A device and method for online measurement and evaluation of electrical parameters of solar panels

Abstract

The invention discloses an online measurement and evaluation device and method for electrical parameters of a solar cell panel. The five electrical parameters of photo-generated current, reverse saturation current, series resistance, parallel resistance and diode quality factor of the solar cell panel are accurately obtained in real time by an online calculation method based on multi-parameter grid search and Damped-Newton for monitoring the port voltage and current of the solar panel in a power generation state. According to the online measurement and evaluation device and method, the parameters of maximum power in a rated state, voltage and current of a maximum power point, short-circuit current and open-circuit voltage provided by manufacturers do not need to be used, and the circuit and mathematical models of the solar cell panel do not need to be simplified; the required five electrical parameters can be accurately calculated by actual measurement data; a principle is simple; a physical mathematical process is clear; the calculation method designed by the invention is short in calculation response time, high in precision and capable of calculating the electrical parameters on line; the effective method is provided for accurate circuit model building, state prediction and the like of a solar cell.

Description

technical field [0001] The invention belongs to the technical field of solar cell panels, and in particular relates to an online measurement and evaluation device and method for electrical parameters of a solar cell panel. Background technique [0002] With the increasing tension of fossil energy such as coal, oil and natural gas and the aggravation of environmental pollution, solar power generation has become the focus of research in various countries due to its clean, pollution-free and inexhaustible characteristics, and is considered to be the most renewable energy. One of the potential power generation methods. Solar panels are the core components of solar power plants, so it is necessary to study and establish accurate and reliable solar cell models. The five electrical parameters of solar panels, including photogenerated current, reverse saturation current, series resistance, parallel resistance, and diode quality factor, are the basis for accurately establishing a so...

AI Technical Summary

Problems solved by technology

The existing methods of measuring the electrical parameters of solar panels are all measured offline, obtained through simplified analytical calculations, the accuracy is not high, the process is complicated, and it cannot meet the online parameter measurement of solar panels, and it is not proposed to use the electrical parameters obtained by online measurement. A method for evaluating power generation status, while lacking an online electrical parameter measurement device for solar panels

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