Power closed-loop scanning-based maximum power point tracking method for multiple peak values of photovoltaic array

Abstract

The invention discloses a power closed-loop scanning-based maximum power point tracking (MPPT-Maximum Power Point Tracking) method for a plurality of peak values of a photovoltaic array. The power closed-loop scanning-based maximum power point tracking method comprises three stages: firstly, realizing global scanning of a multi-peak value curve on the basis of power closed-loop control, and completing the positioning of a maximum powder point; secondly, performing a three-point synergetic variable-step length disturbance observation process on the basis of a particle swarm optimization algorithm, and performing local searching near the maximum power point; thirdly, performing a fixed voltage steady state tracking process, and meanwhile, activating the processes of the first stage or the second stage according to judgment of environmental change information. According to the method, tracking of the maximum power point of the photovoltaic array can be realized in single-peak or multi-peak situations; the problems of misjudgment and vibration of a disturbance observation method and a conductance increment method are avoided; and meanwhile, the problems that the gradual dynamic tracking function loss is great and the dynamic process is slow in the conventional method can be solved. By the method, the global maximum power point can be effectively searched; quick, stable and accurate tracking of the maximum power point is realized.

Description

technical field [0001] The invention belongs to photovoltaic power generation technology in the field of electrical engineering, and in particular relates to a maximum power point tracking control (MPPT—Maximum Power Point Tracking) method of a photovoltaic array in a photovoltaic power generation system under uneven illumination conditions. Background technique [0002] As a renewable energy source, solar energy has the advantages of being widely distributed, sustainable, and non-polluting. Photovoltaic power generation technology is one of the basic ways to effectively utilize solar energy resources. At present, various photovoltaic power generation technologies, including photovoltaic grid-connected, have received strong support from governments of various countries. [0003] Although photovoltaic power generation technology has good application prospects, as a relatively new technology, it still faces many problems to be solved, one of which is the shadow shading proble...

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Problems solved by technology

[0016] The technical problem to be solved by the present invention is to provide a fast and stable track-to Global maximum power point under multi-peak conditions, in order to improve the power generation efficiency of photovoltaic arrays, a multi-peak maximum power point tracking method for photovoltaic arrays based on power closed-loop scanning

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