CN106849709B - The space vector width pulse modulation method and system of unidirectional three-level rectifier - Google Patents
The space vector width pulse modulation method and system of unidirectional three-level rectifier Download PDFInfo
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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
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc 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
- H02M7/217—Conversion of ac power input into dc 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
- H02M7/219—Conversion of ac power input into dc 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 in a bridge configuration
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Abstract
The present invention provides the space vector width pulse modulation method and system of a kind of unidirectional three-level rectifier, the phase angle of unidirectional three-level rectifier three-phase input voltage is obtained by phaselocked loop, identify big sector locating for phase angle, carry out dq- α β transformation, obtain the vector correction amount of big sector locating for phase angle, calculate the corresponding small two level vector of sector in phase angle, according to control time and output voltage, two level vector of the vector correction amount of big sector and small sector locating for phase angle, obtain phase angle two level vector service time in corresponding small sector, and allocation table is switched according to presetting in unidirectional three-level rectifier, two level vector service times were distributed into unidirectional three-level rectifier and switch corresponding bridge arm.In whole process, big interval judgement is carried out by phaselocked loop, obtained judgement section accurate stable, phaselocked loop itself has the function of anti-harmonic pollution and three-phase imbalance, the interference directly judged using input sample voltage is excluded, so that input current is more smooth, sinusoidalization.
Description
Technical field
The present invention relates to rectifier modulation technical fields, more particularly to the space vector pulse width of unidirectional three-level rectifier
Modulate (Space Vector Pulse Width Modulation, SVPWM) method and system.
Background technique
With the progress of power electronic technique, the requirement to power quality is higher and higher.But it can not be kept away in industrial products
Exempt from using nonlinear load is arrived, so that the problems such as causing distortion, harmonic pollution, imbalance to network voltage is also concerned.It is whole
Device is flowed as the indispensable link of variable-frequency power sources, and net side input current can be made to keep sineization, reduce power grid pollution
Dye.SVPWM is exactly to control the optimal selection mode for realizing input current sine.
SVPWM obtains complexity height, needs the processor of higher-end to be just able to satisfy demand for control practical application.In addition,
Due to unidirectional three-level rectifier topology energy can only one-way flow, actual product application in SVPWM toning can often occur
Phenomenon processed, when this also brings no-load current very little, output voltage is difficult to stable, discontinuous current problem.Therefore, SVPWM is modulated
Mode is an important component of unidirectional three-level rectifier control.
Technical staff proposes that SVPWM acquisition modes include: 90 ° of coordinate system acquisition modes, 60 ° of coordinate system acquisition sides at present
Formula, virtual coordinate system acquisition modes are reduced to two level acquisition modes etc..Although these modes can realize list to a certain extent
To the space vector pulse width modulation of three-level rectifier, but entire modulated process is excessively complicated and modulation result is not accurate enough.
Summary of the invention
Based on this, it is necessary to complicated for the space vector pulse width modulation of traditional unidirectional three-level rectifier and inaccuracy
Problem provides the space vector width pulse modulation method and system of the accurate unidirectional three-level rectifier of a kind of simple and modulation.
A kind of space vector width pulse modulation method of unidirectional three-level rectifier, comprising steps of
The phase angle of unidirectional three-level rectifier three-phase input voltage is obtained by phaselocked loop；
Identify that big sector locating for phase angle, big sector are to divide since default initial angle to preset every N angular interval
For M sectors, wherein M=360/N, N and M are positive integer；
Dq- α β transformation is carried out to phase angle, obtains the corresponding vector correction amount in big sector locating for phase angle；
It identifies small sector locating in big sector locating for phase angle, is recorded as the small sector of target, it is big according to locating for phase angle
The corresponding vector correction amount in sector, obtains the corresponding two level vector in the small sector of target, small sector be in single sector greatly with
The sector that every n angle interval division is m is preset, wherein m=N/n, m and n are positive integer；
Control time and the output voltage for obtaining unidirectional three-level rectifier, according to control time and output voltage, phase
The corresponding two level vector of the big corresponding vector correction amount in sector and small sector locating for angle obtains phase angle in corresponding small fan
Two level vector service time in area；
Allocation table is switched according to presetting in unidirectional three-level rectifier, two level are sweared in corresponding small sector by phase angle
Amount service time, which distributes into unidirectional three-level rectifier, switchs corresponding bridge arm.
A kind of space vector pulse width modulation system of unidirectional three-level rectifier, comprising:
Phase angle obtains module, for obtaining the phase of unidirectional three-level rectifier three-phase input voltage by phaselocked loop
Angle；
First identification module, big sector locating for phase angle, big sector are since default initial angle, with pre- for identification
If every N angular interval is divided into M sectors, wherein M=360/N, N and M are positive integer；
Conversion module obtains the corresponding vector correction in big sector locating for phase angle for carrying out dq- α β transformation to phase angle
Amount；
Second identification module, small sector locating in big sector locating for phase angle, is recorded as the small sector of target for identification,
The corresponding vector correction amount in the big sector according to locating for phase angle obtains the corresponding two level vector in the small sector of target, and small sector is
To preset the sector that every n angle interval division is m in single big sector, wherein m=N/n, m and n are positive integer；
Time computing module, for obtaining control time and the output voltage of unidirectional three-level rectifier, when according to control
Between with the corresponding two level vector of the corresponding vector correction amount in big sector and small sector locating for output voltage, phase angle, obtain
Phase angle two level vector service time in corresponding small sector；
Distribution module is preset in unidirectional three-level rectifier for basis and switchs allocation table, by phase angle corresponding small
Two level vector service times, which distributed into unidirectional three-level rectifier, in sector switchs corresponding bridge arm.
The space vector width pulse modulation method and system of the unidirectional three-level rectifier of the present invention are obtained unidirectional by phaselocked loop
The phase angle of three-level rectifier three-phase input voltage identifies big sector locating for phase angle, carries out dq- α β transformation, obtains phase
The vector correction amount of big sector locating for angle calculates the corresponding small two level vector of sector in phase angle, according to control time and output
Two level vector of the vector correction amount of big sector and small sector locating for voltage, phase angle obtains phase angle in corresponding small fan
Two level vector service times in area, and allocation table is switched according to presetting in unidirectional three-level rectifier, two level vectors are opened
The logical time, which distributes into unidirectional three-level rectifier, switchs corresponding bridge arm.In whole process, big section is carried out by phaselocked loop
Judgement, obtained judgement section accurate stable, phaselocked loop itself have the function of anti-harmonic pollution and three-phase imbalance, exclude direct
The interference judged using input sample voltage, so that input current is more smooth, sinusoidalization.
Detailed description of the invention
Fig. 1 is that the process of space vector width pulse modulation method one embodiment of the unidirectional three-level rectifier of the present invention is shown
It is intended to；
Fig. 2 is that big sector and small sector divide schematic diagram；
Fig. 3 is that the process of second embodiment of space vector width pulse modulation method of the unidirectional three-level rectifier of the present invention is shown
It is intended to；
Fig. 4 is the place using space vector width pulse modulation method one embodiment of the unidirectional three-level rectifier of the present invention
Manage flow diagram；
Fig. 5 is that the structure of space vector pulse width modulation system one embodiment of the unidirectional three-level rectifier of the present invention is shown
It is intended to；
Fig. 6 is that the structure of second embodiment of space vector pulse width modulation system of the unidirectional three-level rectifier of the present invention is shown
It is intended to.
Specific embodiment
As shown in Figure 1, a kind of space vector width pulse modulation method of unidirectional three-level rectifier, comprising steps of
S100: the phase angle of unidirectional three-level rectifier three-phase input voltage is obtained by phaselocked loop.
Phaselocked loop (phase locked loop, PLL), refers to the loop of locking phase.This is a kind of typical feedback control
Circuit processed realizes output signal frequency using the frequency and phase of externally input reference signal control loop internal oscillation signal
Rate automatically tracks frequency input signal.The phase of unidirectional three-level rectifier three-phase input voltage is obtained using phaselocked loop
Angle.Specifically, the three-phase input end of unidirectional three-level rectifier can be connect with phaselocked loop in practical applications, thus logical
Cross the phase angle that phaselocked loop obtains unidirectional three-level rectifier three-phase input voltage.It more specifically, is using DSOGI-PLL
(software phase-lock loops of double broad sense second-order integrators) algorithm, obtains unidirectional three-level rectifier three-phase input voltage by phaselocked loop
Phase angle, in this way even if in the larger harmonic wave of power grid and three-phase imbalance can correct locking phase, thus
Steadily and accurately obtain the phase angle of unidirectional three-level rectifier three-phase input voltage.
S200: big sector locating for identification phase angle, big sector are since default initial angle, to preset every angular area N
Between be divided into the sector of M, wherein M=360/N, N and M are positive integer.
The variation range at phase angle is 0~360 degree (or perhaps 0~180 degree and -180~0 degree), for 360 degree
Constant interval is waited N angular interval to be divided into M sector, specifically may refer to Fig. 2, for ease of understanding feelings shown in Fig. 2
Condition be divided into 6 big sectors, every big sector angular constant interval be 60 degree.It the phase angle that step S100 is obtained can be possible
Any one big sector in M big sector, identifies big sector locating for current phase angle.
S300: dq- α β transformation is carried out to phase angle, obtains the corresponding vector correction amount in big sector locating for phase angle.
Dq- α β transformation is carried out to phase angle, obtains the corresponding sector vector correction amount in big sector locating for phase angle.It is specific next
It says, the formula of dq- α β transformation are as follows:
After carrying out dq- α β transformation transformation, there are corresponding vector correction amount, the arrow in each big sector in M big sector
Amount correction amount can be precalculated.For there is the case where 6 big sectors, the corresponding vector correction amount in each of which big sector
Table 1 specific as follows.
1 sector vector correction table of table
In table 1, UdcFor to the output voltage of three-level rectifier.
S400: in big sector locating for identification phase angle locating small sector, the small sector of target is recorded as, according to phase angle institute
Locate the corresponding vector correction amount in big sector, obtain the corresponding two level vector in the small sector of target, small sector is in single big sector
In to preset the sector that every n angle interval division is m, wherein m=N/n, m and n are positive integer.
Secondary sector division is carried out to big sector, is m small sectors by the n angles interval division such as big sector, wherein m=
N/n, m and n are positive integer.Specifically can be with continued reference to Fig. 2, No. I big sector is divided into 6 small sectors, Mei Ge little in Fig. 2
Sector corresponding angle section is 10 degree.Specifically, the purpose for carrying out secondary sector division is: big sector vector correction amount is three
Level space vector region is multiple (shown in Fig. 2 is 6) two level spaces arrow the 3 level space vector Region Decomposition
Region is measured, each small sector vector is corresponding two level area center vectors.It can be used for the identification process of the small sector of target
Identification method one by one is identified one by one for each small sector in big sector locating for phase angle.Its specific identification process can
Software realization in a manner of using following software codes.
In above-mentioned software code, a, b, c are respectively unidirectional three-level rectifier three-phase voltage value, and i is small sector number,
VαWith VβFor the corresponding vector correction amount in big sector locating for phase angle.
S500: obtaining control time and the output voltage of unidirectional three-level rectifier, according to control the time and output voltage,
The corresponding two level vector of the big corresponding vector correction amount in sector and small sector locating for phase angle obtains phase angle corresponding
Two level vector service time in small sector.
The space vector pulse width modulation demand of this basic unidirectional three-level rectifier, carries out unidirectional three-level rectifier
Parameter acquisition can be obtained the control time T of unidirectional three-level rectifiersWith output voltage Udc.Again based on before having obtained
The corresponding two level vector of the big corresponding vector correction amount in sector and small sector locating for phase angle obtains phase angle corresponding
Two level vector service time T in small sectoriAnd Tj。
Step S500 is specifically included in one of the embodiments:
Step 1: using bridge arm time calculation formula, is fanned greatly according to the control time with locating for output voltage and phase angle
The corresponding vector correction amount in area, calculates service time of the unidirectional three-level rectifier on X, Y and Z, and X, Y and Z are space
Three-dimensional coordinate axis direction.
According to control time vector correction amount corresponding with big sector locating for output voltage and phase angle, unidirectional three are calculated
Level rectifier entirety service time, service time are for the service time on X, Y and Z.Specifically, when bridge arm
Between calculation formula it is as follows:
In formula, VαWith VβFor the corresponding vector correction amount in big sector, U locating for phase angledcFor unidirectional three-level rectifier
Output voltage, TsFor the control time of unidirectional three-level rectifier.
Step 2: deriving according to the calculating of two level vector spaces, determines two level vectors and list in each small sector
To the corresponding relationship of service time of the three-level rectifier on X, Y and Z, by unidirectional three-level rectifier on X, Y and Z
Service time selectivity assignment to small sector on two level vectors, obtain phase angle two level in corresponding small sector
Vector service time.
It is derived according to the calculating of two level vector spaces before, in the small sector of acquisition after two level vectors, is determined small
The corresponding relationship of two level vectors and service time of the unidirectional three-level rectifier on X, Y and Z in sector, and will be unidirectional
It is final to obtain in the assignment to small sector of service time selectivity of the three-level rectifier on X, Y and Z on two level vectors
Phase angle two level vector service time in corresponding small sector.Specifically, two level vector service time in small sector
TiAnd TjIt is as shown in table 2 below with relationship of the unidirectional three-level rectifier between the service time on X, Y and Z.
Two level vector service time T in the small sector of table 2iAnd TjWith unidirectional three-level rectifier opening on X, Y and Z
Relationship between the logical time
| Small sector number | 1 | 2 | 3 | 4 | 5 | 6 |
| Ti | -Z | Z | X | -X | -Y | Y |
| Tj | X | Y | -Y | Z | -Z | -X |
It is non-essential, as shown in figure 3, in one of the embodiments, after step S500 further include:
S520: to phase angle, two level vector service times carried out toning processing in corresponding small sector, obtained toning
Treated service time.
Only when the sum of first time and the second time being greater than the control time, when just may require that first time and second
Between numerical value be updated, when the sum of first time and the second time are no more than the control time, keep at the first time and when second
Between it is constant.To step S500 obtain phase angle in the small sector of correspondence two level vector service time TiAnd TjIt mediated
Reason is able to solve SVPWM unloaded output voltage stabilization problem in unidirectional three-level rectifier topology.Specifically, it crosses and mediates
Reason is using if-than toning processing mode.
In one of the embodiments, phase angle in corresponding small sector two level vector service times include first when
Between and the second time, to phase angle in corresponding small sector two level vector service times carry out toning processing, obtain toning
The step of treated service time includes:
Step 1: when the sum of first time and the second time be greater than the control time, is greater than the second time and the at the first time
When one time was greater than the control time, it is updated to the control time at the first time, the second time was updated to zero.
Step 2: when the sum of first time and the second time be greater than the control time, is greater than the second time and the at the first time
Constant at the first time when one time is no more than the control time, the second time was updated to the difference of control time and first time.
It should be pointed out that in above-mentioned steps, with the second time it is at the first time relative concept and nisi sense
It at the first time can be T when reading, such as being combined with examples detailed aboveiIt or is Tj, the second time can be TiIt or is Tj, when first
Time is TiWhen, the second time was Tj；It in turn, is T when first timejWhen, the second time was Ti。
For the process for further explaining in detail above-mentioned toning processing, software-programming languages mode table will be equally used below
Levy the process of above-mentioned toning processing.
S600: switching allocation table according to presetting in unidirectional three-level rectifier, by phase angle two in corresponding small sector
Level vector service time, which distributes into unidirectional three-level rectifier, switchs corresponding bridge arm.
Switch allocation table is derived in advance based on unidirectional three-level rectifier overall condition in unidirectional three-level rectifier
Switch allocation table out, by phase angle that step S500 is obtained, two level vector service times were assigned in corresponding small sector
Corresponding bridge arm is switched in unidirectional three-level rectifier.Specifically, when needing to phase angle two electricity in corresponding small sector
When flat vector carries out toning processing, step S600 specifically: allocation table is switched according to presetting in unidirectional three-level rectifier, incited somebody to action
The service time for mediating reason, which distributes into unidirectional three-level rectifier, switchs corresponding bridge arm.More specifically, phase angle exists
Two level vector service times and switch time corresponding relationship such as following formula in unidirectional three-level rectifier in corresponding small sector:
In formula, Ta、Tb、TcIt respectively refers in the single bridge arm of unidirectional three-level rectifier three and opens the corresponding time.
The space vector width pulse modulation method of the unidirectional three-level rectifier of the present invention obtains unidirectional three level by phaselocked loop
The phase angle of rectifier three-phase input voltage identifies big sector locating for phase angle, carries out dq- α β transformation, obtains locating for phase angle
The vector correction amount of big sector calculates the corresponding small two level vector of sector in phase angle, according to control time and output voltage, phase
Two level vector of the vector correction amount of big sector and small sector locating for parallactic angle obtains phase angle two electricity in corresponding small sector
Flat vector service time, and allocation table is switched according to presetting in unidirectional three-level rectifier, by two level vector service times point
It is assigned in unidirectional three-level rectifier and switchs corresponding bridge arm.In whole process, big interval judgement is carried out by phaselocked loop, is obtained
Judgement section accurate stable, phaselocked loop itself has the function of anti-harmonic pollution and three-phase imbalance, excludes directly using inputting
The interference that sampled voltage is judged, so that input current is more smooth, sinusoidalization.
As shown in figure 4, the entire process flow of space vector width pulse modulation method of the unidirectional three-level rectifier of the present invention are as follows:
1, the voltage of unidirectional three-level rectifier three-phase input is passed through into PLL, acquisition phase angle.
2, big sector judgement is carried out to phase angle and dq- α β transformation is carried out to phase angle, obtained and fanned greatly locating for phase angle
The corresponding vector correction amount V in areaαWith Vβ。
3, the identification of small sector n in big sector N is carried out, and calculates small sector bridge arm action time, is i.e. calculating phase angle
The two level vector service time T in corresponding small sectoriAnd Tj。
4, to phase angle in corresponding small sector two level vector service time TiAnd TjToning processing is carried out, according to pre-
The time allocation table first derived, using big sector N and small sector n by Ta、Tb、TcDistribute to corresponding bridge arm switch.
As shown in figure 5, a kind of space vector pulse width modulation system of unidirectional three-level rectifier, comprising:
Phase angle obtains module 100, for obtaining the phase of unidirectional three-level rectifier three-phase input voltage by phaselocked loop
Parallactic angle.
First identification module 200, big sector locating for phase angle for identification, big sector be since default initial angle,
To preset the sector that every N angular interval is divided into M, wherein M=360/N, N and M are positive integer.
Conversion module 300 obtains the corresponding vector in big sector locating for phase angle for carrying out dq- α β transformation to phase angle
Correction amount.
Second identification module 400, small sector locating in big sector locating for phase angle, is recorded as the small fan of target for identification
Area, the corresponding vector correction amount in the big sector according to locating for phase angle obtain the corresponding two level vector in the small sector of target, small sector
For, to preset the sector that every n angle interval division is m, wherein m=N/n, m and n are positive integer in single big sector..
Time computing module 500, for obtaining control time and the output voltage of unidirectional three-level rectifier, according to control
Time and the corresponding two level vector of the corresponding vector correction amount in big sector and small sector locating for output voltage, phase angle, are obtained
Take phase angle two level vector service time in corresponding small sector.
Distribution module 600 is preset in unidirectional three-level rectifier for basis and switchs allocation table, by phase angle corresponding
Two level vector service times, which distributed into unidirectional three-level rectifier, in small sector switchs corresponding bridge arm.
The space vector pulse width modulation system of the unidirectional three-level rectifier of the present invention, phase angle obtain module 100 and pass through lock
Phase ring obtains the phase angle of unidirectional three-level rectifier three-phase input voltage, and the first identification module 200 identifies big locating for phase angle
Sector, conversion module 300 carry out dq- α β transformation, obtain the vector correction amount of big sector locating for phase angle, the second identification module
400 calculate the corresponding small two level vector of sector in phase angle, and time computing module 500 is according to control time and output voltage, phase
Two level vector of the vector correction amount of big sector and small sector locating for parallactic angle obtains phase angle two electricity in corresponding small sector
Flat vector service time, distribution module 600 switch allocation table according to presetting in unidirectional three-level rectifier, two level vectors are opened
The logical time, which distributes into unidirectional three-level rectifier, switchs corresponding bridge arm.In whole process, big section is carried out by phaselocked loop
Judgement, obtained judgement section accurate stable, phaselocked loop itself have the function of anti-harmonic pollution and three-phase imbalance, exclude direct
The interference judged using input sample voltage, so that input current is more smooth, sinusoidalization.
Phase angle obtains module 100 and is also used to pass through locking phase using DSOGI-PLL algorithm in one of the embodiments,
Ring obtains the phase angle of unidirectional three-level rectifier three-phase input voltage.
Time computing module 500 includes: in one of the embodiments,
First time computing unit, for use bridge arm time calculation formula, according to control the time and output voltage and
The corresponding vector correction amount in big sector locating for phase angle, calculates service time of the unidirectional three-level rectifier on X, Y and Z,
X, Y and Z is 3 d space coordinate axis direction.
Second time calculating unit determines in each small sector for being derived according to the calculating of two level vector spaces
The corresponding relationship of two level vectors and service time of the unidirectional three-level rectifier on X, Y and Z, by unidirectional three level rectifying
In the assignment to small sector of service time selectivity of the device on X, Y and Z on two level vectors, phase angle is obtained corresponding
Two level vector service time in small sector.
Bridge arm time calculation formula specifically:
In formula, VαWith VβFor the corresponding vector correction amount in big sector, U locating for phase angledcFor unidirectional three-level rectifier
Output voltage, TsFor the control time of unidirectional three-level rectifier.
As shown in figure 5, the space vector pulse width modulation system of unidirectional three-level rectifier is also in one of the embodiments,
Include:
Toning processing module 520, for two level vector service times to carry out in corresponding small sector to phase angle
It mediates reason, obtains toning treated service time.
Distribution module 600 is also used to switch allocation table according to presetting in unidirectional three-level rectifier, by opening for toning processing
The logical time, which distributes into unidirectional three-level rectifier, switchs corresponding bridge arm.
In one of the embodiments, phase angle in corresponding small sector two level vector service times include first when
Between and the second time, toning processing module 520 includes:
First toning processing unit is used for when the sum of first time and second time are big greater than control time, first time
In the second time and when being greater than the control time at the first time, it is updated to the control time at the first time, the second time was updated to zero；
Second toning processing unit is used for when the sum of first time and second time are big greater than control time, first time
When in the second time and at the first time no more than the control time, constant at the first time, the second time was updated to the control time and the
The difference of one time.
Only several embodiments of the present invention are expressed for above embodiments, and the description thereof is more specific and detailed, but can not
Therefore it is construed as limiting the scope of the patent.It should be pointed out that for those of ordinary skill in the art,
Under the premise of not departing from present inventive concept, various modifications and improvements can be made, and these are all within the scope of protection of the present invention.
Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of space vector width pulse modulation method of unidirectional three-level rectifier, which is characterized in that comprising steps of
The phase angle of unidirectional three-level rectifier three-phase input voltage is obtained by phaselocked loop；
Identify that big sector locating for the phase angle, the big sector are since default initial angle, to preset every N angular interval
It is divided into M sectors, wherein M=360/N, N and M are positive integer；
Dq- α β transformation is carried out to the phase angle, obtains the corresponding vector correction amount in big sector locating for the phase angle；
It identifies small sector locating in big sector locating for the phase angle, the small sector of target is recorded as, according to the phase angle institute
Locate the corresponding vector correction amount in big sector, obtain the corresponding two level vector in the small sector of the target, the small sector is in list
To preset the sector that every n angle interval division is m in a big sector, wherein m=N/n, m and n are positive integer；
Control time and the output voltage for obtaining unidirectional three-level rectifier, according to the control time and output voltage, described
The big corresponding vector correction amount in sector and the corresponding two level vector in the small sector, obtain the phase angle locating for phase angle
The two level vector service time in corresponding small sector；
Allocation table is switched according to presetting in unidirectional three-level rectifier, two level are sweared in corresponding small sector by the phase angle
Amount service time, which distributes, switchs corresponding bridge arm into the unidirectional three-level rectifier.
2. the space vector width pulse modulation method of unidirectional three-level rectifier according to claim 1, which is characterized in that institute
Stating the step of obtaining the phase angle of unidirectional three-level rectifier three-phase input voltage by phaselocked loop includes:
Using DSOGI-PLL algorithm, the phase angle of unidirectional three-level rectifier three-phase input voltage is obtained by phaselocked loop.
3. the space vector width pulse modulation method of unidirectional three-level rectifier according to claim 1, which is characterized in that institute
It states according to the control time and the corresponding vector correction amount in big sector and the small fan locating for output voltage, the phase angle
The corresponding two level vector in area obtains phase angle packet the step of two level vector service times in corresponding small sector
It includes:
Using bridge arm time calculation formula, the big sector pair according to locating for the control time and output voltage and the phase angle
The vector correction amount answered, calculates service time of the unidirectional three-level rectifier on X, Y and Z, and described X, Y and Z are space
Three-dimensional coordinate axis direction；
It is derived according to the calculating of two level vector spaces, determines two level vectors and unidirectional three level in each small sector
The corresponding relationship of service time of the rectifier on X, Y and Z, by unidirectional three-level rectifier on X, Y and Z when opening
Between in selective assignment to the small sector on two level vectors, obtain the phase angle two level in corresponding small sector
Vector service time；
The bridge arm time calculation formula specifically:
In formula, VαWith VβFor the corresponding vector correction amount in big sector, U locating for the phase angledcFor the unidirectional three-level rectifier
Output voltage, TsFor the control time of the unidirectional three-level rectifier.
4. the space vector width pulse modulation method of unidirectional three-level rectifier according to claim 1, which is characterized in that
The control time for obtaining unidirectional three-level rectifier and output voltage, according to the control time and output voltage,
The big corresponding vector correction amount in sector and the corresponding two level vector in the small sector, obtain the phase locating for the phase angle
Parallactic angle in corresponding small sector the step of two level vector service times after further include:
To the phase angle, two level vector service times carried out toning processing in corresponding small sector, after obtaining toning processing
Service time；
The basis is preset in unidirectional three-level rectifier and switchs allocation table, by the phase angle in corresponding small sector two electricity
Flat vector service time distributes the step of switching corresponding bridge arm into the unidirectional three-level rectifier and includes:
Allocation table is switched according to presetting in unidirectional three-level rectifier, the service time that the toning is handled is distributed to the list
Corresponding bridge arm is switched into three-level rectifier.
5. the space vector width pulse modulation method of unidirectional three-level rectifier according to claim 4, which is characterized in that institute
State phase angle in corresponding small sector two level vector service times include at the first time and the second time, it is described to the phase
Parallactic angle two level vector service times in corresponding small sector carry out toning processing, obtain toning treated service time
Step includes:
When the sum of the first time and second time are greater than the control time, the first time is greater than described second
When time and the first time are greater than the control time, the first time is updated to the control time, and described second
Time is updated to zero；
When the sum of the first time and second time are greater than the control time, the first time is greater than described second
When time and the first time are not more than the control time, the first time is constant, and second time is updated to institute
State the difference of control time and the first time.
6. a kind of space vector pulse width modulation system of unidirectional three-level rectifier characterized by comprising
Phase angle obtains module, for obtaining the phase angle of unidirectional three-level rectifier three-phase input voltage by phaselocked loop；
First identification module, big sector locating for the phase angle for identification, the big sector be since default initial angle,
To preset the sector that every N angular interval is divided into M, wherein M=360/N, N and M are positive integer；
Conversion module obtains the corresponding vector in big sector locating for the phase angle for carrying out dq- α β transformation to the phase angle
Correction amount；
Second identification module, small sector locating in big sector locating for the phase angle, is recorded as the small sector of target for identification,
The corresponding vector correction amount in the big sector according to locating for the phase angle, obtains the corresponding two level vector in the small sector of the target,
The small sector is the wherein m=N/n to preset the sector that every n angle interval division is m in the single big sector, m and
N is positive integer；
Time computing module, for obtaining control time and the output voltage of unidirectional three-level rectifier, when according to the control
Between sweared with corresponding two level of the corresponding vector correction amount in big sector locating for output voltage, the phase angle and the small sector
Amount, obtains the phase angle two level vector service time in corresponding small sector；
Distribution module is preset in unidirectional three-level rectifier for basis and switchs allocation table, by the phase angle corresponding small
Two level vector service times, which distributed, in sector switchs corresponding bridge arm into the unidirectional three-level rectifier.
7. the space vector pulse width modulation system of unidirectional three-level rectifier according to claim 6, which is characterized in that institute
Phase angle acquisition module is stated to be also used to that it is defeated to obtain unidirectional three-level rectifier three-phase by phaselocked loop using DSOGI-PLL algorithm
Enter the phase angle of voltage.
8. the space vector pulse width modulation system of unidirectional three-level rectifier according to claim 6, which is characterized in that institute
Stating time computing module includes:
First time computing unit, for using bridge arm time calculation formula, according to the control time and output voltage and
The corresponding vector correction amount in big sector locating for the phase angle calculates unidirectional three-level rectifier on X, Y and Z when opening
Between, described X, Y and Z are 3 d space coordinate axis direction；
Second time calculating unit determines in each small sector for being derived according to the calculating of two level vector spaces
The corresponding relationship of two level vectors and service time of the unidirectional three-level rectifier on X, Y and Z, by unidirectional three level rectifying
In the assignment to the small sector of service time selectivity of the device on X, Y and Z on two level vectors, the phase angle is obtained
The two level vector service time in corresponding small sector；
The bridge arm time calculation formula specifically:
In formula, VαWith VβFor the corresponding vector correction amount in big sector, U locating for the phase angledcFor the unidirectional three-level rectifier
Output voltage, TsFor the control time of the unidirectional three-level rectifier.
9. the space vector pulse width modulation system of unidirectional three-level rectifier according to claim 6, which is characterized in that also
Include:
Toning processing module, for two level vector service times to mediate in corresponding small sector to the phase angle
Reason obtains toning treated service time；
The distribution module is also used to switch allocation table according to presetting in unidirectional three-level rectifier, opens what the toning was handled
The logical time, which distributes, switchs corresponding bridge arm into the unidirectional three-level rectifier.
10. the space vector pulse width modulation system of unidirectional three-level rectifier according to claim 9, which is characterized in that
The phase angle two level vector service times in corresponding small sector include mediating at the first time with the second time, the mistake
Managing module includes:
First toning processing unit, for being greater than the control time, institute when the sum of the first time and second time
It states at the first time greater than second time and when the first time is greater than the control time, the first time is updated to
The control time, second time are updated to zero；
Second toning processing unit, for being greater than the control time, institute when the sum of the first time and second time
It states at the first time greater than second time and when the first time is no more than the control time, the first time is not
Become, second time is updated to the difference of the control time and the first time.
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