Variable step size photovoltaic MPPT optimization control method based on incremental conductance method

Abstract

The invention relates to a variable-step photovoltaic MPPT optimization control method based on an incremental conductance method. According to the algorithm, the maximum power point of the photovoltaic array is tracked by automatically adjusting the step length through the distance to the MPP, the MPP can be quickly approached by using a large step size when being away from the MPP, and the step size is reduced when the MPP is approached so as to reduce jitter and improve precision until the photovoltaic cell finally runs at the maximum power point. When external illumination and temperature conditions change, the system can effectively track the global maximum power of the photovoltaic module due to the existence of the variable step size algorithm. According to the method, the stability of maximum power point tracking of the photovoltaic system is guaranteed, under the condition that current and voltage output changes are caused by sudden change of illumination and temperature, the tracking stability can still be improved under the condition that the speed is guaranteed, the phenomenon of misjudgment and misreading of maximum power tracking is avoided, and then long-term stable power output of the photovoltaic system is guaranteed.

Description

technical field [0001] The invention relates to the technical field of new energy power generation, in particular to a variable step-size photovoltaic MPPT optimization control method based on the conductance increment method. Background technique [0002] Solar energy is increasingly favored by national strategies due to its safety and easy access. The clean and new renewable energy represented by it is developing into an important part of the sustainable development of the world's new energy strategy. In recent years, the improvement of solar power generation technology, the scale of use, and the continuous expansion of its investment have accelerated the pace of solar power generation technology entering many new fields. But at the same time, due to the material and structure of the photovoltaic cell panel itself, the energy conversion efficiency is not high. Therefore, it is urgent to find out the best working state of the photovoltaic cell, that is, MPP, so that the ph...

AI Technical Summary

Problems solved by technology

[0006] Since INC MPPT has relatively high requirements on hardware, especially the accuracy of sensors, the response speed of each part of the system is required to be relatively fast, and the hardware cost of the entire system will be relatively expensive.

Theoretically speaking, the expression of the conductance incremental method is impeccable, but it is inevitable that when the accuracy of the sensor is limited, the processor will have errors in the calculation of the conductance increment and the instantaneous fixed conductance of the solar panel, so it will not be possible Avoid inaccurate tracking situations

[0007] It can be seen that the existing INC MPPT algorithm has high hardware requirements and complex algorithm implementation

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