CN107919808A - The space vector modulating method of 15 switch converters - Google Patents
The space vector modulating method of 15 switch converters Download PDFInfo
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- CN107919808A CN107919808A CN201711309801.6A CN201711309801A CN107919808A CN 107919808 A CN107919808 A CN 107919808A CN 201711309801 A CN201711309801 A CN 201711309801A CN 107919808 A CN107919808 A CN 107919808A
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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
- H02M7/53873—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 with digital control
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Abstract
The present invention provides a kind of space vector modulating method of 15 switch converters, the method comprising the steps of, and 15 switch converters voltage vector-diagrams can be mapped as two 12 switch converters voltage vector-diagrams, and upper exchange end reference voltage vector is exchanged end reference voltage vector with is mapped in two 12 switch converters voltage vector-diagrams respectively；12 switch converters voltages effect vector is selected on 12 switching vector selector figures and determines voltage vector action time, 12 obtained switch converters voltages effect vector is mapped to 15 switch converters voltage vector space planes from 12 switch converters voltage space vector planes, while 12 switch converters voltage vector action times were converted to for 15 switch converters voltage vector action times.Beneficial effect is this process simplify the complexity of 15 switch converters modulator approaches, easy to Digital Realization.Contribute to the working mechanism of 15 switch converters of understanding, can expand in the SVPWM modulation of other electrical level inverters.
Description
Technical field
The invention belongs to the control technology of Multi- Switch converter, and in particular to a kind of space vector of 15 switch converters
Modulator approach.
Background technology
As power inverter minimizes, the continuous development of high reliability and low-power consumption, scholars are to power inverter
The improvement of topological structure is made that extensive work, and achieves a large amount of achievements.
The controllability for increasing the system of improving of 15 switch converters voltage vectors, and also reduced compared to nine switches
The voltage stress that partial switch is born.
Space Vector Modulation Strategy has been widely used for the control of power inverter, can using Space Vector Modulation Strategy
Realize the control of different type power inverter, but the Space Vector Modulation Strategy of different topology structure power inverter is not
Together, the space vector modulating method of 15 switch converters is together decided on by the voltage vector of upper and lower two ac output ends
The working status of switching device, rather than single voltage vector determines the on off state of switching device in traditional sense.
The content of the invention
For the work characteristics of 15 switch converters, it is an object of the invention to provide a kind of 15 switch converters
Space vector modulating method, this method are of the invention at the same time suitable for same frequency and the alien frequencies operating mode of 15 switch converters
Modulation strategy can simplify modulated process, and improve voltage utilization.
To achieve the above object, the present invention provides a kind of space vector modulating method of 15 switch converters, including such as
Lower step：
1. 15 switch converters voltage vector-diagrams can be mapped as two 12 switch converters voltage vector-diagrams, will be upper
Exchange end reference voltage vector exchanges end reference voltage vector with and is mapped in two 12 switch converters voltage vectors respectively
Figure.
2. 12 switch converters voltages effect vector is selected on 12 switching vector selector figures and determines voltage vector effect
Time, 12 obtained switch converters voltages effect vector is mapped to from 12 switch converters voltage space vector planes
15 switch converters voltage vector space planes, while 12 switch converters voltage vector action times were converted to 15
Switch converters voltage vector action time.
Present invention has the advantages that application of the space vector modulating method on 15 switch converters is the method achieve,
The device of detection output voltage electric current is eliminated compared to existing control method and carries out the complex control processes such as PI controls, is made
Obtaining the design of control system becomes simple；The application of space vector modulating method realizes the raising of voltage utilization, while
Reduce the switching loss in 15 switching converter operations.This method helps to understand the working machine of 15 switch converters
Reason, and can be readily extended in the SVPWM modulation of other electrical level inverters, the application to 15 switch converters
With important practical value.
Brief description of the drawings
Fig. 1 is the mapping graph of 15 switching voltage vectors to 12 switching voltage vectors；
Fig. 2 is equivalent voltage space vector plane when corresponding 12 switching vector selector in exchange end is misaligned above and below the present invention
Figure；
Fig. 3 exchanges equivalent voltage space vector plane figure when corresponding 12 switching vector selector in end overlaps for the present invention up and down.
Embodiment
The space vector modulating method of 15 switch converters of the present invention is illustrated with reference to attached drawing.
The space vector modulating method of 15 switch converters of the present invention includes the following steps：
1. 15 switch converters voltage vector-diagrams can be mapped as two 12 switch converters voltage vector-diagrams, will be upper
Exchange end reference voltage vector exchanges end reference voltage vector with and is mapped in two 12 switch converters voltage vectors respectively
Figure.15 switching vector selectors can be equivalent to exchange end reference voltage vector and end reference voltage vector addition is exchanged with, will be upper
Exchange end reference voltage vector is mapped to a 12 switching voltage polar plots, similarly by lower exchange end reference voltage vector mapping
To another 12 switching voltage polar plot.
2. 12 switch converters voltages effect vector is selected on 12 switching vector selector figures and determines voltage vector effect
Time, 12 obtained switch converters voltages effect vector is mapped to from 12 switch converters voltage space vector planes
15 switch converters voltage vector space planes, while 12 switch converters voltage vector action times were converted to 15
Switch converters voltage vector action time.Exchange terminal voltage vector corresponds to three respectively up and down in 12 switching voltage polar plots
A 12 switch converters voltage vector and corresponding voltage vector action time is can obtain, analyzed corresponding to exchange end up and down
12 switch converters voltage vectors with the presence or absence of overlap：If not overlapping, judge that each 12 switching voltage vector belongs to
Small vector, middle vector, big vector which kind of, secondly according to mapping condition each 12 switching voltage vector can be mapped as two
A 15 switching voltage vector, and 12 switch converters voltage vector action times were converted to 15 switch converters voltages
Vector action time；Overlapped if existing, the vector action time that this identical vector is corresponded to by comparing load end up and down determines phase
Corresponding 15 switching vector selector, and by 12 switching voltage vector action times conversion for 15 switching voltage vectors effect when
Between.
What the space vector modulating method of 15 switch converters of the present invention was realized in：
In 15 switch converters topological diagrams, DC bus-bar voltage Vdc, three bridge arms are shared, are respectively bridge arm A, bridge
Arm B and bridge arm C, each bridge arm may have four kinds of states.
1. 64 nine switch converters space vector of voltage can be obtained by 15 switching converter topologies of NPC, 15 are opened
Converter voltage vector is closed to be equivalent to exchange terminal voltage vector addition under exchange terminal voltage vector sum, therefore 15 switch converters
Voltage vector-diagram can be mapped as two 12 switch converters voltage vector-diagrams, as shown in Figure 1.
2. the vector in 12 switch converters polar plots is numbered, you can obtain 15 switching vector selectors and exchanged with
Reference voltage vector, the mapping relations of lower exchange end reference voltage vector are held, it is as shown in the table, and also available 15 switch
Converter voltage vector and 12 switch converters voltage vector contrast relationships.
3. corresponding 12 switch converters of exchange end vector up and down are determined in 12 switch converters polar plots
Voltage acts on vector and voltage vector action time, according to 12 switch converters voltage vectors corresponding to upper and lower exchange end
Analyzed with the presence or absence of coincidence：
(1) if 12 switch converters voltage vectors corresponding to exchange end determine each 12 there is no overlapping up and down
The affiliated small vector of switch converters voltage vector, middle vector, big vector which kind of, corresponding 2 are then determined according to respective rule
A 15 switch converters vector, and two 15 switching vector selector action time phases that each 12 switch converters determine
Deng being the 1/2 of 12 corresponding switching vector selector action times.
(2) if 12 switch converters voltage vectors corresponding to exchange end determine what is overlapped there are coincidence situation up and down
12 switch converters voltage vectors, and phase is determined according to the vector action time that the upper and lower load end of comparison corresponds to this identical vector
Corresponding 15 switching vector selector, and by 12 switching voltage vector action times conversion for 15 switching voltage vectors effect when
Between；Remaining is not present the 12 switch converters voltage vectors overlapped to determine 15 switch change-over of mapped according to step (1)
Device voltage vector and corresponding vector action time.
Analyzed 4. giving an actual example below：
(1) as shown in Fig. 2, upper exchange terminal voltage vector is in III-B, three 12 switch change-overs corresponding to it can be obtained
Device voltage vector is VH4、VH5、VH13, and corresponding voltage vector action time is TH4、TH5、TH13；Lower exchange terminal voltage vector
In I-D, the three 12 switch converters voltage vectors that can be obtained corresponding to it are VL3、VL6、VL11, and corresponding voltage is sweared
Amount action time is TL3、TL6、TL11.It can thus be concluded that 12 switch converters voltage vectors corresponding to exchange end are not present up and down
Overlap.
V in this 6 12 switch converters voltage vectors can be obtained by 12 switch converters polar plots in Fig. 2H4、VH5、
VL3For small vector, VH13、TL11For middle vector, VL6For big vector, because small vector is represented by the 1/ of the identical big vector of direction vector
2 (such as V4=V8/ 2), middle vector is half (such as V for being expressed as adjacent big vector addition11=(V6+V2)/2), you can determine VH4It is right
The 15 switch converters voltage vectors answered are V8,19And V0,19, and the two 15 switch converters voltage vector action times
For TH4/2；VH5Corresponding 15 switch converters voltage vector is V10,19And V0,19, and the two 15 switch converters voltages
Vector action time is TH5/2；VH13Corresponding 15 switch converters vector is V10,19And V8,19, and the two 15 switches become
Parallel operation voltage vector action time is TH13/2；VL3Corresponding 15 switch converters voltage vector is V0,6And V0,19, and this two
A 15 switch converters voltage vector action time is TL3/2；VL6Corresponding 15 switch converters voltage vector is V0,6With
V0,6, and the two 15 switch converters voltage vector action times are TL6/2；VL11Corresponding 15 switch converters voltage
Vector is V0,6And V0,2, and the two 15 switch converters voltage vector action times are TL11/2。
The 12 15 switch converters voltage vectors finally obtained are V8,19、V0,19、V10,19、V0,19、V10,19、V8,19、
V0,6、V0,19、V0,6、V0,6、V0,6And V0,2, and corresponding voltage vector action time is TH4/2、TH4/2、TH5/2、TH5/2、
TH13/2、TH13/2、TL3/2、TL3/2、TL6/2、TL6/2、TL11/ 2 and TL11/2。
(2) as shown in figure 3, upper exchange terminal voltage vector is in I-D, three 12 switch converters corresponding to it can be obtained
Voltage vector is VH3、VH6、VH11, and corresponding voltage vector action time is TH3、TH6、TH11；At lower exchange terminal voltage vector
In I-B, the three 12 switch converters voltage vectors that can be obtained corresponding to it are VL1、VL2、VL11, and corresponding voltage vector
Action time is TL1、TL2、TL11.It can thus be concluded that VH11=VL11=V11, i.e., 12 switch converters corresponding to end are exchanged up and down
Voltage vector, which exists, to be overlapped, analysis first analyzes V there is no 4 12 switch converters voltage vectors of coincidence situationH3、
VH6、VL1And VL2To the mapping of 15 switching vector selector figures, and the conversion of voltage vector action time：VH3Corresponding 15 switch
Converter voltage vector is V6,19And V0,19, and the two 15 switch converters voltage vector action times are TH3/2；VH6It is right
The 15 switch converters voltage vectors answered are V6,19And V6,19, and the two 15 switch converters voltage vector action times
For TH6/2；VL1Corresponding 15 switch converters voltage vector is V0,2And V0,19, and the two 15 switch converters voltages are sweared
Amount action time is TL1/2；VL2Corresponding 15 switch converters voltage vector is V0,2And V0,2, and the two 15 switches become
Parallel operation voltage vector action time is TL2/2。
Secondly, according to TH11With TL11Size judges to carry out next step concrete analysis:
If 1. TH11>TL11, map and obtain first group of 15 switch converters voltage vector V11,11And V0,19, its is corresponding
Voltage vector action time is TL11；And because of V11For middle vector, vector V two big is represented by6And V2It is added multiplied by 1/2, i.e.,
It can map to obtain second group of 15 switch converters voltage vector V6,19And V2,19, its corresponding voltage vector action time is equal
For (TH11-TL11)/2；The 12 15 switch converters voltage vectors then finally obtained are V6,19、V0,19、V6,19、V6,19、V0,2、
V0,19、V0,2、V0,2、V11,11、V0,19、V6,19And V2,19, and corresponding voltage vector action time is TH3/2、TH3/2、TH6/2、
TH6/2、TL1/2、TL1/2、TL2/2、TL2/2、TL11、TL11、(TH11-TL11)/2 and (TH11-TL11)/2。
If 2. TH11<TL11, map and obtain first group of 15 switch converters voltage vector V11,11And V0,19, its is corresponding
Voltage vector action time is TH11；And because of V11For middle vector, vector V two big is represented by6And V2It is added multiplied by 1/2, i.e.,
It can map to obtain second group of 15 switch converters voltage vector V0,6And V0,2, its corresponding voltage vector action time is
(TL11-TH11)/2；The 12 15 switch converters voltage vectors then finally obtained are V6,19、V0,19、V6,19、V6,19、V0,2、
V0,19、V0,2、V0,2、V11,11、V0,19、V0,6And V0,2, and corresponding voltage vector action time is TH3/2、TH3/2、TH6/2、
TH6/2、TL1/2、TL1/2、TL2/2、TL2/2、TH11、TH11、(TL11-TH11)/2 and (TL11-TH11)/2。
If 3. TH11=TL11, map and obtain first group of 15 switch converters voltage vector V11,11And V0,19, its is corresponding
Voltage vector action time be TH11/ 2 (or it is expressed as TL11/2)；Mapping obtains second group of 15 switch converters voltage arrow
Measure V11,11And V0,19, its corresponding voltage vector action time is TL11/ 2 (or it is expressed as TH11/2)；Then finally obtain
12 15 switch converters voltage vectors are V6,19、V0,19、V6,19、V6,19、V0,2、V0,19、V0,2、V0,2、V11,11、V0,19、
V11,11And V0,19, and corresponding voltage vector action time is TH3/2、TH3/2、TH6/2、TH6/2、TL1/2、TL1/2、TL2/2、
TL2/2、TL11/2、TL11/2、TH11/ 2 and TH11/2。
In conclusion no matter up and down 12 switch converters voltage vectors corresponding to exchange end are with the presence or absence of overlapping,
It can obtain 12 15 switch converters voltage vectors and corresponding 12 voltage vector action time.
5. during according to obtaining 15 switch converters voltage vectors and the effect of corresponding 15 switch converters voltage vector
Between the vector order formulated by the minimum principle of variable condition carry out vector selection；To corresponding to each bridge arm of 15 switch converters
On off state carry out decoding so as to finally obtain 15 switch converters switching devices drive waveforms.
Claims (3)
1. a kind of space vector modulating method of 15 switch converters, it is characterized in that：This method comprises the following steps：
1. 15 switch converters voltage vector-diagrams can be mapped as two 12 switch converters voltage vector-diagrams, by upper exchange
End reference voltage vector exchanges end reference voltage vector with and is mapped in two 12 switch converters voltage vector-diagrams respectively；
2. 12 switch converters voltages effect vector is selected on 12 switching vector selector figures and determines voltage vector action time,
12 obtained switch converters voltages effect vector is mapped to 15 from 12 switch converters voltage space vector planes
Switch converters voltage vector space plane, while 12 switch converters voltage vector action times were converted to 15 switches
Converter voltage vector action time.
2. 15 switch converters voltage space vector modulation method according to claim 1, it is characterized in that：The step
1. specific method be：15 switching vector selectors can be equivalent to exchange end reference voltage vector and end reference voltage arrow is exchanged with
Amount is added, and upper exchange end reference voltage vector is mapped to a 12 switching voltage polar plots, similarly by the reference of lower exchange end
Voltage vector is mapped to another 12 switching voltage polar plot.
3. 15 switch converters voltage space vector modulation method according to claim 1, it is characterized in that：The step
2. specific method be：Exchange terminal voltage vector corresponds to three 12 switch changes respectively up and down in 12 switching voltage polar plots
Parallel operation voltage vector and corresponding voltage vector action time is can obtain, analyze 12 switches up and down corresponding to exchange end and become
Parallel operation voltage vector is with the presence or absence of coincidence：If not overlapping, judge that each 12 switching voltage vector belongs to small vector, middle arrow
Amount, big vector which kind of, secondly according to mapping condition each 12 switching voltage vector can be mapped as two 15 switch
Voltage vector, and by 12 switch converters voltage vector action times be converted to 15 switch converters voltage vectors effect when
Between；Overlapped if existing, the vector action time that this identical vector is corresponded to by comparing load end up and down determines corresponding 15
Switching vector selector, and be 15 switching voltage vector action times by the conversion of 12 switching voltage vector action times.
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|---|---|---|---|---|
| US7310254B2 (en) * | 2006-02-15 | 2007-12-18 | Rockwell Automation Technologies, Inc. | AC-to-AC (frequency) converter with three switches per leg |
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| CN105356777A (en) * | 2015-12-01 | 2016-02-24 | 天津城建大学 | NPC three electric level 15 switch converter control system and control method |
| CN205142043U (en) * | 2015-12-01 | 2016-04-06 | 天津城建大学 | Control system of three level of NPC, 15 switch converters |
| CN105703647A (en) * | 2014-11-27 | 2016-06-22 | 天津城建大学 | Three-level clamping type three-leg 15-switch converter topology structure |
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2017
- 2017-12-11 CN CN201711309801.6A patent/CN107919808A/en active Pending
Patent Citations (5)
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|---|---|---|---|---|
| US7310254B2 (en) * | 2006-02-15 | 2007-12-18 | Rockwell Automation Technologies, Inc. | AC-to-AC (frequency) converter with three switches per leg |
| CN103269178A (en) * | 2013-05-06 | 2013-08-28 | 南京航空航天大学 | Single-stage type isolated type three-phase two-way AC/DC converter and control method thereof |
| CN105703647A (en) * | 2014-11-27 | 2016-06-22 | 天津城建大学 | Three-level clamping type three-leg 15-switch converter topology structure |
| CN105356777A (en) * | 2015-12-01 | 2016-02-24 | 天津城建大学 | NPC three electric level 15 switch converter control system and control method |
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