Parameter Estimation Method for Photovoltaic Modules Based on Adaptive lm

Abstract

A method for estimating photovoltaic module parameters based on adaptive LM. According to the single-diode equivalent model of photovoltaic modules, the multi-parameter analytical formula of photovoltaic modules is derived; the sensitivity analysis method is used for parameter screening, and the I‑V output characteristic curve extracted from the experiment is combined , establish a parameter optimization model; use the adaptive LM algorithm to solve multiple parameters of photovoltaic modules. This method can more comprehensively describe the working state and performance of the component. Based on the sensitivity analysis, the parameters that have little or no influence on the I-V characteristic curve in the multi-parameter model are identified, and the parameters after removing these parameters are reserved as the parameters to be estimated for single-diode photovoltaic modules, which are extracted by combining experiments under different working conditions Based on the obtained I-V output characteristic curve, a parameter optimization model is established, and multiple parameters of photovoltaic modules are solved by the adaptive Levenberg-Marquardt method.

Description

technical field [0001] The invention relates to a technology in the field of photovoltaic component detection, in particular to a photovoltaic component parameter estimation method based on adaptive LM. Background technique [0002] In the prior art, the PV module's I-V characteristic curve is generally calculated by using the module parameters calculated from the data provided by the manufacturer under standard operating conditions in combination with the single-diode five-parameter model, so as to estimate the output of the PV module. However, with the aging of photovoltaic modules, their internal parameters will change, and only relying on the parameters obtained from the data provided by the manufacturer under standard operating conditions to estimate the I-V curve of the photovoltaic in actual operation will affect the accuracy of the prediction results; The parameters in the diode five-parameter model will vary with the photovoltaic backplane temperature and irradiance...

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Problems solved by technology

However, with the aging of photovoltaic modules, its internal parameters will change, and only relying on the parameters obtained from the data under standard working conditions provided by the manufacturer to estimate the I-V curve of photovoltaics in actual operation will affect the accuracy of the prediction results; The parameters in the five-parameter model of the diode will vary with the temperature and irradiance of the photovoltaic backplane. The model using the five parameters is not detailed enough to fully reflect its characteristics; Under working conditions, the common use of I-V curves of components measured under standard working conditions to estimate component parameters is not industrially applicable

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