CN106712554B - A kind of High Frequency Link tandem inversion topological structure - Google Patents
A kind of High Frequency Link tandem inversion topological structure Download PDFInfo
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- CN106712554B CN106712554B CN201611269765.0A CN201611269765A CN106712554B CN 106712554 B CN106712554 B CN 106712554B CN 201611269765 A CN201611269765 A CN 201611269765A CN 106712554 B CN106712554 B CN 106712554B
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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
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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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
- H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
- H02M5/22—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
-
- 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
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
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- 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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- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The embodiment of the invention discloses a kind of High Frequency Link tandem inversion topological structures, it include: N number of photovoltaic module, N number of High Frequency Link inverter circuit and power frequency commutation circuit, the input terminal of N number of High Frequency Link inverter circuit is separately connected N number of photovoltaic module, the input terminal of the power frequency commutation circuit is connected after the output end series connection of N number of High Frequency Link inverter circuit, the output end connection AC network or AC load of the power frequency commutation circuit, the DC voltage of N number of photovoltaic module output is converted into N number of full sinusoidal wave rectified wave exchange output through N number of High Frequency Link inverter circuit high frequency sinusoidal pulse width modulation SPWM boosting, N number of full sinusoidal wave rectified wave AC series, which are superimposed and are converted to sine wave AC through the power frequency commutation circuit, is incorporated to the grid-connected work of AC network realization or output to AC load, wherein , the power frequency commutation circuit works in power frequency.Technical solution provided in an embodiment of the present invention can effectively improve the working efficiency of inverter circuit.
Description
Technical field
The present invention relates to electronic circuit technology fields, and in particular to a kind of High Frequency Link tandem inversion topological structure.
Background technique
Traditional DC-DC booster converter is also referred to as Boost, as shown in Figure 1, its basic functional principle are as follows:
When switching tube S1 is connected, the energy of inductance L1 storage energy, output loading R1 is provided by capacitor C2；It is defeated when switching tube S1 is turned off
Enter power supply Vin and be stored in the energy of L1 and charged by diode D2 to C2, and is supplied to output loading R1.Output voltage
Are as follows:Wherein D is duty ratio, thus boost function may be implemented, but the output voltage gain range of linearity compared with
It is small, although higher output voltage can be obtained by the way that bigger duty ratio is arranged, when duty ratio further increases, even
It will appear the case where input voltage declines instead.Therefore, the duty ratio of traditional Boost should not be too large, and could obtain in this way
To the direct proportion linear functional relation of output voltage and duty ratio.Currently, the power conversion topologies being more suitable for not yet, to adapt to
The practical application of high step-up ratio.
Inversion topological structure in the prior art generally uses two-stage type structure, and prime is DC/DC boosting, rear class DC/
AC inversion, although having been realized in technology maturation, simple and reliable, this two stage power translation circuit is all high-frequency work, is led
Biggish switching loss is caused, the working efficiency of inversion topological is reduced.
Summary of the invention
The embodiment of the invention provides a kind of High Frequency Link tandem inversion topological structures, to promote the work of inversion topological
Efficiency.
First aspect of the embodiment of the present invention provides a kind of High Frequency Link tandem inversion topological structure, comprising:
N number of photovoltaic module, N number of High Frequency Link inverter circuit and power frequency commutation circuit, the N are just more than or equal to 2
Integer, in which:
The input terminal of N number of High Frequency Link inverter circuit is separately connected N number of photovoltaic module, and N number of High Frequency Link is inverse
The input terminal of the power frequency commutation circuit, the output end connection of the power frequency commutation circuit are connected after the output end series connection on power transformation road
AC network or AC load；
The DC voltage of N number of photovoltaic module output is converted into N number of full sinusoidal wave through N number of High Frequency Link inverter circuit
Rectified wave exchange output, N number of full sinusoidal wave rectified wave AC series superposition are simultaneously positive through power frequency commutation circuit conversion
The exchange of string wave is incorporated to AC network and realizes grid-connected work or output to AC load.
Optionally, the High Frequency Link inverter circuit includes flyback converter circuit and boost converter circuit.
Optionally, the flyback converter circuit includes: transformer Ti, first switch tube S1i, the 4th diode D4i,
Two capacitor C2i；
Wherein, the transformer TiFirst input end connect the input terminal of the photovoltaic module, the transformer Ti?
Two input terminals connect first switch tube S1iFirst end, the first switch tube S1iSecond end connect the photovoltaic module
Output end, the transformer TiThe first output end connect the input terminal of the 4th diode D4i, the transformer Ti?
Two output ends connect the second capacitor C2iSecond end, the output end of the 4th diode D4i connects second capacitor
C2iFirst end.
Optionally, the flyback converter circuit further include: the 4th switching tube S4i；
The 4th switching tube S4iFirst end connect the 4th diode D4iInput terminal, the 4th switching tube
S4iSecond end connect the 4th diode D4iOutput end.
Optionally, the boost converter circuit includes: transformer Ti, first switch tube S1i, the second diode D2i, the 9th
Diode D9i, third diode D3iAnd third capacitor C3i；
Wherein, the transformer TiFirst input end connect the input terminal of the photovoltaic module, the transformer Ti?
Two input terminals connect first switch tube S1iFirst end, the first switch tube S1iSecond end connect the photovoltaic module
Output end, the transformer TiThe second input terminal connect the second diode D2iOutput end, the second diode D2i
Input terminal connect the third diode D3iInput terminal, the third diode D3iOutput end connect third electricity
Hold C3iFirst end, the first switch tube S1iSecond end connect the third capacitor C3iSecond end, the 9th 2 pole
Pipe D9iOutput end connect the third capacitor C3iFirst end, the 9th diode D9iInput terminal connect the third
Capacitor C3iSecond end.
Optionally, the boost converter circuit further include: the 9th switching tube S9i；
The 9th switching tube S9iFirst end connect the 9th diode D4iOutput end, the 9th switching tube
S9iSecond end connect the 9th diode D9iInput terminal.
Optionally, the boost converter circuit further include: second switch S2i；
The second switch S2iFirst end connect the second diode D2iOutput end, the second switch
S2iSecond end connect the second diode D2iInput terminal.
Optionally, the boost converter circuit further include: third switching tube S3i；
The third switching tube S3iFirst end connect the third diode D3iOutput end, the third switching tube
S3iSecond end connect the third diode D3iInput terminal.
Optionally, the power frequency commutation circuit includes: the 5th switching tube S5i, the 6th switching tube S6i, the 7th switching tube S7i、
8th switching tube S8i, the 5th diode D5i, the 6th diode D6i, the 7th diode D7i, the 8th diode D8i；
Wherein, the 5th switching tube S5iFirst end, the 5th diode D5iOutput end, it is described 7th switch
Pipe S7iFirst end, the 7th diode D7iOutput end and the second capacitor C2iFirst end connection, the described 6th opens
Close pipe S6iSecond end, the 6th diode D6iOutput end, the 8th switching tube S8iSecond end, the described 8th 2
Pole pipe D8iOutput end connect with the output end of the photovoltaic module, the 5th switching tube S5iSecond end, the described 5th 2
Pole pipe D5iInput terminal, the 6th switching tube S6iFirst end and the 6th diode D6iOutput end connection, described the
Seven switching tube S7iSecond end, the 7th diode D7iInput terminal, the 8th switching tube S8iFirst end and described the
Eight diode D8iOutput end connection；
The 5th switching tube S5iSecond end connect the first end of the AC network or AC load, the described 8th opens
Close pipe S8iFirst end connect the second end of the AC network or AC load.
Optionally, the High Frequency Link tandem inversion topological structure further include: first capacitor C1i；
The first capacitor C1iInput terminal connect the input terminal of the photovoltaic module, the first capacitor C1iOutput
End connects the output end of the photovoltaic module.
As can be seen that the High Frequency Link tandem inversion topological structure of technical solution of the embodiment of the present invention, including N number of photovoltaic group
Part, N number of High Frequency Link inverter circuit and power frequency commutation circuit, the N are the positive integer more than or equal to 2, N number of High Frequency Link
The input terminal of inverter circuit is separately connected N number of photovoltaic module, connects after the output end series connection of N number of High Frequency Link inverter circuit
Meet the input terminal of the power frequency commutation circuit, the output end connection AC network or AC load of the power frequency commutation circuit, institute
The DC voltage for stating N number of photovoltaic module output modulates SPWM through N number of High Frequency Link inverter circuit high frequency sinusoidal pulse width
Boosting is converted into the exchange output of N number of full sinusoidal wave rectified wave, and N number of full sinusoidal wave rectified wave AC series are superimposed and described in passing through
Power frequency commutation circuit is converted to sine wave AC and is incorporated to the grid-connected work of AC network realization or output to AC load, wherein described
Power frequency commutation circuit works in power frequency.When DC input voitage is higher than ac output voltage instantaneous value, High Frequency Link tandem inversion
Topological structure works in flyback mode, otherwise works in flyback and boosting overlay model, by implementing in the embodiment of the present invention
High Frequency Link tandem inversion topological structure, can effectively improve the working efficiency of inverter circuit, reduces power device quantity.
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 the present invention
Some embodiments for those of ordinary skill in the art without creative efforts, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 is the wiring schematic diagram of DC-DC voltage boosting converter in prior art tradition；
Fig. 2 is that a kind of module of High Frequency Link tandem inversion topological structure provided in an embodiment of the present invention divides schematic diagram；
Fig. 2-1 is full sinusoidal wave rectified waveform schematic diagram；
Fig. 2-2 is AC sine waveform schematic diagram；
Fig. 3 is the wiring schematic diagram of flyback converter circuit provided in an embodiment of the present invention；
Fig. 4 is the wiring schematic diagram of boost converter circuit provided in an embodiment of the present invention；
Fig. 5 is the wiring schematic diagram of power frequency commutation circuit provided in an embodiment of the present invention；
Fig. 6 is a kind of wiring schematic diagram of High Frequency Link tandem inversion topological structure provided in an embodiment of the present invention；
Fig. 7 is a kind of operation principle schematic diagram of High Frequency Link tandem inversion topological structure provided in an embodiment of the present invention.
Specific embodiment
In order to enable those skilled in the art to better understand the solution of the present invention, below in conjunction in the embodiment of the present invention
Attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is this hair
Bright a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not having
Every other embodiment obtained under the premise of creative work is made, shall fall within the protection scope of the present invention.
Description and claims of this specification and term " first ", " second ", " third ", " in above-mentioned attached drawing
Four " etc. are not use to describe a particular order for distinguishing different objects.In addition, " comprising " and " having " and they appoint
What is deformed, it is intended that is covered and non-exclusive is included.Such as contain the process, method, system, production of a series of steps or units
Product or equipment are not limited to listed step or unit, but optionally further comprising the step of not listing or unit, or
Optionally further comprising other step or units intrinsic for these process, methods, product or equipment.
Referenced herein " embodiment " is it is meant that a particular feature, structure, or characteristic described can wrap in conjunction with the embodiments
Containing at least one embodiment of the present invention.Each position in the description occur the phrase might not each mean it is identical
Embodiment, nor the independent or alternative embodiment with other embodiments mutual exclusion.Those skilled in the art explicitly and
Implicitly understand, embodiment described herein can be combined with other embodiments.
Referring to Fig. 2, the module that Fig. 2 is a kind of High Frequency Link tandem inversion topological structure provided in an embodiment of the present invention is drawn
Divide schematic diagram, as shown in Fig. 2, the High Frequency Link tandem inversion topological structure in the embodiment of the present invention includes: including N number of photovoltaic group
Part, N number of High Frequency Link inverter circuit and power frequency commutation circuit, the N are the positive integer more than or equal to 2, in which:
The input terminal of N number of High Frequency Link inverter circuit is separately connected N number of photovoltaic module, and N number of High Frequency Link is inverse
The input terminal of the power frequency commutation circuit, the output end connection of the power frequency commutation circuit are connected after the output end series connection on power transformation road
AC network or AC load；
The DC voltage of N number of photovoltaic module output is wide through N number of High Frequency Link inverter circuit high frequency sinusoidal wave impulse
Degree modulation SPWM boosting is converted into N number of full sinusoidal wave rectified wave exchange output, and N number of full sinusoidal wave rectified wave AC series are folded
Adduction, which through the power frequency commutation circuit is converted to sine wave AC and is incorporated to AC network, realizes that grid-connected work or output are negative to exchanging
It carries, wherein the power frequency commutation circuit works in power frequency.
Wherein, the High Frequency Link inverter circuit includes flyback converter circuit and boost converter circuit.
Here, High Frequency Link inversion topological structure is made of multiple High Frequency Link inverter circuits and a power frequency commutation circuit, often
A high chain frequency inverter circuit direct current input connection photovoltaic module and exchange output full sinusoidal wave rectified waveform (steamed bun wave, such as
Shown in Fig. 2-1) successively connect respectively, make each high frequency sinusoidal current waveform in full-wave rectifier (steamed bun wave, as shown in Fig. 2-2) generation circuit
Exchange output realize superposition.Rear class is power frequency commutation circuit, is that AC sine wave is defeated the superimposed steamed bun wave commutation of prime
Out.
As shown in figure 3, Fig. 3 is the wiring schematic diagram of flyback converter circuit provided in an embodiment of the present invention, the flyback
Converter circuit includes: transformer Ti, first switch tube S1i, the 4th diode D4i, the second capacitor C2i, specific link pass
It refers to shown in Fig. 3:
Wherein, the transformer TiFirst input end connect the input terminal of the photovoltaic module, the transformer Ti?
Two input terminals connect first switch tube S1iFirst end, the first switch tube S1iSecond end connect the photovoltaic module
Output end, the transformer TiThe first output end connect the input terminal of the 4th diode D4i, the transformer Ti?
Two output ends connect the second capacitor C2iSecond end, the output end of the 4th diode D4i connects second capacitor
C2iFirst end.
Optionally, the flyback converter circuit further include: the 4th switching tube S4i；
The 4th switching tube S4iFirst end connect the 4th diode D4iInput terminal, the 4th switching tube
S4iSecond end connect the 4th diode D4iOutput end.
As shown in figure 4, Fig. 4 is the wiring schematic diagram of boost converter circuit provided in an embodiment of the present invention, the boosting
Converter circuit includes: transformer Ti, first switch tube S1i, the second diode D2i, the 9th diode D9i, third diode D3i
And third capacitor C3i, specific linking relationship is referring to shown in Fig. 4:
Wherein, the transformer TiFirst input end connect the input terminal of the photovoltaic module, the transformer Ti?
Two input terminals connect first switch tube S1iFirst end, the first switch tube S1iSecond end connect the photovoltaic module
Output end, the transformer TiThe second input terminal connect the second diode D2iOutput end, the second diode D2i
Input terminal connect the third diode D3iInput terminal, the third diode D3iOutput end connect third electricity
Hold C3iFirst end, the first switch tube S1iSecond end connect the third capacitor C3iSecond end, the 9th 2 pole
Pipe D9iOutput end connect the third capacitor C3iFirst end, the 9th diode D9iInput terminal connect the third
Capacitor C3iSecond end.
Optionally, the boost converter circuit further include: the 9th switching tube S9i；
The 9th switching tube S9iFirst end connect the 9th diode D4iOutput end, the 9th switching tube
S9iSecond end connect the 9th diode D9iInput terminal.
Optionally, the boost converter circuit further include: second switch S2i；
The second switch S2iFirst end connect the second diode D2iOutput end, the second switch
S2iSecond end connect the second diode D2iInput terminal.
Optionally, the boost converter circuit further include: third switching tube S3i；
The third switching tube S3iFirst end connect the third diode D3iOutput end, the third switching tube
S3iSecond end connect the third diode D3iInput terminal.
As shown in figure 5, Fig. 5 is the wiring schematic diagram of power frequency commutation circuit provided in an embodiment of the present invention, the power frequency is changed
Circuitry phase includes: the 5th switching tube S5i, the 6th switching tube S6i, the 7th switching tube S7i, the 8th switching tube S8i, the 5th diode
D5i, the 6th diode D6i, the 7th diode D7i, the 8th diode D8i, specific linking relationship referring to Figure 5:
Wherein, the 5th switching tube S5iFirst end, the 5th diode D5iOutput end, it is described 7th switch
Pipe S7iFirst end, the 7th diode D7iOutput end and the second capacitor C2iFirst end connection, the described 6th opens
Close pipe S6iSecond end, the 6th diode D6iOutput end, the 8th switching tube S8iSecond end, the described 8th 2
Pole pipe D8iOutput end connect with the output end of the photovoltaic module, the 5th switching tube S5iSecond end, the described 5th 2
Pole pipe D5iInput terminal, the 6th switching tube S6iFirst end and the 6th diode D6iOutput end connection, described the
Seven switching tube S7iSecond end, the 7th diode D7iInput terminal, the 8th switching tube S8iFirst end and described the
Eight diode D8iOutput end connection；
The 5th switching tube S5iSecond end connect the first end of the AC network or AC load, the described 8th opens
Close pipe S8iFirst end connect the second end of the AC network or AC load.
Optionally, the High Frequency Link tandem inversion topological structure further include: first capacitor C1i；
The first capacitor C1iInput terminal connect the input terminal of the photovoltaic module, the first capacitor C1iOutput
End connects the output end of the photovoltaic module.
It please refers to shown in Fig. 6, Fig. 6 is a kind of connecing for High Frequency Link tandem inversion topological structure provided in an embodiment of the present invention
Line schematic diagram.
Specifically, the DC voltage of photovoltaic module is Vin, by capacitor C1iThe original of flyback transformer T1 is connected to after filtering
Side winding, transformer T1i, switching tube S1i, the 4th switching tube S4iAnd capacitor C2iIt constitutes flyback converter (Flyback)；Transformer
T1i, switching tube S1i, switching tube S2i, switching tube S3iAnd capacitor C3iIt constitutes booster converter (Boost), Flyback, Boost structure
At first High Frequency Link inverter circuit, output is sinusoidal current waveform in full-wave rectifier (steamed bun wave), in addition with the two of paralleled power switches
Pole pipe is its body diode or external diode.Flyback, Boost share the primary side winding and switching tube S of T1i1i, simultaneously
Capacitor C3iConstitute the passive and nondestructive peak voltage absorbing circuit (Snubber) of S1i.This topology has used multiple mutually isostructural height
The direct current input of frequency chain inverter circuit, each High Frequency Link inverter circuit connects photovoltaic module and exchanges output steamed bun wave and successively divide
It does not connect, to summarize to obtain the steamed bun wave of higher voltage amplitude.Rear class uses the same power frequency commutation circuit, by switching tube
S5i、S6i、S7iAnd S8iIt constitutes, to obtain the AC sine wave output voltage of positive and negative half-wave symmetry, ac output voltage wink
Duration is Vac, finally it is incorporated to AC network and realizes grid-connected work.
Preceding stage high frequency chain circuit uses SPWM modulation system, in High Frequency Link bus capacitor C2i、C3iBoth ends generate full sinusoidal wave
Rectified signal, operation interval are divided into two sections: Vin>Vac and Vin<Vac, as shown in Figure 7:
When Vin > Vac, S2iLasting shutdown, S3iWith S9iConstant conduction: S1iWhen conducting, S4iWith D4iReverse bias and end,
T1iPrimary side winding storage energy, C3iBoth end voltage passes through S3i、D2i、S1iOr directly pass through S9iElectric discharge, and DC/AC commutation circuit
Input power and output power are by C2iElectric discharge provides；S1iWhen shutdown, S4iWith D4iForward bias and be connected, T1iPrimary side winding energy
Amount is released to DC/AC commutation circuit and output loading, while giving C2iCharging, this operation interval are known as flyback mode.
When Vin < Vac, S9iLasting shutdown, S2iConstant conduction, S3i, which are worked in, synchronizes whole state: S1iWhen conducting, S4iWith D4i
Reverse bias and end, T1iPrimary side winding storage energy, while S3iShutdown, DC/AC commutation circuit input power and output work
Rate is by C2i、C3iElectric discharge provides；S1iWhen shutdown, S4iWith D4iForward bias and be connected, T1iPrimary side winding energy on the one hand give C2i
On the other hand the S of constant conduction is passed through in charging2i、D3iTo C3iIt charges, to constitute passive and nondestructive Snubber circuit, D3iConducting
S afterwards3iIt is connected again and synchronous rectification can be realized, while energy is also released to DC/AC commutation circuit and output loading, this work
It is known as flyback and boosting overlay model as section.
Controller predominantly detects the electric current output and input, voltage signal, generates after internal algorithm and logical process
The driving signal of all switching tubes, and complete required alternating current-direct current defencive function.By the processing of controller, topology can
Think CCM, DCM, BCM or QR control model.
The working principle of other High Frequency Link inverter circuits is same.
Wherein, in capacitor C3i both ends inverse parallel switching tube S9i, effect is the offer in Vin > Vac operation interval
The operating current access of Flyback, can also remove switching tube S9iAnd only retain diode D9i, it is logical can equally to provide electric current
Road.
Wherein, synchronous rectification switch pipe S has been used3i, effect is that the work of Boost is provided in Vin < Vac operation interval
Make current path, synchronous rectification switch pipe S can also be removed3iAnd only retain diode D3i, current path can be equally provided.
Wherein, the secondary side of Flyback transformer has used switching tube S4i, effect be to provide synchronous rectification with it is idle
Compensation, can also remove synchronous rectification switch pipe S4iAnd only retain diodeD4i, without the basic operation of influence inversion topological.
High Frequency Link tandem inversion topological structure in the embodiment of the present invention, is particularly suitable for the inversion compared with low input
Circuit can be applied in photovoltaic DC-to-AC converter, uninterruptible power supply (UPS) and variable-frequency power sources.
As can be seen that the High Frequency Link tandem inversion topological structure of technical solution of the embodiment of the present invention, including N number of photovoltaic group
Part, N number of High Frequency Link inverter circuit and power frequency commutation circuit, the N are the positive integer more than or equal to 2, N number of High Frequency Link
The input terminal of inverter circuit is separately connected N number of photovoltaic module, connects after the output end series connection of N number of High Frequency Link inverter circuit
Meet the input terminal of the power frequency commutation circuit, the output end connection AC network or AC load of the power frequency commutation circuit, institute
The DC voltage for stating N number of photovoltaic module output modulates SPWM through N number of High Frequency Link inverter circuit high frequency sinusoidal pulse width
Boosting is converted into the exchange output of N number of full sinusoidal wave rectified wave, and N number of full sinusoidal wave rectified wave AC series are superimposed and described in passing through
Power frequency commutation circuit is converted to sine wave AC and is incorporated to the grid-connected work of AC network realization or output to AC load, wherein described
Power frequency commutation circuit works in power frequency.When DC input voitage is higher than ac output voltage instantaneous value, High Frequency Link tandem inversion
Topological structure works in flyback mode, otherwise works in flyback and boosting overlay model, by implementing in the embodiment of the present invention
High Frequency Link tandem inversion topological structure, can effectively improve the working efficiency of inverter circuit, reduces power device quantity.
A kind of High Frequency Link tandem inversion topological structure is provided for the embodiments of the invention above to be described in detail,
Used herein a specific example illustrates the principle and implementation of the invention, and the explanation of above embodiments is only used
In facilitating the understanding of the method and its core concept of the invention；At the same time, for those skilled in the art, according to the present invention
Thought, there will be changes in the specific implementation manner and application range, in conclusion the content of the present specification should not be construed as
Limitation of the present invention.
Claims (3)
1. a kind of High Frequency Link tandem inversion topological structure, which is characterized in that the High Frequency Link tandem inversion topological structure packet
N number of photovoltaic module, N number of High Frequency Link inverter circuit and power frequency commutation circuit are included, the N is the positive integer more than or equal to 2,
In:
The input terminal of N number of High Frequency Link inverter circuit is separately connected N number of photovoltaic module, N number of High Frequency Link inversion electricity
The input terminal of the power frequency commutation circuit is connected after the output end series connection on road, the output end of the power frequency commutation circuit connects exchange
Power grid or AC load；
The DC voltage of N number of photovoltaic module output is through N number of High Frequency Link inverter circuit high frequency sinusoidal pulse width tune
SPWM boosting processed is converted into N number of full sinusoidal wave rectified wave exchange output, and N number of full sinusoidal wave rectified wave AC series superposition is simultaneously
Through the power frequency commutation circuit be converted to sine wave AC be incorporated to AC network realize grid-connected work or output to AC load,
In, the power frequency commutation circuit works in power frequency；
The High Frequency Link inverter circuit includes flyback converter circuit and boost converter circuit；
The flyback converter circuit includes: transformer Ti, first switch tube S1i, the 4th diode D4i, the second capacitor C2i；
Wherein, the transformer TiFirst input end connect the input terminal of the photovoltaic module, the transformer TiIt is second defeated
Enter end connection first switch tube S1iFirst end, the first switch tube S1iSecond end connect the output of the photovoltaic module
End, the transformer TiThe first output end connect the input terminal of the 4th diode D4i, the transformer TiIt is second defeated
Outlet connects the second capacitor C2iSecond end, the output end of the 4th diode D4i connects the second capacitor C2i's
First end；
The flyback converter circuit further include: the 4th switching tube S4i；
The 4th switching tube S4iFirst end connect the 4th diode D4iInput terminal, the 4th switching tube S4i's
Second end connects the 4th diode D4iOutput end；
The boost converter circuit includes: transformer Ti, first switch tube S1i, the second diode D2i, the 9th diode D9i,
Three diode D3iAnd third capacitor C3i；
Wherein, the transformer TiFirst input end connect the input terminal of the photovoltaic module, the transformer TiIt is second defeated
Enter end connection first switch tube S1iFirst end, the first switch tube S1iSecond end connect the output of the photovoltaic module
End, the transformer TiThe second input terminal connect the second diode D2iOutput end, the second diode D2iIt is defeated
Enter end and connects the third diode D3iInput terminal, the third diode D3iOutput end connect the third capacitor C3i
First end, the first switch tube S1iSecond end connect the third capacitor C3iSecond end, the 9th diode D9i
Output end connect the third capacitor C3iFirst end, the 9th diode D9iInput terminal connect the third capacitor
C3iSecond end；
The boost converter circuit further include: the 9th switching tube S9i；
The 9th switching tube S9iFirst end connect the 9th diode D4iOutput end, the 9th switching tube S9i's
Second end connects the 9th diode D9iInput terminal；
The boost converter circuit further include: second switch S2i；
The second switch S2iFirst end connect the second diode D2iOutput end, the second switch S2i's
Second end connects the second diode D2iInput terminal；
The boost converter circuit further include: third switching tube S3i；
The third switching tube S3iFirst end connect the third diode D3iOutput end, the third switching tube S3i's
Second end connects the third diode D3iInput terminal.
2. the High Frequency Link tandem inversion topological structure as described in claim 1, which is characterized in that the power frequency commutation circuit
It include: the 5th switching tube S5i, the 6th switching tube S6i, the 7th switching tube S7i, the 8th switching tube S8i, the 5th diode D5i, the 6th
Diode D6i, the 7th diode D7iAnd the 8th diode D8i；
Wherein, the 5th switching tube S5iFirst end, the 5th diode D5iOutput end, the 7th switching tube S7i
First end, the 7th diode D7iOutput end and the second capacitor C2iFirst end connection, the 6th switching tube
S6iSecond end, the 6th diode D6iOutput end, the 8th switching tube S8iSecond end, the 8th diode
D8iOutput end connect with the output end of the photovoltaic module, the 5th switching tube S5iSecond end, the 5th diode
D5iInput terminal, the 6th switching tube S6iFirst end and the 6th diode D6iOutput end connection, the described 7th opens
Close pipe S7iSecond end, the 7th diode D7iInput terminal, the 8th switching tube S8iFirst end and the described 8th 2
Pole pipe D8iOutput end connection；
The 5th switching tube S5iSecond end connect the first end of the AC network or AC load, the 8th switching tube
S8iFirst end connect the second end of the AC network or AC load.
3. High Frequency Link tandem inversion topological structure as claimed in claim 2, which is characterized in that the High Frequency Link tandem is inverse
Variable topological structure further include: first capacitor C1i；
The first capacitor C1iInput terminal connect the input terminal of the photovoltaic module, the first capacitor C1iOutput end connection
The output end of the photovoltaic module.
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