CN107947619A - There are two level carrier phase-shift PWM modulator approaches of common-mode voltage rejection ability suitable for multiphase system - Google Patents
There are two level carrier phase-shift PWM modulator approaches of common-mode voltage rejection ability suitable for multiphase system Download PDFInfo
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- CN107947619A CN107947619A CN201711339815.2A CN201711339815A CN107947619A CN 107947619 A CN107947619 A CN 107947619A CN 201711339815 A CN201711339815 A CN 201711339815A CN 107947619 A CN107947619 A CN 107947619A
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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
-
- 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
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The two level carrier phase-shift PWMs for having common-mode voltage (CMV) rejection ability suitable for multiphase system modulate (CPS SPWM) method, belong to power electronics field, it is characterized in that, by the phase shift for setting triangular carrier, kth sinusoidal modulation wave and triangular carrier are subjected to pulse width modulation (PWM), and then obtain the control signal step of the phase bridge arm(k)；If step(k)=0, then the drive signal of the upper and lower bridge arm power switch pipe of kth phase bridge arm is respectively 0 and 1；If step(k)=1, then the drive signal of the upper and lower bridge arm power switch pipe of kth phase bridge arm is respectively 1 and 0, and the suppression to multiphase system CMV is realized with this；To applied to five phases, six symmetrical and six phase asymmetry drive and control of electric machine two-level inverters are emulated by application traditional SPWM modulator approaches and CPS SPWM modulator approaches proposed by the present invention and experimental verification, comparative analysis shows, modulator approach proposed by the present invention has good CMV inhibitions in polyphase inverter, and the method for the present invention can expand to any multiphase system.
Description
Technical field
The present invention relates to power electronics field, more particularly to a kind of multiphase system that is suitable for have common-mode voltage
(CMV) two level carrier phase-shift PWMs modulation (CPS-SPWM) method of rejection ability.
Background technology
In the research boom of polyphase machine drive control, the topological structure for a variety of polyphase inverters that have been born.But each
It is most widely used to remain traditional two level of voltage-type topology in type, the polyphase machine driving occasion of the different numbers of phases
Structure.But its extensively using in, there are some significant negative effects, the most typical one, it is serious be exactly high frequency CMV
The problem of.
Excessive CMV can increase the insulation stress of motor winding over the ground, easily cause insulation breakdown, and influencing motor makes
Use the service life；High frequency CMV can generate shaft current on motor reel, cause " galvanic corrosion " of bearing, shorten the service life of bearing；This
Outside, the high-frequency leakage current that high frequency CMV is produced not only results in EMI, influences other equipment in power grid and works normally, can also influence inverse
Become the safety of device Power Electronic Circuit.Therefore, the suppressing method for studying multiphase system CMV has important theory significance and practicality
Value.
American scholar Kimball once used three-phase two-level inverter similar phase-shifted SPWM modulation strategy,
It is found that the CMV inhibitions of this modulator approach, still, further explanation theoretically and carries out experiment and test
Card.Meanwhile start with before from modulation strategy and suppress the research of multi-phase converter CMV and be directed to three level or more level mostly
Topological structure and three-phase system, there is presently no the research of the CMV suppressing methods for two level polyphase inverter systems.
The content of the invention
The present invention is directed to most widely used monofocal two-level inverter, it is proposed that one kind can significantly inhibit CMV, can
To expand to the phase-shifted SPWM of any multiphase system modulation (CPS-SPWM) method, and through emulating and testing, demonstrate
CMV inhibitions excellent CPS-SPWM.
To realize above-mentioned goal of the invention, the present invention provides a kind of suitable for two of multiphase system with CMV rejection abilities
Level CPS-SPWM methods, 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.
The foregoing multiphase system that is suitable for has two level CPS-SPWM methods of CMV rejection abilities, 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, with
Exemplified by symmetrical five-phase induction motor, the modulated signal phase shift angle of its kth phaseIt is as follows：
The multiphase system of other numbers of phases calculates according to actual conditions and carries out phase shift.
The foregoing multiphase system that is suitable for has two level CPS-SPWM methods of CMV rejection abilities, it is characterised in that：
In the step (2), each phase triangular carrier u is calculatedc, by taking kth phase as an example, set kth phase triangular carrier counter initial first
ValueMethod such as following formula：
M represents the system as m phase systems in formula.
According to formula (5) method it is respectively then that each phase triangular carrier counter assigns initial value during system operationGeneration
Corresponding triangular carrier, the phase shift to triangular carrier is realized with this.
The foregoing multiphase system that is suitable for has two level CPS-SPWM methods of CMV rejection abilities, it is characterised in that：
In the step (3), the kth phase modulating wave u that is drawn by step (1) and step (2)0(k)With kth phase carrier wave uc(k)Carry out PWM tune
System, obtains the pwm control signal of the power switch pipe of kth phase bridge arm.Kth phase is directed to, judges modulating wave u0(k)Whether it is more than
Triangular carrier is uc(k)If step(k)=1, otherwise step(k)=0, step herein(k)For the power switch pipe of kth phase bridge arm
Pwm control signal.
The foregoing multiphase system that is suitable for has two level CPS-SPWM methods of CMV rejection abilities, it is characterised in that：
In the step (4), the drive signal that each phase pwm control signal obtained by step (3) is converted into corresponding power switch pipe is distinguished
Put into the power switch pipe that two-level inverter corresponds to phase, specific method is：
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 being passed applied to five phases, six symmetrical and six phase asymmetry drive and control of electric machine two-level inverters by application
The SPWM modulator approaches of system are emulated with CPS-SPWM modulator approaches proposed by the present invention and carry out experimental verification, comparative analysis
Show, modulator approach proposed by the present invention has good CMV inhibitions in polyphase inverter, or even can be in even number phase
CMV is completely eliminated in symmetric form inverter, fully demonstrates the validity of this method；This method can drive in polyphase machine and control
The application scenario of stronger low-frequency filter characteristics is presented in even load processed；And this method need to be only improved from software aspects, without
Increase any hardware auxiliary to implement, therefore the cost of multiphase system CMV suppression can be reduced, feasibility is high, has stronger reality
The property used.The suppression to CMV peak-to-peak values in the multiphase system based on two-level inverter can be not only realized using this method.
Brief description of the drawings
Fig. 1 is the flow chart of CPS-SPWM methods proposed by the present invention.
Fig. 2 is that CMV is defined in two level m phase inverters.
Fig. 3 is the original that the five phase two-level inverters based on isopleth picture produce CMV under traditional SPWM modulation
Reason analysis.
Fig. 4 produces for the five phase two-level inverters based on isopleth picture under CPS-SPWM proposed by the present invention modulation
The principle analysis of raw CMV.
Fig. 5 is five phases, the band RL loads of symmetrical six phase, asymmetric six phases inverter are led to using two kinds of SPWM modulator approaches respectively
Cross the contrast waveform of emulation gained CMV.
Fig. 6 be index of modulation M of the five phase two-level inverters in the case where two kinds of SPWM are modulated as emulating and test obtained by and
CMV peak-to-peak values vp-pBetween relation.
Fig. 7 is five phases, the band RL loads of symmetrical six phase, asymmetric six phases inverter are led to using two kinds of SPWM modulator approaches respectively
Cross the contrast waveform of experiment gained CMV.
Fig. 8 applies two kinds of SPWM modulator approaches CMV as obtained by experiment for five phase induction machine of Five-phase inverter band respectively
Contrast waveform.
Embodiment
The present invention is described further with embodiment below in conjunction with the accompanying drawings.
Fig. 1 is that the multiphase system that is suitable for proposed by the invention has two level CPS-SPWM methods of CMV rejection abilities
Flow chart.
The basic principle of the present invention is briefly introduced by taking five-phase induction motor as an example below.Fig. 2 is CMV in two level m phase inverters
vcomDefinition.In traditional SPWM modulation, out of phase triangular carrier phase is identical, using isopleth picture, is led to
Cross the region track of carrier wave ratio straight line passed through and can obtain CMV waveforms shown in Fig. 3, it is clear that in traditional SPWM modulation systems
Under, the CMV of five phase two-level inverters shares 6 kinds of amplitudes, and excursion is-Vdc/ 2 arrive Vdc/ 2, this and existing research conclusion
Unanimously.Difference lies in the no longer complete phase of triangular carrier of each phase with traditional SPWM for CPS-SPWM methods proposed by the present invention
Together, there are certain phase difference between adjacent two-phase carrier wave, reflection is T on a timelinec/ m, is reflected in ωcOn t axis for 2 π/
m.CMV that five phase two-level inverters produce under CPS-SPWM modulator approaches proposed by the present invention as shown in figure 4, with Fig. 3 phases
Than I classes and II classes region, this explanation are not present in Fig. 4WithSwitch combination be eliminated, therefore in CMV
There is no-Vdc/ 2 and Vdc/ 2 magnitude of voltage, CMV amplitude ranges reduce 40%.Above is it is directed to five based on isopleth picture
The principle analysis that phase motor application CPS-SPWM modulator approaches CMV proposed by the present invention suppresses, this analysis method are more for other
Phase system is equally applicable.
Based on above theory analysis, five phases, symmetrical six phase, asymmetric six phase have been built in MATLAB/Simulink
The simulation model that two-level inverter is loaded with RL.Simulation parameter is arranged to：Busbar voltage Vdc=180V, switching frequency (carry
Wave frequency rate) fc=2kHz, frequency of modulated wave fo=50Hz, the load R=10 Ω per phase resistance, the load L=50mH per phase inductance, is adjusted
System M=0.8, the dead time T of switching devicedead=3.5 μ s.
As shown in figure 5, under traditional SPWM modulation, the peak-to-peak value v of the CMV of three kinds of invertersp-pIt is bus voltage value
180V, after application modulator approach proposed by the present invention, the peak-to-peak value v of the CMV of Five-phase inverterp-pIt is reduced to 108V, symmetrical six
The peak-to-peak value v of the CMV of phase inverterp-pIt is reduced to 0V, the peak-to-peak value v of the CMV of asymmetric six phases inverterp-pIt is reduced to 120V.
Fig. 6 is shown in the case where two kinds of SPWM are modulated, for index of modulation M of the Five-phase inverter as obtained by emulating and test and CMV peaks
Relation between peak value.When carrying CPS-SPWM modulation methods using the present invention as seen from the figure, CMV peak-to-peak values are reduced when M is relatively low
80%, reduce 40% in M higher.
The CMV simulation results contrast that 1 two kinds of SPWM methods of table produce
| SPWM | CPS-SPWM | Range of decrease ratio | |
| Five phases | 180V | 108V | 40% |
| Symmetrical six phase | 180V | 0V | 100% |
| Asymmetric six phase | 180V | 120V | 33.33% |
Table 1 is three kinds of inverters respectively using CMV simulation results contrast caused by two kinds of SPWM methods.As seen from table,
Compared with traditional SPWM modulation, CPS-SPWM modulator approaches proposed by the present invention can effectively reduce the peak-to-peak value v of CMVp-p。
Then, the experimental verification with RL loads has been carried out to method proposed by the present invention.Parameter setting in experiment is with imitating
Parameter setting in very is consistent.Fig. 7 is CMV waveform of three kinds of inverters under two kinds of SPWM modulator approaches, it is clear that with emulating institute
Result is consistent, demonstrate the validity that method proposed by the present invention suppresses CMV again.
Finally, translator experiment has been carried out to institute's extracting method of the present invention, two kinds of SPWM has been carried out on five phase induction machines
The contrast experiment of modulator approach, table 2 are the major parameter of five phase induction machines, test median generatrix voltage Vdc=200V, switch frequency
Rate (carrier frequency) fc=10kHz, the dead time T of switching devicedead=3.0 μ s, the command value of motor speed is 800r/
Min, the control mode that motor controls are rotor flux-orientation vector control.
The major parameter of 2 five phase induction machine of table
Fig. 8 is produced respectively when driving the experiment of five phase induction machines using two kinds of SPWM modulator approaches for five phase two-level inverters
Raw CMV waveforms.As seen from the figure under traditional SPWM modulation, CMV peak-to-peak values vp-pFor 200V, and in tune proposed by the invention
The lower v of systemp-pDrop to 40V, have dropped 80%, be consistent with Fig. 5 simulation results.
In conclusion CPS-SPWM modulator approaches proposed by the present invention in polyphase inverter there is good CMV to suppress
Effect, or even CMV can be completely eliminated in the symmetrical inverter of even number.
Claims (5)
1. there are two level CPS-SPWM methods of common-mode voltage rejection ability suitable for multiphase system, it is characterised in that including
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 CPS-SPWM
Modulation, 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 two level CPS-SPWM sides suitable for multiphase system with common-mode voltage rejection ability according to claim 1
Method, it is characterised in that：In the step (1), kth phase modulating wave u0(k)Computational methods be：
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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,For the modulated signal phase shift angle of kth phase, with symmetrical
Exemplified by five-phase induction motor, the modulated signal phase shift angle of its kth phaseIt is as follows：
The multiphase system of other numbers of phases calculates according to actual conditions and carries out phase shift.
3. the two level CPS-SPWM sides suitable for multiphase system with common-mode voltage rejection ability according to claim 1
Method, it is characterised in that：In the step (2), each phase triangular carrier u is calculatedc, by taking kth phase as an example, kth phase three is set first
Angle carrier wave counter initial valueMethod such as following formula：
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M represents the system as m phase systems in formula.
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 two level CPS-SPWM sides suitable for multiphase system with common-mode voltage rejection ability according to claim 1
Method, it is characterised in that：In the step (3), the kth phase modulating wave u that is drawn by step (1) and step (2)0(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, judge to adjust
Ripple u processed0(k)Whether it is u more than triangular carrierc(k)If step(k)=1, otherwise step(k)=0, step herein(k)For kth phase bridge
The pwm control signal of the power switch pipe of arm.
5. the two level CPS-SPWM sides suitable for multiphase system with common-mode voltage rejection ability according to claim 1
Method, it is characterised in that：In the step (4), each phase pwm control signal obtained by step (3) is converted into corresponding power switch
The drive signal of pipe is put into the power switch pipe that two-level inverter corresponds to phase respectively, and specific 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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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110011581A (en) * | 2019-01-28 | 2019-07-12 | 华中科技大学 | A kind of suppressing method and system of asymmetric six phases alternating current generator common-mode noise |
| WO2023142538A1 (en) * | 2022-01-26 | 2023-08-03 | 张逸兴 | Inverter apparatus and application thereof |
-
2017
- 2017-12-14 CN CN201711339815.2A patent/CN107947619A/en not_active Withdrawn
Non-Patent Citations (1)
| Title |
|---|
| ZICHENG LIU.ET AL.: "Reduction of Common-Mode Voltage in Multiphase Two-Level Inverters Using SPWM With Phase-Shifted Carriers", 《IEEE TRANSACTIONS ON POWER ELECTRONICS》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110011581A (en) * | 2019-01-28 | 2019-07-12 | 华中科技大学 | A kind of suppressing method and system of asymmetric six phases alternating current generator common-mode noise |
| WO2023142538A1 (en) * | 2022-01-26 | 2023-08-03 | 张逸兴 | Inverter apparatus and application thereof |
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