Local shadow photovoltaic array MPPT control method based on optimization algorithm of molecular kinetic theory

Abstract

The invention discloses a local shadow photovoltaic array MPPT control method based on an optimization algorithm of the molecular kinetic theory. Output current of a photovoltaic array serves as particles of the algorithm, the power of the photovoltaic array serves as an algorithm fitness function, and through the novel and rapid overall search technology, namely the optimization algorithm of the molecular kinetic theory, the maximum power point of the overall photovoltaic array is efficiently and accurately found out, the voltage of the maximum power point is output through the algorithm, the difference value between the voltage of the maximum power point and the actual output voltage of the photovoltaic array is obtained, a Boost circuit is controlled through a PWM module, and tracking of the maximum power point is achieved. The problem that under the local shadow condition, the photovoltaic array MPPT control having multi-peak output characteristics is easy to fall into interference of local maximum power points, the overall maximum power point can be accurately found out, tracking speed is high, and steady-state oscillation is small.

Description

technical field [0001] The invention relates to a method for controlling MPPT of a partially shaded photovoltaic array, in particular to an MPPT control method for partially shaded photovoltaic arrays based on molecular dynamic theory optimization algorithms. 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 conductance method, et...

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Problems solved by technology

[0004] Purpose of the present invention: To solve the problem of the existing control technology of photovoltaic array MPPT under partial shadow, to propose a partial shadow photovoltaic array MPPT control based on molecular dynamic theory optimization algorithm with few adjustment parameters, fast search speed, accurate and stable search results method

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