Solar photovoltaic maximum power tracking control method

Abstract

The invention discloses a solar photovoltaic maximum power tracking control method. The solar photovoltaic maximum power tracking control method comprises the following steps that step 1, maximum power tracking is carried out by adopting a variable step perturbation observation method; step 2, after entering a parabola fitting region R, a maximum power point is tracked and determined according toa parabola approximation method; step 3, according to the change of the external environment, the step length is adjusted in real time, the size of the step length is changed dynamically, and maximumpower tracking control is carried out. The solar photovoltaic maximum power tracking control method has the advantages that the position of a working point of a solar photovoltaic system is judged byadopting the perturbation observation method; firstly, it is judged whether or not fitting voltage enters the fitting region R and satisfies fitting conditions, finally, a parabola curve equation is obtained, the voltage and maximum power of the maximum power point are solved, the method eliminates the occurrence of oscillation and misjudgment of a traditional algorithm near the maximum power point, so that a system can accurately track the maximum power, the response time is short, the oscillation is small, and the dynamic error is also smaller.

Description

technical field [0001] The invention belongs to the technical field of solar cells, and in particular relates to a solar photovoltaic maximum power tracking control method. Background technique [0002] Solar photovoltaic power generation system refers to a power generation system that directly converts light energy into electrical energy without going through a thermal process. With the increasingly serious energy problems, photovoltaic power generation technology has developed rapidly. [0003] The output power of solar cells is related to light intensity, temperature, and load conditions. There is a unique maximum power point (MPP) under certain light intensity, temperature, and load conditions. In order to improve its power generation efficiency and efficiently use photovoltaic cells, it is necessary to perform maximum power tracking on photovoltaic arrays. At present, there are many methods of maximum power tracking technology commonly used, such as constant voltage m...

AI Technical Summary

Problems solved by technology

This method can automatically adjust the step size according to the change of the external environment, and the system always runs at the maximum power point, which overcomes the problems of slow startup of the traditional variable step size algorithm and slow dynamic response when the light changes drastically.

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