Compound control method of photovoltaic maximum power point tracking on condition of partial shadow

Abstract

The invention relates to a compound control method of photovoltaic maximum power point tracking on the condition of partial shadow. The method includes the following steps: (1) obtaining an output voltage and output current data array of a photovoltaic array on the condition of the partial shadow; (2) adopting particle swarm optimization to search an initial maximum power working point according to the voltage and current data array; (3) obtaining a corresponding initial duty ratio according to the initial maximum power working point searched by the particle swarm optimization; (4) adopting a self-adaption perturbation and observation method to carry out variable-step duty ratio disturbance control according to the initial duty ratio, and outputting an obtained final duty ratio control signal to a maximum power point control circuit; and (5) according to the final duty ratio control signal, the maximum power point control circuit controlling the photovoltaic array to work and enabling the photovoltaic array to stably work at the maximum power point. Compared with in the prior art, the compound control method of the photovoltaic maximum power point tracking on the condition of the partial shadow has the advantages of being high in searching accuracy, suitable for the photovoltaic maximum power point tracking on the condition of the partial shadow and the like..

Description

technical field [0001] The invention relates to a photovoltaic power generation maximum power tracking method, in particular to a composite control method for photovoltaic maximum power point tracking under partial shade conditions. Background technique [0002] It is very common for photovoltaic arrays to be shaded in modern cities. For residential photovoltaic power generation systems, due to the special location and environment where photovoltaic arrays are installed, the problem of partial shadowing is particularly prominent. Under partial shadow conditions, due to the appearance of multiple extreme points on the output power characteristic curve, conventional MPPT (Maximum PowerPoint Tracking, maximum power point tracking) algorithms (such as P&O, InCond, etc.) may converge to a certain power extreme value point, rather than the maximum power point, so that maximum power tracking in the true sense cannot be achieved. At this time, the energy of the photovoltaic array is...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a composite control method for photovoltaic maximum power point tracking under partial shadow conditions, which has high search accuracy and effectively solves the control problem of photovoltaic arrays under partial shadow conditions in order to overcome the above-mentioned defects in the prior art.

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