Local shadow photovoltaic array MPPT control based on random leapfrog global search algorithm

Abstract

The invention discloses a local shadow photovoltaic array multi-peak maximum power point tracking (MPPT) control method based on a random leapfrog global search algorithm. Output current of a photovoltaic array is adopted as particles of the algorithm, power of the photovoltaic array is adopted as an adaptability function of the algorithm, on the basis of the novel, fast and global search technology of the random leapfrog global search algorithm, the global maximum power point of the photovoltaic array can be efficiently and accurately found, and then maximum power point tracking is achieved through a fuzzy PI control Boost circuit. The algorithm can solve the problem that under local shadow, the photovoltaic array MPPT control with multi-peak output characteristics is likely to be sunkeninto the local maximum power point, the global maximum power point can be accurately found, and the method is high in optimizing capability, high in search precision and capable of programmably implemented easily.

Description

technical field [0001] The invention relates to a multi-peak MPPT control method for a partially shadowed photovoltaic array, in particular to a multi-peak MPPT control method for a partially shadowed photovoltaic array based on a random leapfrog global search algorithm. Background technique [0002] With the popularization of solar power generation, the operating environment of photovoltaic arrays has become more and more complex. Partial shading causes multiple extreme points in the output characteristic curve of photovoltaic arrays, which affects the output efficiency of photovoltaic arrays, and even damages them due to hot spots. PV. In order to make the photovoltaic system work at the maximum power point and improve system efficiency, it is necessary to use an effective multi-peak maximum power point tracking algorithm. [0003] Traditional maximum power point tracking algorithms (such as fixed voltage method, perturbation and observation method, incremental conductanc...

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