CN106712554A - High-frequency-link tandem type inverter topological structure - Google Patents
High-frequency-link tandem type inverter topological structure Download PDFInfo
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- CN106712554A CN106712554A CN201611269765.0A CN201611269765A CN106712554A CN 106712554 A CN106712554 A CN 106712554A CN 201611269765 A CN201611269765 A CN 201611269765A CN 106712554 A CN106712554 A CN 106712554A
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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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- Inverter Devices (AREA)
Abstract
The embodiment of the invention discloses a high-frequency-link tandem type inverter topological structure, which comprises N photovoltaic assemblies, N high-frequency chain inverter circuits and a power frequency commutation circuit. The input ends of the N high-frequency chain inverter circuits are respectively connected with the N photovoltaic assemblies. The output ends of the N high-frequency chain inverter circuits are connected in series and then are connected with the input end of the power frequency commutation circuit. The output end of the power frequency commutation circuit is connected with an AC power grid or an AC load. The output DC voltages of the N photovoltaic assemblies are converted into N sine full-wave rectification waves for realizing the AC output through the sine wave pulse width modulation (SPWM) of the N high-frequency chain inverter circuits. The N sine full-wave rectification waves are subjected to the AC series superposition and the conversion of the power frequency commutation circuit to be converted into sine waves and the sine waves are incorporated into the power grid in the AC form to realize the grid-connected operation or to be outputted to the AC load. The power frequency commutation circuit is operated at the power frequency. According to the technical scheme of the invention provided in the embodiments of the invention, the working efficiency of an inverter circuit is effectively improved.
Description
Technical field
The present invention relates to electronic circuit technology field, and in particular to a kind of High Frequency Link tandem inversion topological structure.
Background technology
Traditional DC-DC booster converter is also referred to as Boost, as shown in figure 1, its basic functional principle is：
When switching tube S1 is turned on, inductance L1 storage energies, the energy of output loading R1 is provided by electric capacity C2；It is defeated when switching tube S1 is turned off
The energy for entering power supply Vin and storage in L1 is charged with by diode D2 to C2, and is supplied to output loading R1.Output voltage
For：Wherein D is dutycycle, thus can realize boost function, but the output voltage gain range of linearity compared with
It is small, although can to obtain output voltage higher by setting bigger dutycycle, but dutycycle is when further increasing, or even
The situation that input voltage declines on the contrary occurs.Therefore, the dutycycle of traditional Boost is unsuitable excessive, could so obtain
To output voltage and the direct proportion linear functional relation of dutycycle.At present, the power conversion topologies not being more suitable for also, to adapt to
The practical application of high step-up ratio.
Inversion topological structure of the prior art typically uses two-stage type structure, and prime is that DC/DC boosts, rear class is DC/
AC inversions, although have been realized in technology maturation, simple and reliable, but this two stage power translation circuit is all high-frequency work, is led
Larger switching loss is caused, the operating efficiency of inversion topological is reduced.
The content of the invention
A kind of High Frequency Link tandem inversion topological structure is the embodiment of the invention provides, to lift the work of inversion topological
Efficiency.
Embodiment of the present invention first aspect provides a kind of High Frequency Link tandem inversion topological structure, including：
N number of photovoltaic module, N number of High Frequency Link inverter circuit and power frequency commutation circuit, the N is more than or equal to 2 just
Integer, wherein：
The input of N number of High Frequency Link inverter circuit connects N number of photovoltaic module respectively, and N number of High Frequency Link is inverse
The input of the power frequency commutation circuit, the output end connection of the power frequency commutation circuit are connected after the output end series connection for becoming circuit
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 is simultaneously converted to just through the power frequency commutation circuit
The exchange of string ripple is incorporated to AC network and realizes grid-connected work or output to AC load.
Optionally, the High Frequency Link inverter circuit includes anti exciting converter circuit and boost converter circuit.
Optionally, the anti exciting converter circuit includes：Transformer Ti, first switch pipe S1i, the 4th diode D4i,
Two electric capacity C2i；
Wherein, the transformer TiFirst input end connect the input of the photovoltaic module, the transformer Ti
Two inputs connection first switch pipe S1iFirst end, the first switch pipe S1iThe second end connect the photovoltaic module
Output end, the transformer TiThe first output end connect the input of the 4th diode D4i, the transformer Ti
Two output ends connect the second electric capacity C2iThe second end, the output end of the 4th diode D4i connects second electric capacity
C2iFirst end.
Optionally, the anti exciting converter circuit also includes：4th switching tube S4i；
The 4th switching tube S4iFirst end connect the 4th diode D4iInput, the 4th switching tube
S4iThe second end connect the 4th diode D4iOutput end.
Optionally, the boost converter circuit includes：Transformer Ti, first switch pipe S1i, the second diode D2i, the 9th
Diode D9i, the 3rd diode D3iAnd the 3rd electric capacity C3i；
Wherein, the transformer TiFirst input end connect the input of the photovoltaic module, the transformer Ti
Two inputs connection first switch pipe S1iFirst end, the first switch pipe S1iThe second end connect the photovoltaic module
Output end, the transformer TiThe second input connect the second diode D2iOutput end, the second diode D2i
Input connect the 3rd diode D3iInput, the 3rd diode D3iOutput end connection it is described 3rd electricity
Hold C3iFirst end, the first switch pipe S1iThe second end connect the 3rd electric capacity C3iThe second end, the 9th 2 pole
Pipe D9iOutput end connect the 3rd electric capacity C3iFirst end, the 9th diode D9iInput connection the described 3rd
Electric capacity C3iThe second end.
Optionally, the boost converter circuit also includes：9th switching tube S9i；
The 9th switching tube S9iFirst end connect the 9th diode D4iOutput end, the 9th switching tube
S9iThe second end connect the 9th diode D9iInput.
Optionally, the boost converter circuit also includes：Second switch pipe S2i；
The second switch pipe S2iFirst end connect the second diode D2iOutput end, the second switch pipe
S2iThe second end connect the second diode D2iInput.
Optionally, the boost converter circuit also includes：3rd switching tube S3i；
The 3rd switching tube S3iFirst end connect the 3rd diode D3iOutput end, the 3rd switching tube
S3iThe second end connect the 3rd diode D3iInput.
Optionally, the power frequency commutation circuit includes：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 electric capacity C2iFirst end connection, the described 6th opens
Close pipe S6iThe second end, the 6th diode D6iOutput end, the 8th switching tube S8iThe second end, the described 8th 2
Pole pipe D8iOutput end be connected with the output end of the photovoltaic module, the 5th switching tube S5iThe second end, the described 5th 2
Pole pipe D5iInput, the 6th switching tube S6iFirst end and the 6th diode D6iOutput end connection, described the
Seven switching tube S7iThe second end, the 7th diode D7iInput, the 8th switching tube S8iFirst end and described
Eight diode D8iOutput end connection；
The 5th switching tube S5iThe second 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 also includes：First electric capacity C1i；
The first electric capacity C1iInput connect the input of the photovoltaic module, the first electric capacity C1iOutput
The output end of the end connection photovoltaic module.
As can be seen that the High Frequency Link tandem inversion topological structure of embodiment of the present invention technical scheme, including N number of photovoltaic group
Part, N number of High Frequency Link inverter circuit and power frequency commutation circuit, the N is the positive integer more than or equal to 2, N number of High Frequency Link
The input of inverter circuit connects N number of photovoltaic module respectively, connects after the output end series connection of N number of High Frequency Link inverter circuit
Connect the input of the power frequency commutation circuit, output end connection AC network or the AC load of the power frequency commutation circuit, institute
The DC voltage of N number of photovoltaic module output is stated through N number of High Frequency Link inverter circuit high_frequency sine wave pulse width 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 superimposed and pass through described
Power frequency commutation circuit be converted to sine wave AC be incorporated to AC network realize grid-connected work 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 the embodiment of the present invention in
High Frequency Link tandem inversion topological structure, can effectively improve the operating efficiency of inverter circuit, reduce power device quantity.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are the present invention
Some embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
These accompanying drawings obtain other accompanying drawings.
Fig. 1 is the wiring schematic diagram of DC-DC voltage boosting converter in prior art tradition；
Fig. 2 is a kind of Module Division schematic diagram of High Frequency Link tandem inversion topological structure provided in an embodiment of the present invention；
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 anti exciting 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 that those skilled in the art more fully understand the present invention program, below in conjunction with the embodiment of the present invention
Accompanying drawing, is clearly and completely described to the technical scheme in the embodiment of the present invention, it is clear that described embodiment is this hair
Bright a part of embodiment, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not having
There is the every other embodiment made and being obtained under the premise of creative work, belong to the scope of protection of the invention.
Term " first ", " second ", " the 3rd ", " in description and claims of this specification and above-mentioned accompanying drawing
Four " it is etc. for distinguishing different objects, rather than for describing particular order.Additionally, " comprising " and " having " and they appoint
What deforms, it is intended that covering is non-exclusive to be included.For example contain process, method, system, the product of series of steps or unit
Product or equipment are not limited to the step of having listed or unit, but alternatively also include the step of not listing or unit, or
Alternatively also include for these processes, method, product or other intrinsic steps of equipment or unit.
Referenced herein " embodiment " is it is meant that the special characteristic, structure or the characteristic that describe can be wrapped 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.
Fig. 2 is referred to, Fig. 2 is that a kind of module 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 is the positive integer more than or equal to 2, wherein：
The input of N number of High Frequency Link inverter circuit connects N number of photovoltaic module respectively, and N number of High Frequency Link is inverse
The input of the power frequency commutation circuit, the output end connection of the power frequency commutation circuit are connected after the output end series connection for becoming circuit
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 boostings are 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 is converted to sine wave AC and is incorporated to AC network through the power frequency commutation circuit realizes that grid-connected work or output are negative to exchanging
Carry, wherein the power frequency commutation circuit works in power frequency.
Wherein, the High Frequency Link inverter circuit includes anti exciting converter circuit and boost converter circuit.
Here, High Frequency Link inversion topological structure is made up of multiple High Frequency Link inverter circuits and a power frequency commutation circuit, often
Individual chain frequency inverter circuit high direct current input connection photovoltaic module and exchange output full sinusoidal wave rectified waveform (steamed bun ripple, such as
Shown in Fig. 2-1) connect respectively successively, each high frequency sinusoidal current waveform in full-wave rectifier (steamed bun ripple, as shown in Fig. 2-2) is produced circuit
Exchange output realize superposition.Rear class is power frequency commutation circuit, and the steamed bun ripple commutation after prime is superimposed is defeated for AC sine wave
Go out.
As shown in figure 3, Fig. 3 is the wiring schematic diagram of anti exciting converter circuit provided in an embodiment of the present invention, the flyback
Converter circuit includes：Transformer Ti, first switch pipe S1i, the 4th diode D4i, the second electric capacity C2i, its specific link pass
Refer to shown in Fig. 3：
Wherein, the transformer TiFirst input end connect the input of the photovoltaic module, the transformer Ti
Two inputs connection first switch pipe S1iFirst end, the first switch pipe S1iThe second end connect the photovoltaic module
Output end, the transformer TiThe first output end connect the input of the 4th diode D4i, the transformer Ti
Two output ends connect the second electric capacity C2iThe second end, the output end of the 4th diode D4i connects second electric capacity
C2iFirst end.
Optionally, the anti exciting converter circuit also includes：4th switching tube S4i；
The 4th switching tube S4iFirst end connect the 4th diode D4iInput, the 4th switching tube
S4iThe second 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 pipe S1i, the second diode D2i, the 9th diode D9i, the 3rd diode D3i
And the 3rd electric capacity C3i, shown in its specific linking relationship reference picture 4：
Wherein, the transformer TiFirst input end connect the input of the photovoltaic module, the transformer Ti
Two inputs connection first switch pipe S1iFirst end, the first switch pipe S1iThe second end connect the photovoltaic module
Output end, the transformer TiThe second input connect the second diode D2iOutput end, the second diode D2i
Input connect the 3rd diode D3iInput, the 3rd diode D3iOutput end connection it is described 3rd electricity
Hold C3iFirst end, the first switch pipe S1iThe second end connect the 3rd electric capacity C3iThe second end, the 9th 2 pole
Pipe D9iOutput end connect the 3rd electric capacity C3iFirst end, the 9th diode D9iInput connection the described 3rd
Electric capacity C3iThe second end.
Optionally, the boost converter circuit also includes：9th switching tube S9i；
The 9th switching tube S9iFirst end connect the 9th diode D4iOutput end, the 9th switching tube
S9iThe second end connect the 9th diode D9iInput.
Optionally, the boost converter circuit also includes：Second switch pipe S2i；
The second switch pipe S2iFirst end connect the second diode D2iOutput end, the second switch pipe
S2iThe second end connect the second diode D2iInput.
Optionally, the boost converter circuit also includes：3rd switching tube S3i；
The 3rd switching tube S3iFirst end connect the 3rd diode D3iOutput end, the 3rd switching tube
S3iThe second end connect the 3rd diode D3iInput.
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：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, shown in its specific linking relationship reference picture 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 electric capacity C2iFirst end connection, the described 6th opens
Close pipe S6iThe second end, the 6th diode D6iOutput end, the 8th switching tube S8iThe second end, the described 8th 2
Pole pipe D8iOutput end be connected with the output end of the photovoltaic module, the 5th switching tube S5iThe second end, the described 5th 2
Pole pipe D5iInput, the 6th switching tube S6iFirst end and the 6th diode D6iOutput end connection, described the
Seven switching tube S7iThe second end, the 7th diode D7iInput, the 8th switching tube S8iFirst end and described
Eight diode D8iOutput end connection；
The 5th switching tube S5iThe second 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 also includes：First electric capacity C1i；
The first electric capacity C1iInput connect the input of the photovoltaic module, the first electric capacity C1iOutput
The output end of the end connection photovoltaic module.
Refer 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 electric capacity C1iThe original of flyback transformer T1 is connected to after filtering
Side winding, transformer T1i, switching tube S1i, the 4th switching tube S4iAnd electric capacity C2iConstitute anti exciting converter (Flyback)；Transformer
T1i, switching tube S1i, switching tube S2i, switching tube S3iAnd electric capacity C3iConstitute booster converter (Boost), Flyback, Boost structure
Into first High Frequency Link inverter circuit, it is output as full sinusoidal wave rectified waveform (steamed bun ripple), 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, while
Electric capacity C3iConstitute passive and nondestructive peak voltage absorbing circuit (Snubber) of S1i.This topology has used multiple mutually isostructural height
Frequency chain inverter circuit, the direct current input of each High Frequency Link inverter circuit connects photovoltaic module and exchanges output steamed bun ripple and divide successively
Do not connect, the steamed bun ripple of higher voltage amplitude is obtained so as to collect.Rear class uses same power frequency commutation circuit, by switching tube
S5i、S6i、S7iAnd S8iConstitute, so as to obtain the AC sine wave output voltage of positive and negative half-wave symmetry, its 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 systems, in High Frequency Link bus capacitor C2i、C3iTwo ends produce full sinusoidal wave
Rectified signal, its operation interval is divided into two sections：Vin>Vac and Vin<Vac, as shown in Figure 7：
Vin>During Vac, S2iLasting shut-off, S3iWith S9iConstant conduction：S1iDuring conducting, S4iWith D4iReverse bias and end,
T1iPrimary side winding storage energy, C3iBoth end voltage is by S3i、D2i、S1iOr directly pass through S9iElectric discharge, and DC/AC commutation circuits
Input power and power output are by C2iElectric discharge is provided；S1iDuring shut-off, S4iWith D4iForward bias and turn on, T1iPrimary side winding energy
Amount is released to DC/AC commutation circuits and output loading, while giving C2iCharge, this operation interval is referred to as flyback mode.
Vin<During Vac, S9iLasting shut-off, S2iConstant conduction, S3i work in synchronous whole state：S1iDuring conducting, S4iWith D4i
Reverse bias and end, T1iPrimary side winding storage energy, while S3iShut-off, DC/AC commutation circuits input power and output work
Rate is by C2i、C3iElectric discharge is provided；S1iDuring shut-off, S4iWith D4iForward bias and turn on, T1iPrimary side winding energy on the one hand give C2i
Charge, on the other hand by the S of constant conduction2i、D3iTo C3iCharge, so as to constitute passive and nondestructive Snubber circuits, D3iConducting
S afterwards3iTurn on again and be capable of achieving synchronous rectification, while energy is also released to DC/AC commutation circuits and output loading, this work
Make the interval flyback that is referred to as with boosting overlay model.
Controller predominantly detects electric current, the voltage signal of input and output, by being produced after internal algorithm and logical process
The drive signal of all switching tubes, and complete required alternating current-direct current defencive function.By the treatment of controller, topology can
Think CCM, DCM, BCM or QR control model.
The operation principle of other High Frequency Link inverter circuits is same.
Wherein, the switching tube S in electric capacity C3i two ends inverse parallels9i, its effect is in Vin>There is provided during Vac operation intervals
The operating current path of Flyback, can also remove switching tube S9iAnd only retain diode D9i, electric current can be equally provided and led to
Road.
Wherein, synchronous rectification switch pipe S has been used3i, its effect is in Vin<The work of Boost is provided during Vac operation intervals
Make current path, can also remove synchronous rectification switch pipe S3iAnd only retain diode D3i, current path can be equally provided.
Wherein, the secondary of Flyback transformers has used switching tube S4i, its effect be to provide synchronous rectification with it is idle
Compensation, can also remove synchronous rectification switch pipe S4iAnd only retain diodeD4i, the basic operation without influenceing inversion topological.
High Frequency Link tandem inversion topological structure in the embodiment of the present invention, is particularly suited for the inversion compared with low input
Circuit, in can apply to photovoltaic DC-to-AC converter, uninterrupted power source (UPS) and variable-frequency power sources.
As can be seen that the High Frequency Link tandem inversion topological structure of embodiment of the present invention technical scheme, including N number of photovoltaic group
Part, N number of High Frequency Link inverter circuit and power frequency commutation circuit, the N is the positive integer more than or equal to 2, N number of High Frequency Link
The input of inverter circuit connects N number of photovoltaic module respectively, connects after the output end series connection of N number of High Frequency Link inverter circuit
Connect the input of the power frequency commutation circuit, output end connection AC network or the AC load of the power frequency commutation circuit, institute
The DC voltage of N number of photovoltaic module output is stated through N number of High Frequency Link inverter circuit high_frequency sine wave pulse width 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 superimposed and pass through described
Power frequency commutation circuit be converted to sine wave AC be incorporated to AC network realize grid-connected work 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 the embodiment of the present invention in
High Frequency Link tandem inversion topological structure, can effectively improve the operating efficiency of inverter circuit, reduce power device quantity.
A kind of High Frequency Link tandem inversion topological structure for being provided the embodiment of the present invention above is described in detail,
Specific case used herein is set forth to principle of the invention and implementation method, and the explanation of above example is use
Understand the method for the present invention and its core concept in help；Simultaneously for those of ordinary skill in the art, according to of the invention
Thought, will change in specific embodiments and applications, and in sum, this specification content should not be construed as
Limitation of the present invention.
Claims (10)
1. a kind of High Frequency Link tandem inversion topological structure, it is characterised in that the High Frequency Link tandem inversion topological structure bag
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, its
In：
The input of N number of High Frequency Link inverter circuit connects N number of photovoltaic module, N number of High Frequency Link inversion electricity respectively
The input of the power frequency commutation circuit, the output end connection exchange of the power frequency commutation circuit are connected after the output end series connection on road
Power network or AC load；
The DC voltage of N number of photovoltaic module output is adjusted through N number of High Frequency Link inverter circuit high frequency sinusoidal pulse width
SPWM boostings processed are 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, its
In, the power frequency commutation circuit works in power frequency.
2. High Frequency Link tandem inversion topological structure as claimed in claim 1, it is characterised in that the High Frequency Link inverter circuit
Including anti exciting converter circuit and boost converter circuit.
3. High Frequency Link tandem inversion topological structure as claimed in claim 2, it is characterised in that the anti exciting converter circuit
Including：Transformer Ti, first switch pipe S1i, the 4th diode D4i, the second electric capacity C2i；
Wherein, the transformer TiFirst input end connect the input of the photovoltaic module, the transformer TiIt is second defeated
Enter end and connect first switch pipe S1iFirst end, the first switch pipe S1iThe second end connect the output of the photovoltaic module
End, the transformer TiThe first output end connect the input of the 4th diode D4i, the transformer TiIt is second defeated
Go out end connection the second electric capacity C2iThe second end, the output end of the 4th diode D4i connects the second electric capacity C2i's
First end.
4. High Frequency Link tandem inversion topological structure as claimed in claim 3, it is characterised in that the anti exciting converter circuit
Also include：4th switching tube S4i；
The 4th switching tube S4iFirst end connect the 4th diode D4iInput, the 4th switching tube S4i's
Second end connects the 4th diode D4iOutput end.
5. the High Frequency Link tandem inversion topological structure as described in claim 3 or 4, it is characterised in that the booster converter
Circuit includes：Transformer Ti, first switch pipe S1i, the second diode D2i, the 9th diode D9i, the 3rd diode D3iAnd the 3rd
Electric capacity C3i；
Wherein, the transformer TiFirst input end connect the input of the photovoltaic module, the transformer TiIt is second defeated
Enter end and connect first switch pipe S1iFirst end, the first switch pipe S1iThe second end connect the output of the photovoltaic module
End, the transformer TiThe second input connect the second diode D2iOutput end, the second diode D2iIt is defeated
Enter end connection the 3rd diode D3iInput, the 3rd diode D3iOutput end connect the 3rd electric capacity C3i
First end, the first switch pipe S1iThe second end connect the 3rd electric capacity C3iThe second end, the 9th diode D9i
Output end connect the 3rd electric capacity C3iFirst end, the 9th diode D9iInput connect the 3rd electric capacity
C3iThe second end.
6. High Frequency Link tandem inversion topological structure as claimed in claim 5, it is characterised in that the boost converter circuit
Also include：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.
7. High Frequency Link tandem inversion topological structure as claimed in claim 5, it is characterised in that the boost converter circuit
Also include：Second switch pipe S2i；
The second switch pipe S2iFirst end connect the second diode D2iOutput end, the second switch pipe S2i's
Second end connects the second diode D2iInput.
8. High Frequency Link tandem inversion topological structure as claimed in claim 5, it is characterised in that the boost converter circuit
Also include：3rd switching tube S3i；
The 3rd switching tube S3iFirst end connect the 3rd diode D3iOutput end, the 3rd switching tube S3i's
Second end connects the 3rd diode D3iInput.
9. the High Frequency Link tandem inversion topological structure as described in any one of claim 5 to 8, it is characterised in that the power frequency
Commutation circuit includes：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 electric capacity C2iFirst end connection, the 6th switching tube
S6iThe second end, the 6th diode D6iOutput end, the 8th switching tube S8iThe second end, the 8th diode
D8iOutput end be connected with the output end of the photovoltaic module, the 5th switching tube S5iThe second end, the 5th diode
D5iInput, the 6th switching tube S6iFirst end and the 6th diode D6iOutput end connection, the described 7th opens
Close pipe S7iThe second end, the 7th diode D7iInput, the 8th switching tube S8iFirst end and the described 8th 2
Pole pipe D8iOutput end connection；
The 5th switching tube S5iThe second 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.
10. High Frequency Link tandem inversion topological structure as claimed in claim 9, it is characterised in that the High Frequency Link tandem
Inversion topological structure also includes：First electric capacity C1i；
The first electric capacity C1iInput connect the input of the photovoltaic module, the first electric capacity C1iOutput end connection
The output end of the photovoltaic module.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102969919A (en) * | 2012-12-07 | 2013-03-13 | 浙江昱能光伏科技集成有限公司 | DC-AC (direct current to alternating current) power conversion device |
| CN103595253A (en) * | 2012-08-13 | 2014-02-19 | 弗莱克斯电子有限责任公司 | Novel control method to reduce switching loss on MOSFET |
| US20140049115A1 (en) * | 2006-12-06 | 2014-02-20 | Solaredge Technologies Ltd. | Method for Distributed Power Harvesting Using DC Power Sources |
| CN106026742A (en) * | 2016-07-21 | 2016-10-12 | 江苏博斯特新能源技术有限公司 | Multichannel photovoltaic power generation micro-inverter with high frequency isolation link |
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2016
- 2016-12-30 CN CN201611269765.0A patent/CN106712554B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140049115A1 (en) * | 2006-12-06 | 2014-02-20 | Solaredge Technologies Ltd. | Method for Distributed Power Harvesting Using DC Power Sources |
| CN103595253A (en) * | 2012-08-13 | 2014-02-19 | 弗莱克斯电子有限责任公司 | Novel control method to reduce switching loss on MOSFET |
| CN102969919A (en) * | 2012-12-07 | 2013-03-13 | 浙江昱能光伏科技集成有限公司 | DC-AC (direct current to alternating current) power conversion device |
| CN106026742A (en) * | 2016-07-21 | 2016-10-12 | 江苏博斯特新能源技术有限公司 | Multichannel photovoltaic power generation micro-inverter with high frequency isolation link |
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