CN105429115A - Photovoltaic power generation system, photovoltaic direct current cable protection device and control method thereof - Google Patents
Photovoltaic power generation system, photovoltaic direct current cable protection device and control method thereof Download PDFInfo
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- CN105429115A CN105429115A CN201510923756.8A CN201510923756A CN105429115A CN 105429115 A CN105429115 A CN 105429115A CN 201510923756 A CN201510923756 A CN 201510923756A CN 105429115 A CN105429115 A CN 105429115A
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- 238000000034 method Methods 0.000 title claims abstract description 68
- 238000010248 power generation Methods 0.000 title abstract description 4
- 238000001914 filtration Methods 0.000 claims abstract description 28
- 230000000052 comparative effect Effects 0.000 claims description 24
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 abstract description 7
- 238000004891 communication Methods 0.000 description 9
- 230000005540 biological transmission Effects 0.000 description 6
- 230000001681 protective effect Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 208000033999 Device damage Diseases 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
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- H02J13/0003—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
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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
-
- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
-
- 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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
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- Emergency Protection Circuit Devices (AREA)
- Photovoltaic Devices (AREA)
Abstract
The invention discloses a photovoltaic power generation system, a photovoltaic direct current cable protection device and a control method thereof. The photovoltaic direct current cable protection device comprises a signal acquisition processing module, a control module and a switch module. The signal acquisition processing module is used for collecting electrical signals of a direct current bus and carrying out filtering calibration processing on the electrical signals. The control module is used for comparing the collected electrical signals with a preset signal and outputting a corresponding control signal according to a comparison result. The switch module is used for executing a corresponding switch motion instruction to control open or close of a photovoltaic cell array when the control signal is received. Therefore, photovoltaic cable short circuit fault detection of a non-blind area can be realized; simultaneously, when a short circuit fault is generated, a protection apparatus of photovoltaic group string energy can be reliably cut off and safety of the photovoltaic power generation system is greatly increased.
Description
Technical field
The present invention relates to technical field of photovoltaic power generation, particularly photovoltaic generating system, photovoltaic DC cable protecting device and control method thereof.
Background technology
There is both positive and negative polarity short circuit in photovoltaic plant DC bus (direct current conflux cabinet DC bus, combining inverter DC bus, photovoltaic battery array etc.), when positive pole or negative plate shorted to earth, equipment performance decline, device damage may be caused, cause any property loss and even threaten personal safety.Therefore, be necessary to carry out real-time short trouble detection to photovoltaic plant DC bus, the result according to detecting takes suitable counter-measure, ensures the safety of photovoltaic plant and peripheral equipment.
The fault detect of existing photovoltaic plant direct current cables is by reaching protection object at inverter direct-flow side installing insulating impedance detection device.There are two weak points in this method: first, because header box or DC cabinet have counnter attack diode, detects and there is blind area, absolutely short trouble cannot be detected; Secondly, inverter detects that short trouble appears in direct current cables, if fault point is between header box and inverter, inverter can only disconnect self AC-DC switch, therefore fault cannot be eliminated, at this moment photovoltaic group string continues to short circuit trouble point conveying capacity, finally causes photovoltaic cable to damage, even results in greater loss.
Thus prior art need to improve.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art part; the object of the present invention is to provide photovoltaic generating system, photovoltaic DC cable protecting device and control method thereof; non-blind area photovoltaic cable short trouble can be realized detect; reliably can cut off the protective device of photovoltaic group string energy simultaneously when there is short trouble, substantially increasing the fail safe of photovoltaic generating system.
In order to achieve the above object, this invention takes following technical scheme:
A kind of photovoltaic DC cable protecting device, it comprises:
Signal acquisition process module, for gathering the signal of telecommunication of DC bus, and carries out filtering calibration process to the described signal of telecommunication;
Control module, for being compared with preset signals by the signal of telecommunication of collection, and exports corresponding control signal according to comparative result;
Switch module, for when receiving control signal, performs unlatching or shutoff that corresponding switch motion instruction controls photovoltaic battery array.
In described photovoltaic DC cable protecting device, described signal acquisition process module specifically comprises:
Voltage acquisition processing unit, for gathering the voltage of DC bus, and carries out filtering calibration process to described voltage;
Current acquisition processing unit, for gathering the electric current of DC bus, and carries out filtering calibration process to described electric current.
In described photovoltaic DC cable protecting device, described control module specifically comprises:
First comparing unit, the magnitude of voltage for the DC bus by collection compares with voltage threshold, and output voltage comparative result;
First judges processing unit, for judging whether the magnitude of voltage of the DC bus gathered is less than voltage threshold, is if so, then compared with current threshold by the current value of the DC bus of collection, if not, then again judge whether the magnitude of voltage of the DC bus gathered is less than voltage threshold;
Second comparing unit, the current value for the DC bus by collection compares with current threshold, and output current comparative result;
Second judges processing unit, for judging whether the current value gathering DC bus is greater than current threshold, if so, then exporting cut-off signals to switch module, if not, then again judging whether the magnitude of voltage of the DC bus gathered is less than voltage threshold.
In described photovoltaic DC cable protecting device, described switch module specifically comprises:
Disjunction control unit, for being converted into switch motion instruction when receiving control signal;
Controlled section breaker, for performing corresponding unlatching or shutoff action when receiving described switch motion instruction.
In described photovoltaic DC cable protecting device, described signal acquisition process module also comprises: AD conversion unit, and the signal of telecommunication for the DC bus gathered is converted to digital signal.
A control method for photovoltaic DC cable protecting device as above, it comprises the steps:
A, the signal of telecommunication by signal acquisition process module acquires DC bus, and filtering calibration process is carried out to the described signal of telecommunication;
B, to be compared with preset signals by the signal of telecommunication of control module by collection, and export corresponding control signal according to comparative result;
C, by switch module when receiving control signal, perform corresponding switch motion instruction and control the unlatching of photovoltaic battery array or shutoff.
In the control method of described photovoltaic DC cable protecting device, described steps A specifically comprises:
Gathered the voltage of DC bus by voltage acquisition processing unit, and filtering calibration process is carried out to described voltage;
Gathered the electric current of DC bus by current acquisition processing unit, and filtering calibration process is carried out to described electric current.
In the control method of described photovoltaic DC cable protecting device, described step B specifically comprises:
B1, to be compared with voltage threshold by the magnitude of voltage of the first comparing unit by the DC bus of collection, and output voltage comparative result;
B2, to judge that by first processing unit judges whether the magnitude of voltage of the DC bus gathered is less than voltage threshold, if, then the current value of the DC bus of collection is compared with current threshold, if not, then again judge whether the magnitude of voltage of the DC bus gathered is less than voltage threshold;
B3, to be compared with current threshold by the current value of the second comparing unit by the DC bus of collection, and output current comparative result;
B4, to judge that by second processing unit judges whether the current value gathering DC bus is greater than current threshold, if so, then export cut-off signals to switch module, if not, then again judge whether the magnitude of voltage of the DC bus gathered is less than voltage threshold.
In the control method of described photovoltaic DC cable protecting device, described step C specifically comprises:
Switch motion instruction is converted into when receiving control signal by controlled section breaker;
Corresponding unlatching or shutoff action is performed when receiving described switch motion instruction by controlled section breaker.
A kind of photovoltaic DC cable protection system; comprise photovoltaic battery array, photovoltaic confluence device, direct current collector-shoe gear and photovoltaic DC-to-AC converter; described photovoltaic battery array is electrically connected with direct current collector-shoe gear by photovoltaic confluence device; described direct current collector-shoe gear connects photovoltaic DC-to-AC converter; described photovoltaic DC-to-AC converter connects electrical network; described photovoltaic DC cable protection system also comprises photovoltaic DC cable protecting device as above, the connection photovoltaic confluence device of described photovoltaic DC cable protecting device and electrical network.
Compared to prior art, in photovoltaic generating system provided by the invention, photovoltaic DC cable protecting device and control method thereof, described photovoltaic DC cable protecting device comprises signal acquisition process module, control module and switch module, described signal acquisition process module for gathering the signal of telecommunication of DC bus, and carries out filtering calibration process to the described signal of telecommunication; Described control module is used for the signal of telecommunication of collection to compare with preset signals, and exports corresponding control signal according to comparative result; Described switch module is used for when receiving control signal; perform unlatching or shutoff that corresponding switch motion instruction controls photovoltaic battery array; thus non-blind area photovoltaic cable short trouble detection can be realized; reliably can cut off the protective device of photovoltaic group string energy simultaneously when there is short trouble, substantially increasing the fail safe of photovoltaic generating system.
Accompanying drawing explanation
Fig. 1 is the structural representation of photovoltaic generating system provided by the invention.
Fig. 2 is the structured flowchart of photovoltaic DC cable protecting device provided by the invention.
Fig. 3 is the structured flowchart of signal acquisition process module, control module and switch module in photovoltaic DC cable protecting device provided by the invention.
Fig. 4 is the flow chart of the control method of photovoltaic DC cable protecting device provided by the invention.
Embodiment
In view of in prior art there is blind area in the fault detect of photovoltaic plant direct current cables; absolutely short trouble cannot be detected; and the shortcoming of fault cannot be eliminated from root; the object of the present invention is to provide photovoltaic generating system, photovoltaic DC cable protecting device and control method thereof can realize non-blind area photovoltaic cable short trouble to detect; reliably can cut off the protective device of photovoltaic group string energy simultaneously when there is short trouble, substantially increasing the fail safe of photovoltaic generating system.
For making object of the present invention, technical scheme and effect clearly, clearly, developing simultaneously referring to accompanying drawing, the present invention is described in more detail for embodiment.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Refer to Fig. 1, photovoltaic generating system provided by the invention comprises photovoltaic battery array 10, photovoltaic confluence device 20, direct current collector-shoe gear 30, photovoltaic DC-to-AC converter 40 and photovoltaic DC cable protecting device 50, described photovoltaic battery array 10 is electrically connected with direct current collector-shoe gear 30 by photovoltaic confluence device 20, described direct current collector-shoe gear 30 connects photovoltaic DC-to-AC converter 40, described photovoltaic DC-to-AC converter 40 connects the U end of electrical network, V end and W end, the connection photovoltaic confluence device 20 of described photovoltaic DC cable protecting device 50, the U end of electrical network and N end, described photovoltaic DC cable protecting device 50 is for detecting and processing the short trouble of photovoltaic generating system DC bus.
Particularly, refer to Fig. 2, described photovoltaic DC cable protecting device 50 comprises signal acquisition process module 501, control module 502, switch module 503, communication module 504 and power module 505, described signal acquisition process module 501, switch module 503, communication module 504 and power module 505 be connecting communication module 504 all, wherein, described signal acquisition process module 501 for gathering the signal of telecommunication of DC bus, and carries out filtering calibration process to the described signal of telecommunication, described control module 502 for being compared with preset signals by the signal of telecommunication of collection, and exports corresponding control signal according to comparative result, described switch module 503 is for when receiving control signal, perform unlatching or shutoff that corresponding switch motion instruction controls photovoltaic battery array, thus by gathering the signal of telecommunication of DC bus, after filtering calibration process, the described signal of telecommunication is compared with preset signals, according to the operating state of comparative result Real-time Feedback DC bus, corresponding control signal is exported according to comparative result by control module 502, switch module 503 is when receiving control signal, perform unlatching or shutoff that corresponding switch motion instruction controls photovoltaic battery array, make DC bus when there is short trouble, the Energy transmission of photovoltaic battery array 10 can be cut off in time, avoid damaging photovoltaic cable, improve the fail safe of photovoltaic generating system.
Described power module 505 is connected with electrical network, for providing stable power supply for described photovoltaic DC cable protecting device 50; Described communication module 504 is for transferring to background monitoring equipment by control signal, and be convenient to staff's real-time query and control the operating state of described photovoltaic DC cable protecting device 50, described communication media is RS485, supports modbus communications protocol.
See also Fig. 3, described signal acquisition process module 501 specifically comprises voltage acquisition processing unit 5011 and current acquisition processing unit 5012, described voltage acquisition processing unit 5011 and current acquisition processing unit 5012 all link control modules 502, described voltage acquisition processing unit 5011 for gathering the voltage of DC bus, and carries out filtering calibration process to described voltage; Described current acquisition processing unit 5012 is for gathering the electric current of DC bus, and filtering calibration process is carried out to described electric current, during concrete enforcement, described voltage acquisition processing unit 5011 can adopt resitstance voltage divider or the voltage of Hall voltage transducer to DC bus to accurately measure, described current acquisition processing unit 5012 can adopt divertor or Hall current sensor etc., certainly, described voltage acquisition processing unit 5011 and current acquisition processing unit 5012 all can adopt other to have the device of identical function, and the present invention is not construed as limiting this.
Further, described control module 502 specifically comprises the first comparing unit 5021, second comparing unit 5022, first and judges that processing unit 5023 and second judges processing unit 5024, described first judges that processing unit 5023 connects the first comparing unit 5021 and second and judges processing unit 5024, described first comparing unit 5021 also connects voltage acquisition processing unit 5011, described second judges that processing unit 5024 connects the second comparing unit 5022 and switch module 503, and described second comparing unit 5022 also connects current acquisition processing unit 5012.
Described first comparing unit 5021 compares with voltage threshold for the magnitude of voltage of the DC bus by collection, and output voltage comparative result; Described second comparing unit 5022 compares with current threshold for the current value of the DC bus by collection, and output current comparative result; Described first judges that processing unit 5023 is for judging whether the magnitude of voltage of the DC bus gathered is less than voltage threshold, if, then the current value of the DC bus of collection is compared with current threshold, if not, then again judge whether the magnitude of voltage of the DC bus gathered is less than voltage threshold; Described second judges that processing unit 5024 is for judging whether the current value gathering DC bus is greater than current threshold, if so, then exports cut-off signals to switch module 503, if not, then again judges whether the magnitude of voltage of the DC bus gathered is less than voltage threshold.Wherein, described voltage threshold and current threshold, by software set, can adjust according to concrete photovoltaic battery array 10 characteristic and installation needs, convenient and swift.
During concrete enforcement, the voltage of the DC bus calibrated after process through filtering is exported to first comparing unit 5021 by voltage acquisition processing unit 5011, simultaneously, the electric current of the DC bus calibrated after process through filtering is exported to second comparing unit 5022 by current acquisition processing unit 5012, the magnitude of voltage of the DC bus of collection compares with voltage threshold by the first comparing unit 5021, when the magnitude of voltage of the DC bus gathered is greater than voltage threshold, then continue to judge that processing unit 5023 judges whether the magnitude of voltage of the DC bus gathered is less than voltage threshold by first; When the magnitude of voltage of the DC bus gathered is less than voltage threshold, then by the second comparing unit 5022, the current value of the DC bus of collection is compared with voltage flow valuve; When the current value of the DC bus gathered is less than current threshold, then again judge that processing unit 5023 judges whether the magnitude of voltage of the DC bus gathered is less than voltage threshold by first; When the current value of the DC bus gathered is greater than current threshold, then judge that processing unit 5024 exports cut-off signals to switch module 503 by second, cut off the Energy transmission of photovoltaic battery array 10.
Namely when the magnitude of voltage of the DC bus gathered is less than voltage threshold, and the current value of DC bus gathered is when being greater than current threshold, control module 502 exports cut-off signals to switch module 503, control photovoltaic battery array 10 to stop exporting energy, effectively prevent the electrical fire because short circuit causes, and the short trouble detection of non-blind area can be realized by the magnitude of voltage and current value gathering DC bus, substantially increase the fail safe of photovoltaic generating system.
Further; described signal acquisition process module 501 also comprises AD conversion unit (not shown); described AD conversion unit is connected with voltage acquisition processing unit 5011 and current acquisition processing unit 5012; digital signal is converted to for the voltage signal of the DC bus by collection and current signal; the comparison of voltage and electric current is carried out again after filtering calibration process; improve the environment anti-interference of signal, make described photovoltaic DC cable protecting device 50 can detect the short trouble of DC bus more accurately and carry out respective handling.
Please continue to refer to Fig. 3, described switch module 503 specifically comprises disjunction control unit 5031 and controlled section breaker 5032, described controlled section breaker 5032 is connected with disjunction control unit 5031, described disjunction control unit 5031 and second judges that processing unit 5024 is connected, wherein, described disjunction control unit 5031 is for being converted into switch motion instruction when receiving control signal; Described controlled section breaker 5032 is for performing corresponding unlatching or shutoff action when receiving described switch motion instruction.During concrete enforcement, when the magnitude of voltage of the DC bus gathered is less than voltage threshold, and the current value of DC bus gathered is when being greater than current threshold, control module 502 exports cut-off signals to disjunction control unit 5031, described disjunction control unit 5031 receives described cut-off signals and is converted into shutoff action command, described controlled section breaker 5032 performs when receiving and turning off action command and turns off the Energy transmission that action disconnects photovoltaic battery array 10, particularly, described disjunction control unit 5031 can adopt relay or semiconductor switch, certainly other also can be adopted to have the device of identical function, the present invention is not construed as limiting this.
The present invention is also corresponding provides a kind of photovoltaic DC cable protecting device, owing to being described in detail described photovoltaic DC cable protecting device above, is not described further herein.
The present invention is the corresponding control method providing a kind of photovoltaic DC cable protecting device also, and as shown in Figure 4, the control method of described photovoltaic DC cable protecting device comprises the steps:
S100, the signal of telecommunication by signal acquisition process module acquires DC bus, and filtering calibration process is carried out to the described signal of telecommunication;
S200, to be compared with preset signals by the signal of telecommunication of control module by collection, and export corresponding control signal according to comparative result;
S300, by switch module when receiving control signal, perform corresponding switch motion instruction and control the unlatching of photovoltaic battery array or shutoff.
The control method of photovoltaic DC cable protecting device provided by the invention is by gathering the signal of telecommunication of DC bus, after filtering calibration process, the described signal of telecommunication is compared with preset signals, according to the operating state of comparative result Real-time Feedback DC bus, corresponding control signal is exported according to comparative result by control module, switch module is when receiving control signal, perform unlatching or shutoff that corresponding switch motion instruction controls photovoltaic battery array, make DC bus when there is short trouble, the Energy transmission of photovoltaic battery array can be cut off in time, avoid damaging photovoltaic cable, improve the fail safe of photovoltaic generating system.
Further; the control method of described photovoltaic DC cable protecting device also comprises, by communication module, control signal is transferred to background monitoring equipment; be convenient to staff's real-time query and control the operating state of described photovoltaic DC cable protecting device; described communication media is RS485, supports modbus communications protocol.
Particularly, described step S100 comprises: the voltage being gathered DC bus by voltage acquisition processing unit, and carries out filtering calibration process to described voltage; And the electric current of DC bus is gathered by current acquisition processing unit, and filtering calibration process is carried out to described electric current, during concrete enforcement, described voltage acquisition processing unit can adopt resitstance voltage divider or the voltage of Hall voltage transducer to DC bus to accurately measure, described current acquisition processing unit can adopt divertor or Hall current sensor etc., certainly, described voltage acquisition processing unit and current acquisition processing unit all can adopt other to have the device of identical function, and the present invention is not construed as limiting this.
Further, described step S200 specifically comprises: compared with voltage threshold by the magnitude of voltage of the first comparing unit by the DC bus of collection, and output voltage comparative result; Judge that processing unit judges whether the magnitude of voltage of the DC bus gathered is less than voltage threshold by first, if, then the current value of the DC bus of collection is compared with current threshold, if not, then again judge whether the magnitude of voltage of the DC bus gathered is less than voltage threshold; Compared with current threshold by the current value of the second comparing unit by the DC bus of collection afterwards, and output current comparative result; Judge that processing unit judges whether the current value gathering DC bus is greater than current threshold by second, if so, then export cut-off signals to switch module, if not, then again judge whether the magnitude of voltage of the DC bus gathered is less than voltage threshold.Wherein, described voltage threshold and current threshold, by software set, can adjust according to concrete photovoltaic battery array characteristic and installation needs, convenient and swift.
During concrete enforcement, the voltage of the DC bus calibrated after process through filtering is exported to first comparing unit by voltage acquisition processing unit, simultaneously, the electric current of the DC bus calibrated after process through filtering is exported to second comparing unit by current acquisition processing unit, the magnitude of voltage of the DC bus of collection compares with voltage threshold by the first comparing unit, when the magnitude of voltage of the DC bus gathered is greater than voltage threshold, then continue to judge that processing unit judges whether the magnitude of voltage of the DC bus gathered is less than voltage threshold by first; When the magnitude of voltage of the DC bus gathered is less than voltage threshold, then by the second comparing unit, the current value of the DC bus of collection is compared with voltage flow valuve; When the current value of the DC bus gathered is less than current threshold, then again judge that processing unit judges whether the magnitude of voltage of the DC bus gathered is less than voltage threshold by first; When the current value of the DC bus gathered is greater than current threshold, then judges that processing unit exports cut-off signals to switch module by second, cut off the Energy transmission of photovoltaic battery array.
Namely when the magnitude of voltage of the DC bus gathered is less than voltage threshold, and the current value of DC bus gathered is when being greater than current threshold, control module exports cut-off signals to switch module, control photovoltaic battery array to stop exporting energy, effectively prevent the electrical fire because short circuit causes, and the short trouble detection of non-blind area can be realized by the magnitude of voltage and current value gathering DC bus, substantially increase the fail safe of photovoltaic generating system.
Further, described step S300 comprises: be converted into switch motion instruction when receiving control signal by controlled section breaker; Corresponding unlatching or shutoff action is performed when receiving described switch motion instruction afterwards by controlled section breaker.During concrete enforcement, when the magnitude of voltage of the DC bus gathered is less than voltage threshold, and the current value of DC bus gathered is when being greater than current threshold, control module exports cut-off signals to disjunction control unit, described disjunction control unit receives described cut-off signals and is converted into shutoff action command, described controlled section breaker performs when receiving and turning off action command and turns off the Energy transmission that action disconnects photovoltaic battery array, particularly, described disjunction control unit can adopt relay or semiconductor switch, certainly other also can be adopted to have the device of identical function, the present invention is not construed as limiting this.
In sum, in photovoltaic generating system provided by the invention, photovoltaic DC cable protecting device and control method thereof, described photovoltaic DC cable protecting device comprises signal acquisition process module, control module and switch module, described signal acquisition process module for gathering the signal of telecommunication of DC bus, and carries out filtering calibration process to the described signal of telecommunication; Described control module is used for the signal of telecommunication of collection to compare with preset signals, and exports corresponding control signal according to comparative result; Described switch module is used for when receiving control signal; perform unlatching or shutoff that corresponding switch motion instruction controls photovoltaic battery array; thus non-blind area photovoltaic cable short trouble detection can be realized; reliably can cut off the protective device of photovoltaic group string energy simultaneously when there is short trouble, substantially increasing the fail safe of photovoltaic generating system.
Be understandable that, for those of ordinary skills, can be equal to according to technical scheme of the present invention and inventive concept thereof and replace or change, and all these change or replace the protection range that all should belong to the claim appended by the present invention.
Claims (10)
1. a photovoltaic DC cable protecting device, is characterized in that, comprising:
Signal acquisition process module, for gathering the signal of telecommunication of DC bus, and carries out filtering calibration process to the described signal of telecommunication;
Control module, for being compared with preset signals by the signal of telecommunication of collection, and exports corresponding control signal according to comparative result;
Switch module, for when receiving control signal, performs unlatching or shutoff that corresponding switch motion instruction controls photovoltaic battery array.
2. photovoltaic DC cable protecting device according to claim 1, is characterized in that, described signal acquisition process module specifically comprises:
Voltage acquisition processing unit, for gathering the voltage of DC bus, and carries out filtering calibration process to described voltage;
Current acquisition processing unit, for gathering the electric current of DC bus, and carries out filtering calibration process to described electric current.
3. photovoltaic DC cable protecting device according to claim 2, is characterized in that, described control module specifically comprises:
First comparing unit, the magnitude of voltage for the DC bus by collection compares with voltage threshold, and output voltage comparative result;
First judges processing unit, for judging whether the magnitude of voltage of the DC bus gathered is less than voltage threshold, is if so, then compared with current threshold by the current value of the DC bus of collection, if not, then again judge whether the magnitude of voltage of the DC bus gathered is less than voltage threshold;
Second comparing unit, the current value for the DC bus by collection compares with current threshold, and output current comparative result;
Second judges processing unit, for judging whether the current value gathering DC bus is greater than current threshold, if so, then exporting cut-off signals to switch module, if not, then again judging whether the magnitude of voltage of the DC bus gathered is less than voltage threshold.
4. photovoltaic DC cable protecting device according to claim 1, is characterized in that, described switch module specifically comprises:
Disjunction control unit, for being converted into switch motion instruction when receiving control signal;
Controlled section breaker, for performing corresponding unlatching or shutoff action when receiving described switch motion instruction.
5. photovoltaic DC cable protecting device according to claim 1, is characterized in that, described signal acquisition process module also comprises: AD conversion unit, and the signal of telecommunication for the DC bus by collection is converted to digital signal.
6. a control method for photovoltaic DC cable protecting device as claimed in claim 1, is characterized in that, comprise the steps:
A, the signal of telecommunication by signal acquisition process module acquires DC bus, and filtering calibration process is carried out to the described signal of telecommunication;
B, to be compared with preset signals by the signal of telecommunication of control module by collection, and export corresponding control signal according to comparative result;
C, by switch module when receiving control signal, perform corresponding switch motion instruction and control the unlatching of photovoltaic battery array or shutoff.
7. the control method of photovoltaic DC cable protecting device according to claim 6, is characterized in that, described steps A specifically comprises:
Gathered the voltage of DC bus by voltage acquisition processing unit, and filtering calibration process is carried out to described voltage;
Gathered the electric current of DC bus by current acquisition processing unit, and filtering calibration process is carried out to described electric current.
8. the control method of photovoltaic DC cable protecting device according to claim 7, is characterized in that, described step B specifically comprises:
B1, to be compared with voltage threshold by the magnitude of voltage of the first comparing unit by the DC bus of collection, and output voltage comparative result; B2, to judge that by first processing unit judges whether the magnitude of voltage of the DC bus gathered is less than voltage threshold, if so, then perform step B3, if not, then again judge whether the magnitude of voltage of the DC bus gathered is less than voltage threshold;
B3, to be compared with current threshold by the current value of the second comparing unit by the DC bus of collection, and output current comparative result; B4, to judge that by second processing unit judges whether the current value gathering DC bus is greater than current threshold, if so, then export cut-off signals to switch module, if not, then again judge whether the magnitude of voltage of the DC bus gathered is less than voltage threshold.
9. the control method of photovoltaic DC cable protecting device according to claim 6, is characterized in that, described step C specifically comprises:
Switch motion instruction is converted into when receiving control signal by controlled section breaker;
Corresponding unlatching or shutoff action is performed when receiving described switch motion instruction by controlled section breaker.
10. a photovoltaic generating system; comprise photovoltaic battery array, photovoltaic confluence device, direct current collector-shoe gear and photovoltaic DC-to-AC converter; described photovoltaic battery array is electrically connected with direct current collector-shoe gear by photovoltaic confluence device; described direct current collector-shoe gear connects photovoltaic DC-to-AC converter; described photovoltaic DC-to-AC converter connects electrical network; it is characterized in that; described photovoltaic DC cable protection system also comprises the photovoltaic DC cable protecting device as described in claim 1-5 any one, the connection photovoltaic confluence device of described photovoltaic DC cable protecting device and electrical network.
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Application publication date: 20160323 |