CN202221969U - Photovoltaic grid-connected inverter circuit topological structure - Google Patents
Photovoltaic grid-connected inverter circuit topological structure Download PDFInfo
- Publication number
- CN202221969U CN202221969U CN 201120337865 CN201120337865U CN202221969U CN 202221969 U CN202221969 U CN 202221969U CN 201120337865 CN201120337865 CN 201120337865 CN 201120337865 U CN201120337865 U CN 201120337865U CN 202221969 U CN202221969 U CN 202221969U
- Authority
- CN
- China
- Prior art keywords
- topological structure
- inverter
- circuit topological
- photovoltaic
- inverter circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Classifications
-
- 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
Landscapes
- Inverter Devices (AREA)
Abstract
The utility model relates to the technical field of the photovoltaic power generation, particularly a photovoltaic grid-connected inverter circuit topological structure, characterized in that: the photovoltaic grid-connected inverter circuit topological structure comprises: three mutually independent H bridge inverter units, wherein the three H bridge inverter units are connected in parallel and then connected with a photovoltaic battery array, a protective diode and a direct current capacitor to form a circuit, each H bridge inverter unit is respectively connected with a filter capacitor and a single-phase inverter transformer, the single-phase inverter transformer is connected to an electrical network, the H bridge inverter unit adopts the SPWM control mode and controls the phase difference of the sine wave in 120-degree phase angle. The photovoltaic grid-connected inverter circuit topological structure can be suitable for balancing the electrical network and not balancing the electrical network; the control algorithm is simple, mature, stable and reliable, a special large-size integrated circuit is not needed, simultaneously the filter is output by the inverter transformer with leakage inductance, a filter inductor is not needed, thus the volume and weight of the photovoltaic grid-connected inverter circuit topological structure are reduced.
Description
(1) technical field
The utility model relates to the photovoltaic power generation technology field, particularly a kind of photovoltaic combining inverter circuit topological structure.
(2) background technology
Solar photovoltaic interconnected inverter be with the direct current that solar cell sends be converted into and line voltage with the alternating current of homophase frequently, and realize both powering to the load, again to the equipment of grid generation.Photovoltaic combining inverter mainly is made up of the electronic power switch device, to electrical network electric energy is provided with the form of pulse-width modulation.The main circuit of existing photovoltaic combining inverter adopts three-phase inversion to add the topological structure of LC filtering.This circuit structure is simple, but only is applicable to the three-phase equilibrium electrical network, when there is imbalance in three phase network; Because three phase network unbalance voltage; Produce negative sequence voltage and negative-sequence current, make the inverter AC side produce harmonic wave, reduce grid supply quality; Influence inverter simultaneously and normally move, cause the electronic power switch device failure when serious.Though existing research has proposed many control algolithms to this circuit topological structure unbalanced power supply has been compensated; But control algolithm is complicated; Often need large-scale integrated circuit to realize (like DSP, FPGA etc.), increased the complexity and the design difficulty of system, reduced system reliability.Simultaneously, because the output AC side of inverter adopts LC filtering, often volume is heavy, heating is high for reactor L, power consumption is big, causes the inefficiency of inverter.
Thereby the circuit topological structure of existing photovoltaic combining inverter, there is following shortcoming and defect:
1, when three phase network was uneven, the inverter AC side produced harmonic wave, reduced grid supply quality, influenced inverter simultaneously and normally moved, and caused the electronic power switch device failure when serious;
Though 2 some control algolithms have proposed compensation scheme to unbalanced power supply, control algolithm is complicated, has increased the complexity and the design difficulty of system, has reduced system reliability;
3, reactor L volume is heavy, heating is high, power consumption is big, causes the inefficiency of inverter.
(3) summary of the invention
The utility model provides a kind of simple, ripe, stable, reliable photovoltaic combining inverter circuit topological structure of balance electrical network and uneven electrical network and control algolithm that is applicable in order to remedy the defective of prior art.
The utility model is realized through following technical scheme:
A kind of photovoltaic combining inverter circuit topological structure; It is characterized in that: comprise three separate H bridge inversion units; Connect to form circuit with photovoltaic battery array, protection diode and dc capacitor after the parallel connection of three H bridge inversion units; Each H bridge inversion unit connects filter capacitor and single-phase inversion transformer respectively, and the single-phase inversion transformer connects electrical network.
This photovoltaic combining inverter circuit topological structure, H bridge inversion unit adopts the SPWM control mode, and the control sine wave differs 120 degree phase angles.
The beneficial effect of the utility model is: this photovoltaic combining inverter circuit topological structure; Applicable to balance electrical network and uneven electrical network; Control algolithm is simple, ripe, stable, reliable, need not special large scale integrated circuit, exports filtering simultaneously and adopts the contravariant transformer with leakage inductance; Save filter inductance, reduced the volume and weight of equipment.
(4) description of drawings
Below in conjunction with accompanying drawing the utility model is further described.
Accompanying drawing 1 is the structural representation of the utility model photovoltaic combining inverter circuit topological structure.
Among the figure, 1 photovoltaic battery array, 2 protection diodes, 3 dc capacitors, 8 electrical networks, 9H bridge inversion unit, 10 single-phase inversion transformers, 11 filter capacitors.
(5) embodiment
Accompanying drawing is a kind of specific embodiment of the utility model.
Among Fig. 1; This photovoltaic combining inverter circuit topological structure; Comprise three separate H bridge inversion units 9; Three H bridge inversion unit 9 parallel connection backs connect to form circuit with photovoltaic battery array 1, protection diode 2 and dc capacitor 3, and each H bridge inversion unit 9 connects filter capacitor 11 and single-phase inversion transformer 10 respectively, and single-phase inversion transformer 10 connects electrical network 8.The direct current that photovoltaic battery array 1 is sent is through 3 chargings of 2 pairs of dc capacitors of protection diode; The effect of protection diode 2 is to prevent that photovoltaic battery array 1 polarity from connecing instead; If the polarity of photovoltaic battery array 1 connects instead; Then protect diode 2 to end, prevent, cause the damage of dc capacitor 3 and H bridge inversion unit 9 dc capacitor 3 reverse charges.Dc capacitor 3 is the ripple and the fluctuation of photovoltaic battery array output voltage smoothly, and provides inversion required direct current energy for H bridge inversion unit 9.Direct current on the dc capacitor 3 carries out the DC/AC conversion through H bridge inversion unit 9, becomes the alternating current with electrical network 8 same frequencys.H bridge inversion unit 9 adopts the SPWM control mode, and the control sine wave differs 120 degree phase angles.Grid-connected current after the inversion is connected to the grid 8 through single-phase inversion transformer 10 with filter capacitor 11 filtering and after isolating, and the user on the power supply network 8 uses.Owing to adopt 9 combinations of three H bridge inversion units, it is independent adjustable to adopt each of photovoltaic combining inverter of this circuit topological structure to export mutually, and applicable to balance electrical network and uneven electrical network, and control algolithm is simple, ripe, stable, reliable.
Claims (2)
1. photovoltaic combining inverter circuit topological structure; It is characterized in that: comprise three separate H bridge inversion units (9); Three H bridge inversion units (9) parallel connection back connects to form circuit with photovoltaic battery array (1), protection diode (2) and dc capacitor (3); Each H bridge inversion unit (9) connects filter capacitor (11) and single-phase inversion transformer (10) respectively, and single-phase inversion transformer (10) connects electrical network (8).
2. photovoltaic combining inverter circuit topological structure according to claim 1 is characterized in that: H bridge inversion unit (9) adopts the SPWM control mode, and the control sine wave differs 120 degree phase angles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120337865 CN202221969U (en) | 2011-09-09 | 2011-09-09 | Photovoltaic grid-connected inverter circuit topological structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120337865 CN202221969U (en) | 2011-09-09 | 2011-09-09 | Photovoltaic grid-connected inverter circuit topological structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202221969U true CN202221969U (en) | 2012-05-16 |
Family
ID=46043988
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120337865 Expired - Fee Related CN202221969U (en) | 2011-09-09 | 2011-09-09 | Photovoltaic grid-connected inverter circuit topological structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202221969U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103904654A (en) * | 2014-03-11 | 2014-07-02 | 西安理工大学 | Combined three-phase inverter circuit parallel operation control method |
| CN104660088A (en) * | 2015-03-04 | 2015-05-27 | 王曙光 | Variable-frequency inverter system for photovoltaic power generation |
| CN105024575A (en) * | 2015-08-13 | 2015-11-04 | 南京亚派科技股份有限公司 | Subway energy feedback apparatus |
-
2011
- 2011-09-09 CN CN 201120337865 patent/CN202221969U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103904654A (en) * | 2014-03-11 | 2014-07-02 | 西安理工大学 | Combined three-phase inverter circuit parallel operation control method |
| CN103904654B (en) * | 2014-03-11 | 2016-02-24 | 西安理工大学 | Three-phase combined inverter bridge circuit parallel Operation Control method |
| CN104660088A (en) * | 2015-03-04 | 2015-05-27 | 王曙光 | Variable-frequency inverter system for photovoltaic power generation |
| CN105024575A (en) * | 2015-08-13 | 2015-11-04 | 南京亚派科技股份有限公司 | Subway energy feedback apparatus |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104821607B (en) | A kind of photovoltaic micro Power balance control method based on three end Collaborative Control | |
| CN102097966A (en) | Cascade megawatt photovoltaic grid-connected inverter | |
| CN103023344B (en) | A kind of general intelligent grid power electronic equipment | |
| CN103915856B (en) | A kind of base station is grid-connected-charging photovoltaic micro-inverter system and control method thereof | |
| CN201616680U (en) | Energy-feedback power grid energy-saving direct-current electronic load | |
| CN202841003U (en) | Novel three-phase photovoltaic grid-connected inverter system structure | |
| CN104467509B (en) | A kind of bidirectional energy-storage current transformer | |
| CN106411161B (en) | Three-Phase PWM Converter and its optimal control method under the conditions of a kind of Voltage unbalance | |
| WO2012152072A1 (en) | Solar energy photovoltaic three-phase micro-inverter and solar energy photovoltaic generating system | |
| CN102790422A (en) | Uninterrupted power supply (UPS) charging module device and control method thereof | |
| WO2012010053A1 (en) | Transformer-less static synchronous compensator (statcom) topological structure based on modular multilevel converter (mmc) | |
| CN203859583U (en) | Multipath parallel redundant substation DC power supply system | |
| CN206992699U (en) | The power quality controlling device of pre-charge circuit is carried suitable for super capacitor energy-storage | |
| CN202712876U (en) | Solar photovoltaic microgrid grid-connected power generation system | |
| CN103618327A (en) | Large power energy storage current transformer and main circuit thereof | |
| CN103066877B (en) | The unbalanced high-frequency isolation type inverter of a kind of anti-threephase load | |
| TW201414171A (en) | Single-phase three-wire three-port power converter system | |
| CN202221969U (en) | Photovoltaic grid-connected inverter circuit topological structure | |
| CN202435113U (en) | Inverter auxiliary power supply electricity-getting circuit | |
| CN202712946U (en) | UPS charging module device | |
| CN201789335U (en) | Unconventional high-power uninterruptable power source | |
| CN101656428A (en) | Solar energy photovoltaic system and application method thereof | |
| CN203398798U (en) | Large power energy storage converter and main circuit thereof | |
| CN207339294U (en) | The gird-connected inverter of current source/voltage source double mode output | |
| CN107147319B (en) | Non-isolated photovoltaic grid-connected inverter, photovoltaic grid-connected power generation system and control method |
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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120516 Termination date: 20180909 |