A Selection Method of Optimal External Series Resistance for Solar Cells Used in Irradiation Sensors

A technology of solar cells and series resistors, applied in the field of photovoltaic systems, can solve problems such as the inability to reflect the influence of radiation spectrum differences on photovoltaic power generation, and achieve the effect of ensuring accuracy

Inactive Publication Date: 2018-06-05
HOHAI UNIV CHANGZHOU
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Problems solved by technology

The calculation of radiation intensity for photovoltaic efficiency evaluation is mainly realized by solar radiation sensors. One is composed of combined thermopile circuits, which can accurately reflect the radiation intensity, but cannot reflect the impact of radiation spectrum differences on the arrival of photovoltaic power generation.

Method used

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  • A Selection Method of Optimal External Series Resistance for Solar Cells Used in Irradiation Sensors
  • A Selection Method of Optimal External Series Resistance for Solar Cells Used in Irradiation Sensors
  • A Selection Method of Optimal External Series Resistance for Solar Cells Used in Irradiation Sensors

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Embodiment Construction

[0029] The present invention will be further described in detail in conjunction with the accompanying drawings and specific embodiments.

[0030] like Figure 4 As shown, on the volt-ampere characteristic curve of the solar cell, when the load resistance R L for a certain value R m , get a point M on the curve, so that the corresponding operating current I m and working voltage U m The product (power) of is the largest, then the I at this time m is the best working current, U m For the best working voltage, R m is the best load resistance.

[0031] in,

[0032]

[0033] Among them, I ph is the photogenerated current of the solar cell; I 0 is the pre-exponential factor related to the dark current; q is the unit charge; A is the diode factor; k is the Planck constant; T is the absolute temperature of the PN junction of the solar cell.

[0034] Coefficient I 0 , A, k, T are determined by the structure of the solar cell itself.

[0035]

[0036] In the prior ar...

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Abstract

The invention discloses a method for selecting an optimal external series resistor of a solar cell for an irradiation sensor. The method can guarantee the linear relation between different irradiation intensities and corresponding currents under the condition that an I-V curve of the solar cell does not need to be tested, thereby guaranteeing the accuracy of a testing value of one type of irradiators which take a solar cell panel as a sensor. For one type of cell panels, the method just needs an open-circuit voltage Uoc and a short-circuit current Isc under the standard testing conditions, selects a resistor with a resistance value R (within the range shown in the description) as a series resistor of the solar cell panel, and guarantee the linear relation between the irradiation intensities and the currents within a certain precision range.

Description

technical field [0001] The invention relates to a method for selecting an optimal external series resistance of a solar cell for an irradiation sensor, and belongs to the technical field of photovoltaic systems. Background technique [0002] With the development of photovoltaic systems, the evaluation of photovoltaic efficiency is particularly important. Photovoltaic system efficiency generally refers to the ratio of actual power generation output to the total amount of radiation reaching the surface of the photovoltaic array. Accurate and rapid measurement of radiation is crucial to the evaluation of photovoltaic system efficiency. The calculation of radiation intensity for photovoltaic efficiency evaluation is mainly realized by solar radiation sensors. One is composed of combined thermopile circuits, which can accurately reflect radiation intensity, but cannot reflect the impact of radiation spectrum differences on photovoltaic power generation. The other uses solar cell...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J1/42
CPCG01J1/42
Inventor 郭晓晗张臻祝曾伟吴军王宁
Owner HOHAI UNIV CHANGZHOU
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