CN203707802U - Photovoltaic grid connection power supply device - Google Patents
Photovoltaic grid connection power supply device Download PDFInfo
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- CN203707802U CN203707802U CN201420065116.9U CN201420065116U CN203707802U CN 203707802 U CN203707802 U CN 203707802U CN 201420065116 U CN201420065116 U CN 201420065116U CN 203707802 U CN203707802 U CN 203707802U
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- module
- inversion
- grid
- voltage
- chip microcomputer
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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
Abstract
The utility model discloses a photovoltaic grid connection power supply device. The device comprises a photovoltaic battery pack and a grid connection mechanism allowing the photovoltaic battery pack to be in grid connection with the commercial power. The device is characterized in that the grid connection mechanism comprises a main control module provided with a single-chip microcomputer. The main control module is connected to a display module, a DC-AC inversion module, a voltage sampling module and a phase lock module, wherein the phase lock module is connected to the voltage sampling module. The photovoltaic battery pack is connected to the DC-AC inversion module through an over-current and under-voltage protective module. The DC-AC inversion module is connected to the voltage sampling module through an inversion output processing module. The inversion output processing module is connected to the over-current and under-voltage protective module. The photovoltaic grid connection power supply device has an improved system, and is advantaged by being high in efficiency, low in grid connection waveform total harmonic wave distortion, good in tracking and safety performance, and improved in anti-interference measures and protective functions.
Description
Technical field
The utility model relates to field of solar energy, relates to specifically a kind of solar energy conversion power supply unit, particularly relates to a kind of grid-connected electric supply installation.
Background technology
Grid-connected technology, as a kind of efficient technique of rainwater utilization of clean energy resource, is gathered around and is had wide practical use.But the nowadays grid-connected many dependence on import of core technology, the especially aspect such as system architecture and control algolithm of China, seldom has outstanding achievement in research to occur.Therefore the photovoltaic parallel in system of, developing practicality and high efficiency is very necessary and is very promising.Wherein, the core difficult point that system closed-loop control and security monitoring part are system, can the system that directly determined be moved with security and stability.
The basic principle of DC/AC inversion transformation technique is for example, by semiconductor power switch device (SCR, GTO, GTR, IGBT and power MOSFET module etc.) the effect that turns on and off, direct current energy is transformed into AC energy, is therefore a kind of electrical energy changer.Can from the direct current energy such as storage battery, solar cell conversion obtain quality higher, can meet the AC energy of load to voltage and frequency requirement.Be used widely in occasions such as the transmission of alternating current machine, uninterrupted power supply (UPS), variable frequency power supply, active filter, electric network reactive compensation devices.Due to be by semiconductor power switch device turn on and off realize electric energy conversion, therefore conversion efficiency is higher.But the waveform of conversion output is very poor, the square wave that contains quite a lot of harmonic components, and the output of most application scenario requirement inverter is desirable sine wave.
Summary of the invention
The purpose of this utility model is to provide a kind of by photovoltaic cell group and the grid-connected grid-connected electric supply installation of civil power.
The utility model is to adopt following technical scheme to realize its goal of the invention, a kind of grid-connected electric supply installation, it comprises photovoltaic cell group and by photovoltaic cell group and the grid-connected grid-connected mechanism of civil power, described grid-connected mechanism comprises the main control module that is provided with single-chip microcomputer, the phase-locked module that main control module is connected with display module, DC-AC inversion module, voltage sample module, is connected with voltage sample module; Described photovoltaic cell group is connected with DC-AC inversion module through overcurrent under-voltage protection module; DC-AC inversion module is connected with voltage sample module through inversion output processing module; Inversion output processing module is connected with overcurrent under-voltage protection module again.
The electric energy of photovoltaic cell group output is converted to alternating current by DC-AC inversion module by direct current through overcurrent under-voltage protection module (relay), then by inversion output processing module carry out filtering, boost after output grid-connected with civil power.
Voltage sample module gathers ac voltage signal, frequency and the phase signal of inversion output processing module, and the ac voltage signal of collection is converted to d. c. voltage signal delivers to the single-chip microcomputer of main control module and process, the frequency collecting, phase signal (with the voltage signal of inversion output same frequency homophase) are delivered to phase-locked module simultaneously.
The frequency of the reference signal of frequency, phase signal and the phase-locked module of input that phase-locked module collects voltage sample module and phase signal relatively after, output feedback signal is sent into the single-chip microcomputer of main control module and is processed.
The single-chip microcomputer of main control module is by the signal obtaining (voltage signal of voltage sample module output, and frequency, the phase signal of the output of phase-locked module) dynamically show by display module after processing, and according to the SPWM ripple control DC-AC inversion module of the signal dynamics regulation output obtaining.
Overcurrent under-voltage protection module described in the utility model comprises the undervoltage detection circuit, the over-current detection circuit that are connected with relay; Photovoltaic cell group is connected with undervoltage detection circuit, relay respectively, and inversion output processing module is connected with over-current detection circuit.
Over-current detection circuit described in the utility model comprise detect resistance, RC filter, operational amplifier, corresponding voltage comparator and with door, the output current of inversion output processing module after testing after resistance detection by RC filtering, then after being amplified by operational amplifier, send into comparator and reference voltage comparison; Set when electric current when electric current exceedes, over-current detection signal end output low level, by with corresponding gate control relay open circuit, self-recovering function after realizing overcurrent protection and fault and getting rid of.
Undervoltage detection circuit described in the utility model comprise corresponding voltage comparator and with door; input voltage and reference voltage connect respectively anti-, the positive terminal of corresponding voltage comparator; export to corresponding and gate control relay after relatively through corresponding voltage comparator; in the time that input voltage is too low, undervoltage detection circuit output is low level; control relay disconnects, and gets rid of rear self-recovering function to realize under-voltage protection and fault.
DC-AC inversion module described in the utility model comprises full-bridge inverting topological circuit, 2 half-bridge driven chip I R21094; Described full-bridge topology circuit is made up of 4 N-type switch mosfet pipe IRF540; Every IR21094 drives respectively 2 IRF540.
The SPWM ripple modulation signal that single-chip microcomputer produces is divided into homophase and exports to respectively each IR21094 with reverse two paths of signals, and the break-make of 4 switching tube IRF540 is controlled in the output of 2 IR21094 simultaneously, realizes the inversion output of control inputs direct current to output AC.
Topological structure refers to the interconnective form of each website in network, and in local area network (LAN), clearer and more definite saying is exactly the type of attachment of file server, work station and cable etc.Present topmost topological structure has bus-type topology, star topology, ring topology and their mixed type.
Time output is more stable in order to realize transformation and filtering clutter for the utility model, and described inversion output processing module comprises inverter, filter circuit.
The single-chip microcomputer of main control module described in the utility model is Atmega128 single-chip microcomputer, this single-chip microcomputer has 8 AVR microcontrollers of the In-System Programmable FLASH of 128KB, have 8-bit microprocessor, the advanced RISC mechanism of high-effect, low-power consumption and have 8 bit timing devices and the 16 bit timing devices of PWM function, 8 10, tunnel ADC have improved the sampling precision of voltage and electric current.
For maintaining normal work, the utility model is also provided with accessory power supply module, and it comprises transformer, rectifier diode, filter capacitor and integrated voltage-stabilized chip LM2575T-5.0, LM2576T-ADJ; Civil power is after transformation, rectification and filtering; export respectively the stable 5V voltage in a road to the single-chip microcomputer power supply in main control module via integrated voltage-stabilized chip LM2575T-5.0, LM2576T-ADJ again, Ji Yi road 12V and following adjustable voltage are overcurrent under-voltage protection module, DC-AC inversion module, display module, inversion output module, voltage sample module, phase-locked module for power supply.
For realizing the visual of system work at present state, display module described in the utility model adopts liquid crystal LCD12864.
Owing to adopting technique scheme, the utility model has been realized goal of the invention preferably, and its function system is perfect, has high efficiency, and grid-connected waveform total harmonic distortion is low, tracking performance and security performance excellence, the advantage such as interference protection measure and defencive function are perfect.
Accompanying drawing explanation
Fig. 1 is structural principle schematic block diagram of the present utility model.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail.
As shown in Figure 1, a kind of grid-connected electric supply installation, it comprises photovoltaic cell group and by photovoltaic cell group and the grid-connected grid-connected mechanism of civil power, described grid-connected mechanism comprises the main control module that is provided with single-chip microcomputer, the phase-locked module that main control module is connected with display module, DC-AC inversion module, voltage sample module, is connected with voltage sample module; Described photovoltaic cell group is connected with DC-AC inversion module through overcurrent under-voltage protection module (relay); DC-AC inversion module is connected with voltage sample module through inversion output processing module; Inversion output processing module is connected with overcurrent under-voltage protection module again.
The electric energy of photovoltaic cell group output is converted to alternating current by DC-AC inversion module by direct current through overcurrent under-voltage protection module (relay), then by inversion output processing module carry out filtering, boost after output grid-connected with civil power.
Voltage sample module gathers ac voltage signal, frequency and the phase signal of inversion output processing module, and the ac voltage signal of collection is converted to d. c. voltage signal delivers to the single-chip microcomputer of main control module and process, the frequency collecting, phase signal (with the voltage signal of inversion output same frequency homophase) are delivered to phase-locked module simultaneously.
The frequency of the reference signal of frequency, phase signal and the phase-locked module of input that phase-locked module collects voltage sample module and phase signal relatively after, output feedback signal is sent into the single-chip microcomputer of main control module and is processed.
The single-chip microcomputer of main control module is by the signal obtaining (voltage signal of voltage sample module output, and frequency, the phase signal of the output of phase-locked module) dynamically show by display module after processing, and according to the SPWM ripple control DC-AC inversion module of the signal dynamics regulation output obtaining.
Overcurrent under-voltage protection module described in the utility model comprises the undervoltage detection circuit, the over-current detection circuit that are connected with relay; Photovoltaic cell group is connected with undervoltage detection circuit, relay respectively, and inversion output processing module is connected with over-current detection circuit.
Overcurrent under-voltage protection module described in the utility model is also provided with warning light.
Over-current detection circuit described in the utility model comprise detect resistance, RC filter, operational amplifier, corresponding voltage comparator and with door, the output current of inversion output processing module after testing after resistance detection by RC filtering, then after being amplified by operational amplifier, send into comparator and reference voltage comparison; Set when electric current when electric current exceedes, over-current detection signal end output low level, by with corresponding gate control relay open circuit, self-recovering function after realizing overcurrent protection and fault and getting rid of.
Undervoltage detection circuit described in the utility model comprise corresponding voltage comparator and with door; input voltage and reference voltage connect respectively anti-, the positive terminal of corresponding voltage comparator; export to corresponding and gate control relay after relatively through corresponding voltage comparator; in the time that input voltage is too low, undervoltage detection circuit output is low level; control relay disconnects; get rid of rear self-recovering function to realize under-voltage protection and fault, indicator light carries out bright light warning simultaneously.
DC-AC inversion module described in the utility model comprises full-bridge inverting topological circuit, 2 half-bridge driven chip I R21094; Described full-bridge topology circuit is made up of 4 N-type switch mosfet pipe IRF540; Every IR21094 drives respectively 2 IRF540.
The SPWM ripple modulation signal that single-chip microcomputer produces is divided into homophase and exports to respectively each IR21094 with reverse two paths of signals, and the break-make of 4 switching tube IRF540 is controlled in the output of 2 IR21094 simultaneously, realizes the inversion output of control inputs direct current to output AC.
Topological structure refers to the interconnective form of each website in network, and in local area network (LAN), clearer and more definite saying is exactly the type of attachment of file server, work station and cable etc.Present topmost topological structure has bus-type topology, star topology, ring topology and their mixed type.
Time output is more stable in order to realize transformation and filtering clutter for the utility model, and described inversion output processing module comprises inverter, filter circuit.
The single-chip microcomputer of main control module described in the utility model is Atmega128 single-chip microcomputer, this single-chip microcomputer has 8 AVR microcontrollers of the In-System Programmable FLASH of 128KB, have 8-bit microprocessor, the advanced RISC mechanism of high-effect, low-power consumption and have 8 bit timing devices and the 16 bit timing devices of PWM function, 8 10, tunnel ADC have improved the sampling precision of voltage and electric current.
For maintaining normal work, the utility model is also provided with accessory power supply module, and it comprises transformer, rectifier diode, filter capacitor and integrated voltage-stabilized chip LM2575T-5.0, LM2576T-ADJ; Civil power is after transformation, rectification and filtering; export respectively the stable 5V voltage in a road to the single-chip microcomputer power supply in main control module via integrated voltage-stabilized chip LM2575T-5.0, LM2576T-ADJ again, Ji Yi road 12V and following adjustable voltage are overcurrent under-voltage protection module, DC-AC inversion module, display module, inversion output module, voltage sample module, phase-locked module for power supply.
For realizing the visual of system work at present state, display module described in the utility model adopts liquid crystal LCD12864.
Claims (7)
1. a grid-connected electric supply installation, it comprises photovoltaic cell group and by photovoltaic cell group and the grid-connected grid-connected mechanism of civil power, it is characterized in that described grid-connected mechanism comprises the main control module that is provided with single-chip microcomputer, the phase-locked module that main control module is connected with display module, DC-AC inversion module, voltage sample module, is connected with voltage sample module; Described photovoltaic cell group is connected with DC-AC inversion module through overcurrent under-voltage protection module; DC-AC inversion module is connected with voltage sample module through inversion output processing module; Inversion output processing module is connected with overcurrent under-voltage protection module again.
2. grid-connected electric supply installation according to claim 1, is characterized in that described overcurrent under-voltage protection module comprises the undervoltage detection circuit, the over-current detection circuit that are connected with relay; Photovoltaic cell group is connected with undervoltage detection circuit, relay respectively, and inversion output processing module is connected with over-current detection circuit.
3. grid-connected electric supply installation according to claim 1, is characterized in that described DC-AC inversion module comprises full-bridge inverting topological circuit, 2 half-bridge driven chip I R21094; Described full-bridge topology circuit is made up of 4 N-type switch mosfet pipe IRF540.
4. grid-connected electric supply installation according to claim 2, is characterized in that described DC-AC inversion module comprises full-bridge inverting topological circuit, 2 half-bridge driven chip I R21094; Described full-bridge topology circuit is made up of 4 N-type switch mosfet pipe IRF540.
5. according to the grid-connected electric supply installation described in claim 1 or 2 or 3 or 4, it is characterized in that described inversion output processing module comprises inverter, filter circuit; Described phase-locked module comprises CD4046,2 74LS161.
6. according to the grid-connected electric supply installation described in claim 1 or 2 or 3 or 4, it is characterized in that described single-chip microcomputer is Atmega128 single-chip microcomputer.
7. grid-connected electric supply installation according to claim 5, is characterized in that described single-chip microcomputer is Atmega128 single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420065116.9U CN203707802U (en) | 2014-02-14 | 2014-02-14 | Photovoltaic grid connection power supply device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420065116.9U CN203707802U (en) | 2014-02-14 | 2014-02-14 | Photovoltaic grid connection power supply device |
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| Publication Number | Publication Date |
|---|---|
| CN203707802U true CN203707802U (en) | 2014-07-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420065116.9U Expired - Fee Related CN203707802U (en) | 2014-02-14 | 2014-02-14 | Photovoltaic grid connection power supply device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203707802U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106026180A (en) * | 2016-07-18 | 2016-10-12 | 哈尔滨理工大学 | Solar photovoltaic grid-connected inverter |
-
2014
- 2014-02-14 CN CN201420065116.9U patent/CN203707802U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106026180A (en) * | 2016-07-18 | 2016-10-12 | 哈尔滨理工大学 | Solar photovoltaic grid-connected inverter |
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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 |
Granted publication date: 20140709 Termination date: 20150214 |
|
| EXPY | Termination of patent right or utility model |