CN203632611U - Device capable of simultaneously realizing photovoltaic power station cathode grounding and ground insulation impedance detection - Google Patents
Device capable of simultaneously realizing photovoltaic power station cathode grounding and ground insulation impedance detection Download PDFInfo
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- CN203632611U CN203632611U CN201320799235.2U CN201320799235U CN203632611U CN 203632611 U CN203632611 U CN 203632611U CN 201320799235 U CN201320799235 U CN 201320799235U CN 203632611 U CN203632611 U CN 203632611U
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- 238000009413 insulation Methods 0.000 title claims abstract description 29
- 238000001514 detection method Methods 0.000 title claims abstract description 21
- 230000005669 field effect Effects 0.000 claims description 3
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- 150000004706 metal oxides Chemical class 0.000 claims description 3
- 238000010248 power generation Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 5
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- 238000005516 engineering process Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000002900 effect on cell Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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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
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- Y02E10/50—Photovoltaic [PV] energy
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Abstract
The utility model discloses a device capable of simultaneously realizing photovoltaic power station cathode grounding and ground insulation impedance detection; the device comprises a grounding terminal and an insulation impedance detection terminal; the grounding terminal comprises a grounding switch, a fuse and a current detector; one end of the fuse is connected with one end of the grounding switch, the other end of the fuse is connected with one end of the current detector, the other end of the grounding switch is connected with a cathode of a photovoltaic cell panel and a DC side of a photovoltaic inverter, and the other end of the current detector is grounded; the insulation impedance detection terminal comprises a first grounding resistor and a second grounding resistor. By employing the device of the utility model, the cathode of the photovoltaic power station is grounded, and simultaneously the insulation impedance of the photovoltaic power station can be detected; the device is easy to realize, low in cost, simultaneously a human body electric shock danger protection blind zone in the cathode grounded photovoltaic power station can be eliminated, thereby improving safety of the photovoltaic power generation system.
Description
Technical field
The utility model relates to photovoltaic power generation technology field, relates in particular to a kind of device of simultaneously realizing photovoltaic plant minus earth and insulation against ground impedance detection.
Background technology
Photovoltaic plant is to utilize the photovoltaic effect of semi-conducting material solar energy to be changed into the new power plant of electric energy, and the energy output in this kind of power station depends on the utilance of photovoltaic battery panel to solar energy to a great extent.Potential electromotive force induction decay (Potential-induced degradation, PID) phenomenon is proposed in 2005 by Sunpower company of the U.S. the earliest, specifically refer to that photovoltaic battery panel assembly is for a long time over the ground under negative bias High Pressure, make glass, between encapsulating material, there is leakage current, a large amount of accumulation are on cell piece surface, the passivation effect on cell panel surface worsens, cause activity coefficient FF, short circuit current Isc, reducing appears in open circuit voltage Voc, make the performance of photovoltaic module lower than design standard, as shown in Figure 1, 101 for there is the I-V curve of PID phenomenon, 102 is normal I-V curve.For the photovoltaic plant of selected photovoltaic battery panel brand, adopt in photovoltaic DC-to-AC converter side cell panel minus earth or the mode that applies over the ground forward voltage night are solved to PID phenomenon, wherein at inverter side, the mode of cell panel minus earth is applied the most generally, also adopted minus earth modularity to solve.Photovoltaic battery panel minus earth can effectively solve the PID phenomenon of cell panel, still, in implementation procedure, should be directly by the negative pole of cell panel ground connection nearby, and conventionally need to carry out ground connection by the special minus earth assembly that is arranged on photovoltaic DC-to-AC converter side.Minus earth makes photovoltaic battery panel avoid the interference of PID, can also bring the danger of some potential safety hazards and cell panel short circuit simultaneously.
Fig. 2 is the schematic diagram of minus earth photovoltaic plant, and in figure, PV1 is photovoltaic battery panel, and K1 is the first input switch, and K2 is the second input switch, and F1 is fuse, and I1 is current sensing means, and R1 is the first resistance, and R2 is the second resistance, and IN1 is photovoltaic DC-to-AC converter.Photovoltaic battery panel is by an earth terminal ground connection, and this earth terminal can integrated fuse, and detects the electric current of this earth connection.In the time that human body touches the cell panel of defective insulation or touch other electrified bodies of DC side, human body passes through grounding assembly by the earth and forms current path in DC side, because DC voltage is higher, may on human body, form the electric current of tens milliamperes, people is damaged, now, photovoltaic DC-to-AC converter must, according to the size of earth connection electric current, be judged accident, and disconnects in time input side switch, cut off current path, avoid causing danger.The effect of fuse is that excessive short circuit current can, by minus earth blown fuse, be protected thereby cut off current path in the time that serious short circuit over the ground appears in anode or other pole plate except minus earth.But; still there is potential safety hazard in the safeguard measure of above-mentioned negative ground system; when other the less desirable minus earths except minus earth assembly appear in system; as shown in dotted line frame in Fig. 3; now can between two minus earth loops, distribute according to impedance by the electric current of human body; minus earth detects electric current cannot complete reaction actual human body shock current; even if detecting, cathodal current reaches protection limit value; after DC side switch disconnects; current path is not cut off; danger still exists, and protection exists leak.Wherein, in Fig. 3, PV2 is photovoltaic battery panel, and K3 is the first input switch, and K4 is the second input switch, and F2 is fuse, and I2 is current sensing means, and R3 is the first resistance, and R4 is the second resistance, and IN2 is photovoltaic DC-to-AC converter.
Utility model content
The purpose of this utility model is the device of simultaneously realizing photovoltaic plant minus earth and insulation against ground impedance detection by a kind of, solves the problem that above background technology part is mentioned.
For reaching this object, the utility model by the following technical solutions:
Realize a device for photovoltaic plant minus earth and insulation against ground impedance detection, it comprises earth terminal and insulation impedance detection terminal simultaneously; Described earth terminal comprises earthed switch, fuse and current sensing means, one end of described fuse is connected with one end of earthed switch, the other end is connected with one end of current sensing means, the other end of earthed switch is connected with photovoltaic battery panel negative pole, photovoltaic DC-to-AC converter DC side, the other end ground connection of current sensing means; Described insulation impedance detection terminal comprises the first earth resistance and the second earth resistance, ground connection after one end of described the first earth resistance is connected with one end of the second earth resistance, the other end of the first earth resistance is connected with photovoltaic battery panel negative pole, photovoltaic DC-to-AC converter DC side, and the other end of the second earth resistance is connected with one end of earthed switch.
Especially, described earthed switch is selected any of mechanical switch, electronic switch.
Especially, described mechanical switch comprises relay, circuit breaker; Described electronic switch comprises insulated gate bipolar transistor, metal-oxide half field effect transistor.
The device of realizing photovoltaic plant minus earth and insulation against ground impedance detection when the utility model provides adds an earthed switch on earth connection, when normal operation, this earthed switch is in closure state, by photovoltaic battery panel minus earth, photovoltaic DC-to-AC converter can be protected according to the electric current of earth connection; In the time that need detect the insulation impedance of photovoltaic battery panel, this earthed switch is disconnected, by detecting the voltage of the first earth resistance and the second earth resistance, calculate the insulation impedance of photovoltaic battery panel, simultaneously, owing to having disconnected being connected of earth connection and the earth, the situation of photovoltaic battery panel minus earth now can be detected, if when photovoltaic battery panel minus earth or other ground connection detected, photovoltaic DC-to-AC converter is by alarm, prompting staff checks photovoltaic battery panel, gets rid of potential safety hazard.The utility model is by improving the grounding assembly of original photovoltaic DC-to-AC converter; coordinate corresponding control method; when having realized photovoltaic plant minus earth, the insulation impedance of photovoltaic plant is detected; it is convenient to implement; cost is little; eliminated the blind area of the dangerous protection of human electric shock in minus earth photovoltaic plant, the fail safe that has improved photovoltaic generating system simultaneously.
Accompanying drawing explanation
Fig. 1 is the I-V curve comparison figure of photovoltaic battery panel PID phenomenon;
Fig. 2 is minus earth photovoltaic generating system schematic diagram;
Fig. 3 is minus earth photovoltaic generating system negative pole multipoint earthing situation schematic diagram;
Fig. 4 is the application of installation schematic diagram of simultaneously realizing photovoltaic plant minus earth and insulation against ground impedance detection.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail.Be understandable that, specific embodiment described herein is only for explaining the utility model, but not to restriction of the present utility model.It also should be noted that, for convenience of description, in accompanying drawing, only show the part relevant to the utility model but not full content.
Please refer to shown in Fig. 4, Fig. 4 is the application of installation schematic diagram of simultaneously realizing photovoltaic plant minus earth and insulation against ground impedance detection.
The device of simultaneously realizing photovoltaic plant minus earth and insulation against ground impedance detection in the present embodiment specifically comprises earth terminal and insulation impedance detection terminal.
Described earth terminal comprises earthed switch K5, fuse F3 and current sensing means I3.One end of described fuse F3 is connected with one end of earthed switch K5, the other end is connected with one end of current sensing means I3, the other end of earthed switch K5 is connected with DC side K switch 5, one end of DC side K switch 5 connects photovoltaic battery panel PV3 negative pole, the other end connects photovoltaic DC-to-AC converter IN3 DC side, the other end ground connection of current sensing means I3.Described insulation impedance detection terminal comprises the first earth resistance R5 and the second earth resistance R6.Ground connection after one end of described the first earth resistance R5 is connected with one end of the second earth resistance R6, the other end of the first earth resistance R5 is connected with DC side K switch 6, one end of DC side K switch 6 connects photovoltaic battery panel PV3 negative pole, the other end connects photovoltaic DC-to-AC converter IN3 DC side, and the other end of the second earth resistance R6 is connected with one end of earthed switch K5.
In the present embodiment, described earthed switch K5 is controlled switch, can select any of mechanical switch, electronic switch.Described mechanical switch comprises relay, circuit breaker, and described electronic switch comprises insulated gate bipolar transistor (IGBT), metal-oxide half field effect transistor (MOSFET).This earth terminal can be in photovoltaic DC-to-AC converter IN3 inside, also can be in outside grounding assembly, and current sensing means I3 detects the electric current of this earth terminal.
When normal operation, earthed switch K5 is in closure state, and by photovoltaic battery panel PV3 minus earth, photovoltaic DC-to-AC converter IN3 can protect according to the electric current of earth connection.In the time that need detect the insulation impedance of photovoltaic battery panel PV3, by detecting the voltage of the first earth resistance R5 and the second earth resistance R6, calculate the insulation impedance of photovoltaic battery panel PV3, meanwhile, owing to having disconnected being connected of earth connection and the earth, the situation of photovoltaic battery panel PV3 minus earth now can be detected, if when photovoltaic battery panel PV3 minus earth or other ground connection detected, photovoltaic DC-to-AC converter IN3 is by alarm, and prompting staff checks photovoltaic battery panel PV3, gets rid of potential safety hazard.Except above-mentioned effect, after system detects that Ground leakage current exceeds standard, can automatically disconnect earthed switch K5, thereby reduce system operation risk.
When the technical solution of the utility model has realized photovoltaic plant minus earth, the insulation impedance of photovoltaic plant is detected; it is convenient to implement; cost is little, has eliminated the blind area of the dangerous protection of human electric shock in minus earth photovoltaic plant, the fail safe that has improved photovoltaic generating system simultaneously.
Note, above are only preferred embodiment of the present utility model and institute's application technology principle.Skilled person in the art will appreciate that the utility model is not limited to specific embodiment described here, can carry out for a person skilled in the art various obvious variations, readjust and substitute and can not depart from protection range of the present utility model.Therefore, although the utility model is described in further detail by above embodiment, but the utility model is not limited only to above embodiment, in the situation that not departing from the utility model design, can also comprise more other equivalent embodiment, and scope of the present utility model is determined by appended claim scope.
Claims (3)
1. a device of simultaneously realizing photovoltaic plant minus earth and insulation against ground impedance detection, is characterized in that, comprises earth terminal and insulation impedance detection terminal; Described earth terminal comprises earthed switch, fuse and current sensing means, one end of described fuse is connected with one end of earthed switch, the other end is connected with one end of current sensing means, the other end of earthed switch is connected with photovoltaic battery panel negative pole, photovoltaic DC-to-AC converter DC side, the other end ground connection of current sensing means; Described insulation impedance detection terminal comprises the first earth resistance and the second earth resistance, ground connection after one end of described the first earth resistance is connected with one end of the second earth resistance, the other end of the first earth resistance is connected with photovoltaic battery panel negative pole, photovoltaic DC-to-AC converter DC side, and the other end of the second earth resistance is connected with one end of earthed switch.
2. the device of simultaneously realizing photovoltaic plant minus earth and insulation against ground impedance detection according to claim 1, is characterized in that, described earthed switch is selected any of mechanical switch, electronic switch.
3. the device of simultaneously realizing photovoltaic plant minus earth and insulation against ground impedance detection according to claim 2, is characterized in that, described mechanical switch comprises relay, circuit breaker; Described electronic switch comprises insulated gate bipolar transistor, metal-oxide half field effect transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320799235.2U CN203632611U (en) | 2013-12-05 | 2013-12-05 | Device capable of simultaneously realizing photovoltaic power station cathode grounding and ground insulation impedance detection |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320799235.2U CN203632611U (en) | 2013-12-05 | 2013-12-05 | Device capable of simultaneously realizing photovoltaic power station cathode grounding and ground insulation impedance detection |
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| CN203632611U true CN203632611U (en) | 2014-06-04 |
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| CN201320799235.2U Expired - Lifetime CN203632611U (en) | 2013-12-05 | 2013-12-05 | Device capable of simultaneously realizing photovoltaic power station cathode grounding and ground insulation impedance detection |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103607172A (en) * | 2013-12-05 | 2014-02-26 | 无锡上能新能源有限公司 | Device for simultaneously realizing negative grounding and ground insulation resistance detection in photovoltaic power station |
| WO2018224701A1 (en) * | 2017-06-08 | 2018-12-13 | Aaag Seros Training, S.L. | Assembly system for photovoltaic plants |
-
2013
- 2013-12-05 CN CN201320799235.2U patent/CN203632611U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103607172A (en) * | 2013-12-05 | 2014-02-26 | 无锡上能新能源有限公司 | Device for simultaneously realizing negative grounding and ground insulation resistance detection in photovoltaic power station |
| CN103607172B (en) * | 2013-12-05 | 2017-01-04 | 上能电气股份有限公司 | Realize photovoltaic plant minus earth and the device of ground insulation resistance detection simultaneously |
| WO2018224701A1 (en) * | 2017-06-08 | 2018-12-13 | Aaag Seros Training, S.L. | Assembly system for photovoltaic plants |
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Address after: 214174 Jiangsu Province Economic Development Zone, Huishan wind power science and Technology Industrial Park, wind energy road, No. 1 standard factory building Patentee after: SINENG ELECTRIC Co.,Ltd. Address before: 214174 Jiangsu Province Economic Development Zone, Huishan wind power science and Technology Industrial Park, wind energy road, No. 1 standard factory building Patentee before: Top energy Electric Co.,Ltd. Address after: 214174 Jiangsu Province Economic Development Zone, Huishan wind power science and Technology Industrial Park, wind energy road, No. 1 standard factory building Patentee after: Top energy Electric Co.,Ltd. Address before: 214174 Jiangsu Province Economic Development Zone, Huishan wind power science and Technology Industrial Park, wind energy road, No. 1 standard factory building Patentee before: WUXI SINENG NEW ENERGY CO.,LTD. |