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Photovoltaic module attenuation repair method and device in a photovoltaic power station

A photovoltaic module, photovoltaic power station technology, applied in circuit devices, photovoltaic power generation, photovoltaic system monitoring and other directions

Active Publication Date: 2019-11-26
HUAWEI DIGITAL POWER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that the photovoltaic module repair method provided by the prior art can only repair the potential-induced attenuation, the embodiment of the present application provides a photovoltaic module attenuation repair method and device in a photovoltaic power station

Method used

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  • Photovoltaic module attenuation repair method and device in a photovoltaic power station
  • Photovoltaic module attenuation repair method and device in a photovoltaic power station
  • Photovoltaic module attenuation repair method and device in a photovoltaic power station

Examples

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example 1

[0109] Example 1. Power station A uses p-type monocrystalline 265W photovoltaic modules. After two years of grid connection, the method provided by the embodiment of this application is used to perform attenuation repair. The current of the photovoltaic module is injected into the photovoltaic module to be repaired, and the current is maintained at (30-I 2 / 0.9)A, the duration is 3h, and the final repair attenuation is 1.8%.

example 2

[0110] Example 2. Power station B adopts p-type single crystal 270W photovoltaic modules. After one year of grid connection, the method provided by the embodiment of this application is used for attenuation repair. The details are as follows: use an external AC pulse power supply to inject AC current into the photovoltaic modules to be repaired , the parameters of the alternating current are as follows: the pulse amplitude is 1000V, the pulse width range is 0.5s, the pulse period is 1s, the duration is 4h, and the final restoration attenuation is 1.2%.

example 3

[0111] Example 3. Power station C uses p-type polycrystalline 250W photovoltaic modules. After two years of grid connection, the method provided by the embodiment of this application is used to repair the attenuation. The details are as follows: use the inverter to control the current flow of the photovoltaic After rectification, it is injected into the photovoltaic module to be repaired, the current is controlled at 15A, the duration is 2.5h, and the final repair attenuation is 1.5%.

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Abstract

The application discloses a method and device for repairing attenuation of a photovoltaic module in a photovoltaic power station, belonging to the field of photovoltaic power generation. The method includes: firstly controlling the output of the photovoltaic module to be repaired in the photovoltaic power station, and then injecting repair current into the positive and negative poles of the photovoltaic module to be repaired. By adopting this method to repair the photovoltaic module, it is possible to simultaneously repair the attenuation of the photovoltaic module caused by the initial light-induced attenuation of the module, the aging attenuation of the module material, the potential-induced attenuation, and other reasons (such as external environment or destructive factors).

Description

technical field [0001] The present application relates to the field of photovoltaic power generation, in particular to a method and device for repairing attenuation of photovoltaic modules in a photovoltaic power station. Background technique [0002] Photovoltaic power generation, as a new form of green energy utilization, has been highly valued and vigorously developed by the state in recent years. The principle of photovoltaic power generation is to use photovoltaic modules (that is, solar panels) to convert light energy into electrical energy. [0003] Photovoltaic modules mainly include a back plate, an encapsulation glass opposite to the back plate, a frame arranged around the back plate and the encapsulation glass, a sealing material used to seal between the frame and the back plate and between the frame and the encapsulation glass, and the The battery string between the back plate and the packaging glass and the junction box arranged on the back plate, the terminals...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02S40/30H02S40/32H02S40/34
CPCH02S40/30H02S40/32H02S40/34H02S50/00Y02E10/56Y02E10/50H02J2300/26H02J3/381
Inventor 顾鑫沈培俊张先淼
Owner HUAWEI DIGITAL POWER TECH CO LTD