Maximum power point tracking control method based on kernel partial least squares

Abstract

The invention brings forward a maximum power point tracking control method based on kernel partial least squares. The method includes the steps of determining all factors affecting the output power ofa photovoltaic cell on the basis of the photoelectric conversion characteristics of the photovoltaic cell; collecting actual running data and corresponding maximum power point voltage of the photovoltaic cell, and obtaining a training set sample and a predication set sample; performing regression fitting on the training set sample through a kernel partial least squares regression algorithm, establishing a nonlinear relation between an input variable and the maximum power point voltage, taking the predication set sample as the input of the kernel partial least squares algorithm, and taking theoutput of the kernel partial least squares regression algorithm as a predication value of the maximum power point voltage; and dynamically adjusting the working voltage of the photovoltaic cell to bethe predication value of the maximum power point voltage, and enabling the photovoltaic cell to work at the maximum power point. The method enables the photovoltaic cell to always work at the maximumpower point.

Description

technical field [0001] The invention belongs to the field of smart grids, and in particular relates to a maximum power point tracking control method based on nuclear partial least squares. Background technique [0002] Since the 21st century, the energy crisis has intensified, fossil fuels are facing depletion, and the environmental pollution and greenhouse effect caused by them have become huge problems facing mankind, so people turn to other renewable energy sources. Photovoltaic power generation has won people's favor due to its advantages such as green and pollution-free, simple power generation device process, and no noise. [0003] The basic component of photovoltaic power generation is the photovoltaic cell, which converts light energy directly into electricity through the photovoltaic effect. Photovoltaic cells are made of crystalline silicon, which is expensive to manufacture. Since the output voltage and output current of photovoltaic cells change with the extern...

AI Technical Summary

Problems solved by technology

The constant voltage method ignores the influence of temperature on the output power, and the actual photovoltaic cell does not work at the maximum power point; the disturbance and observation method constantly introduces disturbances, and the photovoltaic cell always fluctuates near the maximum power point; Difficulty in choosing step size

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