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Device for lowering potential induction decay

A potential-induced attenuation and external battery technology, applied in photovoltaic power generation, electrical components, photovoltaic modules, etc., can solve the problems of increased system cost, unreliability, inconvenient maintenance, etc., to achieve simple and reliable implementation, convenient maintenance, and convenience. The effect of mass production

Inactive Publication Date: 2014-12-10
SUNGROW POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above two solutions require an external power supply, which increases the cost and unreliability of the system, and it is inconvenient to repair if there is a problem

Method used

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  • Device for lowering potential induction decay

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] see figure 1 , which is a schematic diagram of Embodiment 1 of the device for reducing potential-induced decay provided by the present invention.

[0055] The device for reducing potential-induced attenuation provided in this embodiment is applied to a photovoltaic system in which multiple inverters are connected in parallel, including: an external solar panel PVpid;

[0056]The external solar panel PVpid includes at least one solar panel, that is, the external solar panel can be implemented as a single solar panel, or can be implemented as a PV string in which multiple solar panels are connected in series, or can be implemented as a plurality of PV strings connected in parallel. together to achieve.

[0057] Such as figure 1 As shown, there are N (N≥2) inverters connected in parallel, which are the first inverter Inv1, the second inverter Inv2, ... the Nth inverter InvN.

[0058] It should be noted that the output terminals of the N parallel-connected inverters are ...

Embodiment 2

[0077] see figure 2 , which is a schematic diagram of Embodiment 2 of the device for reducing potential-induced decay provided by the present invention.

[0078] This embodiment and figure 1 The difference of the shown embodiment one is:

[0079] The negative pole of the external battery board is connected to the positive pole of the PV array corresponding to the first inverter. Such as figure 2 As shown, the negative pole of PVpid is connected to the positive pole PV+ of VPV1. In this way, the voltage of PV+ to ground is negative, so that both PV+ and PV- are negative to ground, so as to realize the reverse PID function.

[0080] When the positive pole of the external solar panel is connected to the negative pole of the PV array corresponding to the first inverter, as figure 1 As shown, the grounding method of the negative electrode of the external battery board is any one of the following or a combination of several of them: direct grounding, grounding through a posit...

Embodiment 3

[0094] see image 3 , which is a schematic diagram of Embodiment 3 of the device for reducing potential-induced decay provided by the present invention.

[0095] A potential-induced attenuation device provided in this embodiment is applied to the photovoltaic grid connection of a single inverter, including: an external battery board PVpid;

[0096] The external solar panel PVpid includes at least one solar panel, that is, the external solar panel can be implemented as a single solar panel, or can be implemented as a PV string in which multiple solar panels are connected in series, or can be implemented as a plurality of PV strings connected in parallel. together to achieve.

[0097] The external battery board PVpid is connected to the PV array at the input end of the inverter Inv;

[0098] It can be understood that, since there is only one inverter corresponding to this embodiment, there is also one corresponding PV array, and only one external battery board needs to be conn...

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Abstract

The invention provides a device for lower potential induction decay. The device applied to photovoltaic system with multiple parallelly-connected inverters comprises an externally-connected solar panel. The externally-connected solar panel is connected to the PV array of the input end of an optional inverter. The inverter connected with the externally-connected solar panel is marked as an externally-connected inverter. The sum of the output voltage of the corresponding PV array of the externally-connected inverter and the output voltage of the externally-connected solar panel is larger than the input voltage of optional one of other (N-1) inverters, wherein N is the number of the parallelly-connected inverters. The anode of the externally-connected solar panel is connected with the cathode of the corresponding PV array of the first inverter or the cathode of the externally-connected solar panel is connected with the anode of the corresponding PV array of the first inverter. The device has the advantages that only an extra small solar panel needs to be added to the single input solar panel, software control is not needed, the device is simple and reliable, convenient to maintain and quite low in relative cost, inverter change is avoided, and batch production of the inverters is facilitated.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation equipment, in particular to a device for reducing potential-induced attenuation. Background technique [0002] Potential Induced Degradation (PID, Potential Induced Degradation): It is a phenomenon that the performance of the component is reduced due to the high voltage applied to the ground. The high voltage can be positive or negative depending on the characteristics of the battery board. The performance degradation of the module is manifested as a decrease in the open circuit voltage (Voc) and a decrease in the fill factor (FF). This phenomenon can be recovered under the reverse pressure. [0003] At present, in order to suppress the PID effect of the battery board, there are two main anti-PID technologies adopted at home and abroad: [0004] The first is to indirectly raise the voltage of the negative electrode PV- of the battery panel to ground above 0V (earth potential...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02S40/32
CPCY02E10/50
Inventor 耿后来邢军徐清清李浩源梅晓东
Owner SUNGROW POWER SUPPLY CO LTD
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