Maximum power point determination method, maximum power point determination device and computer readable storage medium

Abstract

The invention discloses a maximum power point determination method, and the method comprises the following steps: acquiring open circuit voltage of a photovoltaic component, calculating a voltage lower limit value and a voltage upper limit value corresponding to a to-be-determined maximum power point according to the open circuit voltage; regulating actual output voltage of the photovoltaic component to the voltage lower limit value, taking the voltage lower limit value as a start point, controlling the actual output voltage of the photovoltaic component to increase progressively according toa preset step length, and calculating corresponding photovoltaic output power after each progressive increase, until realizing that the actual output voltage is increased to the voltage upper limit value; comparing the photovoltaic output power obtained in the actual output voltage progressive increase process, taking a maximum value in the photovoltaic output power as the maximum power point of the photovoltaic component. The invention also discloses a maximum power point determination device and a computer readable storage medium. With the method, the device and the computer readable storagemedium, the maximum power point of the photovoltaic component can be determined quickly and accurately.

Description

technical field [0001] The present invention relates to the technical field of photovoltaic power generation, in particular to a method, device and computer-readable storage medium for determining a maximum power point. Background technique [0002] Photovoltaic power generation system refers to a power generation system that directly converts light energy into electrical energy without going through a thermal process. The system mainly includes photovoltaic modules, batteries, controllers and inverters. Among them, the output of photovoltaic modules has nonlinear characteristics, and the output power is affected by factors such as light intensity, temperature and load. Due to the low conversion efficiency of photovoltaic modules, it is important to make photovoltaic modules work at the maximum power point to improve efficiency. Therefore, maximum power point tracking is a necessary measure for photovoltaic power generation systems. [0003] In the prior art, common maximum...

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Problems solved by technology

Among them, the perturbation-and-observation method has been widely used due to the advantages of simple algorithm, easy implementation, irrelevance to the electrical characteristic parameters of photovoltaic modules, and high tracking efficiency, but there are certain defects in using the perturbation-and-observation method: The maximum power point can only be found by global disturbance, which leads to slow initial tracking speed and low overall tracking efficiency; (2) When the external environment changes rapidly, it is easy to fall into local optimum and misjudge the maximum power point, resulting in a relatively large loss. Large power, lower power generation efficiency

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