CN108809136A - A kind of three-phase four-leg inverter Randomized Pulse Position 3D-SVPWM control systems and its method - Google Patents
A kind of three-phase four-leg inverter Randomized Pulse Position 3D-SVPWM control systems and its method Download PDFInfo
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- CN108809136A CN108809136A CN201810579699.XA CN201810579699A CN108809136A CN 108809136 A CN108809136 A CN 108809136A CN 201810579699 A CN201810579699 A CN 201810579699A CN 108809136 A CN108809136 A CN 108809136A
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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
- H02M7/53875—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 analogue control of three-phase output
-
- 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
- H02M7/53875—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 analogue control of three-phase output
- H02M7/53876—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 analogue control of three-phase output based on synthesising a desired voltage vector via the selection of appropriate fundamental voltage vectors, and corresponding dwelling times
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a kind of three-phase four-leg inverter Randomized Pulse Position 3D-SVPWM control systems and its methods, belong to power electronics field.The control system generates three-phase sine-wave using three phase sine wave producer and is transferred to 3D-SVPWM generators, vector action time module calculates the action time of operating voltage vector according to the random number that randomizer generates, switch motion time module calculates the actuation time of three-phase four-leg inverter or more switching tube according to the action time of gained and is transferred to 3D-SVPWM generators, 3D-SVPWM generators are according to the three-phase sine-wave received, the switch periods of vector action time and setting generate pwm control signal and are spread out of to the IGBT switching tubes of three-phase four-leg inverter topological structure by conducting wire.Higher hamonic wave at switching frequency can be distributed in a certain range by method disclosed by the invention in the case where not increasing THD, reduce the electromagnetic interference of system.
Description
Technical field
The invention belongs to power electronics field, more particularly to a kind of three-phase four-leg inverter Randomized Pulse Position
3D-SVPWM control systems and its method.
Background technology
With the fast development of power electronic technique, the application of various nonlinear loads is more and more common, usually requires that UPS
Or inverter has the ability powered to unbalanced and nonlinear load, at this moment traditional three-phase three-leg inverter just seems nothing
Can be power.Three-phase four-arm inversion topological is a kind of relatively more extensive inversion topological structure of Recent study, it can direct centering
Property electric current controlled, have many advantages, such as control flexibly, without big DC link capacitance.
Have many scholars both at home and abroad to study the modulation strategy of three-phase four-leg inverter, three-dimensional space vectors
Pulsewidth modulation (3D-SVPWM) strategy is due to having many advantages, such as that DC bus-bar voltage utilization rate is high and is widely used.However it uses
The inverter of the control strategy is usually operated under constant switching frequency so that occur at switching frequency integral multiple amplitude compared with
Big harmonic wave, it is very extensive to the harm of electric system：For system, these harmonic waves are main electromagnetic interference source, harmonic wave
The electromagnetic compatibility quality for reducing system, when serious even can in influence system other devices and equipment normal operation；In negative
For load, harmonic wave can cause undesirable loss, generate switching noise.The best mode for reducing switching noise radiation is to make inversion
The switching frequency of device reaches 18kHz or more, but this mode substantially increases the switching loss of inverter.
The solution of the present invention is the improvement carried out regarding to the issue above to existing three-phase four-leg inverter.
Invention content
In order to overcome deficiency in the prior art, the present invention to provide a kind of three-phase four-leg inverter Randomized Pulse Position
3D-SVPWM control systems and its method, harmonic problem caused by improve 3D-SVPWM modulation strategies will focus on switch frequency
Harmonic amplitude at rate integral multiple is evenly dispersed in entire frequency domain, can reduce harmonic wave under lower switching frequency
The ill effects such as caused noise.
In order to reach foregoing invention purpose, technical solution is as follows used by solving its technical problem：
The invention discloses a kind of three-phase four-leg inverter Randomized Pulse Position 3D-SVPWM control systems, including three-phase
Four-leg inverter, randomizer, vector action time module, switch motion time module, three phase sine wave producer
With 3D-SVPWM generators, wherein：
The three phase sine wave producer is connected with the 3D-SVPWM generators, for generate three-phase sine-wave and by
Wire transmission gives the 3D-SVPWM generators；
The randomizer is connected with the vector action time module, for being given birth to according to Generating Random Number
At four stochastic variables and it is transferred to the vector action time module；
The vector action time module is connected with the randomizer and switch motion time module respectively, uses
According to the action time of stochastic variable evaluation work voltage vector received and being transferred to the switch motion time module；
The switch motion time module is connected with the vector action time module and 3D-SVPWM generators respectively,
Actuation time for calculating three-phase four-leg inverter or more switching tube according to action time for receiving simultaneously is transferred to 3D-
SVPWM generators；
The 3D-SVPWM generators respectively with the three phase sine wave producer, switch motion time module and three-phase four
Leg inverter is connected, for being generated according to the switch periods of three-phase sine-wave, vector action time and the setting received
Pwm control signal is simultaneously spread out of by conducting wire to the IGBT switching tubes of the three-phase four-leg inverter topological structure.
In addition the present invention discloses a kind of three-phase four-leg inverter Randomized Pulse Position 3D-SVPWM control methods, including
Following steps：
Step 1：Build three-phase four-leg inverter Randomized Pulse Position 3D-SVPWM method control systems；
Step 2：Three phase sine wave producer generates three-phase sine-wave and is transferred to 3D-SVPWM generators；
Step 3：Randomizer generates four stochastic variable ξ according to Generating Random Number1、ξ2、ξ3、ξ4, and transmit
Give vector action time module；
Step 4：Vector action time module is according to the stochastic variable evaluation work voltage vector received in a triangle
Action time T in carrier cycle0, T1, T2, T3, and it is transferred to switch motion time module；
Step 5：Switch motion time module is according to the action time T received0, T1, T2, T3Calculate inverter a, b, c, f
The random variation range T of four bridge arm pulse positionsRND1、TRND2、TRND3、TRND4；
Step 6：3D-SVPWM wave producers are according to the tetra- bridge arm pulse positions of three-phase sine-wave, a, b, c, f received
Random variation range TRND1、TRND2、TRND3、TRND4And the switch periods T of settings, 3D-SVPWM waves are generated, and be transferred to
Three-phase four-leg inverter.
Further, in the step 3, the mathematical algorithm for generating random number is linear congruential method.
Further, the recurrence formula of the linear congruential method is：
Nj+1=(A × Nj+ B) (congruence M) (j=0,1,2......)
Wherein, NjFor j moment values, Nj+1For j+1 moment values, A, B, M is the parameter that designer voluntarily selects, it is desirable that is met
Following condition：
Condition 1：A, B are positive integers；
Condition 2：B, M are relatively prime；
Condition 3：If M is 4 multiple, A-1 is also；
Condition 4：The product aliquot A-1 of all prime factors of M；
Condition 5：A, B, N0 (Nj, j=0) are smaller than M.
The sequence N gone out according to the above theoretical calculationjIt is exactly stochastic variable ξ1、ξ2、ξ3、ξ4。
Further, in the step 3, four stochastic variable ξ1、ξ2、ξ3、ξ4Generation cycle phase it is same, and be switch
Cycle Ts。
Further, in the step 4, vector action time module is in evaluation work voltage vector in a triangular carrier
Action time T in period0, T1, T2And T3When obey voltage-second balance rule, i.e., as synthesized reference vector V*Operating voltage vector
For V0, V1, V2And V3When, meet：
Further, in the step 5, the random variation range T of tetra- bridge arm pulse positions of a, b, c, fRND1、TRND2、
TRND3、TRND4Can be in any position of corresponding modulating section under the premise of ensureing that the switching sequence of space vector modulation is constant
Arbitrary value.
Further, in each sampling period, the pulse position of each bridge arm PWM is determined by random number.
Further, the pulse position of each bridge arm changes at random in a switch periods.
Further, switch periods are fixed.
The present invention due to using the technology described above, is allowed to compared with prior art, have the following advantages that and actively imitate
Fruit：
A kind of three-phase four-leg inverter Randomized Pulse Position 3D-SVPWM control systems and its method proposed by the present invention
It can be in the case where not increasing THD (Total Harmonic Distortion total harmonic distortions), at switching frequency
Higher hamonic wave is distributed in a certain range, reduces the electromagnetic interference of system.3D-SVPWM modulation strategies are effectively improved to cause
Harmonic problem, the harmonic amplitude that will focus at switching frequency integral multiple is evenly dispersed in entire frequency domain, can
Reduce the ill effects such as noise caused by harmonic wave under lower switching frequency.
Description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Attached drawing be briefly described.It is clear that drawings in the following description are only some embodiments of the invention, for ability
For field technique personnel, without creative efforts, other drawings may also be obtained based on these drawings.It is attached
In figure：
Fig. 1 is the topological structure schematic diagram of three-phase four-leg inverter；
Fig. 2 is a kind of three-phase four-leg inverter Randomized Pulse Position 3D-SVPWM control system schematic diagrams of the present invention；
Fig. 3 is each bridge arm impulse waveform schematic diagram of modulation algorithm of the embodiment of the present invention；
Fig. 4 is present invention switch function schematic diagram of the example modulation algorithm in different switch periods in real time.
Specific implementation mode
Below with reference to the attached drawing of the present invention, technical solution in the embodiment of the present invention carries out clear, complete description
And discussion, it is clear that as described herein is only a part of example of the present invention, is not whole example, based on the present invention
In embodiment, the every other implementation that those of ordinary skill in the art are obtained without making creative work
Example, belongs to protection scope of the present invention.
Embodiment one
It is the topological structure schematic diagram of three-phase four-leg inverter as shown in Figure 1, which is in traditional three bridge of three-phase
The 4th phase bridge arm is added in arm inverter, and the midpoint of the bridge arm is connected with output loading, therefore, in must being flowed into load
Property point electric current.There is the topological structure higher redundancy, output voltage to have more independence, can fully achieve to the output phase
The decoupling control of voltage, even if inverter output connects asymmetrical three-phase, nonlinear load, which can obtain symmetrical three-phase
Output.In figure, each bridge arm is made of two IGBT and corresponding fly-wheel diode, pwm switching signal S1And S2、S3And S4、 S5
And S6、S7And S8It is mutual symmetry output, UdcFor DC bus-bar voltage, LnFor center line inductance.
Specifically as shown in Fig. 2, the invention discloses a kind of three-phase four-leg inverter Randomized Pulse Position 3D-SVPWM
Control system, including three-phase four-leg inverter, randomizer, vector action time module, switch motion time module,
Three phase sine wave producer and 3D-SVPWM generators, wherein：
The three phase sine wave producer is connected with the 3D-SVPWM generators, for generate three-phase sine-wave and by
Wire transmission gives the 3D-SVPWM generators；
The randomizer is connected with the vector action time module, for being given birth to according to Generating Random Number
At four stochastic variables and it is transferred to the vector action time module；
The vector action time module is connected with the randomizer and switch motion time module respectively, uses
According to the action time of stochastic variable evaluation work voltage vector received and being transferred to the switch motion time module；
The switch motion time module is connected with the vector action time module and 3D-SVPWM generators respectively,
Actuation time for calculating three-phase four-leg inverter or more switching tube according to action time for receiving simultaneously is transferred to 3D-
SVPWM generators；
The 3D-SVPWM generators respectively with the three phase sine wave producer, switch motion time module and three-phase four
Leg inverter is connected, for being generated according to the switch periods of three-phase sine-wave, vector action time and the setting received
Pwm control signal is simultaneously spread out of by conducting wire to the IGBT switching tubes of the three-phase four-leg inverter topological structure.
Embodiment two
In addition the present invention discloses a kind of three-phase four-leg inverter Randomized Pulse Position 3D-SVPWM control methods, including
Following steps：
Step 1：Build three-phase four-leg inverter Randomized Pulse Position 3D-SVPWM method control systems；
The control system includes three-phase four-leg inverter, randomizer, vector action time module, switch motion
Time module, three phase sine wave producer, 3D-SVPWM generators.Three phase sine wave producer generate first three-phase sine-wave by
Wire transmission gives the 3D-SVPWM generators, vector action time module to be calculated according to the random number that randomizer generates
The action time of operating voltage vector, when switch motion time module calculates the action of three-phase four-leg inverter or more switching tube
Between and be transferred to 3D-SVPWM generators, 3D-SVPWM generators according to receive three-phase sine-wave, vector action time and
The switch periods of setting generate pwm control signal and are opened by the IGBT that conducting wire is spread out of to three-phase four-leg inverter topological structure
Guan Guan.
Step 2：Three phase sine wave producer generates three-phase sine-wave and is transferred to 3D-SVPWM generators；
Step 3：Randomizer generates four stochastic variable ξ according to Generating Random Number1、ξ2、ξ3、ξ4, and transmit
Give vector action time module；
In step 3, the mathematical algorithm for generating random number is linear congruential method, that is, randomizer is using linear same
Remaining method generates random number.The recurrence formula of the linear congruential method is：
Nj+1=(A × Nj+ B) (congruence M) (j=0,1,2......)
Wherein, NjFor j moment values, Nj+1For j+1 moment values, A, B, M is the parameter that designer voluntarily selects, it is desirable that is met
Following condition：
Condition 1：A, B are positive integers；
Condition 2：B, M are relatively prime；
Condition 3：If M is 4 multiple, A-1 is also；
Condition 4：The product aliquot A-1 of all prime factors of M；
Condition 5：A, B, N0 (Nj, j=0) are smaller than M.
The sequence N gone out according to the above theoretical calculationjIt is exactly stochastic variable ξ1、ξ2、ξ3、ξ4。
Further, in the step 3, four stochastic variable ξ1、ξ2、ξ3、ξ4Generation cycle phase it is same, and be switch
Cycle Ts。
Step 4：Vector action time module is according to the stochastic variable evaluation work voltage vector received in a triangle
Action time T in carrier cycle0, T1, T2, T3, and it is transferred to switch motion time module；
In step 4, work of the vector action time module in evaluation work voltage vector in a triangular carrier cycle
With time T0, T1, T2And T3When obey voltage-second balance rule, i.e., as synthesized reference vector V*Operating voltage vector be V0, V1, V2
And V3When, meet：
Step 5：Switch motion time module is according to the action time T received0, T1, T2, T3Calculate inverter a, b, c, f
The random variation range T of four bridge arm pulse positionsRND1、TRND2、TRND3、TRND4；
In steps of 5, the random variation range T of tetra- bridge arm pulse positions of a, b, c, fRND1、TRND2、 TRND3、TRND4?
Can be the arbitrary value in any position of corresponding modulating section under the premise of ensureing that the switching sequence of space vector modulation is constant.
And in each sampling period, the pulse position of each bridge arm PWM is determined by random number.The pulse position of each bridge arm is switched at one
Change at random in period.In addition, switch periods are fixed.
Fig. 3 is each bridge arm impulse waveform schematic diagram of modulation algorithm of the embodiment of the present invention, and reference vector is located at I trigones at this time
The third tetrahedron of column.TRND1、TRND2、TRND3、TRND4The random variation of tetra- bridge arm pulse positions of a, b, c, f is indicated respectively
Range.The pulse of a bridge arms can at random change in any position of modulating range, and the switch in order to ensure space vector modulation is suitable
Sequence is constant, and the pulse position of the other three bridge arm must at random change in the pulsating sphere of a upper bridge arm.In the mistake of randomization
Cheng Zhong only changes the effect moment of basic vector V5, V7, V8 and V0, and the action time of basic vector remains unchanged, root
According to voltage-second balance principle, the reference vector V of synthesis*It is constant, have
V*Ts=T5V5+T7V7+T8V8+T0V0 (1)
In formula, Ts=T5+T7+T8+T0, T0For the action time of zero vector, T5、T7、T8For effective vector V5, V7, V8's
Action time.
Fig. 4 is switch function schematic diagram of the modulation algorithm of the embodiment of the present invention in different switch periods.By Fig. 4 it is found that originally
Each bridge arm pwm pulse of embodiment modulation algorithm can be randomly assigned in any position of switch periods, and degree of randomization is high, has
Preferable random effect.
Step 6：3D-SVPWM wave producers are according to the tetra- bridge arm pulse positions of three-phase sine-wave, a, b, c, f received
Random variation range TRND1、TRND2、TRND3、TRND4And the switch periods T of settings, 3D-SVPWM waves are generated, and be transferred to
Three-phase four-leg inverter.
A kind of three-phase four-leg inverter Randomized Pulse Position 3D-SVPWM control systems and its method proposed by the present invention
It can be in the case where not increasing THD (Total Harmonic Distortion total harmonic distortions), at switching frequency
Higher hamonic wave is distributed in a certain range, reduces the electromagnetic interference of system.3D-SVPWM modulation strategies are effectively improved to cause
Harmonic problem, the harmonic amplitude that will focus at switching frequency integral multiple is evenly dispersed in entire frequency domain, can
Reduce the ill effects such as noise caused by harmonic wave under lower switching frequency.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Any one skilled in the art in the technical scope disclosed by the present invention, the change or replacement that can be readily occurred in,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with scope of the claims
Subject to.
Claims (10)
1. a kind of three-phase four-leg inverter Randomized Pulse Position 3D-SVPWM control systems, which is characterized in that including three-phase four
Leg inverter, randomizer, vector action time module, switch motion time module, three phase sine wave producer and
3D-SVPWM generators, wherein：
The three phase sine wave producer is connected with the 3D-SVPWM generators, for generating three-phase sine-wave and by conducting wire
It is transferred to the 3D-SVPWM generators；
The randomizer is connected with the vector action time module, for generating four according to Generating Random Number
A stochastic variable is simultaneously transferred to the vector action time module；
The vector action time module is connected with the randomizer and switch motion time module respectively, is used for root
According to the stochastic variable evaluation work voltage vector received action time and be transferred to the switch motion time module；
The switch motion time module is connected with the vector action time module and 3D-SVPWM generators respectively, is used for
The actuation time of three-phase four-leg inverter or more switching tube is calculated according to the action time received and is transferred to 3D-SVPWM
Generator；
The 3D-SVPWM generators respectively with the three phase sine wave producer, switch motion time module and three-phase four-arm
Inverter is connected, for generating PWM controls according to the switch periods of three-phase sine-wave, vector action time and the setting received
Signal processed is simultaneously spread out of by conducting wire to the IGBT switching tubes of the three-phase four-leg inverter topological structure.
2. a kind of three-phase four-leg inverter Randomized Pulse Position 3D-SVPWM control methods, which is characterized in that including following step
Suddenly：
Step 1：Build three-phase four-leg inverter Randomized Pulse Position 3D-SVPWM method control systems；
Step 2：Three phase sine wave producer generates three-phase sine-wave and is transferred to 3D-SVPWM generators；
Step 3：Randomizer generates four stochastic variable ξ according to Generating Random Number1、ξ2、ξ3、ξ4, and it is transferred to arrow
Measure action time module；
Step 4：Vector action time module is according to the stochastic variable evaluation work voltage vector received in a triangular carrier
Action time T in period0, T1, T2, T3, and it is transferred to switch motion time module；
Step 5：Switch motion time module is according to the action time T received0, T1, T2, T3Calculate inverter a, b, c, f tetra-
The random variation range T of bridge arm pulse positionRND1、TRND2、TRND3、TRND4；
Step 6：3D-SVPWM wave producers according to the tetra- bridge arm pulse positions of three-phase sine-wave, a, b, c, f received with
Machine variation range TRND1、TRND2、TRND3、TRND4And the switch periods T of settings, 3D-SVPWM waves are generated, and be transferred to three-phase four
Leg inverter.
3. a kind of three-phase four-leg inverter Randomized Pulse Position 3D-SVPWM control methods according to claim 2,
It is characterized in that, in the step 3, the mathematical algorithm for generating random number is linear congruential method.
4. a kind of three-phase four-leg inverter Randomized Pulse Position 3D-SVPWM control methods according to claim 3,
It is characterized in that, the recurrence formula of the linear congruential method is：
Nj+1=(A × Nj+ B) (congruence M) (j=0,1,2......)
Wherein, NjFor j moment values, Nj+1For j+1 moment values, A, B, M is the parameter that designer voluntarily selects, it is desirable that meets following item
Part：
Condition 1：A, B are positive integers；
Condition 2：B, M are relatively prime；
Condition 3：If M is 4 multiple, A-1 is also；
Condition 4：The product aliquot A-1 of all prime factors of M；
Condition 5：A, B, N0 (Nj, j=0) are smaller than M.
The sequence N gone out according to the above theoretical calculationjIt is exactly stochastic variable ξ1、ξ2、ξ3、ξ4。
5. a kind of three-phase four-leg inverter Randomized Pulse Position 3D-SVPWM control methods according to claim 2,
It is characterized in that, in the step 3, four stochastic variable ξ1、ξ2、ξ3、ξ4Generation cycle phase it is same, and be switch periods Ts。
6. a kind of three-phase four-leg inverter Randomized Pulse Position 3D-SVPWM control methods according to claim 2,
It is characterized in that, in the step 4, vector action time module is in evaluation work voltage vector in a triangular carrier cycle
Action time T0, T1, T2And T3When obey voltage-second balance rule, i.e., as synthesized reference vector V*Operating voltage vector be V0, V1,
V2And V3When, meet：
7. a kind of three-phase four-leg inverter Randomized Pulse Position 3D-SVPWM control methods according to claim 2,
It is characterized in that, in the step 5, the random variation range T of tetra- bridge arm pulse positions of a, b, c, fRND1、TRND2、TRND3、TRND4
Can be arbitrary in any position of corresponding modulating section under the premise of ensureing that the switching sequence of space vector modulation is constant
Value.
8. a kind of three-phase four-leg inverter Randomized Pulse Position 3D-SVPWM control methods according to claim 7,
It is characterized in that, in each sampling period, the pulse position of each bridge arm PWM is determined by random number.
9. a kind of three-phase four-leg inverter Randomized Pulse Position 3D-SVPWM control methods according to claim 7,
It is characterized in that, the pulse position of each bridge arm changes at random in a switch periods.
10. a kind of three-phase four-leg inverter Randomized Pulse Position 3D-SVPWM control methods according to claim 7,
It is characterized in that, switch periods are fixed.
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