Multi-peak photovoltaic maximum power point tracking control method used under partially-shaded condition

Abstract

The invention discloses a multi-peak photovoltaic maximum power point tracking control method used under the partially-shaded condition. The method comprises steps as follows: photovoltaic cells are connected in series and in parallel to form a photovoltaic array, and a mathematical model of the photovoltaic array under the partially-shaded condition is established; a double-peak P-V and I-V output characteristic curve of the photovoltaic array under the shading condition is obtained according to the established mathematical model; the established mathematical model is take as an objective function, an improved fruit fly optimizing method is used for optimization, and the maximum power point of the photovoltaic array is sought out. The convergence rate during seeking of an optimal value of a multi-peak function is very quick with the improved fruit fly optimizing method, the condition that misjudgment is caused due to local maximum is avoided, and the maximum power point of the photovoltaic array is rapidly and accurately obtained.

Description

Technical field [0001] The invention relates to a photovoltaic maximum power tracking control method, in particular to a multi-peak photovoltaic maximum power tracking control method under partial shadow. Background technique [0002] With the widespread application of photovoltaic power generation systems around the world, photovoltaic power generation systems have gradually exposed many problems, among which the more prominent problems are mainly the low efficiency of photovoltaic cells, which cannot fully exert their effectiveness. To solve these problems, a good control algorithm is needed, especially the photovoltaic maximum power tracking control algorithm. Through the photovoltaic maximum power tracking control algorithm, the photovoltaic cell can always work at the maximum power point to achieve the maximum output of power and improve the efficiency of the entire system. The traditional methods of tracking a single peak point include: intermittent scanning method, distur...

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Problems solved by technology

Traditional methods for tracking a single peak point include: intermittent scanning method, disturbance observation method, conductance incremental method, constant voltage tracking, fuzzy control method, dynamic impedance matching method, optimal gradient method, short-circuit current combined with disturbance observation method, etc. However, the above The method has failed for multi-peak photovoltaic maximum power tracking under partial shadow

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