CN107994793A - There is the anti-phase PWM method of triangular carrier of common-mode voltage rejection ability for asymmetric six phases, two level converter - Google Patents
There is the anti-phase PWM method of triangular carrier of common-mode voltage rejection ability for asymmetric six phases, two level converter 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
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or 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
- H02M7/539—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 with automatic control of output wave form or frequency
- H02M7/5395—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 with automatic control of output wave form or frequency by pulse-width modulation
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/123—Suppression of common mode voltage or current
Abstract
There is the anti-phase PWM modulation of triangular carrier (TCPO SPWM) method of common-mode voltage rejection ability for asymmetric six phases, two level converter, belong to power electronics field, it is characterised in that calculate the modulating wave of each phase first；Then the initial value of each phase triangular carrier counter is set to realize the same phase of the triangular carrier of every group of three-phase windings, and two groups of triangular carrier is anti-phase；Kth phase modulating wave and triangular carrier are carried out pulse width (PWM) to modulate, and then obtain phase bridge arm power switch pipe control signal step(k)；According to step(k)The drive signal of signal generation power switch pipe, the suppression to asymmetric six phases, two level converter common-mode voltage is realized with this；Asymmetric six phases two-level inverter is emulated and tested with CPS SPWM modulator approaches proposed by the present invention using traditional SPWM modulator approaches respectively, comparative analysis shows, modulator approach proposed by the present invention has more preferably CMV inhibitions.
Description
Technical field
The present invention relates to power electronics field, more particularly to one kind to be used for asymmetric six phases, two level converter and have
The anti-phase PWM modulation of triangular carrier (TCPO-SPWM) method of common-mode voltage rejection ability.
Background technology
Multiphase drive system is since its reliability is high, and torque pulsation is low, and the advantages such as specified phase current is small are subject to more and more
Concern.Due to being easier to match with existing three-phase system, asymmetric six-phase motor (or double three-phase machine) has become most normal
Polyphase machine type.Meanwhile traditional two-level inverter is deep by people with its simple topological, simple and direct control algolithm
Welcome, thus as the most widely used topological structure among polyphase machine drive control research so far.
Common-mode voltage (CMV) is one of most typical side effect of pulsewidth modulation (PWM) inverter drive system.Amplitude
CMV can trigger electrical discharge machining mechanism (EDM), and for EDM discharge currents breakdown oil film dielectric so as to cause damage of the bearing, this is big
The big reliability and service life that have impact on motor.
For many years, Many researchers propose hardware or software approach to suppress CMV.Most of hardware approach use will
Passive or active C MV wave filters are applied in inverter.There is the hardware solution that foreign scholar proposes a kind of shunt chopper recently
Certainly scheme, wherein output CMV can be eliminated between two inverters.However, all hardware approach are all inevitably
The cost of system is added, particularly in multiphase application.In contrast, software solution then opposite popularization, it is main to concentrate
In the improvement of PWM method.
To suppress the method for CMV phase-shifting carrier waves pulsewidth modulation (CPS-SPWM) and space vector pulse width modulation (SVPWM) side
Method is all once proposed for polyphase inverter, but the seldom type of two level of asymmetric six phase of document concern.In fact, in multiphase
In the case of driving, CPS-SPWM methods are unrelated with the number of phases, this causes it to be easily achieved than SVPWM.Therefore, the present invention is based on
The method of CPS-SPWM proposes a kind of modulator approach for asymmetric six phases two-level inverter with CMV rejection abilities, right
The suppression of multiphase system CMV has important theory significance and practical value.
The content of the invention
The present invention is directed to asymmetric six phases two-level inverter for most widely used, it is proposed that one kind can significantly press down
Phase-shifted SPWM modulation (TCPO-SPWM) method of CMV processed, and through emulating and testing, it is excellent effectively to demonstrate institute's extracting method
CMV inhibitions.
To realize above-mentioned goal of the invention, the present invention provides one kind has CMV for asymmetric six phases, two level converter
The anti-phase PWM modulation of triangular carrier (TCPO-SPWM) method of rejection ability, it is characterised in that comprise the following steps：
Step (1), calculates kth phase modulating wave u0(k)；
Step (2), calculates kth phase carrier wave uc(k)；
Step (3), by the kth phase modulating wave u obtained by step (1) and step (2)0(k)With kth phase carrier wave uc(k)Carry out PWM
Modulation, obtains the pwm control signal of kth phase bridge arm；
Each phase pwm control signal obtained by step (3), is converted into the drive signal point of corresponding power switch pipe by step (4)
Do not put into the power switch pipe that two-level inverter corresponds to phase, you can achieve the object of the present invention.
Being previously described for asymmetric six phases, two level converter has the anti-phase PWM modulation of triangular carrier of CMV rejection abilities
(TCPO-SPWM) method, it is characterised in that：In the step (1), kth phase modulating wave u0(k)Computational methods be：
In formula, M is modulation degree, can be manually set；
TmaxIt is as follows for triangular carrier amplitude, its calculation：
Wherein fcount、fswitchSystem sampling frequency, system switching frequency (carrier frequency) are corresponded to respectively；
ukFor the modulated signal of kth phase, expression is：
Wherein f0For frequency of modulated wave, t is system current run time,For the modulated signal phase shift angle of kth phase, then
The modulated signal phase shift angle of asymmetric six phases, two level converter kth phaseAs shown in formula (4)：
Being previously described for asymmetric six phases, two level converter has the anti-phase PWM modulation of triangular carrier of CMV rejection abilities
(TCPO-SPWM) method, it is characterised in that：In the step (2), each phase triangular carrier u is calculatedc, every group of three-phase windings adopt
With identical triangular carrier, and the reverse-phase of two groups of carrier wave.By taking kth phase as an example, kth phase triangular carrier is set first
Counter initial valueMethod such as following formula：
During system operation then initial value is assigned for each phase triangular carrier counter according to formula (5) methodGeneration corresponds to
Triangular carrier, the phase shift to triangular carrier is realized with this.
Being previously described for asymmetric six phases, two level converter has the anti-phase PWM modulation of triangular carrier of CMV rejection abilities
(TCPO-SPWM) method, it is characterised in that：In the step (3), mutually modulated with the kth that step (2) is drawn by step (1)
Ripple u0(k)With kth phase carrier wave uc(k)PWM modulation is carried out, the pwm control signal of the power switch pipe of kth phase bridge arm is obtained, is directed to
Kth phase, judges modulating wave u0(k)Whether it is u more than triangular carrierc(k)If step(k)=1, otherwise step(k)=0, herein
step(k)For the pwm control signal of the power switch pipe of kth phase bridge arm.
Being previously described for asymmetric six phases, two level converter has the anti-phase PWM modulation of triangular carrier of CMV rejection abilities
(TCPO-SPWM) method, it is characterised in that：In the step (4), each phase pwm control signal obtained by step (3) is converted into
The drive signal of corresponding power switch pipe is put into the power switch pipe that two-level inverter corresponds to phase respectively, specific method
For：
Work as step(k)When=0, the drive signal of the upper bridge arm power switch pipe of kth phase bridge arm is 0, lower bridge arm power switch
The drive signal of pipe is 1；
Work as step(k)When=1, the drive signal of the upper bridge arm power switch pipe of kth phase bridge arm is 1, lower bridge arm power switch
The drive signal of pipe is 0.
To the two-level inverter applied to asymmetric six-phase motor drive control by applying traditional SPWM modulation methods
Method carries out simulating, verifying with TCPO-SPWM modulator approaches proposed by the present invention, and comparative analysis shows, modulation methods proposed by the present invention
Method has good CMV inhibitions in the two-level inverter of asymmetric six-phase motor drive control, to further illustrate
The validity of the method for the present invention, band RL equivalent loads have been carried out for the two-level inverter of asymmetric six-phase motor drive control
Experiment, gained experimental waveform result is consistent with theory analysis, and that more fully tests has demonstrate,proved the validity and practicality of this method；This
Method need to be only improved from software aspects, be implemented without increasing any hardware auxiliary, therefore can reduce multiphase system common mode
The cost that voltage suppresses, feasibility is high, has stronger practicality.It can be realized using this method and asymmetric six-phase motor is driven
The suppression of CMV peak-to-peak values in the two-level inverter of control.
Brief description of the drawings
Fig. 1 is the flow chart of TCPO-SPWM methods proposed by the present invention.
Fig. 2 is that CMV is defined in asymmetric six phases two-level inverter.
Fig. 3 is that the asymmetric six phases two-level inverter based on isopleth picture produces under traditional SPWM modulation
The principle analysis of CMV.
Fig. 4 is that asymmetric six-phase system is considered as " double three-phases " system phase explanatory drawin.
Fig. 5 is triangular carrier schematic diagram used in TCPO-SPWM methods proposed by the present invention in a switch periods.
Fig. 6 is the asymmetric six phases two-level inverter based on isopleth picture in TCPO-SPWM proposed by the present invention
The lower principle analysis for producing CMV of modulation.
Fig. 7 is with obtained by RL load simulations using tradition SPWM modulator approaches to asymmetric six phases two-level inverter
CMV。
Fig. 8 is that application TCPO-SPWM modulator approaches proposed by the present invention bear asymmetric six phases two-level inverter band RL
Carry the CMV of emulation gained.
Fig. 9 is with obtained by RL load tests using tradition SPWM modulator approaches to asymmetric six phases two-level inverter
CMV。
Figure 10 is that application TCPO-SPWM modulator approaches proposed by the present invention bear asymmetric six phases two-level inverter band RL
Carry the CMV of experiment gained.
Embodiment
The present invention is described further with embodiment below in conjunction with the accompanying drawings.
Fig. 1 is the triangle load for being used for asymmetric six phases, two level converter and having CMV rejection abilities proposed by the invention
The flow chart of the anti-phase PWM modulation of ripple (TCPO-SPWM) method.
The basic principle of the present invention is briefly introduced first.Fig. 2 is common-mode voltage in asymmetric six phases two-level inverter
(CMV) vcomDefinition.In traditional SPWM modulation, out of phase triangular carrier phase is identical, utilizes equivalent line drawing
Method is painted, the region passed through by the track of carrier wave ratio straight line can obtain the CMV waveforms shown in Fig. 3, it is clear that in traditional SPWM
Under modulation system, the CMV of asymmetric six phases two-level inverter shares 7 kinds of amplitudes, and excursion is-Vdc/ 2 arrive Vdc/ 2, this with
Existing research conclusion is consistent.The region and the mapping table of CMV that table 1 marks off for isopleth picture.The present invention proposes
TCPO-SPWM methods difference lies in the triangular carrier of each phase is no longer identical, for the ease of retouching with traditional SPWM
State, asymmetric six phase is considered as two groups of symmetrical three-phases, Fig. 4 show the phase relation of each phase of " double three-phases " system, can by figure
Know A1, B1, C1 are one group of three-phase windings, A2, B2, and C2 is one group of three-phase windings, and two groups of three-phase windings phases are staggered π/6.This hair
The TCPO-SPWM methods of bright proposition use identical triangular carrier for every group of three-phase windings, and the phase phase of two groups of carrier wave
Poor π.Fig. 5 is triangular carrier schematic diagram used in TCPO-SPWM methods proposed by the present invention in a switch periods.
Correspondence between 1 different types of region of table and CMV values
CMV such as Fig. 6 that asymmetric six phases two-level inverter produces under TCPO-SPWM modulator approaches proposed by the present invention
It is shown.Compared with Fig. 3, I classes, II classes, VI classes and VII classes region are not present in Fig. 6, this explanation is in TCPO- proposed by the present invention
Under SPWM modulator approaches,Switch combination be eliminated, therefore ± V is not present in common-mode voltagedc/ 2 and ±
Vdc/ 3 magnitude of voltage, very intuitively, common-mode voltage amplitude range reduce 66.67%.
Based on above theory analysis, the two-level inverter band of asymmetric six phase has been built in MATLAB/Simulink
The simulation model of RL loads.Table 2 is the setting of simulation parameter.
As shown in fig. 7, under traditional SPWM modulation, the peak-to-peak value v of the CMV of asymmetric six phases two-level invertercom_pp
For bus voltage value 180V, after application modulator approach proposed by the present invention, the CMV's of asymmetric six phases two-level inverter
Peak-to-peak value vcom_pp60V is reduced to, as shown in Figure 8.Meanwhile emulate and find, the change of modulation degree M does not interfere with the amplitude of CMV.
2 simulation parameter of table is set
After being emulated using two kinds of SPWM methods to asymmetric six phases two-level inverter, as shown in table 3 imitate is obtained
True result.As seen from table, compared with traditional SPWM modulation, TCPO-SPWM methods proposed by the present invention can be by the peak of CMV
Peak value vcom_ppReduction by 66.67%, it is consistent with theory analysis.
3 two kinds of SPWM methods and results contrasts of table
| SPWM | CPS-SPWM | Range of decrease ratio | |
| Vcom_pp | 180V | 60V | 66.67% |
Then, using TCPO-SPWM methods proposed by the present invention band has been carried out on asymmetric six phases two-level inverter
The experimental verification of RL loads.Parameter setting in experiment is consistent with the parameter setting in emulation.Fig. 9, Figure 10 are asymmetric six phase
CMV waveform of the two-level inverter in the case where two kinds of SPWM are modulated, it is clear that it is consistent with emulation acquired results, more fully demonstrate
Method proposed by the present invention suppresses the validity of CMV.
In conclusion CPS-SPWM modulator approaches proposed by the present invention in asymmetric six phases two-level inverter have it is good
Good CMV inhibitions.
Claims (5)
1. there is the anti-phase PWM modulation (TCPO- of triangular carrier of CMV rejection abilities for asymmetric six phases, two level converter
SPWM) method, it is characterised in that comprise the following steps：
Step (1), calculates kth phase modulating wave u0(k)；
Step (2), calculates kth phase carrier wave uc(k)；
Step (3), by the kth phase modulating wave u obtained by step (1) and step (2)0(k)With kth phase carrier wave uc(k)Carry out TCPO-
SPWM is modulated, and obtains the pwm control signal of kth phase bridge arm；
Step (4), the drive signal that each phase pwm control signal obtained by step (3) is converted into corresponding power switch pipe is thrown respectively
Enter in the pipe for corresponding to phase to two-level inverter, you can achieve the object of the present invention.
2. the triangular carrier for asymmetric six phases, two level converter with CMV rejection abilities according to claim 1
Anti-phase PWM modulation (TCPO-SPWM) method, it is characterised in that：In the step (1), kth phase modulating wave u0(k)Calculating side
Method is：
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In formula,
M is modulation degree, can be manually set；
TmaxIt is as follows for triangular carrier amplitude, its calculation：
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Wherein fcount、fswitchSystem sampling frequency, system switching frequency (carrier frequency) are corresponded to respectively；
ukFor the modulated signal of kth phase, expression is：
Wherein f0For frequency of modulated wave, t is system current run time,It is for the modulated signal phase shift angle of kth phase, then non-right
Claim the modulated signal phase shift angle of six phases, two level converter kth phaseAs shown in formula (4)：
3. the triangular carrier for asymmetric six phases, two level converter with CMV rejection abilities according to claim 1
Anti-phase PWM modulation (TCPO-SPWM) method, it is characterised in that：In the step (2), each phase triangular carrier u is calculatedc, every group
Three-phase windings use identical triangular carrier, and the reverse-phase of two groups of carrier wave.By taking kth phase as an example, kth phase is set first
Triangular carrier counter initial valueMethod such as following formula：
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During system operation then initial value is assigned for each phase triangular carrier counter according to formula (5) methodGenerate corresponding triangle
Carrier wave, the phase shift to triangular carrier is realized with this.
4. the triangular carrier for asymmetric six phases, two level converter with CMV rejection abilities according to claim 1
Anti-phase PWM modulation (TCPO-SPWM) method, it is characterised in that：In the step (3), drawn by step (1) and step (2)
Kth phase modulating wave u0(k)With kth phase carrier wave uc(k)PWM modulation is carried out, obtains the PWM controls of the power switch pipe of kth phase bridge arm
Signal, is directed to kth phase, judges modulating wave u0(k)Whether it is u more than triangular carrierc(k)If step(k)=1, otherwise step(k)
=0, step herein(k)For the pwm control signal of the power switch pipe of kth phase bridge arm.
5. the triangular carrier for asymmetric six phases, two level converter with CMV rejection abilities according to claim 1
Anti-phase PWM modulation (TCPO-SPWM) method, it is characterised in that：In the step (4), each phase PWM obtained by step (3) is controlled
The drive signal that signal processed is converted into corresponding power switch pipe is put into the pipe that two-level inverter corresponds to phase respectively, specifically
Method is：
As step=0, the drive signal of bridge arm power switch pipe is 0 on two-level inverter, lower bridge arm power switch pipe
Drive signal is 1；
As step=1, the drive signal of bridge arm power switch pipe is 1 on two-level inverter, lower bridge arm power switch pipe
Drive signal is 0.
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| CN109889128A (en) * | 2019-01-31 | 2019-06-14 | 华中科技大学 | A kind of double three-phase windings alternating current generator CM Noise Cancellations and system |
| CN109995259A (en) * | 2019-05-17 | 2019-07-09 | 山东大学 | The common-mode voltage suppressing method and system of DC side imbalance NPC three-level inverter |
| CN110350815A (en) * | 2019-06-30 | 2019-10-18 | 华中科技大学 | A kind of sawtooth carrier wave PWM method for symmetrical Odd Phases two-level inverter |
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| CN109889128A (en) * | 2019-01-31 | 2019-06-14 | 华中科技大学 | A kind of double three-phase windings alternating current generator CM Noise Cancellations and system |
| CN109995259A (en) * | 2019-05-17 | 2019-07-09 | 山东大学 | The common-mode voltage suppressing method and system of DC side imbalance NPC three-level inverter |
| CN109995259B (en) * | 2019-05-17 | 2020-04-21 | 山东大学 | Common-mode voltage suppression method and system of NPC three-level inverter with unbalanced direct current side |
| CN110350815A (en) * | 2019-06-30 | 2019-10-18 | 华中科技大学 | A kind of sawtooth carrier wave PWM method for symmetrical Odd Phases two-level inverter |
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