CN110401333A - Inhibit PWM method, system and the associated component of bus current ripple - Google Patents
Inhibit PWM method, system and the associated component of bus current ripple Download PDFInfo
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- CN110401333A CN110401333A CN201910702215.0A CN201910702215A CN110401333A CN 110401333 A CN110401333 A CN 110401333A CN 201910702215 A CN201910702215 A CN 201910702215A CN 110401333 A CN110401333 A CN 110401333A
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- pwm signal
- pwm
- bus current
- inversion unit
- frequency converter
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
-
- 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
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- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
This application discloses a kind of PWM method, system and associated components for inhibiting bus current ripple, are applied to two-in-one frequency converter, comprising: obtain default PWM modulation parameter；The first pwm signal and the second pwm signal are determined according to default PWM modulation parameter, the phase difference of first pwm signal and the second pwm signal is that preset phase is poor, so that corresponding first bus current of the first pwm signal and corresponding second bus current of the second pwm signal are not overlapped；The first pwm signal and the second pwm signal are applied to the first inversion unit and the second inversion unit respectively.Since the first pwm signal in the application and the second pwm signal have preset phase poor, therefore corresponding first bus current of the two and the second bus current are not overlapped, to which the peak value of bus current is substantially reduced, reduce current peak and the calorific value of bus capacitor unit, capacitor design value reduces, and system cost reduces.
Description
Technical field
The present invention relates to field of inserter control, in particular to a kind of PWM method for inhibiting bus current ripple is
System and associated component.
Background technique
As frequency converter is using more and more extensive, the competitive pressure between each frequency converter producer is increasing, at
This control is increasingly stringenter.In certain industries, a frequency converter needs while controlling two inversion units, to make it respectively
The motor independent operating of connection.If two motors all work under full load conditions at this time, the peak value of bus current ripple can compare
Much larger when single inversion unit work, current fluctuation amplitude becomes larger, while the current peak on capacitor increases, capacitor fever ratio
It is larger, generate security risk.
Therefore, how to provide a kind of scheme of solution above-mentioned technical problem is that current those skilled in the art need to solve
Problem.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of inhibition bus current ripples for inhibiting bus current ripple
PWM method, system and associated component.Its concrete scheme is as follows:
A kind of PWM method inhibiting bus current ripple, is applied to two-in-one frequency converter, comprising:
Obtain default PWM modulation parameter；
Determine the first pwm signal and the second pwm signal according to the default PWM modulation parameter, first pwm signal with
The phase difference of second pwm signal is that preset phase is poor, so that corresponding first bus current of first pwm signal and institute
Corresponding second bus current of the second pwm signal is stated not to be overlapped；
First pwm signal and second pwm signal are applied to the first inversion unit and the second inversion list respectively
In member.
Preferably, the preset phase difference is a quarter of predetermined period.
Correspondingly, being applied to two-in-one change the invention also discloses a kind of PWM modulation system for inhibiting bus current ripple
Frequency device, comprising:
Parameter module, for obtaining default PWM modulation parameter；
Signaling module, it is described for determining the first pwm signal and the second pwm signal according to the default PWM modulation parameter
The phase difference of first pwm signal and second pwm signal is that preset phase is poor, so that first pwm signal corresponding the
One bus current and corresponding second bus current of second pwm signal are not overlapped；
Action module, for first pwm signal and second pwm signal to be applied to the first inversion unit respectively
On the second inversion unit.
Preferably, the preset phase difference is a quarter of predetermined period.
Correspondingly, being applied to two-in-one change the invention also discloses a kind of PWM modulation device for inhibiting bus current ripple
Frequency device, comprising:
Memory, for storing modulation program；
Processor realizes the PWM modulation for inhibiting bus current ripple as described above when for executing the modulation program
The step of method.
Correspondingly, the invention also discloses a kind of two-in-one frequency converters for inhibiting bus current ripple, including such as institute above
State inhibit bus current ripple PWM modulation device, rectifier power source, capacitor cell, the first inversion unit, the second inversion unit,
First load, the second load, in which:
It is inverse that first pwm signal and second pwm signal are applied separately to described first by the PWM modulation signal
Become on unit and second inversion unit；
The first end of the capacitor cell is connect with the output end of the rectifier power source, second end and the first inversion list
The input terminal of member, the input terminal of second inversion unit are all connected with；
The output end of first inversion unit is connect with first load；
The output end of second inversion unit is connect with second load.
Preferably, the rectifier power source specifically includes AC power source and uncontrollable rectifier unit.
Preferably, the rectifier power source specifically includes three-phase alternating-current supply and three-phase uncontrollable rectifier unit.
Preferably, the rectifier power source is specially power battery.
Preferably, the first motor and second motor are specially synchronous motor and/or asynchronous machine and/or double fixed
Sub- winding electric machine.
The invention discloses a kind of PWM methods for inhibiting bus current ripple, are applied to two-in-one frequency converter, packet
It includes: obtaining default PWM modulation parameter；The first pwm signal and the second pwm signal, institute are determined according to the default PWM modulation parameter
The phase difference for stating the first pwm signal and second pwm signal is that preset phase is poor, so that first pwm signal is corresponding
First bus current and corresponding second bus current of second pwm signal are not overlapped；Respectively by first pwm signal and
Second pwm signal is applied on the first inversion unit and the second inversion unit.Due to the first pwm signal in the present invention and
Two pwm signals have preset phase poor, therefore corresponding first bus current of the two and the second bus current are not overlapped, thus female
The peak value of line current is substantially reduced, and reduces current peak and the calorific value of bus capacitor unit, and capacitor design value reduces, system
Cost reduces.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of step flow chart for the PWM method for inhibiting bus current ripple in the embodiment of the present invention；
Fig. 2 is bus current waveform diagram when single inversion unit works；
Bus current waveform diagram when Fig. 3 is two inversion unit work in the embodiment of the present invention；
Fig. 4 is a kind of structure distribution figure for the PWM modulation system for inhibiting bus current ripple in the embodiment of the present invention；
Fig. 5 is a kind of circuit topology figure for the two-in-one frequency converter for inhibiting bus current ripple in the embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
In certain industries, a frequency converter needs while controlling two inversion units, so that it be made respectively to export accordingly
Inverter current is motor power supply.If motor work at this time, under full load conditions, the peak value of bus current ripple can be more inverse than single
Becoming much larger when cell operation, current fluctuation amplitude becomes larger, while the current peak on capacitor increases, and capacitor fever is bigger,
Generate security risk.Have preset phase poor by the first pwm signal in this present embodiment and the second pwm signal, therefore the two is right
The first bus current and the second bus current answered are not overlapped, so that the peak value of bus current is substantially reduced, reduce bus electricity
Hold current peak and the calorific value of unit, capacitor design value reduces, and system cost reduces.
The embodiment of the invention discloses a kind of PWM methods for inhibiting bus current ripple, are applied to two-in-one frequency conversion
Device, it is shown in Figure 1, comprising:
S1: default PWM modulation parameter is obtained；
S2: the first pwm signal and the second pwm signal, the first PWM letter are determined according to the default PWM modulation parameter
It number is that preset phase is poor with the phase difference of second pwm signal, so that corresponding first bus current of first pwm signal
The second bus current corresponding with second pwm signal is not overlapped；
S3: first pwm signal and second pwm signal are applied to the first inversion unit and the second inversion respectively
On unit.
In general, the PWM method in the present embodiment is by DSP (Digital Signal Processing, digital signal
Processor), MCU (Micro Control Unit, micro-control unit) or FPGA (Field-Programmable Gate
Array, field programmable gate array) it realizes, the carrier frequency of the first pwm signal and the second pwm signal is identical, PWM module
Clock is identical.
It is understood that voltage vector is obtained by the switching vector selector near two, is opened in difference in SVPWM modulation
During closing vectors switching, it is reflected in bus bar side, really inversion unit has carried out energy friendship by bus and rectifier power source
Change, the corresponding bus current waveform of single inversion unit as shown in Fig. 2, when two inversion unit common bus, bus current
Ripple can be multiplied.
In view of the presence of zero vector, electric current only flows between inversion unit and motor, will not generate to bus current
It influences.If changing the position of the zero vector of the second inversion unit, in the zero vector position of the first inversion unit, control second is inverse
The non-zero vector for becoming unit, can thus avoid extracting DC current from bus simultaneously, by the extraction of bus current from list
Pure superposition becomes to assign on different time points, to inhibit the ripple of bus current.To change the second inversion unit
Zero vector action time point, under modulation system unanimous circumstances, simplest method is exactly to make two groups of inversion unit carrier waves
Phase difference is generated, to realize effect in the present embodiment: the first pwm signal and the second pwm signal modulated in the present embodiment, it is right
Two bus currents answering are simultaneously underlapped, and the corresponding bus current waveform by common bus can be as shown in figure 3, preset phase in figure
Potential difference is a quarter of predetermined period, and Idc1 is the first bus current, and Idc2 is the second bus current.
Specifically, preset phase difference can be calculated according to default PWM modulation parameter, then determine that one can make the
Continuous preset phase is poor just for one bus current and the second bus current, and bus current is continuous from previous bus current at this time
To the latter bus current, centre does not drop to zero, and pulse ripple amplitude is small, minimum to the damage of circuit devcie.
But, it is contemplated that control precision, the first bus current of general warranty and the second bus current are not overlapped, into
One step, it is contemplated that control precision and calculation amount can directly set preset phase difference to a quarter of predetermined period,
I.e. the carrier phase of the first pwm signal is exceeded the time limit or lag Ts/4 phase compared to the second pwm signal, and wherein Ts is predetermined period.In advance
If phase difference is Ts/4, without the concern for the influence of other parameters, do not need to be calculated according to these parameters yet, it will be able to
Utmostly guarantee that the first bus current and the second bus current are not overlapped or overlapping range is minimum, most to the damage of circuit element
It is small.
The embodiment of the invention discloses a kind of PWM methods for inhibiting bus current ripple, are applied to two-in-one frequency conversion
Device, comprising: obtain default PWM modulation parameter；The first pwm signal and the 2nd PWM letter are determined according to the default PWM modulation parameter
Number, the phase difference of first pwm signal and second pwm signal is that preset phase is poor, so that first pwm signal pair
The first bus current and corresponding second bus current of second pwm signal answered are not overlapped；The first PWM is believed respectively
Number and second pwm signal be applied on the first inversion unit and the second inversion unit.Believed by the first PWM in this present embodiment
Number and the second pwm signal have preset phase poor, therefore corresponding first bus current of the two and the second bus current are not overlapped,
To which the peak value of bus current is substantially reduced, current peak and the calorific value of capacitor cell are reduced, capacitor design value reduces, and is
Cost of uniting reduces.
Correspondingly, being applied to two the embodiment of the invention also discloses a kind of PWM modulation system for inhibiting bus current ripple
Unify frequency converter, it is shown in Figure 4, comprising:
Parameter module 01, for obtaining default PWM modulation parameter；
Signaling module 02, for determining the first pwm signal and the second pwm signal, institute according to the default PWM modulation parameter
The phase difference for stating the first pwm signal and second pwm signal is that preset phase is poor, so that first pwm signal is corresponding
First bus current and corresponding second bus current of second pwm signal are not overlapped；
Action module 03, for first pwm signal and second pwm signal to be applied to the first inversion list respectively
In member and the second inversion unit.
In some preferred embodiments, the preset phase difference is a quarter of predetermined period.
Have preset phase poor by the first pwm signal in this present embodiment and the second pwm signal, therefore the two corresponding the
One bus current and the second bus current are not overlapped, so that the peak value of bus current is substantially reduced, reduce the electricity of capacitor cell
Stream peak value and calorific value, capacitor design value reduce, and system cost reduces.
Correspondingly, being applied to two the embodiment of the invention also discloses a kind of PWM modulation device for inhibiting bus current ripple
Unify frequency converter, comprising:
Memory, for storing modulation program；
Processor realizes the PWM modulation for inhibiting bus current ripple as described above when for executing the modulation program
The step of method.
Wherein, in relation to the content of PWM method in the present embodiment, the associated description being referred in foregoing embodiments,
Details are not described herein again.
Have preset phase poor by the first pwm signal in this present embodiment and the second pwm signal, therefore the two corresponding the
One bus current and the second bus current are not overlapped, so that the peak value of bus current is substantially reduced, reduce bus capacitor unit
Current peak and calorific value, capacitor design value reduce, system cost reduce.
Correspondingly, the embodiment of the invention also discloses a kind of two-in-one frequency converters for inhibiting bus current ripple, referring to Fig. 5
It is shown, the PWM modulation device 11 including inhibiting bus current ripple as described above, rectifier power source 12, capacitor cell C, first
Inversion unit U1, the second inversion unit U2, the first load M1, the second load M2, in which:
It is inverse that first pwm signal and second pwm signal are applied separately to described first by the PWM modulation signal
Become on unit U1 and the second inversion unit U2；
The first end of the capacitor cell C is connect with the output end of the rectifier power source 12, second end and described first inverse
The input terminal of the input terminal, the second inversion unit U2 that become unit U1 is all connected with；
The output end of the first inversion unit U1 is connect with the first load M1；
The output end of the second inversion unit U2 is connect with the second load M2.
Wherein, the specific content in relation to PWM modulation device 11, the associated description being referred in foregoing embodiments, herein
It repeats no more.
It is understood that the present embodiment has beneficial effect identical with PWM modulation device in foregoing embodiments, herein
It repeats no more.
Wherein, in the present embodiment capacitor cell as bus capacitor.
In some preferred embodiments, the rectifier power source 12 specifically includes AC power source V and uncontrollable rectifier unit U3.
Further, the rectifier power source 12 specifically includes three-phase alternating-current supply V and three-phase uncontrollable rectifier unit U3, this reality
Fig. 5 is applied in example just as example.
Certainly, rectifier power source 12 is also possible to two-phase uncontrollable rectifier unit or other rectification units and the rectification unit
Corresponding AC power source；
In addition to this, the rectifier power source 12 or power battery directly export DC voltage to capacitor cell C.By
The ripple of bus current is inhibited in this present embodiment, and power battery maximum discharge current can also reduce, thus power battery
Service life promoted.
Further, the first motor M1 and the second motor M2 be specially synchronous motor and/or asynchronous machine and/
Or bimorph transducer winding electric machine.That is, first motor M1 and the second motor M2, can be two asynchronous machines, is also possible to
Two synchronous motors are also possible to two bimorph transducer winding electric machines, can also be synchronous motor and/or asynchronous machine, bimorph transducer
Any two kinds of combination in winding electric machine.
It should be noted that there is no the types to rectifier power source 12 and first motor M1, the second motor M2 for the present embodiment
Make limitation, the component of the technical effect of any achievable the present embodiment, circuit topology are in the protection scope of the present embodiment
It is interior.
Finally, it is to be noted that, herein, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes that
A little elements, but also including other elements that are not explicitly listed, or further include for this process, method, article or
The intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence "including a ...", is not arranged
Except there is also other identical elements in the process, method, article or apparatus that includes the element.
Above to a kind of PWM method, system and associated component for inhibiting bus current ripple provided by the present invention
It is described in detail, used herein a specific example illustrates the principle and implementation of the invention, the above reality
The explanation for applying example is merely used to help understand method and its core concept of the invention；Meanwhile for the general technology of this field
Personnel, according to the thought of the present invention, there will be changes in the specific implementation manner and application range, in conclusion this theory
Bright book content should not be construed as limiting the invention.
Claims (10)
1. a kind of PWM method for inhibiting bus current ripple, which is characterized in that be applied to two-in-one frequency converter, comprising:
Obtain default PWM modulation parameter；
Determine the first pwm signal and the second pwm signal according to the default PWM modulation parameter, first pwm signal with it is described
The phase difference of second pwm signal is that preset phase is poor, so that corresponding first bus current of first pwm signal and described the
Corresponding second bus current of two pwm signals is not overlapped；
First pwm signal and second pwm signal are applied on the first inversion unit and the second inversion unit respectively.
2. PWM method according to claim 1, which is characterized in that the preset phase difference is four points of predetermined period
One of.
3. a kind of PWM modulation system for inhibiting bus current ripple, which is characterized in that be applied to two-in-one frequency converter, comprising:
Parameter module, for obtaining default PWM modulation parameter；
Signaling module, for determining the first pwm signal and the second pwm signal according to the default PWM modulation parameter, described first
The phase difference of pwm signal and second pwm signal is that preset phase is poor, so that corresponding first mother of first pwm signal
Line current and corresponding second bus current of second pwm signal are not overlapped；
Action module, for first pwm signal and second pwm signal to be applied to the first inversion unit and respectively
On two inversion units.
4. PWM modulation system according to claim 3, which is characterized in that the preset phase difference is four points of predetermined period
One of.
5. a kind of PWM modulation device for inhibiting bus current ripple, which is characterized in that be applied to two-in-one frequency converter, comprising:
Memory, for storing modulation program；
Processor is realized when for executing the modulation program and inhibits bus current ripple as described in any one of claims 1 or 2
PWM method the step of.
6. a kind of two-in-one frequency converter for inhibiting bus current ripple, which is characterized in that including inhibiting female as claimed in claim 5
The PWM modulation device of line current ripple, rectifier power source, capacitor cell, the first inversion unit, the second inversion unit, the first load,
Second load, in which:
First pwm signal and second pwm signal are applied separately to the first inversion list by the PWM modulation signal
On first and described second inversion unit；
The first end of the capacitor cell is connect with the output end of the rectifier power source, second end and first inversion unit
Input terminal, second inversion unit input terminal be all connected with；
The output end of first inversion unit is connect with first load；
The output end of second inversion unit is connect with second load.
7. two-in-one frequency converter according to claim 6, which is characterized in that the rectifier power source specifically include AC power source and
Uncontrollable rectifier unit.
8. two-in-one frequency converter according to claim 7, which is characterized in that the rectifier power source specifically includes three-phase alternating current
Source and three-phase uncontrollable rectifier unit.
9. two-in-one frequency converter according to claim 6, which is characterized in that the rectifier power source is specially power battery.
10. according to any one of claim 6 to the 9 two-in-one frequency converter, which is characterized in that the first motor and described the
Two motors are specially synchronous motor and/or asynchronous machine and/or bimorph transducer winding electric machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910702215.0A CN110401333A (en) | 2019-07-31 | 2019-07-31 | Inhibit PWM method, system and the associated component of bus current ripple |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910702215.0A CN110401333A (en) | 2019-07-31 | 2019-07-31 | Inhibit PWM method, system and the associated component of bus current ripple |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112003502A (en) * | 2020-09-14 | 2020-11-27 | 苏州汇川技术有限公司 | Carrier phase-shifting control method and system and automobile motor controller |
| CN112564516A (en) * | 2020-11-03 | 2021-03-26 | 深圳市禾望电气股份有限公司 | Converter control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102386843A (en) * | 2010-08-27 | 2012-03-21 | 株式会社电装 | Electric power converter, driving apparatus and electric power steering apparatus |
| US20120075900A1 (en) * | 2009-06-09 | 2012-03-29 | Honda Motor Co., Ltd. | Controller for load drive system |
| CN207251482U (en) * | 2017-08-18 | 2018-04-17 | 深圳市汇川技术股份有限公司 | Air compressor machine all-in-one machine frequency converter and air compressor system |
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2019
- 2019-07-31 CN CN201910702215.0A patent/CN110401333A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120075900A1 (en) * | 2009-06-09 | 2012-03-29 | Honda Motor Co., Ltd. | Controller for load drive system |
| CN102386843A (en) * | 2010-08-27 | 2012-03-21 | 株式会社电装 | Electric power converter, driving apparatus and electric power steering apparatus |
| CN207251482U (en) * | 2017-08-18 | 2018-04-17 | 深圳市汇川技术股份有限公司 | Air compressor machine all-in-one machine frequency converter and air compressor system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112003502A (en) * | 2020-09-14 | 2020-11-27 | 苏州汇川技术有限公司 | Carrier phase-shifting control method and system and automobile motor controller |
| CN112564516A (en) * | 2020-11-03 | 2021-03-26 | 深圳市禾望电气股份有限公司 | Converter control method |
| CN112564516B (en) * | 2020-11-03 | 2022-03-22 | 深圳市禾望电气股份有限公司 | Converter control method |
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Application publication date: 20191101 |