CN202353234U - Low-voltage ride through circuit of photovoltaic inverter - Google Patents
Low-voltage ride through circuit of photovoltaic inverter Download PDFInfo
- Publication number
- CN202353234U CN202353234U CN2011204772614U CN201120477261U CN202353234U CN 202353234 U CN202353234 U CN 202353234U CN 2011204772614 U CN2011204772614 U CN 2011204772614U CN 201120477261 U CN201120477261 U CN 201120477261U CN 202353234 U CN202353234 U CN 202353234U
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- China
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- photovoltaic
- voltage
- capacitor
- rectifier module
- converter
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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 utility model relates to a low-voltage ride through circuit of a photovoltaic inverter, and the circuit comprises a rectifier module D4, a capacitor C1, a diode D2 and a current-limiting resistor R1; the grid connection end J1 of the photovoltaic inverter is connected with the rectifier module D4; a positive pole which is rectified by the rectifier module D4 is connected to the positive end of a contactor coil J2 of the photovoltaic inverter, and simultaneously is connected with the positive pole of the capacitor C1 through the resistor R1; the positive pole of the C1 is connected to the positive end of the contactor coil of the photovoltaic inverter through the diode D2; and the negative end of the contactor coil is connected with the negative pole which is rectified by the rectifier module D4 and the negative pole of the capacitor C1. When the 270V voltage at the joint of the grid connection end J1 of the photovoltaic inverter suddenly falls, the electrolysis capacitor C1 supplies power to the contactor coil which is connected with the J2 through the diode D2, so that the voltage of the coil is no lower than the lowest working voltage within a period of time, and the inverter is connected with a grid. According to the low-voltage ride through circuit of the photovoltaic inverter, the realizing cost is extremely low, and the work is very reliable.
Description
Technical field
The utility model relates to a kind of low-voltage and passes through circuit, relates in particular to a kind of photovoltaic DC-to-AC converter low-voltage and passes through circuit.
Background technology
Solar energy power generating can occupy the important seat of world energy sources consumption in the near future, not only will substitute the part conventional energy resource, and will become the main body of world energy supplies.Expect the year two thousand thirty, regenerative resource will account for more than 30% in the total energy structure, and the accounting of solar energy power generating in world's total electricity supply also will reach more than 10%; To the year two thousand forty, regenerative resource will account for more than 50% of total energy consumption, and solar energy power generating will account for more than 20% of total electricity; To 21 century Mo, regenerative resource will account in energy resource structure more than 80%, and solar power generation will account for more than 60%.These numerals are enough to demonstrate the development prospect of solar energy industry and in the energy field important strategic position.The photovoltaic grid-connected inversion power supply, promptly photovoltaic combining inverter is the core part of grid-connected photovoltaic system, it with the direct current energy inversion of solar panel be AC energy safe and reliable feed back to electrical network.Jumbo photo-voltaic power generation station floor space is all very big, and most of power station of domestic construction all is in abominable countryside of environment or mountain area, so the reliability of photovoltaic DC-to-AC converter needs more the guarantee.Low-voltage is passed through (LVRT), refers to when the point voltage that is incorporated into the power networks falls, and photovoltaic DC-to-AC converter can keep being incorporated into the power networks; Even certain reactive power is provided to electrical network; Support power system restoration, normal up to power system restoration, thus " passing through " this low-voltage time (zone).The drive coil of side contactor obtains from the side 270V voltage that is incorporated into the power networks because photovoltaic DC-to-AC converter is incorporated into the power networks, and falls if line voltage moment takes place, and contactor line bag can dead electricity, and inverter can off-grid.
The utility model content
The technical problem that the utility model solves is: the utility model makes up a kind of photovoltaic DC-to-AC converter low-voltage and passes through circuit, overcomes the prior art technical problem that point voltage falls that is incorporated into the power networks.
The technical scheme of the utility model is: make up a kind of photovoltaic DC-to-AC converter low-voltage and pass through circuit; Comprise rectifier module D 4, capacitor C 1, diode D2, current-limiting resistance R1; Photovoltaic DC-to-AC converter is incorporated into the power networks and holds J1 to connect said rectifier module D 4; Positive pole after said rectifier module D 4 rectifications is received the anode of photovoltaic DC-to-AC converter contactor coil J2; Connect simultaneously the positive pole of capacitor C 1 through resistance R 1, the C1 positive pole is connected to the forward end of photovoltaic DC-to-AC converter contactor coil, the negative pole after negative sense termination rectifier module D 4 rectifications of contactor coil and the negative pole of capacitor C 1 through diode D2.
The further technical scheme of the utility model is: said rectifier module D 4 is rectifier bridge.
The further technical scheme of the utility model is: said rectifier module D 4 is discrete diode.
The further technical scheme of the utility model is: said capacitor C 1 is by a plurality of electric capacity parallel connections.
The further technical scheme of the utility model is: also comprise contactor J3, said contactor J3 connects the negative pole of capacitor C 1 and the negative pole after rectifier module D 4 rectifications.
The further technical scheme of the utility model is: also comprise electric capacity dilatation interface J4, said electric capacity dilatation interface J4 is parallelly connected with capacitor C 1.
The further technical scheme of the utility model is: also comprise resistance R 5, said resistance R 5 is parallelly connected with capacitor C 1.
The technique effect of the utility model is: make up a kind of photovoltaic DC-to-AC converter low-voltage and pass through circuit; Comprise rectifier module D 4, capacitor C 1, diode D2, current-limiting resistance R1; Photovoltaic DC-to-AC converter is incorporated into the power networks and holds J1 to connect said rectifier module D 4; Positive pole after said rectifier module D 4 rectifications is received the anode of photovoltaic DC-to-AC converter contactor coil J2; Connect simultaneously the positive pole of capacitor C 1 through resistance R 1, the C1 positive pole is connected to the forward end of photovoltaic DC-to-AC converter contactor coil, the negative pole after negative sense termination rectifier module D 4 rectifications of contactor coil and the negative pole of capacitor C 1 through diode D2.When photovoltaic DC-to-AC converter is incorporated into the power networks the 270V voltage of side J1 joint when falling suddenly, give the contactor coil that J2 connect power supply by electrochemical capacitor C1 through diode D2, guarantee that in a period of time coil voltage is not less than minimum operating voltage, realize not off-grid of inverter.A kind of photovoltaic DC-to-AC converter low-voltage of the utility model is passed through circuit, realizes that cost is extremely low, and it is very reliable to work.
Description of drawings
Fig. 1 is the circuit diagram of the utility model.
Embodiment
Below in conjunction with specific embodiment, the utility model technical scheme is further specified.
As shown in Figure 1; The embodiment of the utility model is: make up a kind of photovoltaic DC-to-AC converter low-voltage and pass through circuit; Comprise rectifier module D 4, capacitor C 1, diode D2, current-limiting resistance R1; Photovoltaic DC-to-AC converter is incorporated into the power networks and holds J1 to connect said rectifier module D 4, and the positive pole after said rectifier module D 4 rectifications is received the anode of photovoltaic DC-to-AC converter contactor coil J2, connects the positive pole of capacitor C 1 simultaneously through resistance R 1; The C1 positive pole is connected to the forward end of photovoltaic DC-to-AC converter contactor coil, the negative pole after negative sense termination rectifier module D 4 rectifications of contactor coil and the negative pole of capacitor C 1 through diode D2.R1 is the current-limiting resistance of capacitor C 1 charging, and function is the charging current of limiting capacitance C1, protection capacitor C 1.
As shown in Figure 1; The practical implementation process of the utility model is: the be incorporated into the power networks 270V voltage of side of photovoltaic DC-to-AC converter is given electrochemical capacitor C1 charging through rectifier bridge D4, resistance R 1; When photovoltaic DC-to-AC converter is incorporated into the power networks the 270V voltage of side J1 joint when falling suddenly, give the contactor coil that J2 connect power supply by electrochemical capacitor C1 through diode D2, guarantee in a period of time; Coil voltage is not less than minimum operating voltage, realizes not off-grid of inverter.In the specific embodiment of the utility model, said rectifier module D 4 is a rectifier bridge, and said rectifier module D 4 also can be four diodes of separation.Said capacitor C 1 can be a plurality of electric capacity parallel connections.
As shown in Figure 1, the preferred implementation of the utility model is: said photovoltaic DC-to-AC converter low-voltage is passed through circuit and is also comprised contactor J3, and said contactor J3 connects the negative pole of capacitor C 1 and the negative pole after rectifier module D 4 rectifications.When contactor J3 drives the 270V voltage access at J1 place when enabling, said contactor J3 two terminal shortcircuits, i.e. C1 was recharged when contactor J3 driving enabled; When contactor J3 driving does not enable; J3 breaks off, and promptly the C1 charge circuit breaks off, not consumed energy.
As shown in Figure 1, the preferred implementation of the utility model is: said photovoltaic DC-to-AC converter low-voltage is passed through circuit and is also comprised electric capacity dilatation interface J4, and said electric capacity dilatation interface J4 is parallelly connected with capacitor C 1.Said photovoltaic DC-to-AC converter low-voltage is passed through circuit and is also comprised resistance R 5, and said resistance R 5 is parallelly connected with capacitor C 1.R5 is the discharge resistance of capacitor C 1, and the residual voltage of closing on the capacitor C 1 of back at inverter also is dangerous electric capacity, need release through resistance R 5, guarantees safety.
A kind of photovoltaic DC-to-AC converter low-voltage of the utility model is passed through circuit; Comprise rectifier module D 4, capacitor C 1, diode D2; Photovoltaic DC-to-AC converter is incorporated into the power networks and holds J1 to connect rectifier module D 4; Positive pole after said rectifier module D 4 rectifications is received the anode of photovoltaic DC-to-AC converter contactor coil J2, connects the positive pole of capacitor C 1 simultaneously through resistance R 1.The C1 positive pole is connected to the forward end of photovoltaic DC-to-AC converter contactor coil through diode D2, and the negative end of contactor coil is connected to the negative pole after rectifier module D 4 rectifications.。When photovoltaic DC-to-AC converter is incorporated into the power networks the 270V voltage of side J1 joint when falling suddenly, give the contactor coil that J2 connect power supply by electrochemical capacitor C1 through diode D2, guarantee that in a period of time coil voltage is not less than minimum operating voltage, realize not off-grid of inverter.A kind of photovoltaic DC-to-AC converter low-voltage of the utility model is passed through circuit, realizes that cost is extremely low, and it is very reliable to work.
Above content is the further explain that combines concrete preferred implementation that the utility model is done, and can not assert that the practical implementation of the utility model is confined to these explanations.For the those of ordinary skill of technical field under the utility model, under the prerequisite that does not break away from the utility model design, can also make some simple deduction or replace, all should be regarded as belonging to the protection range of the utility model.
Claims (7)
1. a photovoltaic DC-to-AC converter low-voltage is passed through circuit; It is characterized in that; Comprise rectifier module D 4, capacitor C 1, diode D2, current-limiting resistance R1; Photovoltaic DC-to-AC converter is incorporated into the power networks and holds J1 to connect said rectifier module D 4, and the positive pole after said rectifier module D 4 rectifications is received the anode of photovoltaic DC-to-AC converter contactor coil J2, connects the positive pole of capacitor C 1 simultaneously through resistance R 1; The C1 positive pole is connected to the forward end of photovoltaic DC-to-AC converter contactor coil, the negative pole after negative sense termination rectifier module D 4 rectifications of contactor coil and the negative pole of capacitor C 1 through diode D2.
2. pass through circuit according to the said photovoltaic DC-to-AC converter low-voltage of claim 1, it is characterized in that, said rectifier module D 4 is a rectifier bridge.
3. pass through circuit according to the said photovoltaic DC-to-AC converter low-voltage of claim 1, it is characterized in that, said rectifier module D 4 is discrete diode.
4. pass through circuit according to the said photovoltaic DC-to-AC converter low-voltage of claim 1, it is characterized in that, said capacitor C 1 is by a plurality of electric capacity parallel connections.
5. pass through circuit according to the said photovoltaic DC-to-AC converter low-voltage of claim 1, it is characterized in that, also comprise contactor J3, said contactor J3 connects the negative pole of capacitor C 1 and the negative pole after rectifier module D 4 rectifications.
6. pass through circuit according to the said photovoltaic DC-to-AC converter low-voltage of claim 1, it is characterized in that, also comprise electric capacity dilatation interface J4, said electric capacity dilatation interface J4 is parallelly connected with capacitor C 1.
7. pass through circuit according to the said photovoltaic DC-to-AC converter low-voltage of claim 1, it is characterized in that, also comprise resistance R 5, said resistance R 5 is parallelly connected with capacitor C 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204772614U CN202353234U (en) | 2011-11-26 | 2011-11-26 | Low-voltage ride through circuit of photovoltaic inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204772614U CN202353234U (en) | 2011-11-26 | 2011-11-26 | Low-voltage ride through circuit of photovoltaic inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202353234U true CN202353234U (en) | 2012-07-25 |
Family
ID=46542198
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204772614U Expired - Lifetime CN202353234U (en) | 2011-11-26 | 2011-11-26 | Low-voltage ride through circuit of photovoltaic inverter |
Country Status (1)
| Country | Link |
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| CN (1) | CN202353234U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103138383A (en) * | 2013-02-27 | 2013-06-05 | 深圳航天科技创新研究院 | Photovoltaic (pv) grid-connected inverter low-voltage ride-through auxiliary power supply device and method |
| CN104104217A (en) * | 2014-07-08 | 2014-10-15 | 安徽金峰新能源股份有限公司 | Power energy storage module for under-voltage protection of 500kW and 630kW photovoltaic inverter |
-
2011
- 2011-11-26 CN CN2011204772614U patent/CN202353234U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103138383A (en) * | 2013-02-27 | 2013-06-05 | 深圳航天科技创新研究院 | Photovoltaic (pv) grid-connected inverter low-voltage ride-through auxiliary power supply device and method |
| CN104104217A (en) * | 2014-07-08 | 2014-10-15 | 安徽金峰新能源股份有限公司 | Power energy storage module for under-voltage protection of 500kW and 630kW photovoltaic inverter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120725 |