CN104410102A - Multi-H6-bridge grid-connected inverter doubling circuit - Google Patents
Multi-H6-bridge grid-connected inverter doubling circuit Download PDFInfo
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- CN104410102A CN104410102A CN201410668481.3A CN201410668481A CN104410102A CN 104410102 A CN104410102 A CN 104410102A CN 201410668481 A CN201410668481 A CN 201410668481A CN 104410102 A CN104410102 A CN 104410102A
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- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
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- 239000008280 blood Substances 0.000 description 1
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- 239000006185 dispersion Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
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- 238000010248 power generation Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
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- H02J3/383—
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
- H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters
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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
Abstract
The invention provides a multi-H6-bridge grid-connected inverter doubling circuit. The multi-H6-bridge grid-connected inverter doubling circuit comprises a capacitor, an alternating current and N H6 bridge grid-connected inverter circuits; output filter inductors are connected to both ends of the alternating current; the N H6 bridge grid-connected inverter circuits are arranged between the capacitor and the alternating current, and each H6 bridge grid-connected inverter circuit comprises a first transistor set and a second transistor set which are connected in parallel, wherein each transistor set comprises three transistors which are connected in series; a first node between two transistors in the first transistor set is connected with one input end of the alternating current, and a second node between the two transistors in the second transistor set is connected with the other input end of the alternating current; and diodes are arranged between the first node and the third node between the two transistors in the second transistor set and the second node and the fourth node between the two transistors in the first transistor set. The multi-H6-bridge grid-connected inverter doubling circuit has the advantages that the working reliability of a grid-connected inverter is effectively improved.
Description
Technical field
The present invention relates to circuit design field, be specifically related to a kind of multiple H6 bridge parallel network reverse frequency multiplier circuit.
Background technology
Along with popularizing rapidly of distributed power generation, the status of inverter in solar power system is more remarkable, and the improvement of its performance is for improving efficiency, the reliability of system and having reduced costs vital effect.Non-isolated photovoltaic grid-connected inverter has that conversion efficiency is high, volume is little, low cost and other advantages, is therefore widely used in photovoltaic parallel in system field.
Traditional main power of middle low power solar grid-connected inverter is all made up of booster circuit and inverter circuit two parts substantially, when parallel network reverse power is larger or independent MPPT (Maxi mum Power Point Tracking, MPPT maximum power point tracking) the less situation photovoltaic battery panel of way will increase by the impact of wooden pail effect, causes the overall energy output of photovoltaic parallel in system to decline.Along with the development of distributed photovoltaic combining inverter, prime booster circuit generally can depart from combining inverter and be designed to multiple independently MPPT unit module, such site operation personnel can be connected multiple independently MPPT unit module with building circumstance of occlusion by the setting angle different according to solar panel, and the finally output of these independently MPPT unit modules can be connected on the dc-link capacitance of combining inverter by unified.
Two kinds of inversion frameworks are often related to this distributed grid-connected inverter that can improve generating efficiency: 1, multiple independently MPPT module is all connected on same grid-connected inverter circuit, such grid-connected inverter circuit power will increase, along with the increase of power is in order to reduce inversion consumption, reduce switching tube heating, the general operating frequency that all can reduce switching tube, choose the switch module that cost is higher, but along with the decline of switching tube operating frequency, can be more and more higher to the volume of filter inductance and cost requirement, the ripple of rear class output current also can become large, the impact to electrical network can be caused like this, increase the high order harmonic component interference of electrical network.2, multiple independently MPPT module dispersion is connected on different grid-connected inverter circuits, framework is equivalent to multiple combining inverter independent in parallel to mains supply, in this framework, in order to reduce grid-connected current ripple, switching frequency generally can be very high, require stricter to the sensibility reciprocal of filter inductance, so also can cause the rising of inverter cost, inevitably circulation can be there is between different inverter, if circulation is larger, can pollute and the line voltage of site annex, the situation of inverter cisco unity malfunction also happens occasionally.
Summary of the invention
Invention provides a kind of H6 bridge parallel network reverse frequency multiplier circuit, wherein, comprising:
Electric capacity (C);
Alternating current, the two ends of this alternating current are all connected with an output inductor (L1, L2);
N number of H6 bridge grid-connected inverter circuit, be arranged between electric capacity (C) and alternating current (AC), each H6 bridge grid-connected inverter circuit includes the first transistor group in parallel and transistor seconds group, and each transistor group includes three transistors be in series;
Wherein, two transistor (Gn1 in the first transistor group, Gn3) first node (N1) between connects an input of alternating current, Section Point (N2) between two transistors (Gn2, Gn4) in transistor seconds group connects another input of alternating current;
Between the 3rd node (N3) between two transistors in first node (N1) and transistor seconds group, and be provided with a diode between the 4th node (N4) between two transistors in Section Point (N2) and the first transistor group; N is positive integer.
Above-mentioned H6 bridge parallel network reverse frequency multiplier circuit, wherein, each described H6 bridge grid-connected inverter circuit also comprises two inductance, wherein an inductance is arranged between the output of first node (N1) and the corresponding alternating current connected, and another inductance is arranged between the output of Section Point (N2) and the corresponding alternating current connected.
Above-mentioned H6 bridge parallel network reverse frequency multiplier circuit, wherein, the triangular wave phase that each H6 bridge inverter circuit produces PWM differs 360 °/N successively, and the current ripples outputted in electrical network is N times of switching frequency.
Above-mentioned H6 bridge parallel network reverse frequency multiplier circuit, wherein, each H6 bridge grid-connected inverter circuit exports the grid-connected current of identical amplitude and phase place respectively.
Above-mentioned H6 bridge parallel network reverse frequency multiplier circuit, wherein, is all formed with a diode between the source electrode of each described transistor and drain electrode.
Above-mentioned H6 bridge parallel network reverse frequency multiplier circuit, wherein, each H6 bridge grid-connected inverter circuit output current is all identical.
Above-mentioned H6 bridge parallel network reverse frequency multiplier circuit, wherein, described electric capacity is dc-link capacitance.
Above-mentioned H6 bridge parallel network reverse frequency multiplier circuit, wherein, described N number of H6 bridge grid-connected inverter circuit is connected in parallel between described electric capacity and described alternating current.
The present invention compares prior art, reduces the capacitance of switching tube operating frequency and level filter capacitor, and can reduce output ripple.Contrast the first above-mentioned parallel network reverse framework, switching tube operating frequency can be lower, and loss can reduce, but grid-connected current ripple significantly reduces on the contrary; Compare the second parallel network reverse framework, switching tube operating frequency can significantly reduce, filtering inductance decline cost can reduce, grid-connected current ripple also can reduce, and the circulation phenomenon existed between different inverter also can reduce, and improves the reliability of combining inverter work.
Accompanying drawing explanation
By reading the detailed description done non-limiting example with reference to the following drawings, the present invention and feature, profile and advantage will become more obvious.Mark identical in whole accompanying drawing indicates identical part.Deliberately proportionally do not draw accompanying drawing, focus on purport of the present invention is shown.
Fig. 1 is multiple H6 bridge parallel network reverse inductive current N frequency multiplier circuit schematic diagrames;
Fig. 2 is the sequential chart of single H6 bridge inverter circuit switching tube;
Fig. 3 is two H6 bridge inverter currents HF switch pipe sequential and inductive currents when the positive half cycle of civil power.
Embodiment
In the following description, a large amount of concrete details is given to provide more thorough understanding of the invention.But, it is obvious to the skilled person that the present invention can be implemented without the need to these details one or more.In other example, in order to avoid obscuring with the present invention, technical characteristics more well known in the art are not described.
In order to thoroughly understand the present invention, detailed step and detailed structure will be proposed in following description, to explain technical scheme of the present invention.Preferred embodiment of the present invention is described in detail as follows, but except these are described in detail, the present invention can also have other execution modes.
In order to realize above-mentioned technique effect, the invention provides a kind of H6 bridge (6 switch non-isolated photovoltaic grid-connected inverters, can referred to as H6 bridge) parallel network reverse frequency multiplier circuit, comprising:
Electric capacity C, optional but unrestricted, this electric capacity C is dc-link capacitance;
Alternating current (or civil power) AC, the two ends of this alternating current are all connected with output inductor L1 and L2, and wherein in diagram, i represents the sense of current;
N number of H6 bridge grid-connected inverter circuit B1, is arranged between electric capacity C and alternating current AC, and each H6 bridge grid-connected inverter circuit B1 includes the first transistor group A1 in parallel and transistor seconds group A2, and each transistor group includes three transistors be in series.In the present invention, the first transistor group A1 comprises the first transistor Gn1, third transistor Gn3, the 5th transistor Gn5, transistor seconds group A2 comprise transistor seconds Gn2, the 4th transistor Gn4, the 6th transistor Gn6.Wherein, N is positive integer.
The first transistor Gn1 and and the third transistor Gn3 be connected between there is first node N1, third transistor Gn3 and and the 5th transistor Gn5 be connected between there is the 4th node N4; Transistor seconds Gn2 and and the 4th transistor Gn4 be connected between there is Section Point N2, the 4th transistor Gn4 and and the 6th transistor Gn6 be connected between there is the 3rd node N3.Wherein, first node N1 connects an input of alternating current, and Section Point N2 connects another input of alternating current.Between first node N1 and the 3rd node N3, be provided with the first diode D1; The second diode D2 is provided with between Section Point N2 and the 4th node N4.
In the present invention one optional embodiment, each H6 bridge grid-connected inverter circuit B1 also comprises two inductance L n1, Ln2, wherein an inductance L n1 is arranged between the output of first node N1 and the corresponding alternating current AC connected, and another inductance L n2 is arranged between the output of Section Point N2 and the corresponding alternating current AC connected.
In the present invention one optional embodiment, above-mentioned each H6 bridge inverter circuit B1 produces PWM (Pulse Width Modulation, pulse width modulation) triangular wave phase differ 360 °/N successively, the current ripples outputted in electrical network be the N of switching frequency doubly.It should be noted that at this, when N is the multiple of 3 or 3, so, then there is not ripple in the electric current outputted in electrical network.
In the present invention one optional embodiment, above-mentioned each H6 bridge grid-connected inverter circuit exports the grid-connected current of identical amplitude and phase place respectively.
In the present invention one optional embodiment, between the source electrode of above-mentioned each transistor and drain electrode, be all formed with a diode.
In the present invention one optional embodiment, the reference size of each H6 bridge grid-connected inverter circuit output current is all identical, the combining inverter parallel connection being equivalent to N platform equal-wattage uses, but each H6 bridge High frequency filter inductance value can obtain less than originally, as long as ensure that each H6 bridge inverter circuit is just passable under being operated in continuous current mode.
In the present invention one optional embodiment, above-mentioned N number of H6 bridge grid-connected inverter circuit is connected in parallel between described electric capacity and described alternating current.
Please refer to below shown in Fig. 2, within the t1 time period, one end that alternating current AC is connected with inductance L 1 exports forward signal, one end that alternating current AC is connected with inductance L 2 exports reverse signal, the synchronous high frequency of transistor G11, G16 is opened or is turned off, G14 conducting, and transistor G12, G15, G13 are turned off.And within the t2 time period, due to signal upset, each transistor opened/closed state is contrary with in the t1 time period, do not repeat them here.
Fig. 3 gives multiple H6 bridge parallel network reverse inductive current N frequency multiplier circuit and adopts main HF switch pipe G11, G16, G21, G26 duty ratio conducting waveform corresponding to two phase, 180 ° of triangular signals, positive half cycle and the current ripples waveform of filter inductance corresponded and final grid-connected current ripple schematic diagram when grid-connected positive half cycle exports.Transistor G11, G16 keep identical sequential, and transistor G21, G26 (not shown) has identical sequential.
Owing to have employed as above technical scheme, be equivalent to unify to control opportunity to the work of the switching tube in the inverter circuit of the second connect-in strategy of the prior art, switching tube operating frequency can be lower, because output ripple significantly can reduce along with the increase of shunt chopper quantity, and the capacitance of filter capacitor also can significantly reduce thereupon.Contrast the first above-mentioned parallel network reverse framework, switching tube operating frequency can be lower, and loss can reduce, but grid-connected current ripple significantly reduces on the contrary; Compare the second parallel network reverse framework, switching tube operating frequency can significantly reduce, filtering inductance decline cost can reduce, grid-connected current ripple also can reduce, and the circulation phenomenon existed between different inverter also can reduce, and improves the reliability of combining inverter work.
Above preferred embodiment of the present invention is described.It is to be appreciated that the present invention is not limited to above-mentioned particular implementation, the equipment wherein do not described in detail to the greatest extent and structure are construed as to be implemented with the common mode in this area; Any those of ordinary skill in the art, do not departing under technical solution of the present invention ambit, the Method and Technology content of above-mentioned announcement all can be utilized to make many possible variations and modification to technical solution of the present invention, or being revised as the Equivalent embodiments of equivalent variations, this does not affect flesh and blood of the present invention.Therefore, every content not departing from technical solution of the present invention, according to technical spirit of the present invention to any simple modification made for any of the above embodiments, equivalent variations and modification, all still belongs in the scope of technical solution of the present invention protection.
Claims (8)
1. a H6 bridge parallel network reverse frequency multiplier circuit, is characterized in that, comprising:
Electric capacity (C);
Alternating current, the two ends of this alternating current are all connected with an output inductor (L1, L2);
N number of H6 bridge grid-connected inverter circuit, be arranged between electric capacity (C) and alternating current (AC), each H6 bridge grid-connected inverter circuit includes the first transistor group in parallel and transistor seconds group, and each transistor group includes three transistors be in series;
Wherein, two transistor (Gn1 in the first transistor group, Gn3) first node (N1) between connects an input of alternating current, Section Point (N2) between two transistors (Gn2, Gn4) in transistor seconds group connects another input of alternating current;
Between the 3rd node (N3) between two transistors in first node (N1) and transistor seconds group, and be provided with a diode between the 4th node (N4) between two transistors in Section Point (N2) and the first transistor group;
N is positive integer.
2. H6 bridge parallel network reverse frequency multiplier circuit as claimed in claim 1, it is characterized in that, each described H6 bridge grid-connected inverter circuit also comprises two inductance, wherein an inductance is arranged between the output of first node (N1) and the corresponding alternating current connected, and another inductance is arranged between the output of Section Point (N2) and the corresponding alternating current connected.
3. H6 bridge parallel network reverse frequency multiplier circuit as claimed in claim 1, is characterized in that, the triangular wave phase that each H6 bridge inverter circuit produces PWM differs 360 successively
°/ N, the current ripples outputted in electrical network is N times of switching frequency.
4. H6 bridge parallel network reverse frequency multiplier circuit as claimed in claim 1, it is characterized in that, each H6 bridge grid-connected inverter circuit exports the grid-connected current of identical amplitude and phase place respectively.
5. H6 bridge parallel network reverse frequency multiplier circuit as claimed in claim 1, is characterized in that, is all formed with a diode between the source electrode of each described transistor and drain electrode.
6. H6 bridge parallel network reverse frequency multiplier circuit as claimed in claim 1, it is characterized in that, each H6 bridge grid-connected inverter circuit output current is identical.
7. H6 bridge parallel network reverse frequency multiplier circuit as claimed in claim 1, it is characterized in that, described electric capacity is dc-link capacitance.
8. H6 bridge parallel network reverse frequency multiplier circuit as claimed in claim 1, it is characterized in that, described N number of H6 bridge grid-connected inverter circuit is connected in parallel between described electric capacity and described alternating current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410668481.3A CN104410102A (en) | 2014-11-20 | 2014-11-20 | Multi-H6-bridge grid-connected inverter doubling circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410668481.3A CN104410102A (en) | 2014-11-20 | 2014-11-20 | Multi-H6-bridge grid-connected inverter doubling circuit |
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| CN104410102A true CN104410102A (en) | 2015-03-11 |
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| CN201410668481.3A Pending CN104410102A (en) | 2014-11-20 | 2014-11-20 | Multi-H6-bridge grid-connected inverter doubling circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109742969A (en) * | 2019-01-11 | 2019-05-10 | 北京机械设备研究所 | One kind being based on magnetic-coupled three-phase inverter |
| CN113572385A (en) * | 2021-06-17 | 2021-10-29 | 江苏固德威电源科技股份有限公司 | Inverter circuit |
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| JP2012182868A (en) * | 2011-02-28 | 2012-09-20 | Kyocera Corp | Photovoltaic power generator |
| US20120257422A1 (en) * | 2011-04-08 | 2012-10-11 | Tae Won Lee | Dc/dc converter and electric generating system using solar cell having the same |
| CN103560746A (en) * | 2013-11-21 | 2014-02-05 | 东南大学 | Multi-parallel inverter motor speed regulating system and control method thereof |
| CN103972906A (en) * | 2014-05-06 | 2014-08-06 | 中国电子科技集团公司第四十一研究所 | Reactive power control method of non-isolated single-phase photovoltaic grid-connected inverter |
| CN104158212A (en) * | 2014-08-06 | 2014-11-19 | 电子科技大学 | Topological structure of multi-level photovoltaic power generation system and control method of topological structure |
-
2014
- 2014-11-20 CN CN201410668481.3A patent/CN104410102A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012182868A (en) * | 2011-02-28 | 2012-09-20 | Kyocera Corp | Photovoltaic power generator |
| US20120257422A1 (en) * | 2011-04-08 | 2012-10-11 | Tae Won Lee | Dc/dc converter and electric generating system using solar cell having the same |
| CN103560746A (en) * | 2013-11-21 | 2014-02-05 | 东南大学 | Multi-parallel inverter motor speed regulating system and control method thereof |
| CN103972906A (en) * | 2014-05-06 | 2014-08-06 | 中国电子科技集团公司第四十一研究所 | Reactive power control method of non-isolated single-phase photovoltaic grid-connected inverter |
| CN104158212A (en) * | 2014-08-06 | 2014-11-19 | 电子科技大学 | Topological structure of multi-level photovoltaic power generation system and control method of topological structure |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109742969A (en) * | 2019-01-11 | 2019-05-10 | 北京机械设备研究所 | One kind being based on magnetic-coupled three-phase inverter |
| CN113572385A (en) * | 2021-06-17 | 2021-10-29 | 江苏固德威电源科技股份有限公司 | Inverter circuit |
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