CN203826988U - Photovoltaic inverter for power storage-type photovoltaic grid-connected system - Google Patents
Photovoltaic inverter for power storage-type photovoltaic grid-connected system Download PDFInfo
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- CN203826988U CN203826988U CN201420205932.5U CN201420205932U CN203826988U CN 203826988 U CN203826988 U CN 203826988U CN 201420205932 U CN201420205932 U CN 201420205932U CN 203826988 U CN203826988 U CN 203826988U
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- diode
- parallel
- photovoltaic
- operational amplifier
- control unit
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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 inverter for a power storage-type photovoltaic grid-connected system. A current acquisition module is disposed on the photovoltaic inverter. The current acquisition module comprises a photosensitive triode (Q1). The collector of the photosensitive triode (Q1) is connected to a power supply (Vcc), the emitter of the photosensitive triode (Q1) is connected through a second resistor (R2) to the positive power supply end of an operational amplifier (IC), and an opposite position to the base of the photosensitive triode (Q1) is provided with a third diode (D3) and a fourth diode (D4) which are connected in parallel with each other. One side of the parallel circuit of the third diode (D3) and the fourth diode (D4) is connected to a live line of an electric supply (AC) through a first resistor (R1), and the other side is grounded or connected to a zero line of the electric supply (AC). The negative power supply end of the operational amplifier (IC) is grounded, and an input end of the operational amplifier (IC) is connected to an output end of a current transformer (2).
Description
Technical field
The utility model relates to a kind of photovoltaic DC-to-AC converter for accumulation energy type photovoltaic parallel in system, belongs to solar energy generation technology field.
Background technology
Even cancel grid-connected subsidy along with starting with the countries in Europe headed by Germany to cut down, energy storage combining inverter becomes the focus that the whole world is paid close attention to gradually.Energy storage inverter utilizes solar energy to supply with household electricity daytime, and can, by unnecessary electrical power storage to storage battery, in the time of battery quota, can automatically input electrical network.In crest electricity price, evening or sunshine, family all can be used the electric energy storing in battery, and can flow at high price electrical network, earns more high yield when deficiency; In the time of trough electricity price, charge the battery by electrical network, save family's expenditure.But existing energy storage inverter is all realized mains supply, storage battery power supply and three kinds of load supplying patterns of photovoltaic power supply according to the switching at night on daytime.The complementary power supply of electrical network and photovoltaic if necessary, needs inverter can grasp the size cases of load and the phase place of electrical network changes, thereby realizes synchronous compensation.
Utility model content
The purpose of this utility model is, a kind of photovoltaic DC-to-AC converter for accumulation energy type photovoltaic parallel in system is provided.It can make the phase place of inverter energy Real-time Collection electrical network and the size variation situation of load.
The technical solution of the utility model: for the photovoltaic DC-to-AC converter of accumulation energy type photovoltaic parallel in system, be characterized in: described photovoltaic DC-to-AC converter is provided with current acquisition module, described current acquisition module comprises photosensitive triode, the collector electrode of photosensitive triode is connected with power supply, the emitter of photosensitive triode is connected with the positive power source terminal of operational amplifier by the second resistance, the base stage opposite position of described photosensitive triode is provided with the 3rd diode parallel with one another and the 4th diode, parallel circuits one side of the 3rd diode and the 4th diode is connected with the live wire of civil power by the first resistance, the zero line of opposite side ground connection or connection civil power, the negative power end ground connection of described operational amplifier, the input of described operational amplifier is connected with the output of current transformer, between two binding posts of current transformer output, be also provided with the first electric capacity, on the first electric capacity, be parallel with the first diode and the second diode, the parallel with one another and opposite direction of the first diode and the second diode, the positive pole of the input of described operational amplifier is connected with the output of operational amplifier by the 3rd resistance.
The above-mentioned photovoltaic DC-to-AC converter for accumulation energy type photovoltaic parallel in system, is parallel with a regulating circuit on described the 3rd resistance, and regulating circuit comprises the second electric capacity and the regulating resistance that are cascaded.
The aforesaid photovoltaic DC-to-AC converter for accumulation energy type photovoltaic parallel in system, comprise the MPPT unit that connects solar panel, MPPT unit is connected with inversion control unit, inversion control unit is also connected with Master Control Unit with inversion unit, and Master Control Unit is connected with storage battery by accumulator cell charging and discharging control unit, accumulator cell charging and discharging unit successively; Described Master Control Unit is connected with utility grid output by current acquisition module.
Compared with prior art, the utility model according to civil power alternating current when the powering load, transient current can periodically change, and electric current is very low near some phase place, easily there is the problem of larger error at the Data processing in later stage, utilize light-emitting diode that line voltage is changed and is converted into flash signal, and utilize phototriode light signal collection to be converted into the pulse electrical signal of the switching regulator of amplification, recycling pulse electrical signal carries out switch control to operational amplifier, make mains current signal that current transformer collects hour cannot carry out signal amplification at electric current, therefore the pulse voltage signal of the utility model operational amplifier output ground voltage signal to be a filtering easily the occur small-signal of error.And the utility model utilized photosensitive triode to transform ac signal, with respect to the acquisition mode of voltage transformer, can reduce phase delay, improve precision.
Brief description of the drawings
Fig. 1 is current acquisition modular structure schematic diagram of the present utility model;
Fig. 2 is structural representation of the present utility model.
Embodiment
Below in conjunction with drawings and Examples, the utility model is further described, but not as the foundation to the utility model restriction.
Embodiment.For the photovoltaic DC-to-AC converter of accumulation energy type photovoltaic parallel in system, as shown in Figure 1: described photovoltaic DC-to-AC converter is provided with current acquisition module, described current acquisition module comprises photosensitive triode Q1, the collector electrode of photosensitive triode Q1 is connected with power Vcc, the emitter of photosensitive triode Q1 is connected with the positive power source terminal of operational amplifier IC by the second resistance R 2, the base stage opposite position of described photosensitive triode Q1 is provided with the 3rd diode D3 parallel with one another and the 4th diode D4, parallel circuits one side of the 3rd diode D3 and the 4th diode D4 is connected with the live wire of civil power AC by the first resistance R 1, the zero line of opposite side ground connection or connection civil power AC, the negative power end ground connection of operational amplifier IC, is connected with power Vcc on the collector electrode of switch triode Q1, the input of described operational amplifier IC is connected with the output of current transformer 2, between two binding posts of current transformer 2 outputs, be also provided with the first capacitor C 1, in the first capacitor C 1 signal of filtering high frequency (can), be parallel with the first diode D1 and the second diode D2, parallel with one another and the opposite direction of the first diode D1 and the second diode D2, these two diodes play a protective role: one of them can prevent the voltage breakdown that another diode is reversed, the positive pole of the input of described operational amplifier IC is connected with the output of operational amplifier IC by the 3rd resistance R 3.In described the 3rd resistance R 3, be parallel with a regulating circuit, regulating circuit comprises the second capacitor C 2 and the regulating resistance r that are cascaded.Described energy storage combining inverter also comprises the MPPT unit 4 that connects solar panel 3, MPPT unit 4 is connected with inversion control unit 5, inversion control unit 5 is also connected with Master Control Unit 7 with inversion unit 6, and Master Control Unit 7 is connected with storage battery 10 by accumulator cell charging and discharging control unit 8, accumulator cell charging and discharging unit 9 successively; Described Master Control Unit 7 is connected with utility grid output by current acquisition module.
According to civil power alternating current when the powering load, transient current can periodically change, and electric current is very low near some phase place, easily there is the problem of larger error at the Data processing in later stage, the utility model according to civil power alternating current when the powering load, transient current can periodically change, and electric current is very low near some phase place, easily there is the problem of larger error at the Data processing in later stage, utilize light-emitting diode that line voltage is changed and is converted into flash signal, and utilize phototriode light signal collection to be converted into the pulse electrical signal of the switching regulator of amplification, recycling pulse electrical signal carries out switch control to operational amplifier, make mains current signal that current transformer collects hour cannot carry out signal amplification at electric current, therefore the pulse voltage signal of the utility model operational amplifier output ground voltage signal to be a filtering easily the occur small-signal of error.And the utility model utilized photosensitive triode to transform ac signal, with respect to the acquisition mode of voltage transformer, can reduce phase delay, improve precision.Subsequently, utilize pulse voltage signal, can obtain phase information and the load situation of civil power by simple data processing (completing) simultaneously in Master Control Unit.
Assemble the photovoltaic grid-connected inverting system of inverter of the present utility model, can realize following mode of operation: in the time that electric current flows into electrical network, preferential increasing reduced to the charging of energy-storage battery the electricity that flows into electrical network, if still have unnecessary electric weight, unnecessary electric weight is supplied to national grid generating, and can be synchronously grid-connected according to the phase place situation realization gathering, can not cause impacting with high pressure to electrical network like this; In the time that electric current flows into load by electrical network, reduce charging current or increase discharging current and carry out supply power supply, when supply, too according to the synchronous supply of phase place situation, can not cause impacting with high pressure to load like this, if still not enough, add the electricity of national grid to use to load.
Claims (3)
1. for the photovoltaic DC-to-AC converter of accumulation energy type photovoltaic parallel in system, it is characterized in that: described photovoltaic DC-to-AC converter is provided with current acquisition module, described current acquisition module comprises photosensitive triode (Q1), the collector electrode of photosensitive triode (Q1) is connected with power supply (Vcc), the emitter of photosensitive triode (Q1) is connected with the positive power source terminal of operational amplifier (IC) by the second resistance (R2), the base stage opposite position of described photosensitive triode (Q1) is provided with the 3rd diode (D3) parallel with one another and the 4th diode (D4), parallel circuits one side of the 3rd diode (D3) and the 4th diode (D4) is connected with the live wire of civil power (AC) by the first resistance (R1), the zero line of opposite side ground connection or connection civil power (AC), the negative power end ground connection of described operational amplifier (IC), the input of described operational amplifier (IC) is connected with the output of current transformer (2), between two binding posts of current transformer (2) output, be also provided with the first electric capacity (C1), on the first electric capacity (C1), be parallel with the first diode (D1) and the second diode (D2), the parallel with one another and opposite direction of the first diode (D1) and the second diode (D2), the positive pole of the input of described operational amplifier (IC) is connected with the output of operational amplifier (IC) by the 3rd resistance (R3).
2. the photovoltaic DC-to-AC converter for accumulation energy type photovoltaic parallel in system according to claim 1, it is characterized in that: on described the 3rd resistance (R3), be parallel with a regulating circuit, regulating circuit comprises the second electric capacity (C2) and the regulating resistance (r) that are cascaded.
3. the photovoltaic DC-to-AC converter for accumulation energy type photovoltaic parallel in system according to claim 2, it is characterized in that: comprise the MPPT unit (4) that connects solar panel (3), MPPT unit (4) is connected with inversion control unit (5), inversion control unit (5) is also connected with Master Control Unit (7) with inversion unit (6), and Master Control Unit (7) is connected with storage battery (10) by accumulator cell charging and discharging control unit (8), accumulator cell charging and discharging unit (9) successively; Described Master Control Unit (7) is connected with utility grid output by current acquisition module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420205932.5U CN203826988U (en) | 2014-04-25 | 2014-04-25 | Photovoltaic inverter for power storage-type photovoltaic grid-connected system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420205932.5U CN203826988U (en) | 2014-04-25 | 2014-04-25 | Photovoltaic inverter for power storage-type photovoltaic grid-connected system |
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| Publication Number | Publication Date |
|---|---|
| CN203826988U true CN203826988U (en) | 2014-09-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420205932.5U Expired - Lifetime CN203826988U (en) | 2014-04-25 | 2014-04-25 | Photovoltaic inverter for power storage-type photovoltaic grid-connected system |
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| CN (1) | CN203826988U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119738648A (en) * | 2025-03-05 | 2025-04-01 | 南京瑞泓晟电力科技有限公司 | Power supply line power outage detection method and system |
-
2014
- 2014-04-25 CN CN201420205932.5U patent/CN203826988U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119738648A (en) * | 2025-03-05 | 2025-04-01 | 南京瑞泓晟电力科技有限公司 | Power supply line power outage detection method and system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: Tonglu County, Hangzhou Economic Development Zone, Zhejiang province 311500 City Chu Road No. 288 Patentee after: ZHEJIANG SOLAX NETWORK ENERGY TECHNOLOGY CO.,LTD. Address before: Tonglu County, Hangzhou Economic Development Zone, Zhejiang province 311500 City Chu Road No. 288 Patentee before: SOLAX POWER Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 311500 No. 288 Shizhu Road, Tonglu County Economic Development Zone, Hangzhou City, Zhejiang Province Patentee after: Zhejiang arrow network energy technology Co.,Ltd. Address before: 311500 No. 288 Shizhu Road, Tonglu County Economic Development Zone, Hangzhou City, Zhejiang Province Patentee before: ZHEJIANG SOLAX NETWORK ENERGY TECHNOLOGY Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140910 |
|
| CX01 | Expiry of patent term |