CN204707055U - A kind of Novel photovoltaic grid-connected inverter - Google Patents
A kind of Novel photovoltaic grid-connected inverter Download PDFInfo
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- CN204707055U CN204707055U CN201520321843.1U CN201520321843U CN204707055U CN 204707055 U CN204707055 U CN 204707055U CN 201520321843 U CN201520321843 U CN 201520321843U CN 204707055 U CN204707055 U CN 204707055U
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- switching device
- inductance
- point
- inverter
- switching
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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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Abstract
A kind of Novel photovoltaic grid-connected inverter, in order to solve existing single-phase grid-connected inverter due to circuit topology and control method select not cause at that time that leakage current is large, technical problem at the bottom of efficiency, the technical method adopted is that input side has two derided capacitors, inversion module comprises 8 switching tubes and diodes in parallel, and outlet side comprises the first inductance, the second inductance and filter capacitor.The technique effect reached remains 0.5U in whole switching process
pV, can effectively eliminate common mode leakage current, make the level that the conversion efficiency of inverter and performance reach higher simultaneously.
Description
Technical field:
The utility model belongs to generating equipment technical field, relates to a kind of combining inverter, particularly a kind of Novel photovoltaic grid-connected inverter.
Background technology:
Combining inverter major function converts direct current energy to AC energy efficiently, is roughly divided into following a few class: photovoltaic combining inverter, wind power-generating grid-connected inverter, power-equipment combining inverter and other generating equipment combining inverters.At present, the main flow inverter in single-phase grid-connected inverter progressively market.If the circuit topology of this inverter and control method are selected incorrect, then common-mode voltage sum can be caused to be a variable, and then cause output common mode electric current excessive, safety threatens, and inverter efficiency and performance low.
Utility model content:
The purpose of this utility model is intended to solve existing single-phase grid-connected inverter and selects improper and leakage current that is that cause is large, technical problem at the bottom of efficiency due to circuit topology and control method, for this reason, the utility model proposes a kind of circuit topology of Novel photovoltaic grid-connected inverter, effect is that common-mode voltage remains 0.5U in whole switching process
pV, can effectively eliminate common mode leakage current, make the level that the conversion efficiency of inverter and performance reach higher simultaneously.
The concrete technical scheme that the utility model adopts is: a kind of Novel photovoltaic grid-connected inverter, comprise DC power supplier PV, inversion module and output filtering module, key is: described inversion module comprises 8 switching devices being connected to DC power supply PV two ends; First switching device K
1, second switch device K
2, the 3rd switching device K
3after series connection, and the electric capacity C of two series connection
d1, C
d2between the both positive and negative polarity being connected in DC power supply PV in parallel; 4th switching device K
4, the 5th switching device K
5, the 6th switching device K
6between the both positive and negative polarity being connected in series in DC power supply PV; 7th switching device K
7an end be connected to C
d1, C
d2mid point O point, the other end is connected to switching device K
1, K
2between; 8th switching device K
8an end be connected to C
d1, C
d2mid point O point, the other end is connected to switching device K
5, K
6between;
Output filtering module comprises the first inductance L
1, the second inductance L
2with filter capacitor C
0, the first inductance L
1one end be connected to second switch device K
2with the 3rd switching device K
3between A point, the second inductance L
2one end be connected to the 4th switching device K
4with the 5th switching device K
5between B point; First inductance L
1the other end and the second inductance L
2the other end be all connected to electrical network two ends; Filter capacitor C
0in parallel with electrical network.
The beneficial effects of the utility model are: in single-phase grid-connected inverter, the selection of each components and parts and compound mode, make the common-mode voltage sum of output remain 0.5U
pV, be a constant all the time, eliminate common mode leakage current, improve conversion efficiency and the performance of inverter simultaneously.
Inverter output voltage of the present utility model is three level, identical with the output voltage that unipolarity is modulated, and is compared to the H bridge of bipolar modulation, and the consume on the size of output inductor and inductance reduces greatly.In addition, switching device K
1, K2, K5, K6, K7, K8 voltage stress identical, are all 0.5U
pV, meanwhile, the dv/dt of all switching tubes is all 1/2 input voltages.Device power loss reduces, and inverter efficiency is improved.
Accompanying drawing illustrates:
Fig. 1 is circuit theory schematic diagram of the present utility model.
Current circuit schematic diagram when Fig. 2 is the utility model positive half cycle conducting.
Current circuit schematic diagram when Fig. 3 is the utility model positive half cycle afterflow.
Current circuit schematic diagram when Fig. 4 is the conducting of the utility model negative half period.
Current circuit schematic diagram when Fig. 5 is the afterflow of the utility model negative half period.
In accompanying drawing, PV represents DC power supply, K
1represent the first switching device, K
2represent second switch device, K
3represent the 3rd switching device, K
4represent the 4th switching device, K
5represent the 5th switching device, K
6represent the 6th switching device, K
7represent the 7th switching device, K
8represent the 8th switching device, D
1, D
2, D
3, D
4, D
5, D
6, D
7, D
8respectively with 8 antiparallel diodes of switching device, L
1represent the first inductance, L
2represent the second inductance, C
0represent filter capacitor.
Embodiment:
A kind of Novel photovoltaic grid-connected inverter, comprise DC power supplier PV, inversion module and output filtering module, key is: described inversion module comprises 8 switching devices being connected to DC power supply PV two ends; First switching device K
1, second switch device K
2, the 3rd switching device K
3after series connection, and the electric capacity C of two series connection
d1, C
d2between the both positive and negative polarity being connected in DC power supply PV in parallel; 4th switching device K
4, the 5th switching device K
5, the 6th switching device K
6between the both positive and negative polarity being connected in series in DC power supply PV; 7th switching device K
7an end be connected to C
d1, C
d2mid point O point, the other end is connected to switching device K
1, K
2between; 8th switching device K
8an end be connected to C
d1, C
d2mid point O point, the other end is connected to switching device K
5, K
6between.
Output filtering module comprises the first inductance L
1, the second inductance L
2with filter capacitor C
0, the first inductance L
1one end be connected to second switch device K
2with the 3rd switching device K
3between A point, the second inductance L
2one end be connected to the 4th switching device K
4with the 5th switching device K
5between B point; First inductance L
1the other end and the second inductance L
2the other end be all connected to electrical network two ends; Filter capacitor C
0in parallel with electrical network.
8 described switching devices are insulated gate bipolar transistor IGBT, or are metal-oxide layer-semiconductor-field-effect transistor MOSFET.
The utility model is in the specific implementation: when grid current positive half period, the first switching device K
1, second switch device K
2, the 5th switching device K
5, the 6th switching device K
6conducting, rest switch device turns off.Electric current, from the positive pole of DC power supplier PV, flows through the first switching device K
1, second switch device K
2, the first inductance L
1, electrical network, the second inductance L
2, the 5th switching device K
5, the 6th switching device K
6, flow back into the negative pole of DC power supply PV, as shown in Figure 2.During freewheeling state, inductive current then flows through the first inductance L
1, electrical network, the second inductance L
25th switching device K
5, diode D
8, diode D
7, second switch device K
2, as shown in Figure 3.
When the negative half-cycle of grid current, electric current, from the positive pole of DC voltage-stabilizing module PV, flows through the 4th switching device K
4, the second inductance L
2, electrical network, the first inductance L
1, the 3rd switching device K
3, flow back into the negative pole of DC voltage-stabilizing module PV, switching device K
7with switching device K
8conducting, but do not have electric current to flow through, as shown in Figure 4.During freewheeling state, switching device K
7and K
8still conducting, rest switch device all turns off, and inductive current then flows through the second inductance L
2, electrical network, the first inductance L
1, diode D
2, the 7th switching device K
7, the 8th switching device K
8, diode D
5, as shown in Figure 5.
The common-mode voltage sum of this single-phase grid-connected inverter output remains a constant, and common mode current is effectively suppressed, and improves conversion efficiency and the performance of inverter simultaneously.
Claims (3)
1. a Novel photovoltaic grid-connected inverter, comprises DC power supplier PV, inversion module and output filtering module, it is characterized in that: described inversion module comprises 8 switching devices being connected to DC power supply PV two ends; First switching device K
1, second switch device K
2, the 3rd switching device K
3after series connection, and the electric capacity C of two series connection
d1, C
d2between the both positive and negative polarity being connected in DC power supply PV in parallel; 4th switching device K
4, the 5th switching device K
5, the 6th switching device K
6between the both positive and negative polarity being connected in series in DC power supply PV; 7th switching device K
7an end be connected to C
d1, C
d2mid point O point, the other end is connected to switching device K
1, K
2between; 8th switching device K
8an end be connected to C
d1, C
d2mid point O point, the other end is connected to switching device K
5, K
6between;
Output filtering module comprises the first inductance L
1, the second inductance L
2with filter capacitor C
0, the first inductance L
1one end be connected to second switch device K
2with the 3rd switching device K
3between A point, the second inductance L
2one end be connected to the 4th switching device K
4with the 5th switching device K
5between B point; First inductance L
1the other end and the second inductance L
2the other end be connected to electrical network two ends; Filter capacitor C
0in parallel with electrical network.
2. a kind of Novel photovoltaic grid-connected inverter according to claim 1, is characterized in that: the first described switching device K
1, second switch device K
2, the 3rd switching device K
3, the 4th switching device K
4, the 5th switching device K
5, the 6th switching device K
6, the 7th switching device K
7with the 8th switching device K
8the equal reverse parallel connection in two ends have diode, they are D respectively
1, D
2, D
3, D
4, D
5, D
6, D
7and D
8.
3. a kind of Novel photovoltaic grid-connected inverter according to claim 1, is characterized in that: 8 described switching devices are insulated gate bipolar transistor IGBT, or is metal-oxide layer-semiconductor-field-effect transistor MOSFET.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520321843.1U CN204707055U (en) | 2015-05-18 | 2015-05-18 | A kind of Novel photovoltaic grid-connected inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520321843.1U CN204707055U (en) | 2015-05-18 | 2015-05-18 | A kind of Novel photovoltaic grid-connected inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204707055U true CN204707055U (en) | 2015-10-14 |
Family
ID=54286647
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520321843.1U Expired - Fee Related CN204707055U (en) | 2015-05-18 | 2015-05-18 | A kind of Novel photovoltaic grid-connected inverter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108390583A (en) * | 2018-02-12 | 2018-08-10 | 南京邮电大学 | One kind ten switchs the non-isolated photovoltaic DC-to-AC converter topological structure of Clamp three-phase |
| CN108667070A (en) * | 2018-04-28 | 2018-10-16 | 杭州电子科技大学 | A kind of three-phase grid-connected converter control device |
| CN117040307A (en) * | 2023-09-27 | 2023-11-10 | 大秦数字能源技术股份有限公司 | Inverter circuit, inverter and inversion method |
-
2015
- 2015-05-18 CN CN201520321843.1U patent/CN204707055U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108390583A (en) * | 2018-02-12 | 2018-08-10 | 南京邮电大学 | One kind ten switchs the non-isolated photovoltaic DC-to-AC converter topological structure of Clamp three-phase |
| CN108390583B (en) * | 2018-02-12 | 2019-11-29 | 南京邮电大学 | One kind ten switchs the non-isolated photovoltaic DC-to-AC converter topological structure of Clamp three-phase |
| CN108667070A (en) * | 2018-04-28 | 2018-10-16 | 杭州电子科技大学 | A kind of three-phase grid-connected converter control device |
| CN108667070B (en) * | 2018-04-28 | 2021-02-19 | 杭州电子科技大学 | Three-phase grid-connected converter control device |
| CN117040307A (en) * | 2023-09-27 | 2023-11-10 | 大秦数字能源技术股份有限公司 | Inverter circuit, inverter and inversion method |
| CN117040307B (en) * | 2023-09-27 | 2023-12-19 | 大秦数字能源技术股份有限公司 | Inverter circuit, inverter and inversion method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151014 Termination date: 20160518 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |