CN102684297A - Solar power generating system and (N+1) backup power distribution control method thereof - Google Patents
Solar power generating system and (N+1) backup power distribution control method thereof Download PDFInfo
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- CN102684297A CN102684297A CN2012101520292A CN201210152029A CN102684297A CN 102684297 A CN102684297 A CN 102684297A CN 2012101520292 A CN2012101520292 A CN 2012101520292A CN 201210152029 A CN201210152029 A CN 201210152029A CN 102684297 A CN102684297 A CN 102684297A
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
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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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Abstract
The embodiment of the invention discloses a solar power generating system and an (N+1) backup power distribution control method thereof, which relates to the technical field of the solar and is favorable for increasing the utilization rate of the energy produced by a solar battery, improving the overall power supply efficiency and systematic stability of the solar power generating system and realizing an (N+1) backup function of a solar controller. The solar power generating system comprises a plurality of solar batteries, wherein each solar battery is connected with a solar controller which is used for making the solar battery work at a maximal power point of the solar battery, and the solar power generating system also comprises a backup solar controller and a switching unit, wherein the switching unit is used for switching the solar battery to be connected with the backup solar controller according to a received control order.
Description
Technical field
The present invention relates to technical field of solar, relate in particular to a kind of solar power system and N+1 thereof backup power distribution control method.
Background technology
Because global non-renewable energy resources are in short supply day by day; Various regenerative resources come into one's own day by day, and at present, the application of the solar energy in the regenerative resource is comparatively ripe; Along with the further decline of solar cell price, the application prospect of solar cell is more and more wide.
The output characteristic of solar cell has nonlinear characteristic; Its power output is influenced by the multiple of intensity of illumination, ambient temperature and load state; In order to make solar cell can be operated in the peak power output point, in order to reduce system cost, improve entire system efficient simultaneously; Be in the power supply system for communications of the energy with solar energy; A kind of common method is the generating voltage of detecting real-time solar cell, and follows the trail of the ceiling voltage current value, and solar cell is always worked near the maximum power point.This process is called MPPT maximum power point tracking; The MPPT maximum power point tracking controller for solar have output voltage stabilization, volume little, be convenient to safeguard and advantages such as dilatation, make the MPPT maximum power point tracking controller for solar become the mainstream technology of present stage solar energy development.
The inventor finds in realizing process of the present invention; Solar power system of the prior art provides electric energy through the combination of single or a plurality of MPPT maximum power point tracking controller for solar and solar cell to application system; Wherein, MPPT maximum power point tracking controller for solar and solar battery group connect one to one, and follow the tracks of coupled solar cell peak power output point through the MPPT maximum power point tracking controller for solar, when a MPPT maximum power point tracking controller for solar can not use owing to fault; Can't follow the tracks of the maximum power point of coupled solar cell; The energy that causes this solar cell to produce can not be fully utilized, and has reduced the energy utilization ratio that solar cell produced, thereby has reduced the whole efficiency of solar power system.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of solar power system and N+1 backup power distribution control method thereof; Help improving the energy utilization ratio that solar cell produces; Improve the bulk supply efficient and the stability of a system of solar power system, realized the N+1 backup functionality of controller for solar.
For solving the problems of the technologies described above, solar power system of the present invention and fault handling method thereof adopt following technical scheme:
A kind of solar power system comprises: several solar cells; Each solar cell connects one and is used to make the controller for solar of said solar cell working at the maximum power point of said solar cell, also comprises:
Subsequent use controller for solar;
Switch unit is used for according to the control command that receives the solar cell switching being connected to said subsequent use controller for solar.
A kind of N+1 backup power distribution control method of solar power system, said solar power system comprises: several solar cells; Each solar cell connects one and is used to make the controller for solar of said solar cell working at the maximum power point of said solar cell, and the power distribution control method of said solar power system comprises:
Switch unit is connected to subsequent use controller for solar according to the control command that receives with the solar cell switching.
In the technical scheme of present embodiment, said solar power system comprises: this solar power system comprises: several solar cells; Each solar cell connects one and is used to make the controller for solar of said solar cell working at the maximum power point of said solar cell, also comprises: subsequent use controller for solar; Switch unit is used for according to the control command that receives the solar cell switching being connected to said subsequent use controller for solar.This electricity generation system can improve the stability of the power output of solar power system; Can improve the energy utilization ratio that solar cell is produced; Can also improve the whole efficiency of this solar power system, realize the N+1 backup functionality of controller for solar.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; The accompanying drawing of required use is done to introduce simply in will describing embodiment below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation one of the solar power system in the embodiment of the invention;
Fig. 2 is the structural representation two of the solar power system in the embodiment of the invention;
Fig. 3 is the flow chart one of the N+1 backup method of solar power system in the embodiment of the invention;
Fig. 4 is the flowchart 2 of the N+1 backup method of solar power system in the embodiment of the invention;
Fig. 5 is the flow chart 3 of the N+1 backup method of solar power system in the embodiment of the invention.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
Embodiment one
The embodiment of the invention provides a kind of solar power system, and is as shown in Figure 1, and this solar power system comprises: several solar cells; Each solar cell connects one and is used to make the controller for solar of said solar cell working at the maximum power point of said solar cell, also comprises:
Subsequent use controller for solar;
Switch unit is used for according to the control command that receives the solar cell switching being connected to said subsequent use controller for solar.
In the prior art; The controller for solar that the said solar cell of in the solar power system each is only corresponding with one connects, because controller for solar is more fragile, in case controller for solar damages; Because solar irradiation intensity is unstable; The solar cell that links to each other with the controller for solar that damages receives the influence of the intensity of solar irradiation, can't influence the operate as normal of the circuit or the power consumption equipment of load to the circuit or the continual and steady power of power consumption equipment output of load.
In embodiments of the present invention; As shown in Figure 1; Said solar power system comprises subsequent use controller for solar and switch unit; When said switch unit received control command, switch unit was according to control command, the switch between controller for solar through switch failure and the corresponding solar cell thereof (switch form comprise and be not limited to various ways such as electromagnetic relay, metal-oxide layer-semiconductor-field-effect transistor, logic switch); The corresponding solar cell that connects of controller for solar of fault is connected on the subsequent use controller for solar; Utilize subsequent use controller for solar to substitute the controller for solar of fault, guaranteed that solar electric power supply system can export continual and steady effective power, guaranteed by the circuit of the load of solar power system power supply or the operate as normal of power consumption equipment.
Further; Owing to have several even more than ten solar cell in solar power system usually; In order to make said switch unit can be exactly the solar cell of correspondence be connected on the subsequent use controller for solar; Particularly; Said switch unit carries out correct switching according to identifier entrained in the control command, and solar cell that will corresponding connection with the controller for solar of fault is connected on the subsequent use controller for solar, wherein; This identifier can be and anyly makes said switch unit differentiate the identifier of the switch of required switching, and entrained identifier also can be the identifier of the controller for solar of solar cell or fault in the said control command.
Further, as shown in Figure 1, said solar power system also comprises:
Monitoring unit is used to detect the malfunction of each said controller for solar, when detecting the controller for solar fault, to said switch unit output control command.
In a concrete situation of present embodiment; The two-way switch of supposing this moment is an electromagnetic relay; When the arbitrary controller for solar operate as normal in the said solar power system; Electromagnetic relay is in normally-closed contact; This moment, the cathode output end of each solar cell linked to each other with the negative input of the controller for solar of corresponding connection through corresponding electromagnetic relay; The cathode output end of each solar cell links to each other with the electrode input end of the controller for solar of corresponding connections through corresponding electromagnetic relay, and the cathode output end of each controller for solar is connected with-48 volts circuit, and the electromagnetic relay that the cathode output end of each controller for solar passes through correspondence links to each other with the loop.When a certain controller for solar (for example controller for solar 1) fault wherein; Monitoring unit can detect the malfunction of controller for solar 1 rapidly; Inquire the identifier of the solar cell 1 that links to each other with said controller for solar 1, send the control command of the identifier that carries this solar cell 1 afterwards to said switch unit.
When said switch unit receives the control command of this identifier that carries said solar cell 1; Switch unit gets into operating state; Electromagnetic relay between the cathode output end through breaking off said solar cell 1 and the electrode input end of controller for solar 1; And break off the electromagnetic relay between the negative input of cathode output end and controller for solar 1 of said solar cell 1; Make two electromagnetic relays all no longer be in normally-closed contact, at this moment, under the effect of said electromagnetic relay; The cathode output end of said solar cell 1 will be connected to the electrode input end of subsequent use controller for solar; The cathode output end of said solar cell 1 will be connected to the negative input of subsequent use controller for solar, make said solar power system can keep the situation of its normal power supply, be continuously the circuit or the power consumption equipment power supply of load effectively.
In addition; The annexation of said solar power system also can be shown in Figure 2; With the difference of Fig. 1 do; The cathode output end of each solar cell of Fig. 2 connects with corresponding controller for solar and subsequent use controller for solar all the time; And be provided with switch between the negative input of the cathode output end of each solar cell among Fig. 1 and corresponding controller for solar, and can pass through diverter switch, the cathode output end of the solar cell that connects with the negative input of corresponding controller for solar originally is connected to the negative input of subsequent use controller for solar.
General, the rated output power of all controller for solar in the same solar power system is all consistent, and promptly the rated output power of said subsequent use controller for solar is consistent with the rated output power of arbitrary controller for solar.
Need to prove that can be simultaneously the corresponding solar cell that connects of controller for solar of a plurality of faults be connected to said subsequent use controller for solar, this moment, the power of said subsequent use controller for solar output was its specified power output.
In addition, each solar cell and the controller for solar that directly links to each other are equivalent to a plurality of power supplys of load circuit, and parallel connection between these a plurality of power supplys.In another concrete situation of the embodiment of the invention; When the solar irradiation intensity in (for example rainy weather, morning or at dusk etc. of one day) is more weak at this moment; The number of the photon of the sunlight that each solar cell is received is well below the photon of the received sunlight of sunny weather; So also be significantly smaller than the power output of the same power supply when sunny this moment based on the power output of the power supply of solar cell; Required effective power in the time of load circuit this moment can't obtaining operate as normal is so load circuit can't operate as normal.
So, when said monitoring unit also is used for real output when said controller for solar and is less than or equal to the preset value of real output of controller for solar, to said switch unit output control command.
Need to prove that the preset value of the real output of said controller for solar can be provided with according to actual conditions by the relevant technologies personnel, and is general, this preset value can the rated output power of controller for solar 20% to 30% between.
When switch unit receives control command; Represent that promptly solar power system can't provide sufficient power output to said load circuit this moment; Load circuit can't operate as normal; In order to make that load circuit can operate as normal, switch unit is according to control command, and the solar cell of correspondence is connected on the subsequent use controller for solar; Particularly; Switch unit switches the controller for solar that solar cell is connected to according to identifier entrained in the control command, wherein, this identifier can be solar cell that switch or required switching between solar cell and the corresponding controller for solar connect or the hardware address of controller for solar, software address or other any make said switch unit identification, differentiate the identifier of solar cell.
After being connected to a plurality of solar cells on the subsequent use controller for solar, said subsequent use controller for solar just can be adjusted total power output of a plurality of solar cells, and final output meets the power of the rated power of this solar power system.
General, the controller for solar of being mentioned in the present embodiment can be the MPPT maximum power point tracking controller for solar, is the upgraded product of traditional solar charging/discharging controller.The MPPT maximum power point tracking controller for solar is understood the power points of the maximum in the real-time tracking solar panels, has given play to the maximum effect of solar panels.Voltage is high more, through maximal power tracing, just can export more electric weight, thereby improves charge efficiency.Theoretically, use the solar power system of MPPT maximum power point tracking controller for solar to improve 50% than traditional efficient.
In the technical scheme of present embodiment, said solar power system comprises: this solar power system comprises: several solar cells; Each solar cell connects one and is used to make the controller for solar of said solar cell working at the maximum power point of said solar cell, also comprises: subsequent use controller for solar; Switch unit is used for according to the control command that receives the solar cell switching being connected to said subsequent use controller for solar.This electricity generation system can improve the stability of the power output of solar power system; Can improve the energy utilization ratio that solar cell is produced; Can also improve the whole efficiency of this solar power system, realize the N+1 backup functionality of controller for solar.
Embodiment two
The embodiment of the invention provides a kind of power distribution control method of solar power system, and this solar power system comprises: several solar cells; Each solar cell connects one and is used to make the controller for solar of said solar cell working at the maximum power point of said solar cell, and as shown in Figure 3, the power distribution control method of this solar power system comprises:
Step S101, switch unit are connected to subsequent use controller for solar according to the control command that receives with the solar cell switching.
In the prior art; The controller for solar that the said solar cell of in the solar power system each is only corresponding with one connects, because controller for solar is more fragile, in case controller for solar damages; Because solar irradiation intensity is unstable; The solar cell that links to each other with the controller for solar that damages receives the influence of the intensity of solar irradiation, can't influence the operate as normal of the circuit or the power consumption equipment of load to the circuit or the continual and steady power of power consumption equipment output of load.
In embodiments of the present invention; As shown in Figure 3; Said solar power system comprises subsequent use controller for solar and switch unit; When said switch unit received control command, switch unit was according to control command, the switch between controller for solar through switch failure and the corresponding solar cell thereof (switch form comprise and be not limited to various ways such as electromagnetic relay, metal-oxide layer-semiconductor-field-effect transistor, logic switch); The corresponding solar cell that connects of controller for solar of fault is connected on the subsequent use controller for solar; Utilize subsequent use controller for solar to substitute the controller for solar of fault, guaranteed that solar electric power supply system can export continual and steady effective power, guaranteed by the circuit of the load of solar power system power supply or the operate as normal of power consumption equipment.
Further; Owing to have several even more than ten solar cell in solar power system usually; In order to make said switch unit can be exactly the solar cell of correspondence be connected on the subsequent use controller for solar; Particularly; Said switch unit carries out correct switching according to identifier entrained in the control command, and solar cell that will corresponding connection with the controller for solar of fault is connected on the subsequent use controller for solar, wherein; This identifier can be and anyly makes said switch unit differentiate the identifier of the switch of required switching, and entrained identifier also can be the identifier of the controller for solar of solar cell or fault in the said control command.
Further, as shown in Figure 4, before step S101, also comprise:
When step S201, monitoring unit detect the controller for solar fault, to said switch unit output control command.
In a concrete situation of present embodiment; The two-way switch of supposing this moment is an electromagnetic relay; When the arbitrary controller for solar operate as normal in the said solar power system; Electromagnetic relay is in normally-closed contact; This moment, the cathode output end of each solar cell linked to each other with the negative input of the controller for solar of corresponding connection through corresponding electromagnetic relay; The cathode output end of each solar cell links to each other with the electrode input end of the controller for solar of corresponding connections through corresponding electromagnetic relay, and the cathode output end of each controller for solar is connected with-48 volts circuit, and the electromagnetic relay that the cathode output end of each controller for solar passes through correspondence links to each other with the loop.When a certain controller for solar (for example controller for solar 1) fault wherein; Monitoring unit can detect the malfunction of controller for solar 1 rapidly; Inquire the identifier of the solar cell 1 that links to each other with said controller for solar 1, send the control command of the identifier that carries this solar cell 1 afterwards to said switch unit.
When said switch unit receives the control command of this identifier that carries said solar cell 1; Switch unit gets into operating state; Electromagnetic relay between the cathode output end through breaking off said solar cell 1 and the electrode input end of controller for solar 1; And break off the electromagnetic relay between the negative input of cathode output end and controller for solar 1 of said solar cell 1; Make two electromagnetic relays all no longer be in normally-closed contact, at this moment, under the effect of said electromagnetic relay; The cathode output end of said solar cell 1 will be connected to the electrode input end of subsequent use controller for solar; The cathode output end of said solar cell 1 will be connected to the negative input of subsequent use controller for solar, make said solar power system can keep the situation of its normal power supply, be continuously the circuit or the power consumption equipment power supply of load effectively.
In addition; The annexation of said solar power system also can be shown in Figure 2; With the difference of Fig. 1 do; The cathode output end of each solar cell of Fig. 2 connects with corresponding controller for solar and subsequent use controller for solar all the time; And be provided with switch between the negative input of the cathode output end of each solar cell among Fig. 1 and corresponding controller for solar, and can pass through diverter switch, the cathode output end of the solar cell that connects with the negative input of corresponding controller for solar originally is connected to the negative input of subsequent use controller for solar.
General, the rated output power of all controller for solar in the same solar power system is all consistent, and promptly the rated output power of said subsequent use controller for solar is consistent with the rated output power of arbitrary controller for solar.
Need to prove that can be simultaneously the corresponding solar cell that connects of controller for solar of a plurality of faults be connected to said subsequent use controller for solar, this moment, the power of said subsequent use controller for solar output was its specified power output.
In addition, each solar cell and the controller for solar that directly links to each other are equivalent to a plurality of power supplys of load circuit, and parallel connection between these a plurality of power supplys.In another concrete situation of the embodiment of the invention; When the solar irradiation intensity in (for example rainy weather, morning or at dusk etc. of one day) is more weak at this moment; The number of the photon of the sunlight that each solar cell is received is well below the photon of the received sunlight of sunny weather; So also be significantly smaller than the power output of the same power supply when sunny this moment based on the power output of the power supply of solar cell; Required effective power in the time of load circuit this moment can't obtaining operate as normal is so load circuit can't operate as normal.
So, as shown in Figure 5, before step S101, also comprise:
When the real output that step S301, said monitoring unit detect controller for solar is less than or equal to the preset value of real output of controller for solar, to said switch unit output control command.
Need to prove that the preset value of the real output of said controller for solar can be provided with according to actual conditions by the relevant technologies personnel, and is general, this preset value can the rated output power of controller for solar 20% to 30% between.
When switch unit receives control command; Represent that promptly solar power system can't provide sufficient power output to said load circuit this moment; Load circuit can't operate as normal; In order to make that load circuit can operate as normal, switch unit is according to control command, and the solar cell of correspondence is connected on the subsequent use controller for solar; Particularly; Switch unit switches the controller for solar that solar cell is connected to according to identifier entrained in the control command, wherein, this identifier can be solar cell that switch or required switching between solar cell and the corresponding controller for solar connect or the hardware address of controller for solar, software address or other any make said switch unit identification, differentiate the identifier of solar cell.
After being connected to a plurality of solar cells on the subsequent use controller for solar, said subsequent use controller for solar just can be adjusted total power output of a plurality of solar cells, and final output meets the power of the rated power of this solar power system.
General, the controller for solar of being mentioned in the present embodiment can be the MPPT maximum power point tracking controller for solar, is the upgraded product of traditional solar charging/discharging controller.The MPPT maximum power point tracking controller for solar is understood the power points of the maximum in the real-time tracking solar panels, has given play to the maximum effect of solar panels.Voltage is high more, through maximal power tracing, just can export more electric weight, thereby improves charge efficiency.Theoretically, use the solar power system of MPPT maximum power point tracking controller for solar to improve 50% than traditional efficient.
In the technical scheme of present embodiment, said solar power system method comprises: switch unit is connected to subsequent use controller for solar according to the control command that receives with the solar cell switching.This electricity generation system can improve the stability of the power output of solar power system; Can improve the energy utilization ratio that solar cell is produced; Can also improve the whole efficiency of this solar power system, realize the N+1 backup functionality of controller for solar.
The above; Be merely embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technical staff who is familiar with the present technique field is in the technical scope that the present invention discloses; Can expect easily changing or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of said claim.
Claims (10)
1. a solar power system comprises: several solar cells; Each solar cell connects one and is used to make the controller for solar of said solar cell working at the maximum power point of said solar cell, it is characterized in that, also comprises:
Subsequent use controller for solar;
Switch unit is used for according to the control command that receives the solar cell switching being connected to said subsequent use controller for solar.
2. solar power system according to claim 1 is characterized in that, also comprises:
Monitoring unit is used to detect the malfunction of each said controller for solar, when detecting the controller for solar fault, to said switch unit output control command.
3. solar power system according to claim 1 and 2 is characterized in that,
When said monitoring unit also is used for real output when said controller for solar and is less than or equal to the preset value of real output of controller for solar, to said switch unit output control command.
4. according to the arbitrary described solar power system of claim 1-3, it is characterized in that,
Said control command carries the identifier of the corresponding solar cell that connects of said controller for solar.
5. according to the arbitrary described solar power system of claim 1-4, it is characterized in that,
Said controller for solar is the MPPT maximum power point tracking controller for solar.
6. the N+1 of a solar power system backs up power distribution control method, and said solar power system comprises: several solar cells; Each solar cell connects one and is used to make the controller for solar of said solar cell working at the maximum power point of said solar cell, it is characterized in that the power distribution control method of said solar power system comprises:
Switch unit is connected to subsequent use controller for solar according to the control command that receives with the solar cell switching.
7. method according to claim 6 is characterized in that, also comprises:
When monitoring unit detects the controller for solar fault, to said switch unit output control command.
8. method according to claim 6 is characterized in that, also comprises:
When the real output that said monitoring unit detects controller for solar is less than or equal to the preset value of real output of controller for solar, to said switch unit output control command.
9. according to the arbitrary described method of claim 6-8, it is characterized in that,
Said control command carries the identifier of the corresponding solar cell that connects of said controller for solar.
10. according to the arbitrary described method of claim 6-9, it is characterized in that,
Said controller for solar is the MPPT maximum power point tracking controller for solar.
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| CN108931973B (en) * | 2018-08-01 | 2020-02-21 | 珠海格力电器股份有限公司 | Photovoltaic control system, and control method and device of photovoltaic control system |
| US11837993B2 (en) | 2018-08-01 | 2023-12-05 | Gree Electric Appliances, Inc. Of Zhuhai | System for controlling a photovoltaic system, method and device for controlling the photovoltaic system |
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