A Modeling Method of Photovoltaic Cell Output Characteristics Based on Bezier Function

Abstract

The invention discloses a photovoltaic cell output characteristic modeling method based on a Bezier function. The method comprises the steps of S1, establishing a rectangular plane coordinate system, determining the positions of a short-circuit current point, a maximum power point and an open-circuit voltage point in the rectangular plane coordinate system, and determining the positions of two control points of the Bezier function in the rectangular plane coordinate system according to the positions of the short-circuit current point, the maximum power point and the open-circuit voltage point; S2, determining the coordinates of points, located on the left side and right side of the maximum power point, on the Bezier function curve according to the positions of the short-circuit current point, the maximum power point, the open-circuit voltage point and the two control points; S3, drawing a Bezier fitted curve. According to the method, photovoltaic cell output characteristic modeling can be achieved simply based on the parameters including short-circuit current, maximum power point and open-circuit voltage given by a manufacturer by means of the piecewise second-order Bezier function.

Description

technical field [0001] The invention relates to a modeling method, in particular to a modeling method for output characteristics of photovoltaic cells based on Bezier functions. Background technique [0002] Photovoltaic power generation has shown a vigorous development trend in recent years due to its green and environmental protection advantages. Constructing the relationship curve between the output current I and voltage U of photovoltaic cells under standard operating conditions is a necessary prerequisite for the study of photovoltaic technology. [0003] The mathematical model of a photovoltaic cell is a transcendental equation including multiple unknown quantities such as photogenerated current, reverse dark current, diode ideality factor, series resistance, parallel resistance, etc., which has the following form: [0004] [0005] In the formula, I is the battery output current; U is the battery terminal voltage; I L is the photogenerated current; A is the diode...

AI Technical Summary

Problems solved by technology

However, this method needs to use an iterative method to solve the I-U transcendental equation, and the iterative method has problems such as the reasonable selection of the initial value and whether the iteration converges; For the battery model, the optimization algorithm can be used to improve the accuracy, but it also increases the complexity of the model and the difficulty of solving it

The above studies all involve relatively complex mathematical operations or optimization algorithms, which makes modeling of photovoltaic cells more difficult and limits the promotion and application of photovoltaic cell modeling methods in engineering practice.

Images