpha-beta coordinate system, and it is mostly electric that a, b, c respectively indicate cascade The phase voltage output level of flat inverter three-phase, from formula (1) as can be seen that basic vector (α, β) is distributed in non-integer coordinates On point, and since formula (1) is Linear Equations, there are redundancies for switch state vector (a, b, c).
Alpha-beta coordinate by 45 ° of rotation counterclockwise and is compressed axial scale and obtains α '-β ' coordinate system, on α '-β ' coordinate system The expression formula of basic vector are as follows:
In formula (2), α ' and β ' respectively indicates the coordinate value of basic vector in α '-β ' coordinate system, can from formula (2) Out, basic vector (α ', β ') is distributed on rounded coordinate point, and α ', β ' and α '+β ' respectively indicate inverter output line voltage Level.
Step 2: the equivalent more level of star-like connection cascaded H-bridges of construction triangle connection cascaded H-bridges multi-electrical level inverter are inverse Become device model, can be obtained according to formula (2), the phase voltage output level of the n cascade multi-electrical level inverter of H bridge under star-like connection mode Number is 2n+1, and line voltage output level number is 4n+1, and therefore, each phase is by the cascade triangle connection type inversion of 2n H bridge Device, each phase of star-like connection equivalent circuit are n H bridge cascade.
Step 3: under α '-β ' coordinate system, the 2n cascade multi-electrical level inverter of H bridge under triangle connection type is established Output voltage space vector locus model are as follows:
In formula, αlr' and βlr' respectively indicate α '-β ' coordinate system intermediate cam shape connection type inverter line voltage reference vector Coordinate value, m indicates that the triangle connection type line voltage index of modulation, index of modulation m are corresponding different reference voltage.αlr′ And βlr' in, l indicates line voltage, and r indicates reference.
Step 4: under α '-β ' coordinate system, the cascade multi-electrical level inverter output of n H bridge under star-like connection mode is established Space vector of voltage locus model, can according to the relationship between formula (3) and the phase voltage and line voltage of star-like connection inverter :
It enablesIt can obtain:
In formula, αpr' and βpr' respectively indicate star connection type inverter phase voltage reference vector in α '-β ' coordinate system Coordinate value, the m ' expression star-like connection mode phase voltage index of modulation, due to 0 m '≤1 <,
Step 5: to star-like connection cascaded H-bridges multi-electrical level inverter output reference voltage space vector locus model (5) into Row sampling, calculates near sample reference vector Vr(αpr', βpr') three basic vector (V hereinr(αpr', βpr') indicate Reference vector, wherein VrIndicate reference vector name, (αpr', βpr') indicate the coordinate of reference vector, rear same), and these three bases This vector is acted on as equivalent basic vector using the equivalent basic vector that voltage-second balance principle calculates synthesis sample reference vector Time, by formula (2) it is found that the abscissa of basic vector, ordinate and the sum of ordinate and abscissa respectively indicate three The output level of line voltage, therefore can be directly using basic vector as the control of triangle connection each phase of Cascade H bridge inverter Signal processed.
The method for calculating the basic vector near sample reference vector are as follows: respectively to reference voltage vector Vr(αpr', βpr') round up and be rounded downwards,
V0=floor (Vr), V3=ceil (Vr) in (6) formula, floor (Vr) indicate to reference vector VrEach point Amount is rounded downwards, V0Coordinate be (α0', β0'), i.e. α0'=floor (αpr'), β0'=floor (βpr'), ceil (Vr) indicate To reference vector VrEach component round up, i.e. V3Coordinate be (α0'+1, β0′+1).With basic vector V0And V3It is diagonal Line determines a unit square, and the basic vector of other two vertex correspondence of unit square is respectively V1(α0'+1, β0′)、V2(α0', β0'+1), as (αpr′-α0′)+(βpr′-β0')≤1 when, according to voltage-second balance principle, with basic vector V0、V1、 V2Time sharing system synthesized reference voltage vector Vr, as (αpr′-α0′)+(βpr′-β0') > 1 when, with basic vector V3、V1、V2Time sharing system Synthesized reference voltage vector Vr。
It is specific as follows:
The first situation:
When utilize V0、V1、V2Time sharing system synthesized reference voltage vector VrWhen:
(1) in basic vector V0Action time section, that is, use-β0′、α0′+β0′、-α0' respectively as triangle connection inverter The control signal of AB phase, BC phase, CA phase；
(2) in basic vector V1Action time section, that is, use-β0′、α0′+β0′+1、-(α0'+1) it is connected respectively as triangle The control signal of inverter AB phase, BC phase, CA phase；
(3) in basic vector V2Action time section, i.e., with-(β0′+1)、α0′+β0′+1、-α0' connected respectively as triangle The control signal of inverter AB phase, BC phase, CA phase.
Second situation:
When utilize V3、V1、V2Time sharing system synthesized reference voltage vector VrWhen:
(1) in basic vector V3Action time section, i.e., with-(β0′+1)、α0′+β0′+2、-(α0'+1) respectively as triangle Connect the control signal of inverter AB phase, BC phase, CA phase；
(2) in basic vector V1Action time section, that is, use-β0′、α0′+β0′+1、-(α0'+1) it is connected respectively as triangle The control signal of inverter AB phase, BC phase, CA phase；
(3) in basic vector V2Action time section, i.e., with-(β0′+1)、α0′+β0′+1、-α0' connected respectively as triangle The control signal of inverter AB phase, BC phase, CA phase.
The utility model has the advantages that
For space vector modulation algorithm as concatenation unit increases, basic vector is greatly increased, and there are a large amount of redundancies Switch state vector, the selection of switch state vector and its action time calculate the problems such as extremely complex, and the present invention is based on α '-β ' Coordinate utilizes the sum of the abscissa of star-like connection cascaded multilevel inverter basic vector, ordinate, abscissa and ordinate point The pass of three line voltage vectors of three-phase inverter and the phase voltage of star-like connection three-phase inverter and line voltage is not corresponded to System directlys adopt and synthesizes the basic vector of phase voltage reference vector under star-like connection mode as the offline electricity of triangle connection type The control signal of pressure is to control inverter.The control of the inverter does not need to calculate the switch state that basic vector corresponds to each phase Signal enormously simplifies cascaded multilevel inverter space vector modulation there is no a large amount of Redundanter schalter state vector is calculated Method.
To sum up, the present invention does not need to calculate the corresponding switch state vector of basic vector, Redundanter schalter shape is not present State vector simplifies amount of calculation, substantially increases the convenience and control efficiency of control.
The present invention is based on the characteristics that α '-β ' coordinate down space phasor coordinate is line voltage vector, for delta connection Mode H bridge cascaded multilevel inverter is directly realized by the modulation of line voltage using sampling gained space vector.Moreover, this inverse The cascade number class for becoming device can be with flexible expansion.
Detailed description of the invention
Fig. 1 is that star-like connection mode H bridge cascades inverter circuit line voltage and phase voltage relation schematic diagram；
Fig. 2 is the cascade inverse circuit topology structure of the lower six H bridges of triangle connection type；
Fig. 3 is the cascade inverse circuit topology structure of the lower three H bridges of star-like connection mode；
Fig. 4 is the cascade inverter space vector distribution of three H bridges of star-like connection mode and phase voltage reference vector track；
Fig. 5 is the 2n cascade inverse circuit topology structure of H bridge under triangle connection type；
Fig. 6 is the n cascade inverse circuit topology structure of H bridge under star-like connection mode.
Specific embodiment
The present invention is described in further details below with reference to the drawings and specific embodiments:
The H bridge cascaded inverter output line voltage of the signal of solid triangle shown in embodiment 1: Fig. 1 and dotted line star-like connection H bridge cascaded inverter output line voltage it is equal.
The cascade inverse circuit topology structure of the lower six H bridges of triangle connection type shown in Fig. 2, line voltage output level It is ± 6, ± 5, ± 4, ± 3, ± 2, ± 1,0, adds up to 13 level, the lower three H bridges of star-like connection mode shown in Fig. 3 is cascade inverse Become circuit topological structure, line voltage output level is ± 6, ± 5, ± 4, ± 3, ± 2, ± 1,0, adds up to 13 level, thus It can be concluded that the line voltage level number of the cascade inverse circuit topology structure output of 2n H bridge is 4n+ under triangle connection type 1, the line voltage level number of the cascade inverse circuit topology structure output of n H bridge is 4n+1, i.e. two kinds of companies under star-like connection mode It connects that output line voltage level number under mode is completely the same, therefore the line voltage vector exported under star-like connection mode can be used and make Phase voltage for triangle connection controls signal.Line voltage control letter discussed herein, being exported using star-like connection mode Number it can be used to control each phase of triangle connection type.
The cascade inverter line voltage of the lower six H bridges of triangle connection type exports reference vector locus model are as follows:
In order to realize line voltage and the triangle connection side of the cascade inverter circuit output of the lower three H bridges of star-like connection mode The line voltage of the cascade inverter circuit output of the lower six H bridges of formula is equal, the cascade inverter circuit of the lower three H bridges of star-like connection mode Line voltage reference vector model must satisfy formula (7).Since line voltage is phase voltage under star-like connection modeTimes, that is, have:
Therefore formula (7) may be expressed as:
It enablesFormula (9) simplifies are as follows:
Inverter is set to be not operate at the range of ovennodulation, it is necessary to meet 0 m '≤1 <, therefore,
Formula (10) is the cascade inverter phase voltage reference vector locus model of the lower three H bridges of star-like connection mode.? Under α '-β ' coordinate system, can drawing the cascade inverter circuit of the lower three H bridges of star-like connection mode according to formula (2) and formula (10), it is empty Between vector distribution and phase voltage reference vector track as shown in figure 4, in figure " * " point indicate basic vector, reference vector track is Ellipse, according to the size variation of index of modulation m ', the long short radius of reference vector track changes, the index of modulation as shown in the figure M '=1, it can be seen from the figure that basic vector is located at unit rounded coordinate point.
Reference vector track shown in formula (10) is sampled, three nearest basic vectors of distance reference vector are calculated, Utilize voltage-second balance principle synthesized reference vector.The solid triangle and void that represented basic vector forms such as " * " point in Fig. 4 Thread triangle, wherein solid triangle contains reference vector track, and three vertex vectors of solid triangle can be used to close Any one reference vector on reference vector track for being included at the triangle.
By formula (2) it is found that the abscissa α '=a-c, ordinate β '=- a+b, α '+β '=b-c, a of basic vector, b, c divide Not Biao Shi in Fig. 3 the output of A, B, C three-phase phase voltage, then the line voltage between α ' expression A phase and C phase, β ' expression A phase and B phase Between line voltage, the line voltage between α '+β ' expression B phase and C phase uses-α ' as triangle according to the principle of three-phase symmetrical The control signal of CA phase under connection type uses-β ' as the control signal of AB phase under triangle connection type, use α '+β ' as Six cascade inverters of H bridge lower to triangle connection type can be realized in the control signal of BC phase under triangle connection type Control.
Fig. 5 show the 2n cascade inverse circuit topology structure of H bridge, Fig. 6 under triangle connection type and show star The n cascade inverse circuit topology structure of H bridge under connection type, similarly can be inverse using n H bridge cascade under star-like connection mode Become the phase voltage modulated signal of device to control the line voltage of 2n H bridge cascaded inverter under triangle connection type.
How the driving signal of each IGBT is formed as existing mature technology.
In Fig. 1: 1,2,3:2n H bridge cascade gained module
1 ', 2 ', 3 ': n H bridge cascade gained module
In Fig. 2-3,5-6, QAij、QBij、QCijRefer to power switch tube IGBT.

Claims (6)

1. a kind of triangle based on space vector modulating method connects Cascade H bridge inverter, which is characterized in that triangle connection The connection triangular in shape of the three-phase of Cascade H bridge inverter, and every phase is cascaded by 2n H bridge；Each H bridge includes 4 IGBT；
Control is implemented to triangle connection Cascade H bridge inverter using based on space vector modulating method；
The space vector modulating method is based on triangular trajectory model；
Triangular trajectory model uses α '-β ' coordinate system, the expression formula of the basic vector in α '-β ' coordinate system are as follows:
In formula, three components of a, b and c difference switch state vector (a, b, c)；
Triangular trajectory model, is characterized by following formula:
M indicates the triangle connection type line voltage index of modulation；
Space vector modulation is implemented to the Cascade H bridge inverter that triangle connects based on triangular trajectory model；
Triangular trajectory model is equivalent to star-like locus model, as follows:
M' indicates the star-like connection mode phase voltage index of modulation, has
Star-like locus model refers to the cascade multi-electrical level inverter output voltage space vector rail of n H bridge under star-like connection mode Mark model；
According to the equivalent relation of triangular trajectory model and star-like locus model, therefore realized based on star-like locus model to triangle The Cascade H bridge inverter of connection implements space vector modulation.
2. the triangle according to claim 1 based on space vector modulating method connects Cascade H bridge inverter, feature It is, star-like connection cascaded H-bridges multi-electrical level inverter output reference voltage space vector locus model is sampled, calculates most Close to sample reference vector Vr(αpr',βpr') three basic vectors, and using these three basic vectors as equivalent basic vector, The equivalent basic vector action time of synthesis sample reference vector is calculated using voltage-second balance principle, is directly made using basic vector The control signal of each phase of Cascade H bridge inverter is connected for triangle；
Wherein, Vr(αpr',βpr') in VrIndicate sample reference vector name, (αpr',βpr') indicate reference vector coordinate.
3. the triangle according to claim 2 based on space vector modulating method connects Cascade H bridge inverter, feature It is, the method for calculating the basic vector near sample reference vector are as follows: respectively to sample reference vector VrCoordinate components It carries out being rounded to obtain basic vector V0(α0',β0'), in which: α0'=floor (αpr'), β0'=floor (βpr')；Floor (*) is Downward bracket function；
Basic vector includes V0(α0',β0')、V1(α0'+1,β0')、V2(α0',β0'+1), V3(α0'+1,β0'+1)；
The first situation: as (αpr'-α0')+(βpr'-β0')≤1 when, with basic vector V0、V1、V2Time sharing system synthesizes sample reference Vector Vr；
Second situation: as (αpr'-α0')+(βpr'-β0') > 1 when, with basic vector V3、V1、V2Time sharing system synthesizes sample reference Vector Vr。
4. the triangle according to claim 3 based on space vector modulating method connects Cascade H bridge inverter, feature It is,
The first situation:
When utilize V0、V1、V2Time sharing system synthesizes sample reference vector VrWhen:
(1) in basic vector V0Action time section, that is, use-β0'、α0'+β0'、-α0' inverse respectively as triangle connection cascaded H-bridges Become the control signal of device AB phase, BC phase, CA phase；
(2) in basic vector V1Action time section, that is, use-β0'、α0'+β0'+1、-(α0'+1) it is cascaded respectively as triangle connection The control signal of H bridge inverter AB phase, BC phase, CA phase；
(3) in basic vector V2Action time section, i.e., with-(β0'+1)、α0'+β0'+1、-α0' cascaded respectively as triangle connection The control signal of H bridge inverter AB phase, BC phase, CA phase；
Second situation:
When utilize V3、V1、V2Time sharing system synthesizes sample reference vector VrWhen:
(1) in basic vector V3Action time section, i.e., with-(β0'+1)、α0'+β0'+2、-(α0'+1) it is connected respectively as triangle The control signal of Cascade H bridge inverter AB phase, BC phase, CA phase；
(2) in basic vector V1Action time section, that is, use-β0'、α0'+β0'+1、-(α0'+1) it is cascaded respectively as triangle connection The control signal of H bridge inverter AB phase, BC phase, CA phase；
(3) in basic vector V2Action time section, i.e., with-(β0'+1)、α0'+β0'+1、-α0' cascaded respectively as triangle connection The control signal of H bridge inverter AB phase, BC phase, CA phase.
5. the triangle according to claim 1-4 based on space vector modulating method connects cascaded H-bridges inversion Device, which is characterized in that n=3~12.
6. the triangle according to claim 1-4 based on space vector modulating method connects cascaded H-bridges inversion Device, which is characterized in that n=3.
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