CN209948693U - Photovoltaic off-grid and grid-connected integrated inverter - Google Patents
Photovoltaic off-grid and grid-connected integrated inverter Download PDFInfo
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- CN209948693U CN209948693U CN201921205244.8U CN201921205244U CN209948693U CN 209948693 U CN209948693 U CN 209948693U CN 201921205244 U CN201921205244 U CN 201921205244U CN 209948693 U CN209948693 U CN 209948693U
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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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- 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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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Abstract
The utility model discloses a photovoltaic is from integration dc-to-ac converter that is incorporated into power networks, its characterized in that: comprises a main circuit and a control circuit; the main circuit comprises a front-stage circuit and a rear-stage circuit, wherein the front-stage circuit comprises a push-pull boosting circuit connected with the photovoltaic module and a BUCK-Boost boosting circuit connected with the energy storage battery; the post-stage circuit comprises an inverter output circuit, and the inverter output circuit is respectively connected with a load and a power grid; the control circuit comprises a voltage detection circuit, a current detection circuit and a driving control chip. The utility model discloses the novelty will be incorporated into the power networks the dc-to-ac converter with from the grid-connected inverter combination, realize the photovoltaic from the integration of being incorporated into the power networks, can satisfy the demand of being incorporated into the power networks electricity generation and from the grid-connected electricity generation, can solve the inverter that is incorporated into the power networks again and from the respective not enough of grid-connected inverter.
Description
Technical Field
The utility model relates to a green energy equipment, especially a photovoltaic is from integration dc-to-ac converter that is incorporated into the power networks.
Background
The photovoltaic is the main power of a new energy supply line, the inverter is an important link of new energy power generation, and the photovoltaic inverter is a key device for supplying electric energy by taking the photovoltaic as the new energy; the photovoltaic inverter has the characteristics of simple installation mode, convenient energy acquisition and the like, is bright in the new energy market, and promotes the market explosion of the photovoltaic inverter. Photovoltaic inverters include off-grid inverters and grid-connected inverters, and currently, grid-connected inverters are mainly used, but the grid-connected inverters have some problems in use: when the power grid is powered off, the photovoltaic power station is disconnected from the power grid and shut down due to island protection, the photovoltaic power station can be put into the power grid again only after the power grid recovers normal power supply, and during the power failure, the electric energy generated by the solar cell panel is not utilized, so that waste is caused; and the off-grid inverter is influenced by weather, so that the power supply is unstable, and the service life of the load is influenced.
SUMMERY OF THE UTILITY MODEL
The invention of the utility model aims to: aiming at the existing problems, the photovoltaic grid-off and grid-connected integrated inverter is provided, a grid-connected inverter and an off-grid inverter are combined, grid-connected power generation is carried out under the normal power supply of a power grid, when no power supply output exists at the power grid side, off-grid power generation is switched to supply power to a load, and the defect that the grid-connected inverter and the off-grid inverter are used independently is effectively overcome.
The utility model adopts the technical scheme as follows:
the utility model relates to a photovoltaic is from grid-connected integration inverter, including main circuit and control circuit; the main circuit comprises a front-stage circuit and a rear-stage circuit, wherein the front-stage circuit comprises a push-pull boosting circuit connected with the photovoltaic module and a BUCK-Boost boosting circuit connected with the energy storage battery; the post-stage circuit comprises an inverter output circuit, and the inverter output circuit is respectively connected with a load and a power grid; the control circuit comprises a voltage detection circuit, a current detection circuit and a driving control chip.
Further, the push-pull boost circuit comprises an inductor L1, a switching tube S1, a diode D1 and capacitors C1 and C0; one end of the inductor L1 is respectively connected with the collector of the switch tube S1 and the anode of the diode D1; the cathode of the diode D1 is connected to one end of the capacitor C1, the other end of the capacitor C1 is connected to the emitter of the switch tube S1, and the two ends of the capacitor C0 are connected to the other end of the inductor L1 and the emitter of the switch tube S1 respectively.
Further, the BUCK-Boost voltage boosting circuit comprises a capacitor C2, an inductor L2, a switching tube S2, a switching tube S3 and a capacitor C3; one end of the capacitor C2 is connected with one end of an inductor L2, the other end of the capacitor C2 is connected with an emitter of a switch tube S3, the other end of the inductor L2 is respectively connected with an emitter of a switch tube S2 and a collector of a switch tube S3, the capacitor C3 is connected between the collector of the switch tube S2 and the emitter of the switch tube S3 in series, a diode D2 is arranged between the collector and the emitter of the switch tube S2, and a diode D3 is arranged between the collector and the emitter of the switch tube S3.
Further, the inverter output circuit comprises switching tubes S4, S5, S6 and S7; the switch tube is connected with a diode in parallel, the emitter of the switch tube S4 is connected with the collector of the switch tube S6, the emitter of the switch tube S6 is connected with the emitter of the switch tube S7, the collector of the switch tube S7 is connected with the emitter of the switch tube S5, and the collector of the switch tube S5 is connected with the collector of the switch tube S4; the emitter of the switch tube S4 is further connected to one end of an inductor L3, the other end of the inductor L3 is connected to one end of a capacitor C4, and the other end of the capacitor C4 is connected to the emitter of the switch tube S5.
Further, the voltage detection circuit includes a transformer T1, an amplifier Q1, and an amplifier Q2; a resistor R1 and a resistor R2 are connected in series with the primary side of the transformer T1, one end of the secondary side of the transformer T1 is connected with the forward input end of an amplifier Q1, a capacitor C5 and a resistor R3 are connected between the reverse input end and the output end of the amplifier Q1 respectively, the output end of the amplifier Q1 is connected with a resistor R4 in series, a resistor R4 is connected with the forward input end of an amplifier Q2, the reverse input end of the amplifier Q2 is connected with the output end, the output end of the amplifier Q2 is connected with one end of a resistor R5, the other end of the resistor R5 is connected with one end of a resistor R6, the anode of a diode D4 and the cathode of a diode D5 respectively, the cathode of a diode D4 is connected.
Further, the current detection circuit comprises an operational amplifier comprising an amplifier Q3 and an amplifier Q4; the positive input end of the amplifier Q3 is connected with the resistor R7, the reverse input end is connected with the output end, the output end is connected with one end of the resistor R8, the other end of the resistor R8 is connected with the resistor R9, the resistor R9 is respectively connected with the capacitor and the positive input end of the amplifier Q4, the reverse input end of the amplifier Q4 is connected with the output end, the output end is connected with one end of the resistor R10, the other end of the resistor R10 is respectively connected with one end of the resistor R11, the anode of the diode D6 and the cathode of the diode D7, the cathode of the diode D6 is connected with the other end of the resistor R.
To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that: compared with the prior art, the utility model discloses, the novelty combines grid-connected inverter and off-grid inverter, realizes that the photovoltaic is from grid-connected integration, can satisfy grid-connected electricity generation and off-grid electricity generation's demand, can solve grid-connected inverter and off-grid inverter respectively not enough again; meanwhile, in a front-stage circuit, the voltage generated by the photovoltaic module is boosted to the voltage required by the direct-current bus through the push-pull boosting circuit, and the energy storage battery is connected to the direct-current bus through the BUCK-Boost boosting circuit to charge or discharge the energy storage battery; the direct current bus is directly connected to the grid or independently inverted to supply power to a load through an inversion output circuit; and a detection and control circuit is designed, and the switching between the grid-connected mode and the off-grid mode is realized by judging whether the grid-connected mode or the off-grid mode is entered through detecting voltage and current.
Drawings
Fig. 1 is a circuit diagram of the photovoltaic grid-off and grid-connected integrated inverter of the present invention.
Fig. 2 is a voltage detection circuit diagram.
Fig. 3 is a current detection circuit diagram.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
As shown in fig. 1, the utility model relates to a photovoltaic is from grid-connected integration inverter, including main circuit and control circuit; the main circuit comprises a front-stage circuit and a rear-stage circuit, wherein the front-stage circuit comprises a push-pull boosting circuit connected with the photovoltaic module and a BUCK-Boost boosting circuit connected with the energy storage battery; the post-stage circuit comprises an inverter output circuit, and the inverter output circuit is respectively connected with a load and a power grid; the control circuit comprises a voltage detection circuit, a current detection circuit and a driving control chip; the voltage detection circuit and the current detection circuit respectively detect the voltage and the current in the branch bus and send detected voltage and current signals to the driving control chip, the driving control chip outputs corresponding control signals according to preset control, the control signals are sent to corresponding switch tubes, the switch tubes are controlled to be opened and closed, and switching between grid connection and grid disconnection is achieved; the driving control chip is ATmega 8.
In an embodiment, the push-pull boost circuit comprises an inductor L1, a switching tube S1, a diode D1 and capacitors C1, C0; one end of the inductor L1 is respectively connected with the collector of the switch tube S1 and the anode of the diode D1; the cathode of the diode D1 is connected to one end of the capacitor C1, the other end of the capacitor C1 is connected to the emitter of the switch tube S1, and the two ends of the capacitor C0 are connected to the other end of the inductor L1 and the emitter of the switch tube S1 respectively.
In an embodiment, the BUCK-Boost voltage boosting circuit includes a capacitor C2, an inductor L2, a switching tube S2, a switching tube S3, and a capacitor C3; one end of the capacitor C2 is connected with one end of an inductor L2, the other end of the capacitor C2 is connected with an emitter of a switch tube S3, the other end of the inductor L2 is respectively connected with an emitter of a switch tube S2 and a collector of a switch tube S3, the capacitor C3 is connected between the collector of the switch tube S2 and the emitter of the switch tube S3 in series, a diode D2 is arranged between the collector and the emitter of the switch tube S2, and a diode D3 is arranged between the collector and the emitter of the switch tube S3.
In an embodiment, the inverter output circuit includes switching tubes S4, S5, S6, S7; the switch tube is connected with a diode in parallel, the emitter of the switch tube S4 is connected with the collector of the switch tube S6, the emitter of the switch tube S6 is connected with the emitter of the switch tube S7, the collector of the switch tube S7 is connected with the emitter of the switch tube S5, and the collector of the switch tube S5 is connected with the collector of the switch tube S4; the emitter of the switch tube S4 is further connected to one end of an inductor L3, the other end of the inductor L3 is connected to one end of a capacitor C4, and the other end of the capacitor C4 is connected to the emitter of the switch tube S5.
As shown in fig. 2, the voltage detection circuit includes a transformer T1, an amplifier Q1, and an amplifier Q2; a resistor R1 and a resistor R2 are connected in series with the primary side of the transformer T1, one end of the secondary side of the transformer T1 is connected with the forward input end of an amplifier Q1, a capacitor C5 and a resistor R3 are connected between the reverse input end and the output end of the amplifier Q1 respectively, the output end of the amplifier Q1 is connected with a resistor R4 in series, a resistor R4 is connected with the forward input end of an amplifier Q2, the reverse input end of the amplifier Q2 is connected with the output end, the output end of the amplifier Q2 is connected with one end of a resistor R5, the other end of the resistor R5 is connected with one end of a resistor R6, the anode of a diode D4 and the cathode of a diode D5 respectively, the cathode of a diode D4 is connected.
As shown in fig. 3, the current detection circuit includes an operational amplifier including an amplifier Q3 and an amplifier Q4; the positive input end of the amplifier Q3 is connected with the resistor R7, the reverse input end is connected with the output end, the output end is connected with one end of the resistor R8, the other end of the resistor R8 is connected with the resistor R9, the resistor R9 is respectively connected with the capacitor and the positive input end of the amplifier Q4, the reverse input end of the amplifier Q4 is connected with the output end, the output end is connected with one end of the resistor R10, the other end of the resistor R10 is respectively connected with one end of the resistor R11, the anode of the diode D6 and the cathode of the diode D7, the cathode of the diode D6 is connected with the other end of the resistor R.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (6)
1. The utility model provides a photovoltaic is from integration inverter that is incorporated into power networks which characterized in that: comprises a main circuit and a control circuit; the main circuit comprises a front-stage circuit and a rear-stage circuit, wherein the front-stage circuit comprises a push-pull boosting circuit connected with the photovoltaic module and a BUCK-Boost boosting circuit connected with the energy storage battery; the post-stage circuit comprises an inverter output circuit, and the inverter output circuit is respectively connected with a load and a power grid; the control circuit comprises a voltage detection circuit, a current detection circuit and a driving control chip.
2. The grid-disconnected and grid-connected integrated photovoltaic inverter according to claim 1, characterized in that: the push-pull boosting circuit comprises an inductor L1, a switching tube S1, a diode D1 and capacitors C1 and C0; one end of the inductor L1 is respectively connected with the collector of the switch tube S1 and the anode of the diode D1; the cathode of the diode D1 is connected to one end of the capacitor C1, the other end of the capacitor C1 is connected to the emitter of the switch tube S1, and the two ends of the capacitor C0 are connected to the other end of the inductor L1 and the emitter of the switch tube S1 respectively.
3. The grid-disconnected and grid-connected integrated photovoltaic inverter according to claim 1, characterized in that: the BUCK-Boost voltage boosting circuit comprises a capacitor C2, an inductor L2, a switching tube S2, a switching tube S3 and a capacitor C3; one end of the capacitor C2 is connected with one end of an inductor L2, the other end of the capacitor C2 is connected with an emitter of a switch tube S3, the other end of the inductor L2 is respectively connected with an emitter of a switch tube S2 and a collector of a switch tube S3, the capacitor C3 is connected between the collector of the switch tube S2 and the emitter of the switch tube S3 in series, a diode D2 is arranged between the collector and the emitter of the switch tube S2, and a diode D3 is arranged between the collector and the emitter of the switch tube S3.
4. The grid-disconnected and grid-connected integrated photovoltaic inverter according to claim 1, characterized in that: the inverter output circuit comprises switching tubes S4, S5, S6 and S7; the switch tube is connected with a diode in parallel, the emitter of the switch tube S4 is connected with the collector of the switch tube S6, the emitter of the switch tube S6 is connected with the emitter of the switch tube S7, the collector of the switch tube S7 is connected with the emitter of the switch tube S5, and the collector of the switch tube S5 is connected with the collector of the switch tube S4; the emitter of the switch tube S4 is further connected to one end of an inductor L3, the other end of the inductor L3 is connected to one end of a capacitor C4, and the other end of the capacitor C4 is connected to the emitter of the switch tube S5.
5. The grid-disconnected and grid-connected integrated photovoltaic inverter according to claim 1, characterized in that: the voltage detection circuit comprises a transformer T1, an amplifier Q1 and an amplifier Q2; a resistor R1 and a resistor R2 are connected in series with the primary side of the transformer T1, one end of the secondary side of the transformer T1 is connected with the forward input end of an amplifier Q1, a capacitor C5 and a resistor R3 are connected between the reverse input end and the output end of the amplifier Q1 respectively, the output end of the amplifier Q1 is connected with a resistor R4 in series, a resistor R4 is connected with the forward input end of an amplifier Q2, the reverse input end of the amplifier Q2 is connected with the output end, the output end of the amplifier Q2 is connected with one end of a resistor R5, the other end of the resistor R5 is connected with one end of a resistor R6, the anode of a diode D4 and the cathode of a diode D5 respectively, the cathode of a diode D4 is connected.
6. The grid-disconnected and grid-connected integrated photovoltaic inverter according to claim 1, characterized in that: the current detection circuit comprises an operational amplifier comprising an amplifier Q3 and an amplifier Q4; the positive input end of the amplifier Q3 is connected with the resistor R7, the reverse input end is connected with the output end, the output end is connected with one end of the resistor R8, the other end of the resistor R8 is connected with the resistor R9, the resistor R9 is respectively connected with the capacitor and the positive input end of the amplifier Q4, the reverse input end of the amplifier Q4 is connected with the output end, the output end is connected with one end of the resistor R10, the other end of the resistor R10 is respectively connected with one end of the resistor R11, the anode of the diode D6 and the cathode of the diode D7, the cathode of the diode D6 is connected with the other end of the resistor R.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921205244.8U CN209948693U (en) | 2019-07-29 | 2019-07-29 | Photovoltaic off-grid and grid-connected integrated inverter |
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| CN201921205244.8U CN209948693U (en) | 2019-07-29 | 2019-07-29 | Photovoltaic off-grid and grid-connected integrated inverter |
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| CN209948693U true CN209948693U (en) | 2020-01-14 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111614255A (en) * | 2020-04-29 | 2020-09-01 | 南宁学院 | Portable voltage converter |
| CN116799863A (en) * | 2023-08-28 | 2023-09-22 | 中天宽带技术有限公司 | Off-grid photovoltaic inverter |
| CN117713198A (en) * | 2023-12-08 | 2024-03-15 | 广州云酷智能设备有限公司 | Grid-connected inverter control core module and photovoltaic power conversion cabinet |
| CN117713198B (en) * | 2023-12-08 | 2024-05-24 | 广州云酷智能设备有限公司 | Grid-connected inverter control core module and photovoltaic power conversion cabinet |
-
2019
- 2019-07-29 CN CN201921205244.8U patent/CN209948693U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111614255A (en) * | 2020-04-29 | 2020-09-01 | 南宁学院 | Portable voltage converter |
| CN116799863A (en) * | 2023-08-28 | 2023-09-22 | 中天宽带技术有限公司 | Off-grid photovoltaic inverter |
| CN116799863B (en) * | 2023-08-28 | 2024-05-10 | 中天宽带技术有限公司 | Off-grid photovoltaic inverter |
| CN117713198A (en) * | 2023-12-08 | 2024-03-15 | 广州云酷智能设备有限公司 | Grid-connected inverter control core module and photovoltaic power conversion cabinet |
| CN117713198B (en) * | 2023-12-08 | 2024-05-24 | 广州云酷智能设备有限公司 | Grid-connected inverter control core module and photovoltaic power conversion cabinet |
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