CN108092533A - A kind of more level lossless absorption circuits and photovoltaic generating system - Google Patents
A kind of more level lossless absorption circuits and photovoltaic generating system Download PDFInfo
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- CN108092533A CN108092533A CN201711422222.2A CN201711422222A CN108092533A CN 108092533 A CN108092533 A CN 108092533A CN 201711422222 A CN201711422222 A CN 201711422222A CN 108092533 A CN108092533 A CN 108092533A
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- switch module
- diode
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- switching tube
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Classifications
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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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0038—Circuits or arrangements for suppressing, e.g. by masking incorrect turn-on or turn-off signals, e.g. due to current spikes in current mode control
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
An embodiment of the present invention provides a kind of more level lossless absorption circuits and photovoltaic generating systems, the lossless absorption circuit is applied to multi-level circuit, wherein, multi-level circuit includes first switch module and second switch module, first switch module is split structure with second switch module, and lossless absorption circuit includes：At least one absorbing circuit subelement, the absorbing circuit subelement is arranged between first switch module and second switch module, for absorbing the peak voltage that switching tube is generated in default operating condition in second switch module, and, in this programme, flying capacitor need not be increased, therefore the additional consume that flying capacitor is brought is avoided from root.
Description
Technical field
The present invention relates to technical field of new energy power generation, and in particular to a kind of more level lossless absorption circuits and photovoltaic hair
Electric system.
Background technology
In general, multi-level circuit, as shown in Figure 1, in order to balance the device loss of each switching tube and heat distribution, how electric this is
Multiple switch pipe in ordinary telegram road is optimized using the identical IGBT of model further for the performance of switch tube, is led to
Often using switching tube S2 and switching tube S3 as HF switch pipe, switching tube S1, switching tube S4, switching tube S5 and switching tube S6
As low frequency switch pipe.
In the application scenarios of relatively high power, for the ease of dismounting, more level topological structures in Fig. 1 are split into such as figure
Two-part structure shown in 2, when mounted, node P1 are connected with node P2, and node N1 is connected with node N2, however, the decomposition
Mode can cause switching tube S2 and switching tube S3 to generate larger due to voltage spikes in HF switch, influence entire inversion system
Reliability, equivalent circuit is as shown in Figure 3.
In general, in order to solve above-mentioned due to voltage spikes, as shown in figure 4, adding the electricity that suspends in node P2 and node N2
Hold Cf.However, it is found by the inventors that flying capacitor Cf meeting and loop inductance when switching tube S2 and switching tube S3 are switched on and off
Resonance is formed, and then brings additional loss.
Therefore, how a kind of more level lossless absorption circuits are provided, is switched on and off in switching tube S2 and switching tube S3
When, due to voltage spikes can be inhibited, and the additional consume that flying capacitor is avoided to bring, be those skilled in the art it is urgently to be resolved hurrily one
Big technical barrier.
The content of the invention
In view of this, an embodiment of the present invention provides a kind of more level lossless absorption circuits and photovoltaic generating systems.
To achieve the above object, the embodiment of the present invention provides following technical solution：
A kind of more level lossless absorption circuits, applied to multi-level circuit, the multi-level circuit includes first switch mould
Block and second switch module, the first switch module and the second switch module are split structure, the lossless suction
Receiving circuit includes：At least one absorbing circuit subelement,
The absorbing circuit subelement is arranged between the first switch module and the second switch module, for inhaling
Receive the peak voltage that switching tube is generated in default operating condition in the second switch module.
Optionally, the absorbing circuit subelement includes：First diode, the second diode and the first capacitance；
The anode of first diode is connected with the first end of the second switch module, the moon of first diode
Anode of the pole respectively with the first end of first capacitance and second diode is connected, the cathode of second diode
It is connected with the first end of the first switch module, the second end of the second end of first capacitance and the second switch module
It is connected.
Optionally, the lossless absorption circuit includes the first absorbing circuit subelement and the second absorbing circuit subelement,
The first absorbing circuit subelement includes：First diode, the second diode and the first capacitance；
The anode of first diode is connected with the first end of the second switch module, the moon of first diode
Anode of the pole respectively with the first end of first capacitance and second diode is connected, the cathode of second diode
It is connected with the first end of the first switch module, the second end of the second end of first capacitance and the second switch module
It is connected；
The second absorbing circuit subelement includes：3rd diode, the 4th diode and the second capacitance；
The cathode of 3rd diode is connected with the second end of the second switch module, the sun of the 3rd diode
Cathode of the pole respectively with the first end of second capacitance and the 4th diode is connected, the anode of the 4th diode
It is connected with the second end of the first switch module, the first end of the second end of second capacitance and the second switch module
It is connected.
Optionally, the switching tube is IGBT or MOSFET.
Optionally, further include：
The current-limiting circuit being serially connected between the first switch module and the second switch module, the current-limiting circuit is extremely
Include one or more of resistance, inductance impedance device less.
A kind of multi-level circuit, including first switch module, second switch module and be connected to first module with
And more level lossless absorption circuits that any one between second module is above-mentioned.
Optionally,
First switch pipe of the first switch module including concatenation, the 4th switching tube, the 5th switching tube and the 6th open
Guan Guan, the first end of the first end of the first switch pipe as the first switch module, the first of the 4th switching tube
Hold second end as the first switch module, the second end of the first switch pipe as the first switch module the
Three ends, for being connected with the first end of the second switch module, the second end of the 4th switching tube is opened as described first
The 4th end of module is closed, for being connected with the second end of the second switch module；
The second switch module includes the second switch pipe and the 3rd switching tube of concatenation, and the of the second switch pipe
First end of the one end as the second switch module, the first end of the 3rd switching tube is as the second switch module
Second end.
Optionally,
It further includes：Bus capacitor branch,
The bus capacitor branch and the first switch wired in parallel, and, the bus capacitor branch includes at least two
A capacitance.
Optionally,
It further includes：Inductive branch,
The inductive branch is arranged between the first switch module and the absorbing circuit subelement.
A kind of photovoltaic generating system, including the above-mentioned multi-level circuit of any one.
Based on above-mentioned technical proposal, an embodiment of the present invention provides a kind of more level lossless absorption circuits, applied to mostly electric
Ordinary telegram road, wherein, multi-level circuit include first switch module and second switch module, the first switch module with it is described
Second switch module is split structure, and the lossless absorption circuit includes：At least one absorbing circuit subelement, absorption electricity
Way unit is arranged between the first switch module and the second switch module, for absorbing the second switch module
The peak voltage that middle switching tube is generated in default operating condition, also, in the present solution, flying capacitor Cf need not be increased, therefore
The additional consume that flying capacitor is brought is avoided from root.
Description of the drawings
It 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
There is attached drawing needed in technology 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 the structure diagram of multi-level circuit in the prior art；
Fig. 2 is the another structure diagram of multi-level circuit in the prior art；
Fig. 3 is the another structure diagram of multi-level circuit in the prior art；
Fig. 4 is the another structure diagram of multi-level circuit in the prior art；
Fig. 5 is a kind of structure diagram of more level lossless absorption circuits provided in an embodiment of the present invention；
Fig. 6 is a kind of another structure diagram of more level lossless absorption circuits provided in an embodiment of the present invention；
Fig. 7 is a kind of another structure diagram of more level lossless absorption circuits provided in an embodiment of the present invention；
Fig. 8 is a kind of another structure diagram of more level lossless absorption circuits provided in an embodiment of the present invention；
Fig. 9 is a kind of another structure diagram of more level lossless absorption circuits provided in an embodiment of the present invention；
Figure 10 is a kind of another structure diagram of more level lossless absorption circuits provided in an embodiment of the present invention；
Figure 11 is a kind of another structure diagram of more level lossless absorption circuits provided in an embodiment of the present invention；
Figure 12 is a kind of another structure diagram of more level lossless absorption circuits provided in an embodiment of the present invention；
Figure 13 is a kind of another structure diagram of more level lossless absorption circuits provided in an embodiment of the present invention.
Specific embodiment
Referring to Fig. 5, Fig. 5 is a kind of structure diagram of more level lossless absorption circuits provided in an embodiment of the present invention,
The lossless absorption circuit is applied to multi-level circuit.Wherein, the multi-level circuit includes first switch module 501 and second
Switch module 502, the first switch module 501 are split structure with the second switch module 502.It is specifically, described
Lossless absorption circuit 503 includes：At least one absorbing circuit subelement 5031.
Wherein, the absorbing circuit subelement 5031 is arranged on the first switch module 501 and the second switch mould
Between block 502, for absorbing the peak voltage that switching tube is generated in default operating condition in the second switch module.
According to background technology, second switch mould switching tube S2 in the block and switching tube S3 is generated in HF switch
Larger due to voltage spikes influences the reliability of entire inversion system, and therefore, the present embodiment is in second switch module and first switch
Lossless absorption circuit is additionally arranged between module, peak voltage is absorbed by lossless absorption circuit.
Specifically, as shown in fig. 6, present embodiments provide a kind of specific implementation of absorbing circuit subelement, wherein,
The absorbing circuit subelement includes：First diode D1, the second diode D2 and the first capacitance C1.
Wherein, the connection relation of each device is：
The anode of the first diode D1 is connected with the first end of the second switch module, the first diode D2
Anode of the cathode respectively with the first end of the first capacitance C1 and the second diode D2 be connected, the two or two pole
The cathode of pipe D2 is connected with the first end of the first switch module, second end and the second switch of the first capacitance C1
The second end of module is connected.
With reference to the specific connection relation of foregoing circuit, the operation principle of this absorption sub-circuit is as follows：
It is assumed that bridge arm original operating state as shown in black line thick line in Fig. 7, turns off, loop inductance in certain moment switching tube S2
It is middle higher current changing rate di/dt occur, if without absorbing circuit, a larger voltage is generated on switching tube S2
Spike.
However, the present embodiment is due to adding absorbing circuit, after certain moment switching tube S2 shut-offs, loop inductance
One direction resonance is formed by the first diode D1 and the first capacitance C1, as shown in Figure 8.Since the capacity of the first capacitance C1 is opposite
It is larger, the peak value of due to voltage spikes is limited, by the energy transfer in loop inductance into the first capacitance C1, while protects switch
Pipe S2, S3 will not be damaged because of overvoltage.
In follow-up steady-state process, as shown in figure 9, the first capacitance C1 by the second diode D2 by the energy feedback of storage
To bus capacitor, and the energy absorption for switching process next time is prepared.
Except this, which can also be arranged to position as shown in Figure 10, with the absorbing circuit in Fig. 6
Subelement is the relation that is symmetrical arranged, and physical circuit principle is identical with circuit subelement in Fig. 6.
Lossless absorption circuit uses an absorbing circuit subelement in above-described embodiment, however, in the present embodiment, not
The usage quantity of absorbing circuit subelement in lossless absorption circuit is limited, as shown in figure 11, the lossless absorption circuit can be with
Including the first absorbing circuit subelement and the second absorbing circuit subelement.
Wherein, the first absorbing circuit subelement includes：First diode D1, the second diode D2 and the first capacitance
C1。
Its connection relation is：
The anode of first diode is connected with the first end of the second switch module, the moon of first diode
Anode of the pole respectively with the first end of first capacitance and second diode is connected, the cathode of second diode
It is connected with the first end of the first switch module, the second end of the second end of first capacitance and the second switch module
It is connected；
The second absorbing circuit subelement includes：3rd diode D3, the 4th diode D4 and the second capacitance C2.
Its connection relation is：
The cathode of 3rd diode is connected with the second end of the second switch module, the sun of the 3rd diode
Cathode of the pole respectively with the first end of second capacitance and the 4th diode is connected, the anode of the 4th diode
It is connected with the second end of the first switch module, the first end of the second end of second capacitance and the second switch module
It is connected.
Similarly, circuit operation principle refers to above-described embodiment.Except this, it is necessary to illustrate, in the present embodiment, and
Do not limit the concrete structure of switching tube, for example, the switching tube can be IGBT or MOSFET or other with switching characteristic
Device.
Except this, as shown in figure 12, absorbing circuit provided in this embodiment further includes：
The current-limiting circuit 121 being serially connected between the first switch module and the second switch module, wherein, the limit
Current circuit includes at least one or more of resistance, inductance impedance device, for limiting the electric current for flowing through diode, Jin Ershi
Now to the protection of diode.
It should be noted that in the present embodiment, the specific implementation structure of multi-level circuit is not limited, for example, can be with
For such as lower structure：
First switch pipe of the first switch module including concatenation, the 4th switching tube, the 5th switching tube and the 6th open
Guan Guan, the first end of the first end of the first switch pipe as the first switch module, the first of the 4th switching tube
Hold second end as the first switch module, the second end of the first switch pipe as the first switch module the
Three ends, for being connected with the first end of the second switch module, the second end of the 4th switching tube is opened as described first
The 4th end of module is closed, for being connected with the second end of the second switch module；
The second switch module includes the second switch pipe and the 3rd switching tube of concatenation, and the of the second switch pipe
First end of the one end as the second switch module, the first end of the 3rd switching tube is as the second switch module
Second end.
Except this, when the present embodiment has multiple absorbing circuit subelements, can be opened in absorbing circuit subelement and first
Multiple current-limiting circuits are provided between the module of pass, as shown in figure 13, when lossless absorption circuit includes two absorbing circuit subelements
When, it is set between each absorbing circuit subelement and first switch module there are one current-limiting circuit, such as current-limiting circuit 121 and limit
Current circuit 131.
The present embodiment additionally provides a kind of multi-level circuit, including first switch module, second switch module and connection
The above-mentioned more level lossless absorption circuits of any one between first module and second module.It, should except this
Multi-level circuit can also include bus capacitor branch and inductive branch, wherein, the bus capacitor branch and described first
Switch module is in parallel, and, the bus capacitor branch includes at least two capacitances.The inductive branch can be arranged on described
Between one switch module and the absorbing circuit subelement.
On the basis of above-described embodiment, the present embodiment additionally provides a kind of photovoltaic generating system, including in any one
The more level lossless absorption circuits stated.The operation principle and technique effect of the photovoltaic generating system refer to above-mentioned more level without
The operation principle and technique effect of absorbing circuit are damaged, herein not repeated description.
To sum up, an embodiment of the present invention provides a kind of more level lossless absorption circuits, applied to multi-level circuit, wherein,
Multi-level circuit includes first switch module and second switch module, the first switch module and the second switch module
For split structure, the lossless absorption circuit includes：At least one absorbing circuit subelement, the absorbing circuit subelement are set
Between the first switch module and the second switch module, for absorbing in the second switch module switching tube pre-
If the peak voltage generated during working condition, also, in the present solution, flying capacitor Cf need not be increased, therefore avoided from root
The additional consume that flying capacitor is brought.
Each embodiment is described by the way of progressive in this specification, the highlights of each of the examples are with other
The difference of embodiment, just to refer each other for identical similar portion between each embodiment.For device disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so description is fairly simple, related part is said referring to method part
It is bright.
Professional further appreciates that, with reference to each exemplary unit of the embodiments described herein description
And algorithm steps, can be realized with the combination of electronic hardware, computer software or the two, in order to clearly demonstrate hardware and
The interchangeability of software generally describes each exemplary composition and step according to function in the above description.These
Function is performed actually with hardware or software mode, specific application and design constraint depending on technical solution.Specialty
Technical staff can realize described function to each specific application using distinct methods, but this realization should not
Think beyond the scope of this invention.
It can directly be held with reference to the step of method or algorithm that the embodiments described herein describes with hardware, processor
The combination of capable software module or the two is implemented.Software module can be placed in random access memory (RAM), memory, read-only deposit
Reservoir (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technology
In any other form of storage medium well known in field.
The foregoing description of the disclosed embodiments enables professional and technical personnel in the field to realize or use the present invention.
A variety of modifications of these embodiments will be apparent for those skilled in the art, it is as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and the principles and novel features disclosed herein phase one
The most wide scope caused.
Claims (10)
1. a kind of more level lossless absorption circuits, which is characterized in that applied to multi-level circuit, the multi-level circuit includes the
One switch module and second switch module, the first switch module and the second switch module are split structure, institute
Stating lossless absorption circuit includes：At least one absorbing circuit subelement,
The absorbing circuit subelement is arranged between the first switch module and the second switch module, for absorbing
State the peak voltage that switching tube is generated in default operating condition in second switch module.
2. more level lossless absorption circuits according to claim 1, which is characterized in that the absorbing circuit subelement bag
It includes：First diode, the second diode and the first capacitance；
The anode of first diode is connected with the first end of the second switch module, the cathode point of first diode
Anode not with the first end of first capacitance and second diode is connected, the cathode of second diode and institute
The first end for stating first switch module is connected, the second end phase of the second end of first capacitance and the second switch module
Even.
3. more level lossless absorption circuits according to claim 1, which is characterized in that the lossless absorption circuit includes the
One absorbing circuit subelement and the second absorbing circuit subelement,
The first absorbing circuit subelement includes：First diode, the second diode and the first capacitance；
The anode of first diode is connected with the first end of the second switch module, the cathode point of first diode
Anode not with the first end of first capacitance and second diode is connected, the cathode of second diode and institute
The first end for stating first switch module is connected, the second end phase of the second end of first capacitance and the second switch module
Even；
The second absorbing circuit subelement includes：3rd diode, the 4th diode and the second capacitance；
The cathode of 3rd diode is connected with the second end of the second switch module, the anode point of the 3rd diode
Cathode not with the first end of second capacitance and the 4th diode is connected, the anode of the 4th diode and institute
The second end for stating first switch module is connected, the first end phase of the second end of second capacitance and the second switch module
Even.
4. more level lossless absorption circuits according to claim 1, which is characterized in that the switching tube for IGBT or
MOSFET。
5. more level lossless absorption circuits according to claim 1, which is characterized in that further include：
The current-limiting circuit being serially connected between the first switch module and the second switch module, the current-limiting circuit are at least wrapped
Include one or more of resistance, inductance impedance device.
6. a kind of multi-level circuit, which is characterized in that including first switch module, second switch module and be connected to described
More level lossless absorption circuits as described in any one in claim 1-5 between one module and second module.
7. multi-level circuit according to claim 6, which is characterized in that
The first switch module includes first switch pipe, the 4th switching tube, the 5th switching tube and the 6th switching tube of concatenation,
First end of the first end of the first switch pipe as the first switch module, the first end conduct of the 4th switching tube
The second end of the first switch module, the 3rd end of the second end of the first switch pipe as the first switch module,
For being connected with the first end of the second switch module, the second end of the 4th switching tube is as the first switch module
The 4th end, for being connected with the second end of the second switch module；
The second switch module includes the second switch pipe and the 3rd switching tube of concatenation, the first end of the second switch pipe
As the first end of the second switch module, the first end of the 3rd switching tube as the second switch module second
End.
8. multi-level circuit according to claim 7, which is characterized in that further include：Bus capacitor branch,
The bus capacitor branch and the first switch wired in parallel, and, the bus capacitor branch includes at least two electricity
Hold.
9. multi-level circuit according to claim 8, which is characterized in that further include：Inductive branch,
The inductive branch is arranged between the first switch module and the absorbing circuit subelement.
10. a kind of photovoltaic generating system, which is characterized in that including more level electricity as described in any one in claim 6-9
Road.
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| CN201711422222.2A CN108092533B (en) | 2017-12-25 | 2017-12-25 | A kind of more level lossless absorption circuits and photovoltaic generating system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4184736A4 (en) * | 2020-07-31 | 2023-08-16 | Huawei Digital Power Technologies Co., Ltd. | Power conversion circuit, electric power transmission system, and photovoltaic equipment |
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| Publication number | Publication date |
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| CN108092533B (en) | 2019-10-29 |
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