CN211405502U - System for preventing potential induced attenuation - Google Patents
System for preventing potential induced attenuation Download PDFInfo
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- CN211405502U CN211405502U CN201921990687.2U CN201921990687U CN211405502U CN 211405502 U CN211405502 U CN 211405502U CN 201921990687 U CN201921990687 U CN 201921990687U CN 211405502 U CN211405502 U CN 211405502U
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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
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The utility model is suitable for a photovoltaic power generation field provides a prevent system of induced decay of electric potential, the system includes communication module, high frequency auxiliary power supply, coupling circuit and adjustable direct current source, and photovoltaic cell board has high voltage to ground among the solution prior art, can reduce photovoltaic cell's the technical problem of generating performance.
Description
Technical Field
The utility model belongs to the photovoltaic power generation field especially relates to a prevent system of induced decay of electric potential.
Background
Potential Induced attenuation, abbreviated as pid (potential Induced attenuation), for the reasons: photovoltaic panels have a high voltage to ground, which can degrade the power generation performance of the photovoltaic cells. The positive and negative of the high voltage depend on the type of the photovoltaic cell panel, and the PID effect is generated when a P-type photovoltaic panel has a negative voltage to the ground or when an N-type photovoltaic panel has a positive voltage to the ground.
Disclosure of Invention
An object of the utility model is to provide a prevent system of induced decay of electric potential aims at solving among the prior art photovoltaic cell board and has high voltage to ground, can reduce photovoltaic cell's the generating performance's technical problem.
The utility model is realized in such a way that the system for preventing potential induced attenuation comprises a communication module, a high-frequency auxiliary power supply, a coupling circuit and an adjustable direct current source, the input end of the high-frequency auxiliary power supply is connected with the low-voltage input end of the isolation transformer to convert the three-phase alternating voltage into direct-current voltage for output, the output end of the high-frequency auxiliary power supply is connected with the adjustable direct current source and the communication module, the input end of the coupling circuit is connected with a three-phase power line of the grid-connected inverter, the output end of the coupling circuit is a three-phase voltage neutral point N, the input end of the communication module is in communication connection with the grid-connected inverter, the output end of the communication module is in communication connection with the control end of the adjustable direct current source to control the adjustable direct current source to be opened or closed, the anode of the output end of the adjustable direct current source is connected with the neutral point N output by the coupling circuit, and the cathode of the output end of the adjustable direct current source is connected with the ground PE.
The utility model discloses a further technical scheme is: the coupling circuit adopts an impedance star connection method, and the impedance is an inductor, a resistor, a capacitor or a combination of the inductor and the resistor and the inductor and the capacitor.
The utility model discloses a further technical scheme is: the adjustable direct current source is an isolation DC/DC circuit and is used for adjusting the voltage of the N pairs of PEs.
The utility model discloses a further technical scheme is: the input end of the communication module is in communication connection with the grid-connected inverter in a wired or wireless mode.
The utility model has the advantages that: compared with the prior art, the photovoltaic grid-connected power generation system has the advantages that the photovoltaic grid-connected power generation system can be completely independent of the photovoltaic power generation system, the high-frequency transformer is adopted, the volume and the weight are small, the standby power consumption is low, the photovoltaic grid-connected power generation system can work only when the trigger condition is met, the safety protection function is provided, the photovoltaic power generation system faults are reported after the voltage regulation range exceeds the threshold value between the upper limit interval and the lower limit interval, the photovoltaic grid-connected power generation system is compatible with the photovoltaic grid-connected power generation system formed by the P-type photovoltaic.
Drawings
FIG. 1 is a photovoltaic power generation system for preventing potential induced degradation provided by an embodiment of the present invention;
FIG. 2 is a system configuration diagram for preventing potential induced degradation according to an embodiment of the present invention;
fig. 3 is a coupling circuit of a system for preventing potential-induced attenuation according to an embodiment of the present invention.
Detailed Description
Fig. 1 shows a pair of prevent induced decay of electric potential's system that provides, be applied to and have isolation transformer's photovoltaic power generation system between the electric wire netting for change grid-connected inverter three-phase and exchange the voltage of output side midpoint to ground, this system installs as independent unit, can effectively restrain photovoltaic module's the induced decay effect of electric potential.
As shown in fig. 1, the photovoltaic power generation system has the following structure: the output end of the photovoltaic module # M is connected with the input end of the grid-connected inverter # M, wherein M is any number from 1 to X (X is more than or equal to 2), the alternating current output end of the grid-connected inverter is connected with the low-voltage side of the isolation transformer, and the high-voltage side of the isolation transformer is connected with a power grid.
As shown in fig. 2, the system for preventing potential-induced degradation comprises: a communication module, a high-frequency auxiliary power supply (AC/DC), a coupling circuit and an adjustable direct current source (DC/DC), the input end of the high-frequency auxiliary power supply is connected with the low-voltage input end of the isolation transformer to convert the three-phase alternating voltage into direct-current voltage for output, the output end of the high-frequency auxiliary power supply is connected with the adjustable direct current source and the communication module, the input end of the coupling circuit is connected with a three-phase power line of the grid-connected inverter, the output end of the coupling circuit is a three-phase voltage neutral point N, the input end of the communication module is in communication connection with the grid-connected inverter in a wired or wireless mode, the output end of the communication module is in communication connection with the control end of the adjustable direct current source to control the adjustable direct current source to be opened or closed, the anode of the output end of the adjustable direct current source is connected with the neutral point N output by the coupling circuit, and the cathode of the output end of the adjustable direct current source is connected with the ground PE.
The communication module is used for acquiring the number and the working state of the inverters in the photovoltaic power generation system in real time, ensuring that all the inverters are started completely, starting the adjustable direct current source to work after the inverters enter a grid-connected power generation state, and controlling the adjustable direct current source to be closed if any inverter in the photovoltaic power generation system cannot be started for various reasons.
In a photovoltaic grid-connected power generation system, a grid-connected inverter outputs three-phase power.
The adjustable direct current source adjusts the voltage from the neutral point N to the PE, the adjusting range is within a certain interval, and when the voltage reaches the upper limit and the lower limit of the interval, if the voltage of PV-to-PE can not meet the requirement, the fault of the photovoltaic power generation system is reported.
The communication module controls the adjustable direct current power supply to be started if and only if all the inverters work in a grid-connected power generation state, and one of the following two conditions is met: (1) for a photovoltaic module consisting of a P-type photovoltaic cell panel, if and only if the PV-to-PE voltage is less than 0; (2) for a photovoltaic module consisting of an N-type photovoltaic panel, if and only if the PV-to-PE voltage is greater than 0.
As shown in fig. 3, the coupling circuit is star-connected by impedance, which may be inductance, resistance, capacitance, or a combination of inductance and resistance, inductance and capacitance.
The communication module receives the PV-to-PE sampling information, and the communication mode can be a wired mode or a wireless mode.
The adjustable direct current source is an isolation DC/DC circuit and is used for adjusting the voltage of the N pairs of PEs.
In the working process, after all grid-connected inverters normally work in a photovoltaic power generation system formed by the P-type photovoltaic modules, if the voltage of the PV-pair PE is greater than or equal to 0, the adjustable direct current source module in the PID system is prevented from not working. At this time, the auxiliary power supply only provides the working power of the communication module. If the voltage of the PV-pair PE is negative, the auxiliary power supply provides working power of the communication module and the adjustable direct current source, and the adjustable direct current source adjusts and outputs direct current voltage according to the fed-back sampling information until the voltage of the PV-pair PE of all the grid-connected inverters which normally work is greater than or equal to 0. And if the output of the direct current source exceeds the upper limit of the interval, reporting a fault.
Compared with the prior art, the photovoltaic grid-connected power generation system has the advantages that the photovoltaic grid-connected power generation system can be completely independent of the photovoltaic power generation system, the high-frequency transformer is adopted, the volume and the weight are small, the standby power consumption is low, the photovoltaic grid-connected power generation system can work only when the trigger condition is met, the safety protection function is provided, the photovoltaic power generation system faults are reported after the voltage regulation range exceeds the threshold value between the upper limit interval and the lower limit interval, the photovoltaic grid-connected power generation system is compatible with the photovoltaic grid-connected power generation system formed by the P-type photovoltaic.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (4)
1. A system for preventing potential induced degradation, comprising: the system comprises a communication module, a high-frequency auxiliary power supply, a coupling circuit and an adjustable direct current source, wherein the input end of the high-frequency auxiliary power supply is connected with the low-voltage input end of an isolation transformer to convert three-phase alternating current voltage into direct current voltage for output, the output end of the high-frequency auxiliary power supply is connected with the adjustable direct current source and the communication module, the input end of the coupling circuit is connected with a three-phase power line of a grid-connected inverter, the output end of the coupling circuit is a three-phase voltage neutral point N which is constructed, the input end of the communication module is connected with the grid-connected inverter in a communication mode, the output end of the communication module is connected with the control end of the adjustable direct current source in a communication mode to control the adjustable direct current source to be turned on or turned off, the positive pole of.
2. The system of claim 1, wherein the coupling circuit is configured as an impedance wye connection, wherein the impedance is an inductor, a resistor, a capacitor, or a combination of an inductor and a resistor, an inductor and a capacitor.
3. The system of claim 2, wherein the adjustable DC source is an isolated DC/DC circuit for adjusting the voltage of the N pairs of PEs.
4. The system of claim 2, wherein the input end of the communication module is in communication connection with the grid-connected inverter in a wired or wireless manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921990687.2U CN211405502U (en) | 2019-11-18 | 2019-11-18 | System for preventing potential induced attenuation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921990687.2U CN211405502U (en) | 2019-11-18 | 2019-11-18 | System for preventing potential induced attenuation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211405502U true CN211405502U (en) | 2020-09-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921990687.2U Active CN211405502U (en) | 2019-11-18 | 2019-11-18 | System for preventing potential induced attenuation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211405502U (en) |
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2019
- 2019-11-18 CN CN201921990687.2U patent/CN211405502U/en active Active
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20221102 Address after: Floor 9, Keshida Industrial Park R&D Building, No.7 Road, Gaoxinyuan West District, Guangming New District, Shenzhen, Guangdong 518000 Patentee after: SHENZHEN KSTAR NEW ENERGY Co.,Ltd. Address before: 518000 rooms 401 and 402, 4th floor, building 1, software park, kejizhong 2nd Road, Gaoxin North District, Nanshan District, Shenzhen City, Guangdong Province (office only) Patentee before: SHENZHEN KSTAR SCIENCE AND TECHNOLOGY Co.,Ltd. Patentee before: SHENZHEN KSTAR NEW ENERGY Co.,Ltd. |
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| TR01 | Transfer of patent right |