CN-121727501-B - Retired photovoltaic module performance evaluation method and system

CN121727501BCN 121727501 BCN121727501 BCN 121727501BCN-121727501-B

Abstract

The invention discloses a performance evaluation method and system for retired photovoltaic modules, which relate to the technical field of photovoltaic module detection and comprise the steps of obtaining a surface dry state baseline of a retired photovoltaic module, configuring an acquisition channel, performing power output test under the condition of meeting working condition stability, acquiring voltage and current, obtaining maximum power and filling factors, performing irradiance and temperature normalization on power data to generate power data with a time stamp and working condition fields, performing insulation pressing test through a damp-heat trigger factor on the premise of keeping the installation posture and grounding condition unchanged, generating insulation data bound with the time stamp of the power data, and performing joint criterion calculation on the power data and the insulation data to obtain a performance evaluation grade, thereby realizing collaborative evaluation on the output capacity and the electrical safety state of the retired photovoltaic module.

Inventors

TANG XI
WANG QUAN
HU JINWEN

Assignees

江苏苏北废旧汽车家电拆解再生利用有限公司

Dates

Publication Date: 20260508
Application Date: 20260210

Claims (8)

1. A performance evaluation method for retired photovoltaic modules is characterized by comprising the steps of, Under the condition that the installation posture, the clamping position and the frame grounding condition of the retired photovoltaic component to be evaluated are consistent, a surface dry state baseline is obtained, and an acquisition channel is synchronously configured and initialized; under the condition of meeting the stable working condition, performing power output test on the retired photovoltaic component, collecting voltage and current, and obtaining the maximum power and the filling factor; Normalizing the power output data according to irradiance and temperature to generate power data with a time stamp and a working condition field; on the premise of keeping the installation posture and the grounding condition unchanged, forming a damp-heat state on the back plate of the retired photovoltaic module through a damp-heat trigger factor, carrying out insulation pressing test on the retired photovoltaic module, continuously collecting leakage current change, calculating dynamic insulation characteristic parameters, and generating insulation data bound with a power data timestamp; When the power data and the insulation data meet the conditions of time stamp binding and working condition consistency, carrying out joint criterion calculation on the power data and the insulation data to obtain a comprehensive evaluation value, and generating a performance evaluation grade of the retired photovoltaic module to be evaluated; the wet-heat trigger factor is formed by applying wet state to the outer surface of the retired photovoltaic module and maintaining the superimposed thermal state, so that the retired photovoltaic module backboard is in a wet-heat state under the conditions of wet state consistency and temperature stability, and insulation pressing test is executed under the wet-heat state to obtain dynamic insulation characteristic parameters; The implementation of insulation pressing test on the retired photovoltaic module through the damp-heat trigger factor comprises the steps of humidifying the outer surface of the retired photovoltaic module backboard under the condition that the installation posture, the clamping mode and the grounding condition of the retired photovoltaic module are kept unchanged, so that a wet state coverage state is formed; heating the retired photovoltaic module backboard after the wet coverage state is formed, so that the module backboard is in a wet and hot triggering working condition; Under the wet and hot triggering working condition, applying insulation test voltage to the retired photovoltaic module, continuously collecting leakage current data in the pressing process, and calculating dynamic insulation parameters based on the test voltage and the leakage current; the dynamic insulation parameters include a minimum insulation resistance within the hold phase, a steady state insulation resistance of the hold phase tail, a leak conductance integral feature of the hold phase, a spike count of the hold phase, and a dynamic decay constant of the hold phase.
2. The method for evaluating the performance of the retired photovoltaic module according to claim 1, wherein the step of obtaining the surface dry state baseline comprises the steps of performing nondestructive cleaning treatment on the retired photovoltaic module to enable the front surface and the back surface of the retired photovoltaic module to be in a dry stable state; And acquiring a surface dry state baseline representing the electrical state of the back plate surface of the retired photovoltaic module at a sampling position based on the dry stable state.
3. The method for evaluating the performance of the retired photovoltaic module according to claim 1, wherein configuring the collection channels comprises configuring irradiance collection channels and temperature collection channels before performing power output testing on the retired photovoltaic module; the initialization comprises the steps of correcting the collected irradiance data and temperature data based on channel calibration factors of the irradiance collection channel and the temperature collection channel, and obtaining corrected irradiance and corrected temperature.
4. The method for evaluating the performance of a retired photovoltaic module according to claim 1, wherein said meeting operating condition stabilizing conditions includes performing stability determination for corrected irradiance and corrected temperature within a time window, and determining the time window as a power test window when both irradiance changes and temperature changes meet stability thresholds.
5. The method for evaluating the performance of the retired photovoltaic module according to claim 3, wherein the step of performing power output testing on the retired photovoltaic module comprises the steps of collecting voltage and current data of the retired photovoltaic module, and calculating and obtaining maximum power, open circuit voltage, short circuit current and filling factors based on the collected voltage and current; and the maximum power and the filling factor are used as characterization parameters of the power output capacity of the retired photovoltaic component.
6. The method for evaluating the performance of the retired photovoltaic module of claim 1 wherein normalizing the power output data based on irradiance and temperature includes correcting the measured maximum power to a standard reference irradiance and a standard reference temperature based on an average irradiance and an average temperature within a power test window to obtain normalized power data.
7. The retired photovoltaic device performance evaluation method of claim 5 wherein performing joint criteria calculation on power data and insulation data includes combining normalized power data, fill factors, and dynamic insulation parameters; and calculating the comprehensive evaluation index based on the combination, and generating the performance evaluation grade of the retired photovoltaic component according to the comprehensive evaluation index and the grade classification rule.
8. The retired photovoltaic module performance evaluation system based on the retired photovoltaic module performance evaluation method of any one of claims 1-7 is characterized by comprising an initialization module, a power output module, a power normalization module, an insulation test module and a joint criterion module; the initialization module is responsible for acquiring a surface dry state baseline of the retired photovoltaic component to be evaluated, configuring an acquisition channel and initializing; The power output module is responsible for carrying out power output test on the retired photovoltaic component under the condition of meeting the stable working condition, collecting voltage and current, and obtaining the maximum power and the filling factor; The power normalization module is in charge of normalizing the power output data according to irradiance and temperature to generate power data with a time stamp and a working condition field; The insulation test module is responsible for implementing insulation pressing test on the retired photovoltaic module through a damp-heat trigger factor, continuously collecting leakage current change, calculating dynamic insulation characteristic parameters and generating insulation data bound with the power data timestamp; And the combined criterion module is responsible for carrying out combined criterion calculation on the power data and the insulation data to generate a performance evaluation grade of the retired photovoltaic component to be evaluated.

Description

Retired photovoltaic module performance evaluation method and system Technical Field The invention relates to the technical field of photovoltaic module detection, in particular to a performance evaluation method and system for retired photovoltaic modules. Background The method comprises the steps of continuously expanding the installed scale of the photovoltaic power generation, gradually entering a retired stage of the photovoltaic module which is put into operation in early stage, aiming at performance evaluation of the retired photovoltaic module, generally adopting an evaluation mode taking a power output test as a core in the prior art, converting test results into standard reference conditions by calculating electrical parameters such as maximum power and the like through current and voltage acquisition of the module under specific working conditions so as to judge the output capacity and the reuse value of the module, and meanwhile, assisting an appearance inspection, an insulation resistance test or a withstand voltage test by a part of evaluation methods so as to judge whether the module meets basic electrical safety requirements. The evaluation method is widely applied to detection and classification of the photovoltaic modules, and provides an important technical basis for primary screening and performance judgment of retired modules. However, as the service life of the photovoltaic module increases, the performance degradation characteristic of the photovoltaic module gradually shows a multi-dimensional and asynchronous evolution rule, on one hand, the power output capability, the package aging inside the module and the back plate degradation do not always show a linear corresponding relation, the electrical state of the module is difficult to comprehensively reflect based on the power index alone, on the other hand, the traditional insulation test is mostly carried out under different working conditions or time conditions from the power test, and the test results lack uniform working condition constraint and time association, so that the effective corresponding relation between the power output result and the insulation safety state is difficult to form. Disclosure of Invention The present invention has been made in view of the above-described problems occurring in the prior art. Therefore, the invention provides a retired photovoltaic module performance evaluation method which solves the problems that in the prior art, the power evaluation and the insulation safety state are difficult to uniformly characterize, and the evaluation result lacks the correlation with the working condition. In order to solve the technical problems, the invention provides the following technical scheme: The invention provides a performance evaluation method of a retired photovoltaic module, which comprises the steps of obtaining a surface dry state baseline and synchronously configuring an acquisition channel and initialization under the condition that the installation posture, the clamping position and the frame grounding condition of the retired photovoltaic module to be evaluated are consistent, carrying out power output test on the retired photovoltaic module under the condition that the working condition is stable, acquiring voltage and current, obtaining maximum power and filling factor, carrying out normalization processing on power output data according to irradiance and temperature, generating power data with a time stamp and a working condition field, forming a damp-heat state on a back plate of the retired photovoltaic module under the condition that the installation posture and the grounding condition are unchanged, carrying out insulation pressing test on the retired photovoltaic module through a damp-heat triggering factor, continuously acquiring leakage current change, calculating dynamic insulation characteristic parameters, generating insulation data bound with a power data time stamp, carrying out joint criterion calculation on the power data and the insulation data when the power data and the insulation data meet the condition that the time stamp binding and the working condition are consistent, obtaining comprehensive evaluation value, and generating the performance grade of the retired photovoltaic module to be evaluated. The method for evaluating the performance of the retired photovoltaic module comprises the steps of performing nondestructive cleaning treatment on the retired photovoltaic module to enable the front surface and the back surface of the retired photovoltaic module to be in a dry stable state, and collecting the surface dry state baseline representing the electrical state of the back surface of the back plate of the retired photovoltaic module at a sampling position based on the dry stable state. The method for evaluating the performance of the retired photovoltaic module comprises the steps of configuring an irradiance acquisition channel and a temperature acquisition channel