CN108092533B - 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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- CN108092533B CN108092533B CN201711422222.2A CN201711422222A CN108092533B CN 108092533 B CN108092533 B CN 108092533B CN 201711422222 A CN201711422222 A CN 201711422222A CN 108092533 B CN108092533 B CN 108092533B
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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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The embodiment of the 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 and second switch module are split type structure, 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, without increasing flying capacitor, therefore flying capacitor bring is avoided from the root additionally to consume.
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 technique
In general, multi-level circuit is 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 uses the identical IGBT of model, and is optimized further for the performance of switch tube, leads 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, during installation, node P1 are connected with node P2, and node N1 is connected with node N2, however, the decomposition
Mode will lead to switching tube S2 and switching tube S3 generates biggish 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 a suspension electricity in node P2 and node N2
Hold Cf.However, it is found by the inventors that flying capacitor Cf is switched on and off Shi Huiyu loop inductance in switching tube S2 and switching tube S3
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, be able to suppress due to voltage spikes, and flying capacitor bring is avoided additionally to consume, be those skilled in the art it is urgently to be resolved one
Big technical problem.
Summary of the invention
In view of this, the embodiment of the 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 the following technical solutions:
A kind of more level lossless absorption circuits are applied to multi-level circuit, and the multi-level circuit includes first switch mould
Block and second switch module, the first switch module and the second switch module are split type 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 first capacitor；
The anode of the first diode is connected with the first end of the second switch module, the yin of the first diode
Pole is connected with the anode of the first end of the first capacitor and second diode respectively, 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 the first capacitor 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 first capacitor；
The anode of the first diode is connected with the first end of the second switch module, the yin of the first diode
Pole is connected with the anode of the first end of the first capacitor and second diode respectively, 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 the first capacitor and the second switch module
It is connected；
The second absorbing circuit subelement includes: third diode, the 4th diode and the second capacitor；
The cathode of the third diode is connected with the second end of the second switch module, the sun of the third diode
Pole is connected with the cathode of the first end of second capacitor and the 4th diode respectively, 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 capacitor and the second switch module
It is connected.
Optionally, the switching tube is IGBT or MOSFET.
Optionally, further includes:
The current-limiting circuit being serially connected between the first switch module and the second switch module, the current-limiting circuit is extremely
Less including one or more impedance devices in resistance, inductance.
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,
The first switch module includes the first switch tube of concatenation, the 4th switching tube, the 5th switching tube and the 6th opens
Guan Guan, first end of the first end of the first switch tube 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 tube 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 for closing module, for being connected with the second end of the second switch module；
The second switch module includes the second switch and third switching tube of concatenation, and the of the second switch
First end of the one end as the second switch module, the first end of the third switching tube is as the second switch module
Second end.
Optionally,
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
A capacitor.
Optionally,
Further include: 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 the above-mentioned technical proposal, the embodiment of the invention provides a kind of more level lossless absorption circuits, it is applied to mostly electric
Ordinary telegram road, wherein multi-level circuit includes first switch module and second switch module, the first switch module with it is described
Second switch module is split type 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, without increasing flying capacitor Cf, therefore
Flying capacitor bring is avoided from the root additionally to consume.
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 the structural schematic diagram of multi-level circuit in the prior art；
Fig. 2 is the another structural schematic diagram of multi-level circuit in the prior art；
Fig. 3 is the another structural schematic diagram of multi-level circuit in the prior art；
Fig. 4 is the another structural schematic diagram of multi-level circuit in the prior art；
Fig. 5 is a kind of structural schematic diagram of more level lossless absorption circuits provided in an embodiment of the present invention；
Fig. 6 is a kind of another structural schematic diagram of more level lossless absorption circuits provided in an embodiment of the present invention；
Fig. 7 is a kind of another structural schematic diagram of more level lossless absorption circuits provided in an embodiment of the present invention；
Fig. 8 is a kind of another structural schematic diagram of more level lossless absorption circuits provided in an embodiment of the present invention；
Fig. 9 is a kind of another structural schematic diagram of more level lossless absorption circuits provided in an embodiment of the present invention；
Figure 10 is a kind of another structural schematic diagram of more level lossless absorption circuits provided in an embodiment of the present invention；
Figure 11 is a kind of another structural schematic diagram of more level lossless absorption circuits provided in an embodiment of the present invention；
Figure 12 is a kind of another structural schematic diagram of more level lossless absorption circuits provided in an embodiment of the present invention；
Figure 13 is a kind of another structural schematic 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 structural schematic 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 type structure with the second switch module 502.Specifically, described
Lossless absorption circuit 503 includes: at least one absorbing circuit subelement 5031.
Wherein, the setting of absorbing circuit subelement 5031 is in 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.
In conjunction with background technique it is found that switching tube S2 and switching tube S3 in second switch module are generated in HF switch
Biggish due to voltage spikes influences the reliability of entire inversion system, and therefore, the present embodiment is in second switch module and first switch
It is additionally arranged lossless absorption circuit between module, peak voltage is absorbed by lossless absorption circuit.
Specifically, as shown in fig. 6, present embodiments providing a kind of specific implementation of absorbing circuit subelement, wherein
The absorbing circuit subelement includes: first diode D1, the second diode D2 and first capacitor C1.
Wherein, the connection relationship of each device are as follows:
The anode of the first diode D1 is connected with the first end of the second switch module, the first diode D2
Cathode be connected respectively with the anode of the first end of the first capacitor C1 and the second diode D2, the two or two pole
The cathode of pipe D2 is connected with the first end of the first switch module, the second end of the first capacitor C1 and the second switch
The second end of module is connected.
In conjunction with the specific connection relationship of foregoing circuit, the working 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, switching tube S2 is turned off at a certain moment, loop inductance
It is middle higher current changing rate di/dt occur, if generating a biggish voltage on switching tube S2 without absorbing circuit
Spike.
However, the present embodiment is due to increasing absorbing circuit, at a certain moment after switching tube S2 shutdown, loop inductance
One direction resonance is formed by first diode D1 and first capacitor C1, as shown in Figure 8.Since the capacity of first capacitor C1 is opposite
It is larger, the peak value of due to voltage spikes is limited, by the energy transfer in loop inductance into first capacitor C1, while protecting switch
Pipe S2, S3 will not be damaged because of overvoltage.
In subsequent steady-state process, as shown in figure 9, first capacitor C1 passes through the second diode D2 for 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 relationship that is symmetrical arranged, and physical circuit principle is identical as 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 first capacitor
C1。
Its connection relationship are as follows:
The anode of the first diode is connected with the first end of the second switch module, the yin of the first diode
Pole is connected with the anode of the first end of the first capacitor and second diode respectively, 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 the first capacitor and the second switch module
It is connected；
The second absorbing circuit subelement includes: third diode D3, the 4th diode D4 and the second capacitor C2.
Its connection relationship are as follows:
The cathode of the third diode is connected with the second end of the second switch module, the sun of the third diode
Pole is connected with the cathode of the first end of second capacitor and the 4th diode respectively, 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 capacitor and the second switch module
It is connected.
Similarly, circuit operation principle refers to above-described embodiment.Except this, it should be noted that in the present embodiment, and
Do not limit the specific structure of switching tube, for example, the switching tube can for IGBT or MOSFET or other with switching characteristic
Device.
Except this, as shown in figure 12, absorbing circuit provided in this embodiment further include:
The current-limiting circuit 121 being serially connected between the first switch module and the second switch module, wherein the limit
Current circuit is including at least one or more impedance devices in resistance, inductance, 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 flowering structure:
The first switch module includes the first switch tube of concatenation, the 4th switching tube, the 5th switching tube and the 6th opens
Guan Guan, first end of the first end of the first switch tube 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 tube 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 for closing module, for being connected with the second end of the second switch module；
The second switch module includes the second switch and third switching tube of concatenation, and the of the second switch
First end of the one end as the second switch module, the first end of the third switching tube is as the second switch module
Second end.
Except this can be opened in absorbing circuit subelement with first when the present embodiment has multiple absorbing circuit subelements
It closes and is provided with multiple current-limiting circuits between module, as shown in figure 13, when lossless absorption circuit includes two absorbing circuit subelements
When, a current-limiting circuit is provided between each absorbing circuit subelement and first switch module, 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 capacitors.The inductive branch can be set described
Between one switch module and the absorbing circuit subelement.
On the basis of the above embodiments, the present embodiment additionally provides a kind of photovoltaic generating system, including in any one
The more level lossless absorption circuits stated.The working principle and technical effect of the photovoltaic generating system refer to above-mentioned more level without
The working principle and technical effect of absorbing circuit are damaged, herein not repeated description.
To sum up, the embodiment of the invention provides a kind of more level lossless absorption circuits, are 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 type structure, the lossless absorption circuit includes: at least one absorbing circuit subelement, absorbing circuit subelement setting
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 when working condition, also, in the present solution, without increasing flying capacitor Cf, therefore avoid from the root
Flying capacitor bring is additionally consumed.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.For device disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is said referring to method part
It is bright.
Professional further appreciates that, unit described in conjunction with the examples disclosed in the embodiments of the present disclosure
And algorithm steps, can be realized with electronic hardware, computer software, or a combination of 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 implemented in hardware or software actually, the specific application and design constraint depending on technical solution.Profession
Technical staff can use different methods to achieve the described function each specific application, but this realization is not answered
Think beyond the scope of this invention.
The step of method described in conjunction with the examples disclosed in this document or algorithm, can directly be held 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 those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (9)
1. a kind of more level lossless absorption circuits, which is characterized in that be 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 type 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；
The absorbing circuit subelement includes: first diode, the second diode and first capacitor；
The anode of the first diode is connected with the first end of the second switch module, the cathode point of the first diode
It is not connected with the anode of the first end of the first capacitor and second diode, 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 the first capacitor and the second switch module
Even.
2. 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 first capacitor；
The anode of the first diode is connected with the first end of the second switch module, the cathode point of the first diode
It is not connected with the anode of the first end of the first capacitor and second diode, 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 the first capacitor and the second switch module
Even；
The second absorbing circuit subelement includes: third diode, the 4th diode and the second capacitor；
The cathode of the third diode is connected with the second end of the second switch module, the anode point of the third diode
It is not connected with the cathode of the first end of second capacitor and the 4th diode, 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 capacitor and the second switch module
Even.
3. more level lossless absorption circuits according to claim 1, which is characterized in that the switching tube be IGBT or
MOSFET。
4. 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 resistance, one or more impedance devices in inductance.
5. a kind of multi-level circuit, which is characterized in that including first switch module, second switch module and be connected to described
The lossless suction of more level as described in any one of claim 1-4 between one switch module and the second switch module
Receive circuit.
6. multi-level circuit according to claim 5, which is characterized in that
The first switch module includes first switch tube, 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 tube as the first switch module, the first end conduct of the 4th switching tube
The second end of the first switch module, third end of the second end of the first switch tube 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 and third switching tube of concatenation, the first end of the second switch
As the first end of the second switch module, the first end of the third switching tube as the second switch module second
End.
7. multi-level circuit according to claim 6, 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.
8. multi-level circuit according to claim 7, which is characterized in that further include: inductive branch,
The inductive branch is arranged between the first switch module and the absorbing circuit subelement.
9. a kind of photovoltaic generating system, which is characterized in that including more level electricity as described in any one of claim 5-8
Road.
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| CN108923633A (en) * | 2018-07-10 | 2018-11-30 | 深圳市新威尔电子有限公司 | Switching Power Supply buffer circuit and its power supply buffer module |
| AU2020461087A1 (en) * | 2020-07-31 | 2023-03-02 | Huawei Digital Power Technologies Co., Ltd. | Power conversion circuit, power transmission system, and photovoltaic device |
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| CN100490289C (en) * | 2007-01-30 | 2009-05-20 | 南京理工大学 | Non-isolation type AC-AC tri-level converter |
| US8427010B2 (en) * | 2009-05-29 | 2013-04-23 | General Electric Company | DC-to-AC power conversion system and method |
| CN103973128A (en) * | 2013-01-30 | 2014-08-06 | 通用电气能源电能变换科技有限公司 | Electrical energy conversion system without transformer and correlation method |
| CN103516243B (en) * | 2013-10-10 | 2015-09-30 | 清华大学 | A kind of modular multi-level converter unsteady flow modular circuit with short-circuit protection |
| CN105375740B (en) * | 2014-09-01 | 2018-01-30 | 台达电子工业股份有限公司 | Circuit for power conversion |
| CN204271904U (en) * | 2014-12-04 | 2015-04-15 | 深圳市英威腾电源有限公司 | A kind of due to voltage spikes lossless absorption circuit and Switching Power Supply |
| CN105207509A (en) * | 2015-10-22 | 2015-12-30 | 北京京仪椿树整流器有限责任公司 | Absorptive L-type four-level Boost circuit |
| CN106385189B (en) * | 2016-10-13 | 2019-06-18 | 华南理工大学 | A kind of two-stage type cascaded multilevel inverter |
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