CN108233754A - A kind of gird-connected inverter - Google Patents
A kind of gird-connected inverter Download PDFInfo
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- CN108233754A CN108233754A CN201810107920.1A CN201810107920A CN108233754A CN 108233754 A CN108233754 A CN 108233754A CN 201810107920 A CN201810107920 A CN 201810107920A CN 108233754 A CN108233754 A CN 108233754A
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- coupling inductance
- gird
- switching
- coupling
- connected inverter
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- 230000008878 coupling Effects 0.000 claims abstract description 96
- 238000010168 coupling process Methods 0.000 claims abstract description 96
- 238000005859 coupling reaction Methods 0.000 claims abstract description 96
- 230000005611 electricity Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 5
- 241000596151 Iris domestica Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
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
-
- H02J3/383—
-
- 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
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
-
- 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
A kind of gird-connected inverter, including：Direct current input source, switching circuit, the first coupling inductance and the second coupling inductance, the positive and negative input terminal of switching circuit is connected respectively with the positive and negative end of direct current input source, switching circuit has the first output terminal and second output terminal, respectively by the first coupling inductance and the second coupling inductance access power grid, gird-connected inverter further includes the first capacitance and the second capacitance for the first output terminal of switching circuit and second output terminal.
Description
Technical field
The present invention relates to gird-connected inverter topologies field more particularly to a kind of non-isolated grid-connected inverters.
Background technology
In the parallel network reverse of the application scenario of middle low power parallel network reverse, particularly single-phase full bridge, imitated to improve conversion
Rate, mostly using non-isolated transformer device structure.Non-isolated photovoltaic grid-connected inverter possesses efficient, body compared to isolated form structure
Accumulate the advantages such as small, light-weight and at low cost.But it due to the presence of photovoltaic battery panel parasitic capacitance over the ground, is posted when inverter works
A common mode circuit is formed between raw capacitance and photovoltaic battery panel, inverter, power grid, the variation of common-mode voltage can cause capacitance to fill
The variation of electric discharge, so as to form leakage current (i.e. common mode current, as shown in Figure 1), the generation of leakage current can bring conduction and spoke
Blackberry lily is disturbed, the increase of grid current harmonic wave and loss or even jeopardizes equipment and personnel safety.
Invention content
The object of the present invention is to provide a kind of gird-connected inverters that can solve current leakage simple in structure.
In order to achieve the above objectives, the technical solution adopted by the present invention is：
A kind of gird-connected inverter, including：Direct current input source, switching circuit, the first coupling inductance and the second coupling inductance, institute
The positive and negative input terminal for stating switching circuit is connected respectively with the positive and negative end of direct current input source, and switching circuit has the first output terminal and the
Two output terminals, first output terminal of switching circuit and second output terminal pass through the first coupling inductance and the second coupling inductance respectively
Access power grid, which is characterized in that further include the first capacitance and the second capacitance；First coupling inductance has main coil and auxiliary
Coil, second coupling inductance have main coil and ancillary coil；
One end of the first coupling inductance main coil, one end of the first coupling inductance ancillary coil and the switch
First output terminal of circuit connects, and the other end of the first coupling inductance main coil and one end of power grid connect；
One end of the second coupling inductance main coil, one end of the second coupling inductance ancillary coil and the switch
The second output terminal of circuit connects, and the other end of the second coupling inductance main coil and the other end of power grid connect；
First capacitance is connected to the other end of the first coupling inductance ancillary coil and the switching circuit negative input
Between end；Second capacitance is connected to the other end of the second coupling inductance ancillary coil and the switching circuit negative input end
Between.
Further, the other end of the first coupling inductance main coil and the second coupling inductance main coil is another
Third capacitance is also associated between end.
Further, the switching circuit be using four switching devices full-bridge framework, described four switching devices
Respectively first switch device, second switch device, third switching device and the 4th switching device, the first switch device
And the second switch device is mutually concatenated and is connected between the positive and negative terminal of the direct current input source, third switch
Device and the 4th switching device are mutually concatenated and are connected between the positive and negative terminal of the direct current input source, described first
First output terminal of the common end of switching device and the second switch device for the switching circuit, third switch
Second output terminal of the common end of device and the 4th switching device for the switching circuit；
Further, the switching device is triode and the diode for being connected anti-parallel to the triode.
Further, the switching device for MOSFET and is connected anti-parallel to the diode of the MOSFET.
Further, the switching device for IGBT and is connected anti-parallel to the diode of the IGBT.
Further, four switching devices include two MOSFET, two IGBT and four diodes, each
MOSFET and each IGBT respectively with a diode reverse parallel connection.
Further, also there is EMI filter circuit between first coupling inductance, second coupling inductance, it is described
Two input terminals of EMI filter circuit connect the other end of the first coupling inductance main coil, second coupling inductance respectively
The other end of main coil, two output terminals of the EMI filter circuit connect the both ends of the power grid respectively.
Further, also there is EMI filter circuit between first coupling inductance, second coupling inductance, it is described
Two input terminals of EMI filter circuit connect the other end of the first coupling inductance main coil, second coupling inductance respectively
The other end of main coil, two output terminals of the EMI filter circuit connect the both ends of the power grid respectively.
Further, also there is EMI filter circuit between first coupling inductance, second coupling inductance, it is described
Two input terminals of EMI filter circuit connect the other end of the first coupling inductance main coil, second coupling inductance respectively
The other end of main coil, two output terminals of the EMI filter circuit connect the both ends of the power grid respectively.
Beneficial effects of the present invention are gird-connected inverter of the invention, and sensing is generated using the first and second coupling inductances
The induced electricity at electromotive force, and matching corresponding first and second capacitance, the first coupling inductance and the second coupling inductance both ends
Kinetic potential is added in the first capacitance and the second capacitance both ends, and then forms compensation electric current, and compensation electric current is introduced into leakage current circuit, right
Leakage current compensates, and so as to reduce leakage current and EMI, leakage current is made to reach in safe range, improves entire inverter
Safety.
Description of the drawings
The present invention is further described with reference to the accompanying drawings and examples.
Fig. 1 is a kind of photovoltaic combining inverter in the prior art.
Fig. 2 is a kind of gird-connected inverter first embodiment electrical block diagram of the present invention.
Fig. 3 is a kind of gird-connected inverter second embodiment electrical block diagram of the present invention.
Fig. 4 is a kind of gird-connected inverter 3rd embodiment electrical block diagram of the present invention.
Fig. 5 is a kind of gird-connected inverter fourth embodiment electrical block diagram of the present invention.
Fig. 6 be the present invention a kind of gird-connected inverter first to fourth embodiment in switching circuit structure schematic diagram.
Specific embodiment
Embodiment one
Embodiment one as shown in Figure 2, gird-connected inverter of the invention, including：Direct current input source DC, switching circuit,
One coupling inductance L1 and the second coupling inductance L2, the positive and negative input terminal of the switching circuit is respectively with direct current input source DC's
Positive and negative end is connected, and switching circuit has the first output terminal a and second output terminal b, the first output terminal of switching circuit a processes
First coupling inductance L1 accesses power grid, and the switching circuit second output terminal b accesses power grid by the second coupling inductance L2, should
Gird-connected inverter further includes the first capacitance C1 and the second capacitance C2；The first coupling inductance L1 has main coil N11 and auxiliary
Coil N12, the second coupling inductance L2 have main coil N21 and ancillary coil N22；
One end of the first coupling inductance L1 main coils N11, one end of the first coupling inductance L1 ancillary coils N12
Connect with the first output terminal a of the switching circuit, the other end of the first coupling inductance L1 main coils N11 and the one of power grid
End connects；
One end of the second coupling inductance L2 main coils N21, one end of the second coupling inductance L2 ancillary coils N22
Connect with the second output terminal b of the switching circuit, the other end of the second coupling inductance L2 main coils N21 and power grid it is another
One end connects；
The first capacitance C1 is connected to the other end of the first coupling inductance L1 ancillary coils N12 and the switching circuit
Between negative input end；The second capacitance C2 is connected to the other end of the second coupling inductance L2 ancillary coils N22 and described opens
Between powered-down road negative input end.
The gird-connected inverter of the present embodiment one uses two coupling inductances i.e. the first coupling inductance L1 and the second coupling inductance
L2, and use and the first coupling inductance L1 and matched first capacitances of the second coupling inductance L2 and the second capacitance so that the first coupling
The induced electromotive force for closing inductance L1 and the second coupling inductance L2 both ends is added in the first capacitance C1 and the second capacitance C2 both ends, is formed and mended
Electric current is repaid, above-mentioned compensation electric current is introduced into leakage current circuit, leakage current is compensated, so as to reduce leakage current and EMI,
Leakage current is made to reach in safe range, improves the safety of entire gird-connected inverter.
Embodiment two
The gird-connected inverter of embodiment two as shown in Figure 3, compared with embodiment one shown in Fig. 2, first coupling
Third is also associated between the other end of the other end of inductance L1 main coils N11 and the second coupling inductance L2 main coils N21
Capacitance C3, third capacitance C3 and the first coupling inductance L1 main coils N11 and the second coupling inductance L2 main coils N21
Form LCL type inversion output filter.
Compared to the gird-connected inverter of embodiment one, it is more preferable that the gird-connected inverter of embodiment two filters out high-frequency noise ability.
Embodiment three
The gird-connected inverter of embodiment three as shown in Figure 4, compared with embodiment one shown in Fig. 2, first coupling
Also there are EMI filter circuit, two input terminals point of the EMI filter circuit between inductance L1, the second coupling inductance L2
The other end of the first coupling inductance L1 main coils N11, the other end of the second coupling inductance L2 main coils N21 are not connect,
Two output terminals of the EMI filter circuit connect the both ends of the power grid respectively.
Compared to the gird-connected inverter of embodiment one, the gird-connected inverter of embodiment three increases EMI filter circuit, grid-connected
The EMI filter capacities of inverter are more preferable.
Example IV
The gird-connected inverter of example IV as shown in Figure 5, compared with embodiment illustrated in fig. 3 two, first coupling inductance
Also there is EMI filter circuit, two input terminals of the EMI filter circuit connect respectively between L1, the second coupling inductance L2
The other end of the other end of the first coupling inductance L1 main coils N11, the second coupling inductance L2 main coils N21, it is described
Two output terminals of EMI filter circuit connect the both ends of the power grid respectively.
Compared to the gird-connected inverter of embodiment one, the gird-connected inverter of example IV increases capacitance C3 and EMI filtering
Circuit, gird-connected inverter filters out high-frequency noise ability and EMI filter capacities are more preferable.
In the gird-connected inverter of the present embodiment one, two, three, four, it is preferable that the switching circuit is using four switches
The full-bridge framework of device, as shown in fig. 6, four switching devices be respectively first switch device Q1, second switch device Q2,
Third switching device Q3 and the 4th switching device Q4, the first switch device Q1 go here and there with the second switch device Q2 phases
It connects and is connected between the positive and negative terminal of the direct current input source DC, the third switching device Q3 and the described the 4th is opened
Device Q4 phases are closed to concatenate and be connected between the positive and negative terminal of the direct current input source DC, the first switch device Q1 and institute
The common end of the second switch device Q2 stated for the switching circuit the first output terminal a, the third switching device Q3 and
Second output terminal b of the common end of the 4th switching device Q4 for the switching circuit, Fig. 6 show that switching device Qn is
Switching tube Sn and be connected anti-parallel to the switching tube Sn diode Dn situation, wherein switching tube Sn for triode (n=1,2,
3,4)。
Preferably, switching tube Sn is MOSFET (n=1,2,3,4) in Fig. 6.
Preferably, switching tube Sn is IGBT (n=1,2,3,4) in Fig. 6.
Preferably, switching tube S1, S4 MOSFET in Fig. 6, switching tube S2, S3 IGBT.
Preferably, switching tube S1, S4 IGBT in Fig. 6, switching tube S2, S3 MOSFET.
Preferably, switching tube S1, S2 IGBT in Fig. 6, switching tube S3, S4 MOSFET.
Preferably, switching tube S1, S2 MOSFET in Fig. 6, switching tube S3, S4 IGBT.
Specific embodiments of the present invention described in detail above.It is to be understood that embodiments of the present invention and not only limiting
In these embodiments, the description of these embodiments is only used for the spirit for helping to understand the present invention.In disclosed spirit
Under, various change made for the present invention all should be within the scope of the present invention.The scope of patent protection of the present invention should be by
Appended claims limits.
Claims (10)
1. a kind of gird-connected inverter, including：Direct current input source, switching circuit, the first coupling inductance and the second coupling inductance, it is described
The positive and negative input terminal of switching circuit is connected respectively with the positive and negative end of direct current input source, and switching circuit has the first output terminal and second
Output terminal, first output terminal of switching circuit and second output terminal connect respectively by the first coupling inductance and the second coupling inductance
Enter power grid, which is characterized in that further include the first capacitance and the second capacitance；First coupling inductance has main coil and auxiliary line
Circle, second coupling inductance have main coil and ancillary coil；
One end of the first coupling inductance main coil, one end of the first coupling inductance ancillary coil and the switching circuit
The first output terminal connect, the other end of the first coupling inductance main coil and one end of power grid connect；
One end of the second coupling inductance main coil, one end of the second coupling inductance ancillary coil and the switching circuit
Second output terminal connect, the other end of the second coupling inductance main coil and the other end of power grid connect；
First capacitance be connected to the first coupling inductance ancillary coil the other end and the switching circuit negative input end it
Between；Second capacitance be connected to the second coupling inductance ancillary coil the other end and the switching circuit negative input end it
Between.
2. gird-connected inverter according to claim 1, it is characterised in that：The other end of the first coupling inductance main coil
Third capacitance is also associated between the other end of the second coupling inductance main coil.
3. gird-connected inverter according to claim 1 or 2, which is characterized in that the switching circuit is using four switches
The full-bridge framework of device, described four switching devices are respectively first switch device, second switch device, third switching device
With the 4th switching device, the first switch device mutually concatenates with the second switch device and is connected to the direct current
Between the positive and negative terminal of input source, the third switching device is mutually concatenated with the 4th switching device and is connected to described
Between the positive and negative terminal of direct current input source, the common end of the first switch device and the second switch device is opened to be described
The common end of first output terminal on powered-down road, the third switching device and the 4th switching device is the switch electricity
The second output terminal on road.
4. gird-connected inverter according to claim 3, which is characterized in that the switching device is triode and reverse parallel connection
In the diode of the triode.
5. gird-connected inverter according to claim 3, which is characterized in that the switching device is MOSFET and reverse parallel connection
In the diode of the MOSFET.
6. gird-connected inverter according to claim 3, which is characterized in that the switching device is IGBT and is connected anti-parallel to
The diode of the IGBT.
7. gird-connected inverter according to claim 3, four switching devices include two MOSFET, two IGBT with
And four diodes, each MOSFET and each IGBT respectively with a diode reverse parallel connection.
8. gird-connected inverter according to claim 1 or 2, which is characterized in that first coupling inductance, second coupling
Also there is EMI filter circuit between conjunction inductance, two input terminals of the EMI filter circuit connect first coupling inductance respectively
The other end of the other end of main coil, the second coupling inductance main coil, two output terminals difference of the EMI filter circuit
Connect the both ends of the power grid.
9. gird-connected inverter according to claim 3, which is characterized in that first coupling inductance, second coupling
Also there is EMI filter circuit, two input terminals of the EMI filter circuit meet the first coupling inductance master respectively between inductance
The other end of the other end of coil, the second coupling inductance main coil, two output terminals of the EMI filter circuit connect respectively
The both ends of the power grid.
10. gird-connected inverter according to claim 7, which is characterized in that first coupling inductance, second coupling
Also there is EMI filter circuit, two input terminals of the EMI filter circuit meet the first coupling inductance master respectively between inductance
The other end of the other end of coil, the second coupling inductance main coil, two output terminals of the EMI filter circuit connect respectively
The both ends of the power grid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810107920.1A CN108233754A (en) | 2018-02-02 | 2018-02-02 | A kind of gird-connected inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810107920.1A CN108233754A (en) | 2018-02-02 | 2018-02-02 | A kind of gird-connected inverter |
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| Publication Number | Publication Date |
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| CN108233754A true CN108233754A (en) | 2018-06-29 |
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ID=62669480
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810107920.1A Pending CN108233754A (en) | 2018-02-02 | 2018-02-02 | A kind of gird-connected inverter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114070116A (en) * | 2021-11-19 | 2022-02-18 | 株洲中车时代电气股份有限公司 | Single-phase full-bridge inverter main circuit and single-phase full-bridge inverter |
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| CN102655379A (en) * | 2011-03-01 | 2012-09-05 | 江苏博力电气科技有限公司 | Device used for restraining circumfluence in inverter parallel operation system |
| CN102857084A (en) * | 2012-09-28 | 2013-01-02 | 北京京仪绿能电力系统工程有限公司 | Circuit and method for restraining non-insulation type inverter common mode leakage current |
| US20130235628A1 (en) * | 2012-03-07 | 2013-09-12 | Dong Dong | Dc-side leakage current reduction for single phase full-bridge power converter/inverter |
| CN104868772A (en) * | 2015-05-12 | 2015-08-26 | 江苏固德威电源科技有限公司 | Single-phase low-power inverter applied to photovoltaic power generation system |
| US20170070163A1 (en) * | 2015-09-03 | 2017-03-09 | Majid Pahlevaninezhad | High efficiency inverter for distributed generation |
| CN208015613U (en) * | 2018-02-02 | 2018-10-26 | 青岛云路聚能电气有限公司 | A kind of gird-connected inverter |
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2018
- 2018-02-02 CN CN201810107920.1A patent/CN108233754A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102655379A (en) * | 2011-03-01 | 2012-09-05 | 江苏博力电气科技有限公司 | Device used for restraining circumfluence in inverter parallel operation system |
| US20130235628A1 (en) * | 2012-03-07 | 2013-09-12 | Dong Dong | Dc-side leakage current reduction for single phase full-bridge power converter/inverter |
| CN102857084A (en) * | 2012-09-28 | 2013-01-02 | 北京京仪绿能电力系统工程有限公司 | Circuit and method for restraining non-insulation type inverter common mode leakage current |
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| CN208015613U (en) * | 2018-02-02 | 2018-10-26 | 青岛云路聚能电气有限公司 | A kind of gird-connected inverter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114070116A (en) * | 2021-11-19 | 2022-02-18 | 株洲中车时代电气股份有限公司 | Single-phase full-bridge inverter main circuit and single-phase full-bridge inverter |
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Effective date of registration: 20221019 Address after: 2# workshop, Hefei Huilip Motor Co., Ltd., west of Fenghua West Road, Taohua Industrial Park, Hefei City, Anhui Province, 231200 Applicant after: Hefei Yunlu Juneng Electric Co.,Ltd. Address before: 266000 No. 97 Yanyang Road, Chengyang District, Qingdao City, Shandong Province Applicant before: QINGDAO YUNLU JUNENG ELECTRIC Co.,Ltd. |