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Irradiance calculation method based on voltage at two ends of load of photovoltaic cell

A photovoltaic cell and voltage calculation technology, applied in the field of photovoltaic systems, can solve the problem of large calculation error of the irradiance linear model

Inactive Publication Date: 2016-10-26
HOHAI UNIV CHANGZHOU
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the defects of the prior art, provide a method for calculating irradiance based on the voltage at both ends of the photovoltaic cell load, and solve the problem of large calculation errors in the linear model of irradiance, thereby accurately predicting the power generation

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  • Irradiance calculation method based on voltage at two ends of load of photovoltaic cell

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[0030] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0031] Such as figure 1 As shown, the method of the present invention first obtains the relationship between the voltage at both ends of the load and the short-circuit current through the output characteristics of the solar cell, in combination with the relationship between the voltage and current at both ends of the load and the approximate view that the photogenerated current is equal to the short-circuit current, and uses the performance parameters of the solar cell to determine the formula performance parameters. Further use the open circuit voltage exposed to the sun and ambient temperature to calculate the temperature of the silicon cell, and combine the irradiance and the voltage across ...

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Abstract

The invention discloses an irradiance calculation method based on a voltage at two ends of a load of a photovoltaic cell. A relationship between a voltage at two ends of the load and a short circuit current is obtained according to output features of a solar cell, through combination of a relationship between the voltage and current at two ends of the load, and the fact that a photo-generated current is approximately considered to be equal to the short circuit current; performance parameters in a formula are determined by employing performance parameters of the solar cell; calculation is carried out by employing open circuit voltages exposed to sunlight and environment temperature, thereby obtaining the temperature of a silicon wafer cell piece; and a relationship between the voltage at two ends of the load and irradiance is obtained through combination of the irradiance and the voltage at two ends of the load. According to the method, the accurate irradiance can be obtained by employing the voltage at two ends of the load through calculation; and the generating capacity can be predicted accurately.

Description

technical field [0001] The invention relates to a method for calculating irradiance based on the voltage at both ends of a photovoltaic battery load, and belongs to the technical field of photovoltaic systems. Background technique [0002] With the increasing depletion of non-renewable energy sources, renewable energy sources such as water energy, wind energy, and solar energy have attracted much attention. With the development of photovoltaic systems, the measurement of system efficiency has been widely studied as an important factor in calculating the performance of solar cells, and the calculation accuracy of irradiance is one of its influencing factors. Existing irradiance calculation models believe that the working current of photovoltaic cells has a linear relationship with irradiance, and all use the output performance relationship of photovoltaic cells ignoring the internal series resistance to derive the short-circuit current and then calculate the irradiance. In f...

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Application Information

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IPC IPC(8): H02S50/00H02S50/10
CPCH02S50/00H02S50/10Y02E10/50
Inventor 蔡一凡张臻吴军邵玺郑文博
Owner HOHAI UNIV CHANGZHOU
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