CN106849721A - The synchronous method and apparatus of shunt chopper carrier signal - Google Patents
The synchronous method and apparatus of shunt chopper carrier signal Download PDFInfo
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- CN106849721A CN106849721A CN201710093742.7A CN201710093742A CN106849721A CN 106849721 A CN106849721 A CN 106849721A CN 201710093742 A CN201710093742 A CN 201710093742A CN 106849721 A CN106849721 A CN 106849721A
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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
- H02M7/493—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 the static converters being arranged for operation in parallel
-
- 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
Abstract
The invention provides a kind of synchronous method and apparatus of shunt chopper carrier signal, wherein, the synchronous method of shunt chopper carrier signal includes：The corresponding synchronizing signal of each inverter in shunt chopper is obtained, the phase of the synchronizing signal of each above-mentioned inverter is identical；Treatment is synchronized to the carrier signal of each above-mentioned inverter according to the corresponding synchronizing signal of above-mentioned inverter.Carrier signal is synchronous with synchronizing signal during the method for the shunt chopper carrier signal synchronization that the present invention is provided controls each inverter in parallel by way of software synchronization algorithm, because the synchronizing signal of each shunt chopper is same phase, so by the way that carrier signal in each inverter in parallel is synchronous with respective synchronizing signal, just causing the synchronization of carrier signal in each inverter in parallel.The synchronous method of shunt chopper carrier signal that the present invention is provided overcomes that carrier signal synchronous effect in the prior art is poor, the problem of the reliability of influence power converting system performance.
Description
Technical field
The present invention relates to electronic circuit field, more particularly to a kind of synchronous method of shunt chopper carrier signal and dress
Put.
Background technology
With developing rapidly for the information processing technology, capacity and power converting system dependable performance to power converting system
The requirement more and more higher of property.For the demand that the capacity for meeting power converting system increases, can be by power converting system
Wired in parallel, such as by inverter parallel.It is normal that inverter generates control inverter itself by carrier signal and reference voltage
The control wave of operation, if the carrier signal between the inverter of parallel connection is asynchronous, produces between inverter in parallel
Raw control wave is asynchronous, and then, the current harmonics and/or voltage harmonic of the inverter output of parallel connection can be caused to increase
Greatly, the stability of the alternating current of influence inverter output.
The carrier signal synchronous method of existing shunt chopper is that each inverter in parallel is passed through into connection (example
Such as netting twine) it is connected with a synchronizer, after synchronizer synchronizes the carrier signal of each inverter in parallel, then pass through
Carrier signal after synchronization is sent to each inverter by above-mentioned connection so that in shunt chopper each inverter it
Between carrier signal synchronization.
However, causing the synchronous method of the carrier signal between the inverter of parallel connection by connection, the inverse of parallel connection is influenceed
The synchronous effect of carrier signal between change device, and then influence the reliability of power converting system performance.
The content of the invention
It is inverse to solve existing parallel connection the invention provides a kind of synchronous method and apparatus of shunt chopper carrier signal
Carrier signal synchronous effect is poor in becoming the synchronous method of device carrier signal, and the reliability of influence power converting system performance is asked
Topic.
The present invention provides a kind of shunt chopper carrier signal synchronous method, including：
Obtain the corresponding synchronizing signal of each inverter, the phase of the synchronizing signal of each above-mentioned inverter in shunt chopper
Position is identical；
Treatment is synchronized to the carrier signal of each above-mentioned inverter according to the corresponding synchronizing signal of above-mentioned inverter.
Optionally, it is above-mentioned the carrier signal of each above-mentioned inverter is carried out according to above-mentioned inverter corresponding synchronizing signal
Synchronization process, including：
Obtain the phase of the carrier signal of above-mentioned inverter and the phase of corresponding synchronizing signal；
Determine whether the phase of above-mentioned carrier signal is identical with the phase of above-mentioned synchronizing signal；
If the phase of above-mentioned carrier signal is different from the phase of above-mentioned synchronizing signal, the cycle of above-mentioned carrier signal is adjusted
Value.
Optionally, if the phase of above-mentioned carrier signal is different from the phase of above-mentioned synchronizing signal, above-mentioned load is adjusted
The periodic quantity of ripple signal, including:
If the phase of the advanced above-mentioned synchronizing signal of the phase of above-mentioned carrier signal, increases the cycle of above-mentioned carrier signal
Value；
If the phase of the advanced above-mentioned carrier signal of the phase of above-mentioned synchronizing signal, reduces the cycle of above-mentioned carrier signal
Value.
Optionally, the corresponding synchronizing signal of each inverter in above-mentioned acquisition shunt chopper, including：
The zero crossing of three-phase input voltage is detected using PHASE-LOCKED LOOP PLL TECHNIQUE, the zero crossing letter of above-mentioned three-phase input voltage is determined
Number be above-mentioned synchronizing signal.
The present invention also provides a kind of shunt chopper carrier signal synchronous device, including：
Detector, for obtaining the corresponding synchronizing signal of each inverter in shunt chopper, each above-mentioned inverter
The phase of synchronizing signal is identical；
Controller, for being carried out to the carrier signal of each above-mentioned inverter according to the corresponding synchronizing signal of above-mentioned inverter
Synchronization process.
Optionally, controller noted above is specifically for the phase for obtaining the carrier signal of above-mentioned inverter and corresponding synchronization
The phase of signal；Determine whether the phase of above-mentioned carrier signal is identical with the phase of above-mentioned synchronizing signal；If above-mentioned carrier signal
Phase it is different from the phase of above-mentioned synchronizing signal, then adjust the periodic quantity of above-mentioned carrier signal.
Optionally, if controller noted above specifically for the advanced above-mentioned synchronizing signal of phase of above-mentioned carrier signal phase,
Then increase the periodic quantity of above-mentioned carrier signal；If the phase of the advanced above-mentioned carrier signal of the phase of above-mentioned synchronizing signal, reduces
The periodic quantity of above-mentioned carrier signal.
Optionally, above-mentioned detector detects the zero crossing of three-phase input voltage specifically for use PHASE-LOCKED LOOP PLL TECHNIQUE, it is determined that
The crossover point signal of above-mentioned three-phase input voltage is above-mentioned synchronizing signal.
The method and apparatus of the shunt chopper carrier signal synchronization that the present invention is provided, wherein, shunt chopper carrier wave letter
The method of number synchronization includes：Obtain shunt chopper in the corresponding synchronizing signal of each inverter, each above-mentioned inverter it is same
The phase for walking signal is identical；The carrier signal of each above-mentioned inverter is carried out together according to above-mentioned inverter corresponding synchronizing signal
Step treatment.The method of the shunt chopper carrier signal synchronization that the present invention is provided controls each by way of software synchronization algorithm
Carrier signal is synchronous with synchronizing signal in inverter in parallel, because the synchronizing signal of each shunt chopper is same phase, institute
By the way that carrier signal in each inverter in parallel is synchronous with respective synchronizing signal, just to cause each inverter in parallel
The synchronization of middle carrier signal, and then the synchronization of control wave in each inverter in parallel is caused, be conducive to improving power supply
The reliability of converting system performance.The method of the shunt chopper carrier signal synchronization that the present invention is provided overcomes in the prior art
Carrier signal synchronous effect is poor, influences the problem of the reliability of power converting system performance.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description does one and simply introduces, it should be apparent that, drawings in the following description are this hairs
Some bright embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can be with root
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the shunt chopper usage scenario figure of the synchronous method and apparatus of shunt chopper carrier signal of the present invention；
Fig. 2 is the schematic flow sheet of the synchronous method of shunt chopper carrier signal of the present invention；
The schematic diagram of the generation synchronizing signal that Fig. 3 is provided for the present invention；
Fig. 4 is the another schematic diagram of the synchronous method of shunt chopper carrier signal of the present invention；
Fig. 5 is another schematic flow sheet of the synchronous method of shunt chopper carrier signal of the present invention；
Fig. 6 is another schematic flow sheet of the synchronous method of shunt chopper carrier signal of the present invention；
Fig. 7 a are the waveform diagram of the synchronous method of shunt chopper carrier signal of the present invention；
Fig. 7 b are the another waveform diagram of the synchronous method of shunt chopper carrier signal of the present invention；
Fig. 7 c are another waveform diagram of the synchronous method of shunt chopper carrier signal of the present invention；
Fig. 8 is the structural representation of the synchronous device of shunt chopper carrier signal of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Term " first ", " second ", " the 3rd " in description and claims of this specification and above-mentioned accompanying drawing and/or
(if present)s such as " the 4 " is for distinguishing similar object, without for describing specific order or precedence.Should
The data that the understanding is so used can be exchanged in the appropriate case, so as to embodiments of the invention described herein, for example can
Enough orders with addition to those for illustrating herein or describing are implemented.Additionally, term " comprising " and " having " and they
Any deformation, it is intended that covering is non-exclusive to be included, for example, containing the process of series of steps or unit, method, being
System, product or equipment are not necessarily limited to those steps or the unit clearly listed, but may include not list clearly or
For these processes, method, product or other intrinsic steps of equipment or unit.
The method of the shunt chopper carrier signal synchronization that the present invention is provided is controlled often by way of software synchronization algorithm
Carrier signal is synchronous with synchronizing signal in individual inverter in parallel, because the synchronizing signal of each shunt chopper is same phase,
So by the way that carrier signal in each inverter in parallel is synchronous with respective synchronizing signal, just causing each inversion in parallel
The synchronization of carrier signal in device, and then cause the synchronization of control wave in each inverter in parallel.What the present invention was provided
It is poor that the synchronous method of shunt chopper carrier signal overcomes carrier signal synchronous effect in the prior art, influences power conversion system
The problem of the reliability of performance of uniting.
The present invention is described in detail with specifically embodiment below providing to technical scheme.This is several below
Individual specific embodiment can be combined with each other, and may no longer be gone to live in the household of one's in-laws on getting married in some embodiments for same or analogous concept or process
State.
Embodiment one
Fig. 1 is the shunt chopper usage scenario figure of the synchronous method and apparatus of shunt chopper carrier signal of the present invention,
In order in the increase for meeting power converting system capacity, with reference to Fig. 1, by the inverter 1 in power conversion system and inverter 2 simultaneously
Connection (quantity of shunt chopper is not limited in the present invention, is illustrated by taking two inverter parallels as an example in the present embodiment),
The alternating current that each inverter is produced in shunt chopper is by after transformer, by ac filter capacitor filtering, then passing through and connecing
Three-phase alternating current bus is reached after tentaculum.
Fig. 2 is the schematic flow sheet of the synchronous method of shunt chopper carrier signal of the present invention.In order to adapt to power conversion
Power system capacity becomes big, it is necessary to the inverter of power source change internal system carried out into parallel connection, and the shunt chopper that the present invention is provided
The synchronization of the carrier signal that the synchronous method of carrier signal is used between inverter in parallel, with reference to Fig. 2, it is that the present invention is provided and
The synchronous method of connection inverter carrier signal includes：
Step 101：Obtain the corresponding synchronizing signal of each inverter, the synchronization of each inverter in shunt chopper
The phase of signal is identical.
Specifically, with reference to Fig. 1, because the alternating current of each inverter output in shunt chopper is by respective transformer
After boosting, ac filter capacitor filtering and receiver, ac bus are reached, so the above-mentioned synchronizing signal of shunt chopper
Can be obtained by three-phase alternating current bus U phase voltages, the synchronizing signal obtained by three-phase alternating current bus U phase voltages is inverse for parallel connection
It is identical for each inverter to become in device.
Optionally, as a kind of producing method of synchronizing signal, the principle of the generation synchronizing signal that Fig. 3 is provided for the present invention
Figure, specifically, producing the original of synchronizing signal in the method for the shunt chopper carrier signal synchronization that Fig. 3 contents are the present invention to be provided
Reason figure.With reference to Fig. 3, the zero crossing of the three-phase alternating current busbar voltage of input is detected using PHASE-LOCKED LOOP PLL TECHNIQUE, obtain the zero of voltage
After point signal, in this, as the carrier signal synchronizing signal of each shunt chopper.
Specifically, first, changes in coordinates, root are carried out to three-phase alternating current bus U phase voltages and three-phase alternating current bus V phase voltages
The d axle component Ud and q axle components Uq under rotating coordinate system is obtained according to changes in coordinates formula such as formula (1), (2)；Secondly, Uq is through locking phase
PI controllers are adjusted during to zero in ring, and lock phase output angle θ, the i.e. phase with U cross streams busbar voltages is identical.
Step 102：The carrier signal of inverter each described is carried out together according to the inverter corresponding synchronizing signal
Step treatment.
Specifically, controller obtains control wave according to carrier signal and reference voltage in inverter, in the present invention
In, carrier signal and corresponding synchronizing signal were carried out same getting along by the controller of inverter before control wave is obtained
Reason so that pulse width modulation (Pulse Width Modulation；Referred to as：PWM) zero crossing of carrier signal and synchronous letter
Number rising edge alignment, and then cause that carrier signal is synchronized with corresponding synchronizing signal.Because each is inverse in shunt chopper
It is same phase to become the corresponding synchronizing signal of device, so, each inverter carrier signal and corresponding synchronous letter in shunt chopper
After number synchronization, each inverter carrier signal obtains synchronization in shunt chopper.
Optionally, Fig. 4 is the schematic diagram of the synchronous method of shunt chopper carrier signal of the present invention, and with reference to Fig. 4, three intersect
Stream bus U phase voltages obtain each self-corresponding synchronizing signal, example by each inverter in shunt chopper by phaselocked loop
Such as, three-phase alternating current bus U phase voltages obtain synchronizing signal 1 by phaselocked loop 1.The synchronizing signal of above-mentioned generation is used for parallel inverter
Each inverter synchronizes treatment to each self-corresponding carrier signal in device, wherein, inverter is by synchronized algorithm to carrier wave
Signal carries out the synchronization process with synchronizing signal.For example, inverter by synchronized algorithm 1 its carrier signal PWM01 is carried out with
The synchronization process of synchronizing signal 1, obtains the carrier signal PWM1 after synchronization process.
Fig. 5 is another schematic flow sheet of the synchronous method of shunt chopper carrier signal of the present invention.Optionally, step
102 can include：
Step 1021：Obtain the phase of the carrier signal of the inverter and the phase of corresponding synchronizing signal.
A kind of specific implementation, with reference to Fig. 4, in shunt chopper each inverter obtain the phase of carrier signal with
And the phase of corresponding synchronizing signal, for example, inverter 1 is when algorithm 1 is synchronized, obtain the phase of carrier signal PWM01
And the phase of synchronizing signal 1.
Step 1022：Determine whether the phase of the carrier signal is identical with the phase of the synchronizing signal.
Step 1023：If the phase of the carrier signal is different from the phase of the synchronizing signal, the carrier wave is adjusted
The periodic quantity of signal.
Specifically, the phase of carrier signal includes with the phase difference of synchronizing signal：The phase of carrier signal is synchronous in advance
The phase of signal and the phase of carrier signal fall behind two kinds of situations of phase of synchronizing signal.The phase of carrier signal is same with corresponding
When walking the phase difference of signal, the periodic quantity of carrier signal is adjusted by synchronized algorithm.
Fig. 6 is another schematic flow sheet of the synchronous method of shunt chopper carrier signal of the present invention, and Fig. 6 includes inverter
Synchronized algorithm the step of, with reference to Fig. 6, optionally, after step 1023, the shunt chopper carrier signal that the present invention is provided
Synchronous method also include：
Step 1024, the phase of the whether advanced synchronizing signal of phase of the carrier signal.
If so, then performing step 1025, increase the periodic quantity of the carrier signal.
Used as a kind of enforceable mode, Fig. 7 a are that the waveform of the synchronous method of shunt chopper carrier signal of the present invention shows
It is intended to.When Fig. 7 a contents are inverter carrier signal advanced synchronizing signals, the waveform diagram of carrier signal and synchronizing signal, figure
As a example by treatment is synchronized to carrier signal PWM01, with reference to Fig. 7 a, the wherein phase of inverter carrier signal PWM01 surpasses 7a
The phase (T2-T1) of preamble 1, then inverter by gradually adjustment carrier signal cycle by T1 to T2, until carrier wave
The rising edge zero crossing of signal, obtains the carrier signal PWM1 synchronous with synchronizing signal 1.
If it is not, then performing step 1026, reduce the periodic quantity of the carrier signal.
Used as a kind of enforceable mode, Fig. 7 b are another ripple of the synchronous method of shunt chopper carrier signal of the present invention
Shape schematic diagram.When Fig. 7 b contents are that inverter carrier signal falls behind synchronizing signal, carrier signal is illustrated with the waveform of synchronizing signal
Figure, Fig. 7 b by carrier signal PWM02 is synchronized treatment as a example by, with reference to Fig. 7 b, the wherein phase of inverter carrier signal PWM02
Position falls behind the phase (T3-T4) of synchronizing signal 2, then inverter by the cycle of gradually adjustment carrier signal by T3 to T4, until
The rising edge zero crossing of carrier signal, obtains the carrier signal PWM2 synchronous with synchronizing signal 2.
Optionally, can be realized together by the carrier signal after above-mentioned synchronized algorithm step 1025 and step 1026 adjustment
Step, for example, it is synchronous with carrier signal PWM2 to realize carrier signal PWM1.
Fig. 7 c are another waveform diagram of the synchronous method of shunt chopper carrier signal of the present invention.The content of Fig. 7 c is
The oscillogram of carrier signal and control wave, with reference to Fig. 7 c, optionally, carrier signal PWM1 and carrier signal after adjustment
The equal zero crossing of rising edge of PWM2, it is synchronous with synchronizing signal, and then carrier signal PWM1 and carrier signal PWM2 after adjustment
It is synchronous.Also, the control wave 1 for being obtained by the carrier signal PWM1 and carrier signal PWM2 after adjustment respectively and control
Pulse signal 2 is also synchronous.And then, the current harmonics and/or voltage harmonic of shunt chopper output are reduced, be conducive to inverter defeated
The improvement of the exchange electricity quality for going out.
Fig. 8 is the structural representation of the synchronous device of shunt chopper carrier signal of the present invention, with reference to Fig. 8, parallel inverter
The synchronous device of device carrier signal includes：Detector 201 and controller 202.
Wherein, detector 201 is used to obtain the corresponding synchronizing signal of each inverter in shunt chopper, and each is described inverse
The phase for becoming the synchronizing signal of device is identical.
Controller 202 is used to enter the carrier signal of inverter each described according to the corresponding synchronizing signal of the inverter
Row synchronization process.
Optionally, phase and corresponding synchronizing signal of the controller 202 specifically for the carrier signal of acquisition inverter
Phase；Determine whether the phase of carrier signal is identical with the phase of synchronizing signal；If the phase and synchronizing signal of carrier signal
Phase it is different, then adjust the periodic quantity of carrier signal.
Optionally, if the implement body of controller 202 is used for the phase of the advanced synchronizing signal of phase of carrier signal, increase is carried
The periodic quantity of ripple signal；If the phase of the advanced carrier signal of the phase of synchronizing signal, the periodic quantity of carrier signal is reduced.
Optionally, detector 201 determines three specifically for the zero crossing using PHASE-LOCKED LOOP PLL TECHNIQUE detection three-phase input voltage
The crossover point signal of phase input voltage is synchronizing signal.
The synchronous method and apparatus of shunt chopper carrier signal are present embodiments provided, wherein, shunt chopper carrier wave
In the synchronous method of signal, each inverter is obtained together by PHASE-LOCKED LOOP PLL TECHNIQUE by three-phase alternating current bus in shunt chopper first
Step signal, the synchronizing signal that each inverter is obtained is same phase；Then, each inverter is believed its carrier wave by synchronized algorithm
Number synchronize treatment with corresponding synchronizing signal, and then cause the carrier signal synchronization of each inverter in shunt chopper,
Be conducive to improving the reliability of power converting system performance.The method of the shunt chopper carrier signal synchronization that the present invention is provided is led to
To cross the synchronized algorithm of software carry out the synchronization of carrier signal, it is to avoid realizes that carrier wave is believed by the connection of hardware in the prior art
The shortcoming of the synchronous effect difference produced during number synchronization.In addition, in shunt chopper each inverter carrier signal synchronization, may be used also
With the generation of high frequency circulating currents between the filter capacitor for avoiding parallel connection, be conducive to extending the service life of filter capacitor.
Finally it should be noted that：Various embodiments above is merely illustrative of the technical solution of the present invention, rather than its limitations；To the greatest extent
Pipe has been described in detail with reference to foregoing embodiments to the present invention, it will be understood by those within the art that：Its according to
The technical scheme described in foregoing embodiments can so be modified, or which part or all technical characteristic are entered
Row equivalent；And these modifications or replacement, the essence of appropriate technical solution is departed from various embodiments of the present invention technology
The scope of scheme.
Claims (8)
1. a kind of synchronous method of shunt chopper carrier signal, it is characterised in that including：
Obtain the corresponding synchronizing signal of each inverter, the phase phase of the synchronizing signal of each inverter in shunt chopper
Together；
Treatment is synchronized to the carrier signal of inverter each described according to the corresponding synchronizing signal of the inverter.
2. method according to claim 1, it is characterised in that it is described according to the corresponding synchronizing signal of the inverter to every
The carrier signal of the individual inverter synchronizes treatment, including：
Obtain the phase of the carrier signal of the inverter and the phase of corresponding synchronizing signal；
Determine whether the phase of the carrier signal is identical with the phase of the synchronizing signal；
If the phase of the carrier signal is different from the phase of the synchronizing signal, the periodic quantity of the carrier signal is adjusted.
3. method according to claim 2, it is characterised in that if the phase of the carrier signal and the synchronous letter
Number phase it is different, then adjust the periodic quantity of the carrier signal, including:
If the phase of the advanced synchronizing signal of the phase of the carrier signal, increases the periodic quantity of the carrier signal；
If the phase of the advanced carrier signal of the phase of the synchronizing signal, reduces the periodic quantity of the carrier signal.
4. the method according to claim any one of 1-3, it is characterised in that each inversion in the acquisition shunt chopper
The corresponding synchronizing signal of device, including：
The zero crossing of three-phase input voltage is detected using PHASE-LOCKED LOOP PLL TECHNIQUE, the crossover point signal for determining the three-phase input voltage is
The synchronizing signal.
5. the synchronous device of a kind of shunt chopper carrier signal, it is characterised in that including：
Detector, for obtaining the corresponding synchronizing signal of each inverter, the synchronization of each inverter in shunt chopper
The phase of signal is identical；
Controller, for being synchronized to the carrier signal of inverter each described according to the corresponding synchronizing signal of the inverter
Treatment.
6. device according to claim 5, it is characterised in that the controller is specifically for obtaining the load of the inverter
The phase of the phase of ripple signal and corresponding synchronizing signal；Determine the phase of the carrier signal and the phase of the synchronizing signal
Whether position is identical；If the phase of the carrier signal is different from the phase of the synchronizing signal, the carrier signal is adjusted
Periodic quantity.
7. device according to claim 6, it is characterised in that if the controller is specifically for the phase of the carrier signal
The phase of the advanced synchronizing signal in position, then increase the periodic quantity of the carrier signal；If the phase of the synchronizing signal is advanced
The phase of the carrier signal, then reduce the periodic quantity of the carrier signal.
8. the device according to claim any one of 5-7, it is characterised in that the detector is specifically for using phaselocked loop
The zero crossing of technology for detection three-phase input voltage, the crossover point signal for determining the three-phase input voltage is the synchronizing signal.
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| EP3694099A1 (en) * | 2019-02-08 | 2020-08-12 | Deere & Company | System and method for frequency adjustment of parallel inverters coupled to a grid power source |
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| CN108377002A (en) * | 2018-05-09 | 2018-08-07 | 北京交通大学 | The switch subharmonic suppressing method and inverter parallel system of inverter parallel system |
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| CN114257074A (en) * | 2021-12-15 | 2022-03-29 | 中车长春轨道客车股份有限公司 | Inverter parallel switch circulating current suppression algorithm based on carrier phase synchronization |
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