INVERSE LEST SQUARES IDENTIFICATION OF THIN FILM SOLAR CELL PARAMETERS BASED ON BEZIER CURVES

Zhu Xianhui; Gao Bin; Shi Nan; Zhu Xiaoqiang; Zhong Jingwen

doi:10.19912/j.0254-0096.tynxb.2022-0142

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Acta Energiae Solaris Sinica ›› 2023, Vol. 44 ›› Issue (6) : 204-212. DOI: 10.19912/j.0254-0096.tynxb.2022-0142

INVERSE LEST SQUARES IDENTIFICATION OF THIN FILM SOLAR CELL PARAMETERS BASED ON BEZIER CURVES

Zhu Xianhui¹, Gao Bin¹, Shi Nan^2,3, Zhu Xiaoqiang¹, Zhong Jingwen¹

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Abstract

Aiming at the drawbacks of tedious solving of photovoltaic parameters, low accuracy and need for experimental testing, a method of identifying parameters of thin film cells using a combination of two second-order Bezier curves and the inverse least squares method is proposed. Firstly, a parallel line is constructed through the maximum power point and parallel to the line connecting the open-circuit voltage point and the short-circuit current point, and the best control point of the two second-order Bezier functions is found on the parallel line. And then the linear law of the control position and the filling factor of the thin-film cell is obtained to achieve a simple and accurate portrayal of the I-V curve. Thirdly, the output characteristic transcendence equation of the thin-film cell is simplified by using the equivalent transformation, and the Five new variables are introduced to transform the transcendental equation into an algebraic equation, five points on the Bezier curve are randomly selected, and the values of the five variables are given by algebraic calculation and （pseudo-）solution of Euclidean parametrization, and the five parameters of the transcendental equation are solved backwards by inverse least squares method using the obtained variable results. Finally, the parameters and solution times under different operating conditions are compared and analyzed for five different types of thin-film cells to verify the rapidity, accuracy and applicability of the method.

Key words

solar cell / parameter identification / thin film solar cell / Bezier function / inverse least squares method

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Zhu Xianhui, Gao Bin, Shi Nan, Zhu Xiaoqiang, Zhong Jingwen. INVERSE LEST SQUARES IDENTIFICATION OF THIN FILM SOLAR CELL PARAMETERS BASED ON BEZIER CURVES[J]. Acta Energiae Solaris Sinica. 2023, 44(6): 204-212 https://doi.org/10.19912/j.0254-0096.tynxb.2022-0142

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