CN204652310U - A kind of photovoltaic combiner box possessing photovoltaic DC side short-circuit protection and monitoring - Google Patents
A kind of photovoltaic combiner box possessing photovoltaic DC side short-circuit protection and monitoring Download PDFInfo
- Publication number
- CN204652310U CN204652310U CN201520380305.XU CN201520380305U CN204652310U CN 204652310 U CN204652310 U CN 204652310U CN 201520380305 U CN201520380305 U CN 201520380305U CN 204652310 U CN204652310 U CN 204652310U
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- circuit breaker
- photovoltaic
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- short
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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
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- Protection Of Static Devices (AREA)
Abstract
The utility model discloses a kind of photovoltaic combiner box possessing photovoltaic DC side short-circuit protection and monitoring; comprise on each branch road and all fuse is installed; after the fuse of each branch road of positive pole, diode is installed; and the bus-bar that multiple branch circuit positive and negative electrode confluxes; this header box also comprises lightning protection device, circuit breaker and protective device, the positive and negative electrode after confluxing is installed successively described lightning protection device, described protective device and circuit breaker.The utility model is integrated with photovoltaic DC short-circuit protection function on the basis of traditional header box; solve traditional header box can not excise fault in time problem when line short; it is different from the protection philosophy of general mold cased circuit breaker; what adopt is that transducer detects and automatic control technology; real-time sampling is carried out by the voltage to protection circuit, current value; and sampled data is compared computing; in conjunction with the I-V characteristic curve of photovoltaic module; accurate discrimination short trouble; act on circuit breaker trip rapidly; there is high reliability, highly sensitive characteristic.
Description
Technical field
The utility model relates to photovoltaic combiner box technical field, is specifically related to a kind of photovoltaic combiner box possessing photovoltaic DC side short-circuit protection and monitoring.
Background technology
Along with the quick growth of photovoltaic generation application, application scale and scope constantly expand, particularly the utilization of building roof distributed power generation, and its adjoint electric disaster hidden-trouble constitutes safely huge threat to structural fire protection.The photovoltaic combiner box of general traditional form on the market has inborn deficiency in photovoltaic DC short-circuit protection; it is based on the circuit breaker of conventional electrical protection philosophy design selection; when short trouble appears in circuit, can not thread off in time, basic akinesia in a lot of situation.Because; photovoltaic system direct current component is in actual motion; its operating current and short-circuit current value close; the two also can change according to illumination condition and ambient temperature; the sensitivity of normal circuit breaker cannot distinguish operating state when normal and short circuit; protection definite value is difficult to adjust, and does not reach the instantaneous trip value of circuit breaker during line short.And the heat dropout protection of circuit breaker and fuse has the characteristic of inverse time lag; though its in design principle can protection circuit in order to avoid the damage that causes circuit of thermal effect that produces of overcurrent; but in actual motion; the serious fire of photovoltaic plant is how next on fire as the short circuit arcing of cable, and the direct-current arc that short dot occurs can by uncontrollable for fault spread situation before the dropout of protection device heat is not operating.So, for the route protection of photovoltaic system DC side, the ability of accurate distinguish short-circuit fault must be possessed, and can instantaneous excision short trouble.
Utility model content
The purpose of this utility model is for the deficiencies in the prior art; a kind of photovoltaic combiner box possessing photovoltaic DC side short-circuit protection and monitoring is proposed; solve traditional header box can not excise fault in time problem when line short; this photovoltaic combiner box is linked to be by physical unit and circuit configurations, constructs perfect hardware platform for realizing short-circuit protection.
For achieving the above object, the utility model have employed following technical scheme:
A kind of photovoltaic combiner box possessing photovoltaic DC side short-circuit protection and monitoring, comprise on each branch road and all fuse is installed, after the fuse of each branch road of described positive pole, diode is installed, and the bus-bar that multiple branch circuit positive and negative electrode confluxes, this header box also comprises lightning protection device, circuit breaker and protective device, the positive and negative electrode after confluxing is installed successively described lightning protection device, described protective device and circuit breaker;
Described protective device comprises current collecting device and voltage collecting device, described current collecting device is arranged on the bus of described circuit breaker, for gathering the current value of described circuit breaker front end direct current bus, described voltage collecting device is arranged between the positive and negative electrode of described circuit breaker, for gathering the magnitude of voltage between the circuit positive and negative electrode of described circuit breaker front end, the output connection control device respectively of described current collecting device and described voltage collecting device, the output of described controller connects the shunt opening coil of described circuit breaker for controlling described breaker actuation;
This short-circuit protection also comprises power module, and described power module accesses the end of incoming cables of described circuit breaker.
The utility model can also be realized further by following steps
Preferably; described current collecting device is be arranged at the current sensor on described circuit breaker front end direct current bus; described voltage collecting device be arranged at described circuit breaker positive and negative electrode between voltage converter; the output of described current sensor is connected described controller respectively with the output of described voltage converter; this short-circuit protection also comprises power module, and described power module accesses the end of incoming cables of described circuit breaker.
Further, this protective device also comprises temperature sensor, lightning protection device switching value and auxiliary contacts of circuit breaker, described temperature sensor is arranged in header box, the output of described temperature sensor connects described controller, described lightning protection device switching value connects described controller, for gathering lightning protection device state, transfer in controller; Described auxiliary contacts of circuit breaker connects described controller, for gathering circuit-breaker status, transfers in controller.
Further, this protective device also comprises man-machine interface and Control Room, described controller connect man-machine interface and Control Room respectively by communication interface.
The beneficial effects of the utility model are:
1) the utility model is integrated with photovoltaic DC short-circuit protection function on the basis of traditional header box, solve traditional header box can not excise fault in time problem when line short, it is different from the protection philosophy of general mold cased circuit breaker, what adopt is that transducer detects and automatic control technology, by the voltage to protection circuit, current value carries out real-time sampling, and sampled data is sent into microprocessor compare computing, in conjunction with the I-V characteristic curve of photovoltaic module, accurate discrimination short trouble, act on circuit breaker trip rapidly, there is high reliability, highly sensitive characteristic.
2) the utility model is integrated with remote monitoring and the long-range separating brake function of circuit breaker on the basis of traditional header box, can in real time at remote monitoring header box environment temperature, lightning protection device and circuit-breaker status, be convenient to the operation conditions understanding photovoltaic plant in time, can long-range sub-switching operation be carried out if desired.The utility model adopts modularized design, is convenient to later maintenance and replacing, facilitates Function Extension simultaneously.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the utility model electrical schematic diagram.
Fig. 2 is structured flowchart of the present utility model.
1---bus-bar 2---fuse 3---diode 4---lightning protection device 5---temperature sensor 6---auxiliary contacts of circuit breaker
11---circuit breaker 12---current sensor 13---voltage transmitter 14---controller 15---man-machine interface 16---Control Room 17---power modules.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
With reference to Fig. 1, a kind of photovoltaic combiner box possessing photovoltaic DC side short-circuit protection and monitoring, comprise on each branch road and fuse 2 is all installed, after the fuse 2 of each branch road of described positive pole, diode 3 is installed, and the bus-bar 1 that multiple branch circuit positive and negative electrode confluxes, this header box also comprises lightning protection device 4, circuit breaker 11 and protective device, the positive and negative electrode after confluxing is installed successively described lightning protection device 4, described protective device and circuit breaker 11;
The bus of described circuit breaker 11 is provided with the current sensor 12 of the current value for gathering described circuit breaker 11 front end direct current bus, described circuit breaker 11 just, be connected with for just gathering described circuit breaker 11 front end circuit between negative pole, the voltage converter 13 of the magnitude of voltage between negative pole, described current sensor 12 and described voltage converter 13 connection control device 14 respectively, the output of described controller 14 connects the shunt opening coil of described circuit breaker 11 for controlling the action of described circuit breaker 11, this protective device 10 also comprises power module 17, described power module 17 accesses the end of incoming cables of described circuit breaker 11,
Wherein current sensor 12 is Hall current sensor, and circuit breaker 11 is QF photovoltaic DC short-circuiting device.
This short-circuit protection also comprises power module 17, and described power module 17 accesses the end of incoming cables of described circuit breaker 11;
This protective device also comprises temperature sensor 5, lightning protection device switching value 6 and auxiliary contacts of circuit breaker 7, described temperature sensor 5 is arranged in header box, the output of described temperature sensor 5 connects described controller 14, described lightning protection device switching value 6 connects described controller 14, for gathering lightning protection device state, transfer in controller 14; Described auxiliary contacts of circuit breaker 7 connects described controller 14, for gathering circuit breaker 14 state, transfers in controller 14;
This protective device also comprises man-machine interface 15 and Control Room 16, described controller 14 connect man-machine interface 15 and Control Room 16 respectively by communication interface.
Controller in the utility model is only the hardware platform being linked together by circuit configurations by physical unit and form.In use; this controller can coordinate dc-side short-circuit to protect with software of the prior art and monitor; but it must be noted that: the software matched with this controller is not innovative part of the present utility model, neither part of the present utility model.
The function and efficacy of each physical unit in the utility model is described below in conjunction with software:
For the 500KW grade photovoltaic combining inverter that large-sized photovoltaic power station uses, its MPPT voltage range is 460V-850V, minimum starting resistor is generally at about 460V, standby mode is entered lower than this value inverter, photovoltaic DC side switches to open-circuit condition, and the electric current that at this moment this section of circuit flows through is zero.If there is positive and negative electrode direct short-circuit in circuit, during short dot momentary connection, the voltage at circuit two ends can drop to zero, and when there is discharging gap, the voltage at circuit two ends can fluctuate along with gap length, its value generally maintains tens volts, much smaller than the minimum starting resistor of inverter.The voltage value upper limit judged for short-circuit condition can be set to the half of assembly maximum power point voltage Vmp under standard test condition, as DC side adopts 260Wp polysilicon members, Vmp=30.77 under standard test environment, every 21 piece of one series connection of photovoltaic module, so short-circuit condition judge institute must set upper voltage limit value U
0for 323V, both avoided DC voltage interval value when inverter normally works, the change of magnitude of voltage under various short circuit condition can have been tackled again.On The Current Value interval be not less than photovoltaic DC rear flank end connect inverter or controller standby time photovoltaic direct current supply lowest high-current value, consider the certainty of measurement impact of Hall direct current transducer simultaneously, can set current value is 1A, if the current value detected is greater than 1A, magnitude of voltage is less than 323V, the two meets simultaneously, then can judge that short circuit appears in photovoltaic DC side.
First, according to I-V characteristic curve, the setting current value I in controller 14 is set by man-machine interface 15
0with setting voltage value U
0, setting voltage value U
0for 323V, setting current value I
0for 1A;
Secondly, the current value I on current sensor 12 Real-time Collection circuit breaker 11 bus
1, the magnitude of voltage U of voltage transmitter 13 Real-time Collection circuit breaker 11 front end positive and negative electrode
1, by current value I
1with magnitude of voltage U
1send into controller 14; Simultaneously, temperature sensor 5 is monitoring header box environment temperature in real time, lightning protection device switching value 6 Real-time Collection lightning protection device state, auxiliary contacts of circuit breaker 7 Real-time Collection gathers circuit breaker 14 state, and transfers in controller 14 by temperature, lightning protection device state and circuit-breaker status;
Again, controller 14 judges current value I
1whether be greater than the setting current value I defaulted in controller 14
0, magnitude of voltage U
1whether be less than the setting voltage value U defaulted in controller 14
0;
Secondly, the current value I on current sensor Real-time Collection circuit breaker 11 bus
1, the magnitude of voltage U of voltage transmitter Real-time Collection circuit breaker 11 front end positive and negative electrode
1, and according to sampling interval duration t by current value I
1with magnitude of voltage U
1send into controller 14, meanwhile, temperature sensor 5 is monitoring header box environment temperature in real time, lightning protection device switching value 6 Real-time Collection lightning protection device state, auxiliary contacts of circuit breaker 7 Real-time Collection circuit breaker 14 state, and by current value I
1with magnitude of voltage U
1, temperature, lightning protection device state and circuit-breaker status transfer in controller 14; Temperature, lightning protection device state and circuit-breaker status transfer in Control Room 16 by controller 14, can realize the long-range sub-switching operation to circuit breaker;
Finally, if the current value I of current collecting device collection
1be greater than setting current value I
0, the magnitude of voltage U of voltage collecting device collection simultaneously
1be less than setting voltage value U
0, then occur short trouble between the positive and negative electrode that controller 14 detects photovoltaic DC side, controller 14 sends the instruction of circuit breaker 11 separating brake, circuit breaker 11 shunt opening coil motion, and circuit breaker 11 disconnects; Otherwise, then continue to detect current value and magnitude of voltage.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection range of the present utility model.
Claims (4)
1. one kind possesses the photovoltaic combiner box of photovoltaic DC side short-circuit protection and monitoring, comprise on each branch road and fuse (2) is all installed, after the fuse (2) of each branch road of described positive pole, diode (3) is installed, and the bus-bar that multiple branch circuit positive and negative electrode confluxes (1), it is characterized in that: this header box also comprises lightning protection device (4), circuit breaker (11) and protective device, the positive and negative electrode after confluxing is installed successively described lightning protection device (4), described protective device and circuit breaker (11);
Described protective device comprises current collecting device and voltage collecting device, described current collecting device is arranged on the bus of described circuit breaker (11), for gathering the current value of described circuit breaker (11) front end direct current bus, described voltage collecting device is just being arranged at described circuit breaker (11), between negative pole, for just gathering described circuit breaker (11) front end circuit, magnitude of voltage between negative pole, output connection control device (14) respectively of described current collecting device and described voltage collecting device, the output of described controller (14) connects the shunt opening coil of described circuit breaker (11) for controlling described circuit breaker (11) action,
Described protective device also comprises power module (17), and described power module (17) accesses the end of incoming cables of described circuit breaker (11).
2. possesses the photovoltaic combiner box of photovoltaic DC side short-circuit protection and monitoring as claimed in claim 1, it is characterized in that: described current collecting device is for being arranged at the current sensor (12) on described circuit breaker (11) front end direct current bus, described voltage collecting device is for being just arranged at described circuit breaker (11), voltage converter (13) between negative pole, the output of described current sensor (12) is connected described controller (14) respectively with the output of described voltage converter (13), this short-circuit protection also comprises power module (17), described power module (17) accesses the end of incoming cables of described circuit breaker (11).
3. possesses the photovoltaic combiner box of photovoltaic DC side short-circuit protection and monitoring as claimed in claim 2, it is characterized in that: this protective device also comprises temperature sensor (5), lightning protection device switching value (6) and auxiliary contacts of circuit breaker (7), described temperature sensor (5) is arranged in header box, the output of described temperature sensor (5) connects described controller (14), described lightning protection device switching value (6) connects described controller (14), for gathering lightning protection device state, transfer in controller (14); Described auxiliary contacts of circuit breaker (7) connects described controller (14), for gathering circuit breaker (14) state, transfers in controller (14).
4. possesses the photovoltaic combiner box of photovoltaic DC side short-circuit protection and monitoring as claimed in claim 3; it is characterized in that: this protective device also comprises man-machine interface (15) and Control Room (16), described controller (14) connect man-machine interface (15) and Control Room (16) respectively by communication interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520380305.XU CN204652310U (en) | 2015-06-05 | 2015-06-05 | A kind of photovoltaic combiner box possessing photovoltaic DC side short-circuit protection and monitoring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520380305.XU CN204652310U (en) | 2015-06-05 | 2015-06-05 | A kind of photovoltaic combiner box possessing photovoltaic DC side short-circuit protection and monitoring |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204652310U true CN204652310U (en) | 2015-09-16 |
Family
ID=54105017
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520380305.XU Expired - Fee Related CN204652310U (en) | 2015-06-05 | 2015-06-05 | A kind of photovoltaic combiner box possessing photovoltaic DC side short-circuit protection and monitoring |
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|---|---|
| CN (1) | CN204652310U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110829975A (en) * | 2019-12-12 | 2020-02-21 | 中环天仪股份有限公司 | Direct-current photovoltaic combiner box system based on high-altitude environment and implementation method |
| CN110896227A (en) * | 2018-09-12 | 2020-03-20 | 阳光电源股份有限公司 | Photovoltaic power generation system and photovoltaic inverter |
| CN111740392A (en) * | 2020-07-28 | 2020-10-02 | 阳光电源股份有限公司 | Fault protection method, intelligent combiner box and photovoltaic inversion system |
| CN112180219A (en) * | 2020-10-13 | 2021-01-05 | 南京科远智慧科技集团股份有限公司 | Cable circuit of industrial digital quantity output loop and implementation method |
| CN112367039A (en) * | 2020-11-09 | 2021-02-12 | 华北电力科学研究院有限责任公司 | Intelligent header box |
| CN113826302A (en) * | 2020-04-13 | 2021-12-21 | 华为数字能源技术有限公司 | Protection device and protection method of photovoltaic power generation system and photovoltaic power generation system |
-
2015
- 2015-06-05 CN CN201520380305.XU patent/CN204652310U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110896227A (en) * | 2018-09-12 | 2020-03-20 | 阳光电源股份有限公司 | Photovoltaic power generation system and photovoltaic inverter |
| CN110896227B (en) * | 2018-09-12 | 2021-11-02 | 阳光电源股份有限公司 | Photovoltaic power generation system and photovoltaic inverter |
| CN110829975A (en) * | 2019-12-12 | 2020-02-21 | 中环天仪股份有限公司 | Direct-current photovoltaic combiner box system based on high-altitude environment and implementation method |
| CN113826302A (en) * | 2020-04-13 | 2021-12-21 | 华为数字能源技术有限公司 | Protection device and protection method of photovoltaic power generation system and photovoltaic power generation system |
| US11870238B2 (en) | 2020-04-13 | 2024-01-09 | Huawei Digital Power Technologies Co., Ltd. | Protection apparatus and protection method for photovoltaic power generation system |
| CN111740392A (en) * | 2020-07-28 | 2020-10-02 | 阳光电源股份有限公司 | Fault protection method, intelligent combiner box and photovoltaic inversion system |
| CN112180219A (en) * | 2020-10-13 | 2021-01-05 | 南京科远智慧科技集团股份有限公司 | Cable circuit of industrial digital quantity output loop and implementation method |
| CN112180219B (en) * | 2020-10-13 | 2024-02-27 | 南京科远智慧科技集团股份有限公司 | Cable circuit of industrial digital quantity output loop and implementation method |
| CN112367039A (en) * | 2020-11-09 | 2021-02-12 | 华北电力科学研究院有限责任公司 | Intelligent header box |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150916 Termination date: 20200605 |