Method of measuring series internal resistance of photovoltaic cells under any light intensity and any temperature

Abstract

The invention discloses a method of measuring series internal resistance of photovoltaic cells under any light intensity and any temperature, and belongs to the technical field of new energy power generation. As for the method, according to four standard reference technical parameters of a solar cell, the series internal resistance of the photovoltaic cells under any light intensity and any temperature is measured approximately by introducing corresponding compensation factors. The method comprises the steps that according to the four standard parameters of the solar cell, the series internal resistance of the photovoltaic cells is measured under a standard test condition; the compensation factors corresponding to the four standard parameters are introduced, and four new technical parameters under the solar light intensity and the cell temperature are obtained; the new technical parameters are introduced to the first step, and an estimated value of the series internal resistance of the photovoltaic cells under any light intensity and any temperature is measured. According to the method, an error between the estimated value and an actually measured value is lower than the range of being smaller than 6% required in engineering practice, and the engineering application accuracy requirement can be met well. The method can be applied to theoretical analysis, design and manufacturing of the photovoltaic cells and have good engineering application value.

Description

technical field

[0001] The invention relates to the technical field of new energy power generation, and discloses a method for measuring the series internal resistance of photovoltaic cells under arbitrary light intensity and temperature. Background technique

[0002] The energy structure of today's world is dominated by fossil energy such as coal, oil, and natural gas, and fossil energy is a non-renewable energy that will eventually be exhausted if consumed in large quantities. Solar energy is inexhaustible and inexhaustible, and it is an ideal renewable energy source. The core device of solar photovoltaic power generation is photovoltaic cells, and crystalline silicon photovoltaic cells currently dominate the production, market and application. The upper limit of the theoretical photoelectric conversion efficiency of silicon photovoltaic cells is about 33%, while the conversion efficiency of commercial silicon photovoltaic cells is generally 15% to 20%. The series intern...

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