Evaluation of mismatch power loss in a PV string composed of series-connected modules: Theory versus experiment

IF 6 2区工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY

Ain Shams Engineering Journal Pub Date : 2025-04-24 DOI:10.1016/j.asej.2025.103422

Reham Kamal, Mazen Abdel-Salam , Mohamed Nayel

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引用次数: 0

Abstract

Ground-installed PV power-systems are usually built in parallel-rows; each is composed of series-connected modules. With time, some modules got-polluted or −shaded differently. On damage, some modules may be replaced by others of different ratings. This creates mismatch among the series-connected modules accompanied by loss of output power. This motivates the authors to extend their earlier proposed three-stage methodology for calculating the I-V and P-V curves to evaluate the mismatch power loss. The studied mismatches are due to series-connected dusty and clean modules, modules with different ratings, and modules with a half-cell shading in one of the modules. The proposed three-stage methodology is based on solution of Lambert-function in three-steps. The calculated current–voltage and power-voltage curves as well as highest output power by proposed methodology are validated by experimental results for the investigated mismatch conditions. The percentage mismatch power-loss recorded values of 5.4 %, 12.11 %, and 17.9 %.

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由串联模块组成的PV串失配功率损耗的评估：理论与实验

地面安装的光伏发电系统通常是平行排列的；每个模块由串联模块组成。随着时间的推移，一些模块会受到不同的污染或阴影。在伤害方面，一些模块可能会被其他不同等级的模块所取代。这将造成串联模块之间的不匹配，并伴随着输出功率的损失。这促使作者扩展他们先前提出的计算I-V和P-V曲线的三阶段方法，以评估失配功率损耗。所研究的不匹配是由于串联的灰尘和清洁模块，具有不同额定值的模块，以及在其中一个模块中具有半单元阴影的模块。提出的三阶段方法是基于兰伯特函数的三步解。实验结果验证了该方法计算得到的电流-电压曲线和功率-电压曲线以及最大输出功率。失配功率损耗的百分比记录值分别为5.4%、12.11%和17.9%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Ain Shams Engineering Journal Engineering-General Engineering

CiteScore

10.80

自引率

13.30%

发文量

441

审稿时长

49 weeks

期刊介绍： in Shams Engineering Journal is an international journal devoted to publication of peer reviewed original high-quality research papers and review papers in both traditional topics and those of emerging science and technology. Areas of both theoretical and fundamental interest as well as those concerning industrial applications, emerging instrumental techniques and those which have some practical application to an aspect of human endeavor, such as the preservation of the environment, health, waste disposal are welcome. The overall focus is on original and rigorous scientific research results which have generic significance. Ain Shams Engineering Journal focuses upon aspects of mechanical engineering, electrical engineering, civil engineering, chemical engineering, petroleum engineering, environmental engineering, architectural and urban planning engineering. Papers in which knowledge from other disciplines is integrated with engineering are especially welcome like nanotechnology, material sciences, and computational methods as well as applied basic sciences: engineering mathematics, physics and chemistry.