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Method for on-line detecting faults of photovoltaic cells in solar photovoltaic power station on line

A solar cell and solar photovoltaic technology is applied in the field of on-line detection of photovoltaic cell faults in solar photovoltaic power plants, which can solve problems such as the lack of a good method for photovoltaic cell fault diagnosis, and achieve the effects of short diagnosis time and improved safety.

Inactive Publication Date: 2012-07-25
茂盟(上海)工程技术股份有限公司
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no good method for fault diagnosis of individual photovoltaic cells in solar photovoltaic power plants

Method used

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  • Method for on-line detecting faults of photovoltaic cells in solar photovoltaic power station on line
  • Method for on-line detecting faults of photovoltaic cells in solar photovoltaic power station on line
  • Method for on-line detecting faults of photovoltaic cells in solar photovoltaic power station on line

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Embodiment Construction

[0012] like figure 1 The photovoltaic power generation system shown is composed of a square array of solar cells 1, a battery pack 5, a charging and discharging controller 2, an inverter 3, and an AC power distribution cabinet 4 and other equipment. The functions of some of its equipment are:

[0013] Solar cell 1 square array: In the case of light (whether it is sunlight or light generated by other luminous bodies), the battery absorbs light energy, and the accumulation of charges of different signs appears at both ends of the battery, that is, "photovoltage" is generated, which is "Photovoltaic Effect". Under the action of the photovoltaic effect, the two ends of the solar cell generate an electromotive force, which converts light energy into electrical energy, and is an energy conversion device.

[0014] Storage battery pack 5: Its function is to store the electric energy that the solar cell square array emits when it is illuminated and can supply power to the load at any...

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Abstract

The invention relates to a method for on-line detecting the faults of photovoltaic cells in a solar photovoltaic power station. Two controllable switches are respectively connected in series and parallel with the output ends of each cell module in a photovoltaic cell module matrix. A short-circuit current sampling resistor is connected in series with the branch of the parallel controllable switch, and a remote control system controls the two controllable switches of each solar photovoltaic cell, carries out short-circuit test and detection on each cell module needing to be tested, acquires the short-circuit current of the photovoltaic cells by means of the short-circuit current sampling resistors, and judges whether the cell modules have faults according to the short-circuit current. The method can diagnose the faults of one or more photovoltaic cells already mounted in the photovoltaic power station, and also can carry out timed tour inspection, the detection time is short, and the safety of the solar photovoltaic power station system is greatly enhanced.

Description

technical field [0001] The invention relates to a fault detection technology, in particular to a method for online fault detection of photovoltaic cells in a solar photovoltaic power station. Background technique [0002] Solar photovoltaic cells are the basic unit of solar photovoltaic power plants. Whether each solar photovoltaic cell works normally is related to the output efficiency and operation safety of the photovoltaic power plant where it is located. Although the process of solar photovoltaic cells is complex and can adapt to certain environmental changes, its failure and damage are inevitable. Therefore, it is very important to replace the faulty battery in time. The prerequisite for replacement is to correctly diagnose the faulty battery. At present, there is no good method for fault diagnosis of each individual photovoltaic cell in a solar photovoltaic power plant. Contents of the invention [0003] Aiming at the problem that the damage of solar photovoltaic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/26H02S50/10
CPCY02E10/50
Inventor 淡淑恒安帅
Owner 茂盟(上海)工程技术股份有限公司
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