CN105429594A - Photovoltaic assembly monitoring device and method - Google Patents
Photovoltaic assembly monitoring device and method Download PDFInfo
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- CN105429594A CN105429594A CN201510921062.0A CN201510921062A CN105429594A CN 105429594 A CN105429594 A CN 105429594A CN 201510921062 A CN201510921062 A CN 201510921062A CN 105429594 A CN105429594 A CN 105429594A
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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
Abstract
The invention relates to a photovoltaic assembly monitoring device and a method. The device comprises a sampling module, an analog-digital conversion module, a processing module and a power supply module, wherein the sampling module is used for collecting characteristic parameters of a photovoltaic assembly; the analog-digital conversion module is used for carrying out analog-digital conversion on the characteristic parameters and converting an analog signal of the characteristic parameters into a digital signal; the processing module is used for processing the digital signal and outputting a processing result; and the power supply module is used for providing power for the sampling module, the analog-digital conversion module and the processing module. By using the device and the method of the invention, a working state of the photovoltaic assembly can be monitored in real time and power generation efficiency of a photovoltaic array is increased.
Description
Technical field
The present invention relates to photovoltaic system field, particularly relate to a kind of photovoltaic module monitoring device and method.
Background technology
In photovoltaic generating system, normally several photovoltaic modulies being combined into a large photovoltaic array, converting solar energy into direct current by photovoltaic array, is then that alternating current is input in electrical network by combining inverter by DC conversion.
In actual use, in order to make photovoltaic array power output maximize, combining inverter needs output voltage and the output current of dynamic tracing photovoltaic array, and this function of combining inverter is called maximum power point tracking.But, owing to there is certain deviation in photovoltaic module manufacture, so the maximum power point of each photovoltaic module can slightly difference.After several photovoltaic modulies are combined into a large photovoltaic array, combining inverter cannot obtain the operating state of each photovoltaic module at any time, can only carry out approximate tracking to the maximum power point of whole photovoltaic array.Like this, due to the operating state of each photovoltaic module can not be monitored in time, whole photovoltaic array can be caused not to be operated in desirable maximum power point, to make the decrease in power generation efficiency of photovoltaic array.
In addition, in use, photovoltaic module there will be following failure problems: dust spot etc. blocks assembly, the electric bad connection of assembly, assembly decrease in power generation efficiency etc.Once photovoltaic module generation the problems referred to above, the generating efficiency of whole photovoltaic array can be affected.Be manually use thermal infrared imager to irradiate one by one photovoltaic module mostly at present, judge whether photovoltaic module breaks down according to infrared chart.But this monitoring mode to photovoltaic module needs manpower and the time of at substantial, especially for large-area photovoltaic array or the photovoltaic array being in Special geographical position, when not roughly fault coverage, be low-down by the efficiency manually investigated one by one, greatly can reduce the generating efficiency of photovoltaic array.
Summary of the invention
The invention provides a kind of photovoltaic module monitoring device and method, in order to realize the operating state of Real-Time Monitoring photovoltaic module, improve the generating efficiency of photovoltaic array.
The invention provides a kind of photovoltaic module monitoring device, comprising:
Sampling module, for gathering the characteristic parameter of described photovoltaic module;
Analog-to-digital conversion module, for carrying out analog-to-digital conversion to described characteristic parameter, is converted to digital signal by the analog signal of described characteristic parameter;
Processing module, for processing described digital signal, and exports result;
Power module, for providing power supply for described sampling module, described analog-to-digital conversion module, described processing module.
The present invention also provides a kind of photovoltaic generating system, and comprise photovoltaic array, combining inverter, user side and aforesaid photovoltaic module monitoring device, described photovoltaic array is made up of described photovoltaic module.
The present invention also provides a kind of photovoltaic module monitoring method, comprising:
Sampling module is adopted to gather the characteristic parameter of described photovoltaic module;
Adopt analog-to-digital conversion module to carry out analog-to-digital conversion to described characteristic parameter, the analog signal of described characteristic parameter is converted to digital signal;
Adopt processing module to process described digital signal, and result is exported;
Employing power module is described sampling module, described analog-to-digital conversion module, described processing module provide power supply.
In the present invention, gathered the characteristic parameter of photovoltaic module by sampling module after, by analog-to-digital conversion module, analog-to-digital conversion is carried out to characteristic parameter, the analog signal of characteristic parameter is converted to digital signal, then processing module processes digital signal, and result is exported, simultaneously power module is sampling module, analog-to-digital conversion module, processing module provide power supply.Like this, by the process to photovoltaic module characteristic parameter, this result can represent the operating state of photovoltaic module, then result is exported, realizes the real-time monitoring to photovoltaic module operating state with this.Particularly, by the different operating state of photovoltaic module, the desirable maximum power point of whole photovoltaic array can be obtained, and staff can also find the photovoltaic module of the problem of breaking down rapidly according to the result exported, make a response in time, take measures, improve the generating efficiency of photovoltaic array.
Accompanying drawing explanation
Fig. 1 is the structural representation of photovoltaic module monitoring device embodiment of the present invention;
Fig. 2 is the schematic flow sheet of photovoltaic module monitoring device embodiment of the present invention;
Fig. 3 is the course of work schematic diagram of an example of photovoltaic module monitoring device embodiment of the present invention;
Fig. 4 is the structural representation of photovoltaic generating system first embodiment of the present invention;
Fig. 5 is the first connected mode schematic diagram of photovoltaic module monitoring device 42 and photovoltaic module 411 in photovoltaic generating system first embodiment of the present invention;
Fig. 6 is the second connected mode schematic diagram of photovoltaic module monitoring device 42 and photovoltaic module 411 in photovoltaic generating system first embodiment of the present invention;
Fig. 7 is the example schematic of the second connected mode of photovoltaic module monitoring device 42 and photovoltaic module 411 in photovoltaic generating system first embodiment of the present invention;
Fig. 8 is the structural representation of photovoltaic generating system second embodiment of the present invention;
Fig. 9 is the structural representation of photovoltaic module 811 in photovoltaic generating system second embodiment of the present invention.
Embodiment
Below in conjunction with specification drawings and specific embodiments, the invention will be further described.
As shown in Figure 1, for the structural representation of photovoltaic module monitoring device embodiment of the present invention, this device can comprise: sampling module 11, analog-to-digital conversion module 12, processing module 13 and power module 14, wherein, D/A converter module 12 is connected with sampling module 11, processing module 13 is connected with analog-to-digital conversion module 12, and power module 14 is all connected with sampling module 11, analog-to-digital conversion module 12 and processing module 13.
In the present embodiment, sampling module 11 is for gathering the characteristic parameter of photovoltaic module; The analog signal of characteristic parameter, for carrying out analog-to-digital conversion to characteristic parameter, is converted to digital signal by analog-to-digital conversion module 12; Processing module 13 is for processing digital signal, such as: digital signal to be calculated, compare etc. to process, and result is exported, this result can represent the operating state of photovoltaic module, and processing module 13 specifically can be arranged according to the demand in reality carries out different process to digital signal; Power module 14 is for providing power supply for sampling module 11, analog-to-digital conversion module 12, processing module 13.
The specific works process of the present embodiment is as follows: as shown in Figure 2, is the schematic flow sheet of photovoltaic module monitoring device embodiment of the present invention, specifically can comprises the following steps:
Step 21, employing sampling module 11 gather the characteristic parameter of photovoltaic module;
Step 22, employing analog-to-digital conversion module 12 pairs of characteristic parameters carry out analog-to-digital conversion, and the analog signal of characteristic parameter is converted to digital signal;
Step 23, employing processing module 13 pairs of digital signals process, and result are exported;
Particularly, process such as calculating digital signal, compare can be set according to the demand in reality;
Step 24, employing power module 14 are sampling module 11, analog-to-digital conversion module 12, processing module 13 provide power supply.
In the present embodiment, gathered the characteristic parameter of photovoltaic module by sampling module 11 after, analog-to-digital conversion is carried out by analog-to-digital conversion module 12 pairs of characteristic parameters, the analog signal of characteristic parameter is converted to digital signal, then processing module 13 pairs of digital signals process, and result is exported, simultaneously power module 14 is sampling module 11, analog-to-digital conversion module 12, processing module 13 provide power supply.Like this, by the process to photovoltaic module characteristic parameter, this result can represent the operating state of photovoltaic module, then result is exported, realizes the real-time monitoring to photovoltaic module operating state with this.Particularly, by the different operating state of photovoltaic module, the desirable maximum power point of whole photovoltaic array can be obtained, and staff can also find the photovoltaic module of the problem of breaking down rapidly according to the result exported, make a response in time, take measures, improve the generating efficiency of photovoltaic array.
Alternatively, then structural representation shown in Figure 1, processing module 13 specifically can comprise computing unit 131 and output unit 133, and output unit 133 is connected with computing unit 131.Computing unit 131, for calculating the data of digital signal, particularly, can be averaging, ask the calculating such as maximin the data of digital signal; Output unit 133 is for exporting the result of calculation of computing unit 131.By calculating the data of digital signal, obtain the specifying information of the characterisitic parameter of photovoltaic module, then result exported by output unit 133, this result can represent the operating state of photovoltaic module, can also as the basis for estimation whether normally worked to photovoltaic module.Such as, in real work, the result that staff can export according to output unit 133, makes corresponding process in time to the operating state of photovoltaic module; Or can also software determining program be passed through, the specifying information of automatic acquisition photovoltaic module or carry out automatic decision, perform associative operation.
Alternatively, then structural representation shown in Figure 1, processing module 13 can also comprise comparing unit 132 on the basis of above-mentioned computing unit 131 and output unit 133, and comparing unit 132 is connected between computing unit 131 and output unit 133.Comparing unit 132 is for comparing the result of calculation of computing unit 131 and predetermined threshold; Output unit 133 is also for exporting the comparative result of comparing unit 132.Similarly, the comparative result that output unit 133 exports can represent the operating state of photovoltaic module, can also as the basis for estimation whether normally worked to photovoltaic module.
Alternatively, in the present embodiment, characteristic parameter is specifically as follows operating voltage, the electric current or temperature etc. of photovoltaic module.One or several combination in the characteristic parameter such as operating voltage, electric current, temperature of no matter photovoltaic module, can characterize the operating state of photovoltaic module, in reality, can obtain different characteristic parameters as required by sampling module 11.
Alternatively, in the present embodiment, output unit 133 can adopt wired mode to export the result of calculation of computing unit 131, or output unit 133 can adopt wired mode to export the comparative result of comparing unit 132.Particularly, wired mode can be the mode, serial ports connected mode etc. of power line carrier communication, and wherein serial ports connected mode can comprise RS-232, RS-485 etc.
Alternatively, in the present embodiment, output unit 133 can also adopt wireless mode to export the result of calculation of computing unit 131, or output unit 133 can also adopt wireless mode to export the comparative result of comparing unit 132.Particularly, wireless mode can send above-mentioned result of calculation or comparative result by adopting ZigBee wireless protocols.
Alternatively, in the present embodiment, power module 14 can receive the output of photovoltaic module, is exported by the direct current of photovoltaic module as input, for each module in whole photovoltaic module monitoring device, unit provide power supply.Or, power module 14 except using the output of photovoltaic module as input except, can also be connected with externally fed power supply, using externally fed power supply as input, power module 14 by the power supply of outside input for each module in whole photovoltaic module monitoring device, unit provide power supply.But the output that power module 14 receives photovoltaic module is more convenient as input, this is because photovoltaic module monitoring device is connected with photovoltaic module, is directly powered by photovoltaic module, need not connect externally fed power supply again, easy to use.In addition, the output voltage of photovoltaic module derives from solar energy, more energy-saving and environmental protection.
As shown in Figure 3, for the course of work schematic diagram of an example of photovoltaic module monitoring device embodiment of the present invention, in this example, the characteristic parameter of photovoltaic module is specially the operating voltage of photovoltaic module, and processing module 13 specifically comprises computing unit 131, comparing unit 132 and output unit 133.Specifically can comprise the following steps:
Step 31, solar radiation, solar energy is converted to electric energy by photovoltaic module;
Step 32, power module 14 judge whether voltage that photovoltaic module exports reaches the operating voltage of photovoltaic module monitoring device, if so, then perform step 33, return this step and continue to judge;
Step 33, photovoltaic module monitoring device start monitoring according to default start-up mode;
Alternatively, default start-up mode is specifically as follows: by timer timing, according to the time of presetting, starts working after reaching Preset Time, and with the time of presetting for the cycle, circulation performs monitoring; Setting program instruction, the order of photovoltaic module monitoring device indicated by program command, performs monitoring;
Alternatively, default start-up mode can also start the mode of monitoring for other any photovoltaic module monitoring devices that make, but it is no matter any, all to make photovoltaic module monitoring device start monitoring pattern, obtain monitoring result and export, being convenient to the operating state understanding photovoltaic module in time;
Step 34, sampling module 11 gather the operating voltage of photovoltaic module;
The operating voltage of step 35, analog-to-digital conversion module 12 pairs of photovoltaic modulies carries out analog-to-digital conversion, and the analog signal of this operating voltage is converted to digital signal;
The data of step 36, computing unit 131 pairs of digital signals calculate, result of calculation and predetermined threshold compare by comparing unit 132, output unit 133 adopts wireless mode to export this comparative result, then returns step 33, treats that photovoltaic module monitoring device starts monitoring next time.
As shown in Figure 4, for the structural representation of photovoltaic generating system first embodiment of the present invention, this photovoltaic generating system can comprise photovoltaic array 41, photovoltaic module monitoring device 42, combining inverter 43 and user side 44, photovoltaic module monitoring device 42 is connected with photovoltaic array 41, combining inverter 43 is connected with photovoltaic module monitoring device 42, and user side 44 is connected with combining inverter 43.Wherein, photovoltaic array 41 is made up of photovoltaic module, and here, the number of photovoltaic module can be determined according to the scale of the photovoltaic generating system of reality, then photovoltaic module monitoring device 42 specifically can be connected with photovoltaic module.Photovoltaic module monitoring device 42 comprises arbitrary module in aforesaid photovoltaic module monitoring device embodiment and unit, does not repeat them here; Photovoltaic module monitoring device 42 pairs of photovoltaic modulies are monitored, and specifically can monitor the operating state of photovoltaic module; Combining inverter 43 obtains the maximum power point of photovoltaic array according to the monitoring result of photovoltaic module monitoring device 42, and be that alternating current is input in electrical network for user side 44 by DC conversion, can ensure that photovoltaic array is operated in maximum power point like this, thus improve the generating efficiency of photovoltaic array.
Schematic diagram shown in Figure 4 again, can be described for the photovoltaic module of in photovoltaic array 41 411, other photovoltaic modulies therewith photovoltaic module 411 are all identical, then photovoltaic module monitoring device 42 is connected with photovoltaic module 411.
Alternatively, as shown in Figure 5, be photovoltaic module monitoring device in photovoltaic generating system first embodiment of the present invention 42 and the first connected mode schematic diagram of photovoltaic module 411, in this schematic diagram, photovoltaic module 411 comprises terminal box 51, and photovoltaic module monitoring device 42 is connected with terminal box 51.Particularly, photovoltaic module monitoring device 42 can be connected by connector with terminal box 51.
Alternatively, as shown in Figure 6, for photovoltaic module monitoring device in photovoltaic generating system first embodiment of the present invention 42 and the second connected mode schematic diagram of photovoltaic module 411, be with the difference of upper a kind of connected mode, in this schematic diagram, also comprise connector 61, photovoltaic module monitoring device 42 can be connected by connector 61 with terminal box 51.Connector 61 can comprise expansion end, for expanding connection, can realize multiple photovoltaic module and connecting together, such as: realize two photovoltaic modulies and be connected in series.Expansion end can be positive pole or negative pole, then schematic diagram shown in Figure 4, supposes that the expansion end of two connectors 61 is respectively side a and b, if A end is positive pole, then B end is negative pole; On the contrary, if A end is negative pole, then B end is positive pole.Alternatively, connector 61 can be connector.
Connector 61 is expanded end and photovoltaic module monitoring device 42 can be made simultaneously to realize monitoring multiple photovoltaic module.Particularly, as shown in Figure 7, be photovoltaic module monitoring device in photovoltaic generating system first embodiment of the present invention 42 and the example schematic of the second connected mode of photovoltaic module 411, in the figure, three photovoltaic modulies are connected in series by connector 61.Particularly, in this schematic diagram, the terminal box 51 of first photovoltaic module is connected with photovoltaic module monitoring device 42 by a connector 61, is connected on first connector 61 corresponding with second photovoltaic module by another connector 61; The terminal box 51 of second photovoltaic module realizes being connected with photovoltaic module monitoring device 42 by aforesaid first connector 61 corresponding with second photovoltaic module, and the terminal box 51 of second photovoltaic module is connected on first connector 61 corresponding with the 3rd photovoltaic module by another connector 61; The terminal box 51 of the 3rd photovoltaic module realizes being connected with photovoltaic module monitoring device 42 by aforesaid first connector 61 corresponding with the 3rd photovoltaic module and another connector 61.Like this, being connected in series of three photovoltaic modulies can be realized, and realize a photovoltaic module monitoring device 42 to three series connection photovoltaic module monitor.
As shown in Figure 8, for the structural representation of photovoltaic generating system second embodiment of the present invention, be with the difference of photovoltaic generating system first embodiment of the present invention, in this embodiment, photovoltaic module monitoring device 42 is arranged in the terminal box of photovoltaic module, photovoltaic array 81 is made up of photovoltaic module, and combining inverter 43 is connected with photovoltaic module.Be described for the photovoltaic module of in photovoltaic array 81 811, other photovoltaic modulies therewith photovoltaic module 811 are all identical, as shown in Figure 9, for the structural representation of photovoltaic module 811 in photovoltaic generating system second embodiment of the present invention, in the figure, photovoltaic module monitoring device 42 is arranged in the terminal box 91 of photovoltaic module 811.Like this, not be used in photovoltaic component system and photovoltaic module monitoring device 42 is set separately, directly photovoltaic module monitoring device 42 is arranged in the terminal box 91 of photovoltaic module 811, obtain a kind of new photovoltaic module 811.
Last it is noted that above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not depart from the spirit and scope of technical solution of the present invention.
Claims (10)
1. a photovoltaic module monitoring device, is characterized in that, comprising:
Sampling module, for gathering the characteristic parameter of described photovoltaic module;
Analog-to-digital conversion module, for carrying out analog-to-digital conversion to described characteristic parameter, is converted to digital signal by the analog signal of described characteristic parameter;
Processing module, for processing described digital signal, and exports result;
Power module, for providing power supply for described sampling module, described analog-to-digital conversion module, described processing module.
2. device according to claim 1, is characterized in that, described processing module comprises:
Computing unit, for calculating the data of described digital signal;
Output unit, for exporting the result of calculation of described computing unit.
3. device according to claim 2, is characterized in that, described processing module also comprises comparing unit, is connected between described computing unit and described output unit, for described result of calculation and predetermined threshold being compared;
Described output unit is also for exporting the comparative result of described comparing unit.
4. the device according to Claims 2 or 3, is characterized in that, described output unit adopts wired mode to export described result of calculation or described comparative result; Or
Described output unit adopts wireless mode to export described result of calculation or described comparative result.
5. a photovoltaic generating system, is characterized in that, comprise the arbitrary described photovoltaic module monitoring device of photovoltaic array, combining inverter, user side and claim 1-4, described photovoltaic array is made up of described photovoltaic module.
6. system according to claim 5, is characterized in that, described photovoltaic module monitoring device is arranged between described photovoltaic module and described combining inverter; Or
Described photovoltaic module monitoring device is arranged in the terminal box of described photovoltaic module.
7. a photovoltaic module monitoring method, is characterized in that, comprising:
Sampling module is adopted to gather the characteristic parameter of described photovoltaic module;
Adopt analog-to-digital conversion module to carry out analog-to-digital conversion to described characteristic parameter, the analog signal of described characteristic parameter is converted to digital signal;
Adopt processing module to process described digital signal, and result is exported;
Employing power module is described sampling module, described analog-to-digital conversion module, described processing module provide power supply.
8. method according to claim 7, is characterized in that, described employing processing module processes described digital signal, and result output is specifically comprised:
The data of described digital signal are calculated;
Export the result of calculation of described computing unit.
9. method according to claim 8, is characterized in that, described employing processing module processes described digital signal, and result output is specifically also comprised:
Described result of calculation and predetermined threshold are compared;
Export the comparative result of described comparing unit.
10. method according to claim 8 or claim 9, it is characterized in that, the result of calculation of the described computing unit of described output is specially:
Adopt wired mode to export described result of calculation or adopt wireless mode to export described result of calculation;
The comparative result of the described comparing unit of described output is specially:
Adopt wired mode to export described comparative result or adopt wireless mode to export described comparative result.
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| CN104038154A (en) * | 2014-06-12 | 2014-09-10 | 北方民族大学 | Automatic detection system for solar photovoltaic array fault and detection method thereof |
| US20150271575A1 (en) * | 2014-03-24 | 2015-09-24 | Sumitomo Electric Industries, Ltd. | Monitoring system for photovoltaic power generation and communication method therefor |
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2015
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102288856A (en) * | 2011-05-16 | 2011-12-21 | 复旦大学 | Photovoltaic polar plate fault damage detection device based on wireless communication and method of same |
| US20150271575A1 (en) * | 2014-03-24 | 2015-09-24 | Sumitomo Electric Industries, Ltd. | Monitoring system for photovoltaic power generation and communication method therefor |
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