CN209402170U - A kind of photovoltaic power generation grid-connecting system - Google Patents
A kind of photovoltaic power generation grid-connecting system Download PDFInfo
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- CN209402170U CN209402170U CN201920176859.6U CN201920176859U CN209402170U CN 209402170 U CN209402170 U CN 209402170U CN 201920176859 U CN201920176859 U CN 201920176859U CN 209402170 U CN209402170 U CN 209402170U
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Abstract
The utility model discloses a kind of photovoltaic power generation grid-connecting systems, it is related to field of photovoltaic power generation, including photo-voltaic power supply, power resistor, inverter circuit, transformer, signal generator, zero-crossing comparator, core processor and SPWM driving circuit, the output end of photo-voltaic power supply, power resistor, the first input end of inverter circuit is sequentially connected in series, the output end of inverter circuit and the input terminal of transformer connect, the output end of transformer is connect with network system, signal generator generates sine wave signal, the output end of signal generator, zero-crossing comparator, the first input end of core processor is sequentially connected in series, first output end of core processor is connect with the input terminal of SPWM driving circuit, the output end of SPWM driving circuit and the second input terminal of inverter circuit connect.The photovoltaic power generation grid-connecting system inversion efficiency of the utility model is high, stability of grid connection is good.
Description
Technical field
The utility model relates to field of photovoltaic power generation more particularly to a kind of photovoltaic power generation grid-connecting systems.
Background technique
The sun has contained huge energy, and solar energy is inexhaustible, inexhaustible, and will not generate pollution, conduct
A kind of renewable energy is more and more extensive to be developed by people, the photovoltaic generating system also attention more by various countries.It is expected that
To 2030, global Photovoltaic generation installed capacity was up to 300GW, until 2040, it is total that photovoltaic power generation is up to whole world power generation
The 15%-20% of amount.Photovoltaic power generation is that solar energy is turned into the direct current utilized for people, the sun by solar panel
The direct current that can be issued is wanted to be applied on a large scale, it is necessary to be alternating current for the DC inverter and realize simultaneously with national grid
Net, to supply the electricity units such as resident, business, industry, agricultural.However there are inversion efficiencies for existing photovoltaic power generation grid-connecting apparatus
Low, the problems such as stability of grid connection is poor.
Utility model content
The utility model aim is exactly to provide a kind of photovoltaic power generation grid-connecting system to make up defect of the existing technology
System, solves the problems, such as low, stability of grid connection difference of inversion efficiency existing for existing photovoltaic power generation grid-connecting apparatus etc..
Technical solutions of the utility model are as follows: a kind of photovoltaic power generation grid-connecting system, it is characterised in that: including photo-voltaic power supply,
Power resistor, inverter circuit, transformer, signal generator, zero-crossing comparator, core processor and SPWM driving circuit, it is described
The output end of photo-voltaic power supply, power resistor, the inverter circuit first input end be sequentially connected in series, the output of the inverter circuit
End is connect with the input terminal of the transformer, and the output end of the transformer is connect with network system, and the signal generator produces
Raw sine wave signal, the output end of the signal generator, the zero-crossing comparator, the core processor first input end
It is sequentially connected in series, the first output end of the core processor is connect with the input terminal of the SPWM driving circuit, and the SPWM drives
The output end of dynamic circuit is connect with the second input terminal of the inverter circuit.
It further, further include under-voltage overcurrent protection module, second voltage sampling module, current sampling module, it is described under-voltage
Overcurrent protection module is arranged on the series circuit of the output end of the photo-voltaic power supply, power resistor, the photo-voltaic power supply it is defeated
Outlet is connect with the first input end of the under-voltage overcurrent protection module, the first output end of the under-voltage overcurrent protection module with
The power resistor connection, the second input terminal of the second output terminal of the core processor and the under-voltage overcurrent protection module
Connection, the first input end of the inverter circuit are connect with the input terminal of the second voltage sampling module, the second voltage
The output end of sampling module is connect with the second input terminal of the core processor, the input terminal of the current sampling module and institute
Network system connection is stated, the output end of the current sampling module is connect with the third input terminal of the core processor.
It further, further include first voltage sampling module, the input terminal and the photovoltaic of the first voltage sampling module
The output end of power supply connects, and the output end of the first voltage sampling module and the 4th input terminal of the core processor connect
It connects.
Further, the inverter circuit is DC-AC full bridge inverter, and the SPWM driving circuit drives including the first SPWM
The input terminal of dynamic circuit and the 2nd SPWM driving circuit, the first SPWM driving circuit and the 2nd SPWM driving circuit with it is described
First output end of core processor connects, and the second input terminal of the inverter circuit includes two input terminals, and described first
The output end of SPWM driving circuit and the 2nd SPWM driving circuit respectively with an input terminal in described two input terminals and another
One input terminal connection, the first SPWM driving circuit and the 2nd SPWM driving circuit export SPWM of the two-way reverse phase with dead zone
Wave.
Further, the SPWM driving circuit is IR2014 driving chip.
Further, the core processor is STM32 single-chip microcontroller.
It further, further include user terminal, bluetooth module, the user terminal, bluetooth module, the core processor
5th input terminal is sequentially connected in series.
It further, further include display, the display is connect with the third output end of the core processor.
Further, the display is liquid crystal display.
The utility model has the beneficial effects that: (1) uses SPWM Technique, by the letter for generating sinusoidal signal
Number generator, zero-crossing comparator, core processor and SPWM driving circuit generate SPWM wave control inverter circuit and carry out inversion, light
The inversion efficiency for lying prostrate electricity generation grid-connecting system is high.(2) there is under-voltage overcurrent protection function, the safety of photovoltaic power generation grid-connecting system
It is good.(3) DC-AC inverter circuit uses full bridge inverter, and the loss of photovoltaic power generation grid-connecting system is low, high-efficient, stability is strong.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of photovoltaic power generation grid-connecting system one embodiment of the utility model.
Fig. 2 is the structural schematic diagram of another embodiment of the photovoltaic power generation grid-connecting system of the utility model.
Specific embodiment
Brief description is made to specific embodiment of the present utility model with reference to the accompanying drawing.
As shown in Figure 1, a kind of photovoltaic power generation grid-connecting system, including photo-voltaic power supply, power resistor, inverter circuit, transformer,
Signal generator, zero-crossing comparator, core processor and SPWM driving circuit, the output end of the photo-voltaic power supply, power resistor,
The first input end of the inverter circuit is sequentially connected in series, and the input terminal of the output end of the inverter circuit and the transformer connects
It connects, the output end of the transformer is connect with network system, and the signal generator generates sine wave signal, and the signal occurs
The output end of device, the zero-crossing comparator, the core processor first input end be sequentially connected in series, the core processor
First output end is connect with the input terminal of the SPWM driving circuit, the output end of the SPWM driving circuit and inversion electricity
Second input terminal on road connects.STM single-chip microcontroller can be selected in the core processor.
The working principle of above-mentioned photovoltaic power generation grid-connecting system is as follows: the alternating current that photovoltaic generating system issues is by photo-voltaic power supply
Output inputs inverter circuit after power resistor divides and carries out inversion.The sine wave that signal generator generates, through Zero-cross comparator
After device, single-chip microcontroller acquires its signal；SPWM wave is generated further according to collected signal, after SPWM drives, controls inversion
Circuit realizes that the inversion of direct current to alternating current, inversion are followed by transformer boosting, can be effectively reduced the loss of circuit, improve
Inversion efficiency.
As shown in Fig. 2, further include under-voltage overcurrent protection module, second voltage sampling module, current sampling module, it is described to owe
Pressure overcurrent protection module is arranged on the series circuit of the output end of the photo-voltaic power supply, power resistor, the photo-voltaic power supply
Output end is connect with the first input end of the under-voltage overcurrent protection module, the first output end of the under-voltage overcurrent protection module
It is connect with the power resistor, the second input of the second output terminal of the core processor and the under-voltage overcurrent protection module
End connection, the first input end of the inverter circuit are connect with the input terminal of the second voltage sampling module, second electricity
Pressure sampling module output end connect with the second input terminal of the core processor, the input terminal of the current sampling module and
The network system connection, the output end of the current sampling module are connect with the third input terminal of the core processor.Core
Heart processor monitors the output electric current of photovoltaic power generation grid-connecting system and the input voltage of inverter circuit in real time, when output electric current is big
System protection function is triggered when setting value or input voltage are less than setting value, cuts off direct-flow voltage regulation source to full bridge inverter
Power supply, photovoltaic power generation grid-connecting system it is highly-safe.
It further include first voltage sampling module, the input terminal of the first voltage sampling module is defeated with the photo-voltaic power supply
Outlet connection, the output end of the first voltage sampling module are connect with the 4th input terminal of the core processor.At core
Device is managed according to the ratio of the output voltage of photo-voltaic power supply and the input voltage of inverter circuit, the duty ratio of SPWM wave is adjusted, has
It is high that precision can be controlled to the function of the MPPT maximum power point tracking of photovoltaic generating system.
The inverter circuit is DC-AC full bridge inverter, and the SPWM driving circuit includes the first SPWM driving circuit
With the 2nd SPWM driving circuit, at the input terminal of the first SPWM driving circuit and the 2nd SPWM driving circuit and the core
The first output end connection of device is managed, the second input terminal of the inverter circuit includes two input terminals, the first SPWM driving
The output end of circuit and the 2nd SPWM driving circuit respectively in described two input terminals an input terminal and another input
End connection, the first SPWM driving circuit and the 2nd SPWM driving circuit export SPWM wave of the two-way reverse phase with dead zone.Full-bridge
Inverter circuit is composed of two half-bridge circuits, and four switching tubes are diagonally two-by-two a pair, forms two pairs of bridge arm alternate conductions
180 °, therefore full-bridge inverting needs SPWM wave driving of two groups of two-way reverse phases with dead zone, the specific SPWM driving circuit can
It is selected as IR2014 driving chip.
Further include user terminal, bluetooth module, the user terminal, bluetooth module, the core processor it is the 5th defeated
Enter end to be sequentially connected in series, further include display, the display is connect with the third output end of the core processor, the display
Liquid crystal display can be selected in device.User terminal can be the end PC or bluetooth cellular phone, the Bluetooth adapter or indigo plant of bluetooth module and PC
It, can be easy to control by the end PC and Blue Tooth mobile phone remote-control system after the connection of tooth mobile phone.Core processor to output electric current and
The real time monitoring of input voltage may be displayed on liquid crystal display, convenient for real time monitoring.
The utility model is not limited to above-mentioned specific embodiment, and various modifications and changes may be made to the present invention.
All foundation the technical essence of the utility model, should all to embodiment of above any modification, equivalent replacement, improvement and so on
Included in the protection scope of the utility model.
Claims (9)
1. a kind of photovoltaic power generation grid-connecting system, it is characterised in that: including photo-voltaic power supply, power resistor, inverter circuit, transformer,
Signal generator, zero-crossing comparator, core processor and SPWM driving circuit, the output end of the photo-voltaic power supply, power resistor,
The first input end of the inverter circuit is sequentially connected in series, and the input terminal of the output end of the inverter circuit and the transformer connects
It connects, the output end of the transformer is connect with network system, and the signal generator generates sine wave signal, and the signal occurs
The output end of device, the zero-crossing comparator, the core processor first input end be sequentially connected in series, the core processor
First output end is connect with the input terminal of the SPWM driving circuit, the output end of the SPWM driving circuit and inversion electricity
Second input terminal on road connects.
2. photovoltaic power generation grid-connecting system according to claim 1, which is characterized in that further include under-voltage overcurrent protection module,
Second voltage sampling module, current sampling module, the under-voltage overcurrent protection module be arranged in the photo-voltaic power supply output end,
On the series circuit of power resistor, the first input end of the output end of the photo-voltaic power supply and the under-voltage overcurrent protection module connects
It connects, the first output end of the under-voltage overcurrent protection module is connect with the power resistor, and the second of the core processor is defeated
Outlet is connect with the second input terminal of the under-voltage overcurrent protection module, the first input end of the inverter circuit and described second
The input terminal of voltage sample module connects, and the second of the output end of the second voltage sampling module and the core processor is defeated
Enter end connection, the input terminal of the current sampling module is connect with the network system, the output end of the current sampling module
It is connect with the third input terminal of the core processor.
3. photovoltaic power generation grid-connecting system according to claim 2, which is characterized in that it further include first voltage sampling module,
The input terminal of the first voltage sampling module is connect with the output end of the photo-voltaic power supply, the first voltage sampling module
Output end is connect with the 4th input terminal of the core processor.
4. photovoltaic power generation grid-connecting system according to claim 3, which is characterized in that the inverter circuit is DC-AC full-bridge
Inverter circuit, the SPWM driving circuit include the first SPWM driving circuit and the 2nd SPWM driving circuit, the first SPWM
The input terminal of driving circuit and the 2nd SPWM driving circuit is connect with the first output end of the core processor, the inversion electricity
Second input terminal on road includes two input terminals, the output end point of the first SPWM driving circuit and the 2nd SPWM driving circuit
Not in described two input terminals an input terminal and another input terminal connect, the first SPWM driving circuit and second
SPWM driving circuit exports SPWM wave of the two-way reverse phase with dead zone.
5. photovoltaic power generation grid-connecting system according to claim 4, which is characterized in that the SPWM driving circuit is IR2014
Driving chip.
6. photovoltaic power generation grid-connecting system according to claim 1, which is characterized in that the core processor is that STM32 is mono-
Piece machine.
7. photovoltaic power generation grid-connecting system according to claim 5, which is characterized in that it further include user terminal, bluetooth module,
The user terminal, bluetooth module, the core processor the 5th input terminal be sequentially connected in series.
8. photovoltaic power generation grid-connecting system according to claim 7, which is characterized in that it further include display, the display
It is connect with the third output end of the core processor.
9. photovoltaic power generation grid-connecting system according to claim 8, which is characterized in that the display is liquid crystal display.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920176859.6U CN209402170U (en) | 2019-02-01 | 2019-02-01 | A kind of photovoltaic power generation grid-connecting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920176859.6U CN209402170U (en) | 2019-02-01 | 2019-02-01 | A kind of photovoltaic power generation grid-connecting system |
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| Publication Number | Publication Date |
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| CN209402170U true CN209402170U (en) | 2019-09-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109698520A (en) * | 2019-02-01 | 2019-04-30 | 长兴博瑞能源有限公司 | A kind of photovoltaic power generation grid-connecting system |
-
2019
- 2019-02-01 CN CN201920176859.6U patent/CN209402170U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109698520A (en) * | 2019-02-01 | 2019-04-30 | 长兴博瑞能源有限公司 | A kind of photovoltaic power generation grid-connecting system |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190917 Termination date: 20210201 |