Photovoltaic maximum power tracing system and method based on P-U curvature characteristics

Abstract

The invention discloses a photovoltaic maximum power tracing system and method based on P-U curvature characteristics. The method includes the following steps: sampling the output voltage and the output current of a photovoltaic cell panel in real time; calculating curvature changes corresponding to P-U curves output by the photovoltaic cell panel in real time; determining the duty ratio change direction of a Boost circuit in the next step according to the direction of the curvature changes and the direction of changes of the voltage output by the photovoltaic cell panel; sending the adjusted duty ratio to the Boost circuit to control the output voltage of the photovoltaic cell panel to be adjusted in the maximum power output direction. By means of the photovoltaic maximum power tracing system and method, the tracing direction is determined with the method of calculating the curvature increments of the P-U curves output by the photovoltaic cell panel in real time, maximum power point tracing of a photovoltaic cell is achieved, the response speed is high, rapid tracing control is easily achieved, and the photovoltaic maximum power tracing system and method are suitable for areas with the high external environmental change speeds; in addition, shocks nearby the maximum power point are small, and power losses nearby the maximum power point are fewer.

Description

technical field [0001] The invention relates to a photovoltaic maximum power tracking system and method, in particular to a photovoltaic maximum power tracking system and method based on P-U curvature characteristics. Background technique [0002] With the deployment of photovoltaic power generation systems around the world, many problems have gradually been exposed in photovoltaic power generation systems. The more prominent problems are: the price of photovoltaic panels is still high, which makes the investment cost of photovoltaic power generation systems relatively high. (2) The working efficiency of the photovoltaic cell is low, and the photovoltaic cell cannot fully exert its performance. [0003] Under the existing conditions, the price of photovoltaic cells cannot be greatly reduced. The only way to make full use of solar energy is to improve the efficiency of photovoltaic cells as much as possible. This requires a good control algorithm, especially the photovoltaic...

AI Technical Summary

Problems solved by technology

The more prominent problems are: the price of photovoltaic panels is still high, which makes the investment cost of photovoltaic power generation system relatively high

(2) The working efficiency of photovoltaic cells is low, and photovoltaic cells cannot fully exert their performance

But at the same time, the conductance incremental method also has its disadvantages, such as the required detection circuit has high precision, and the controller requires fast operation speed, etc.

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