CN110768626A - Circuit conversion structure in PID recovery device of solar power station - Google Patents
Circuit conversion structure in PID recovery device of solar power station Download PDFInfo
- Publication number
- CN110768626A CN110768626A CN201911193948.2A CN201911193948A CN110768626A CN 110768626 A CN110768626 A CN 110768626A CN 201911193948 A CN201911193948 A CN 201911193948A CN 110768626 A CN110768626 A CN 110768626A
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- module
- recovery device
- conductive connection
- insulation detection
- pid recovery
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- 238000011084 recovery Methods 0.000 title claims abstract description 33
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 12
- 238000001514 detection method Methods 0.000 claims abstract description 48
- 238000009413 insulation Methods 0.000 claims abstract description 38
- 238000004891 communication Methods 0.000 claims description 6
- 230000007547 defect Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
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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
A circuit conversion structure in a PID recovery device of a solar power station comprises an insulation detection module and the PID recovery device, wherein the PID recovery device comprises a power supply module, a relay device and a control module, a grounding port of the insulation detection module is in conductive connection with the relay device, the relay device is in conductive connection with the ground, and a positive port and a negative port of the insulation detection module are respectively in conductive connection with a positive electrode and a negative electrode of direct current; the positive terminal of the power supply module is in conductive connection with the positive electrode of direct current, the negative terminal of the power supply module is in conductive connection with the ground, and the control module is in conductive connection with the power supply module. The invention overcomes the defects of the prior art, when the PID recovery device works, the insulation detection device is disconnected, and the insulation condition of the power station system is monitored by the PID recovery device. When the PID recovery device stops working, the insulation detection device is connected, and the insulation detection module works normally. Therefore, the function of PID recovery is achieved, and the normal function of the insulation detection function and the normal work of the inverter are not influenced.
Description
Technical Field
The invention relates to the technical field of photovoltaic power generation, in particular to a circuit conversion structure in a PID recovery device of a solar power station.
Background
The PID phenomenon of a solar power station is a phenomenon in which the generated power of a solar cell module is attenuated in the outdoor application process. The PID phenomenon of the solar power station can be alleviated and solved from the viewpoints of a cell process, a module process, a system structure, and the like.
In general, the inverter starts to operate when the inverter is insulated and meets the requirement, which is detected in a period of time before the inverter is started. Some inverters are also provided with an insulation detection module inside, and the insulation detection module is connected with a positive electrode, a negative electrode and the ground of direct current. When the PID recovery device and the direct current detection module work simultaneously, even if the insulation problem does not exist actually, the inverter can display an alarm state, and normal starting in the daytime is influenced.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a circuit conversion structure in a PID recovery device of a solar power station, which overcomes the defects of the prior art, has reasonable design, and can disconnect an insulation detection device of an inverter and monitor the insulation condition of a power station system by the PID recovery device when the PID recovery device starts to work at night. And when the PID recovery device stops working in daytime, the inverter insulation detection device is connected, and the insulation detection module works normally. Therefore, the function of PID recovery is achieved, and the normal function of the insulation detection function and the normal work of the inverter are not influenced.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a circuit conversion structure in a PID recovery device of a solar power station comprises an insulation detection module and the PID recovery device, wherein the PID recovery device comprises a power supply module, a relay device and a control module, a grounding port of the insulation detection module is in conductive connection with one end of the relay device, the other end of the relay device is in conductive connection with the ground, and a positive port and a negative port of the insulation detection module are respectively in conductive connection with a positive electrode and a negative electrode of direct current; the positive terminal of the power supply module is in conductive connection with the positive electrode of direct current, the negative terminal of the power supply module is in conductive connection with the ground, and the control module is in conductive connection with the power supply module.
Preferably, the power supply further comprises a current detection module, wherein two ends of the current detection module are respectively in conductive connection with the positive end of the power supply module and the positive electrode of the direct current, and the signal end of the current detection module is in communication connection with the signal end of the control module and is used for detecting the current value of the direct current circuit and feeding the current value back to the control module.
Preferably, the signal terminal of the control module is further connected with the control terminal of the relay device in a communication manner.
Preferably, the solar power generation system further comprises at least one solar battery and an inverter, wherein the inverter comprises an insulation detection module and an inversion unit, the inversion unit is used for inverting the direct current into alternating current which can be merged into a power grid, and the solar battery is used for converting solar energy into the direct current; the positive pole and the negative pole of solar cell are connected with the positive pole incoming end and the negative pole incoming end of the insulation detection module in a conductive mode respectively, and the positive pole end of the power module is also connected with the positive pole of the solar cell in a conductive mode.
Preferably, the alternating current output end of the inverter unit is connected to a power grid in a grid-connected mode.
The invention provides a circuit conversion structure in a PID recovery device of a solar power station. The method has the following beneficial effects: at night, when the PID recovery device starts to work, the insulation detection device of the inverter is disconnected, and the insulation condition of the power station system is monitored by the PID recovery device. And when the PID recovery device stops working in daytime, the inverter insulation detection device is connected, and the insulation detection module works normally. Therefore, the function of PID recovery is achieved, and the normal function of the insulation detection function and the normal work of the inverter are not influenced.
Drawings
In order to more clearly illustrate the present invention or the prior art solutions, the drawings that are needed in the description of the prior art will be briefly described below.
FIG. 1 is a schematic diagram of a prior art structure;
FIG. 2 is a schematic structural diagram of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings.
As shown in fig. 2, a circuit switching structure in a PID recovery device of a solar power station includes an insulation detection module 2-1 and a PID recovery device 3, where the PID recovery device 3 includes a power module 3-1, a relay device 3-2 and a control module 3-3, a ground port of the insulation detection module 2-1 is electrically connected to one end of the relay device 3-2, the other end of the relay device 3-2 is electrically connected to the ground, and a positive port and a negative port of the insulation detection module 2-1 are respectively electrically connected to a positive electrode and a negative electrode of a direct current; the positive terminal of the power module 3-1 is in conductive connection with the positive electrode of direct current, the negative terminal of the power module 3-1 is in conductive connection with the ground, and the control module 3-3 is in conductive connection with the power module 3-1.
The direct current detection circuit further comprises a current detection module 3-4, wherein two ends of the current detection module 3-4 are respectively in conductive connection with the positive electrode end of the power supply module 3-1 and the positive electrode of the direct current, and the signal end of the current detection module 3-3 is in communication connection with the signal end of the control module 3-3 and is used for detecting the current value of the direct current circuit and feeding the current value back to the control module 3-3; and the signal end of the control module 3-3 is also in communication connection with the control end of the relay device 3-2.
The solar energy power supply system further comprises at least one solar cell 1 and an inverter 2, wherein the inverter 2 comprises an insulation detection module 2-1 and an inverter unit 2-2, the inverter unit 2-2 is used for inverting the direct current into alternating current which can be merged into a power grid, and the solar cell 1 is used for converting solar energy into the direct current; the positive electrode and the negative electrode of the solar battery 1 are respectively in conductive connection with the positive electrode access end and the negative electrode access end of the insulation detection module 2-1, and the positive electrode end of the power supply module 3-1 is also in conductive connection with the positive electrode of the solar battery 1; and the alternating current output end of the inversion unit 2-2 is connected with a power grid in a grid-connected mode.
Under the night condition, the control module 3-3 controls the power supply module 3-1 to be started, and when the voltage of the power supply module 3-1 rises to a set voltage value. Then, by arranging the relay device 3-2, the control module 3-3 controls the relay device 3-2 to be disconnected when the solar power station does not work at night, so that the insulation detection module 2-1 stops working; and under the daytime condition, the control module 3-3 controls the power supply module 3-1 to be closed, and simultaneously controls the power supply module 3-1 to be sucked, so that the grounding port of the insulation detection module 2-1 is communicated with the ground, and the normal work of grounding detection is ensured.
The control means of the control module 3-4 for the power module 3-1 and the relay device 3-2 can be time control, and the time for turning on and off the power module 3-1 is set in the control module 3-3; in this embodiment, the power module 3-1 may be set to have an on time of 20:00 and an off time of 6:00 while the relay device 3-2 is opened and closed at the same time. The power module 3-1 can also be controlled to be switched on and off according to the current value fed back by the current detection module 3-4, when the current value fed back by the current detection module 3-4 is lower than a certain value, the power module 3-1 is switched on, and when the current value fed back by the current detection module 3-4 is higher than a certain value, the power module 3-1 is switched off.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (5)
1. A circuit conversion structure in a PID recovery device of a solar power station is characterized in that: the PID recovery device comprises a power supply module, a relay device and a control module, wherein a grounding port of the insulation detection module is in conductive connection with one end of the relay device, the other end of the relay device is in conductive connection with the ground, and a positive port and a negative port of the insulation detection module are respectively in conductive connection with a positive electrode and a negative electrode of direct current;
the positive terminal of the power supply module is in conductive connection with the positive electrode of direct current, the negative terminal of the power supply module is in conductive connection with the ground, and the control module is in conductive connection with the power supply module.
2. The circuit conversion structure in the PID recovery device of the solar power station as claimed in claim 1, wherein: the current detection module is connected with the positive end of the power module and the positive electrode of the direct current respectively in a conductive mode, the signal end of the current detection module is in communication connection with the signal end of the control module and used for detecting the current value of the direct current circuit and feeding the current value back to the control module.
3. The circuit conversion structure in the PID recovery device of the solar power station as claimed in claim 2, wherein: and the signal end of the control module is also in communication connection with the control end of the relay device.
4. The circuit conversion structure in the PID recovery device of the solar power station as claimed in claim 1, wherein: the system comprises an insulation detection module, an inverter and at least one solar cell, wherein the inverter comprises the insulation detection module and an inversion unit, the inversion unit is used for inverting the direct current into alternating current which can be merged into a power grid, and the solar cell is used for converting solar energy into the direct current; the positive pole and the negative pole of solar cell are connected with the positive pole incoming end and the negative pole incoming end of the insulation detection module in a conductive mode respectively, and the positive pole end of the power module is also connected with the positive pole of the solar cell in a conductive mode.
5. The circuit conversion structure in the PID recovery device of the solar power station as claimed in claim 4, wherein: and the alternating current output end of the inversion unit is connected with a power grid in a grid mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911193948.2A CN110768626A (en) | 2019-11-28 | 2019-11-28 | Circuit conversion structure in PID recovery device of solar power station |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911193948.2A CN110768626A (en) | 2019-11-28 | 2019-11-28 | Circuit conversion structure in PID recovery device of solar power station |
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| CN110768626A true CN110768626A (en) | 2020-02-07 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113852129A (en) * | 2021-11-04 | 2021-12-28 | 阳光电源股份有限公司 | Photovoltaic power generation system and control method thereof |
| WO2022032635A1 (en) * | 2020-08-14 | 2022-02-17 | 华为数字能源技术有限公司 | Linkage protection system and method for photovoltaic power station |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105591609A (en) * | 2015-12-31 | 2016-05-18 | 北京天诚同创电气有限公司 | PID processing method and system of photovoltaic system |
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2019
- 2019-11-28 CN CN201911193948.2A patent/CN110768626A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105591609A (en) * | 2015-12-31 | 2016-05-18 | 北京天诚同创电气有限公司 | PID processing method and system of photovoltaic system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022032635A1 (en) * | 2020-08-14 | 2022-02-17 | 华为数字能源技术有限公司 | Linkage protection system and method for photovoltaic power station |
| CN114391220A (en) * | 2020-08-14 | 2022-04-22 | 华为数字能源技术有限公司 | Photovoltaic power station linkage protection system and method |
| CN113852129A (en) * | 2021-11-04 | 2021-12-28 | 阳光电源股份有限公司 | Photovoltaic power generation system and control method thereof |
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Application publication date: 20200207 |