Modeling and Performance Investigations of Partially Shaded Solar PV Arrays with Cell Partition Technique based Modules

V. Balaraju, C. Chengaiah
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Abstract

Solar photovoltaic (PV) modules consist of solar cells connected in series to provide the required output power. The solar PV system is experiencing major challenges, which are mainly due to the partial shadows on the photovoltaic modules leading to mismatching power loss and hot spot problems. Hotspots have become a major cause of PV module failure. The Cell Partition Technique (CPT) is proposed to reduce hotspots and minimize mismatch losses caused by partial shadings. Specifically, each solar PV cell (Full cell) in a solar PV module is divided or partitioned into two half cells (known as Half-Cut Cells or HC) and three equal cells (known as Tri-Cut Cells or TC) in accordance with the proposed technique. The HC and TC types of cells are connected in a strings of series-parallel connection, and bypass diode is placed in middle of the solar PV module to ensure proper operation. The primary aim of this research is to model, evaluate, and investigate the performance of solar PV arrays using new PV modules are developed based on Cell Partition Technique (PVM-CPT), such as half-cut cell modules (HCM), and tri-cut cell modules (TCM) and compared with full-sized cell modules (FCM). These PVM-CPT are connected in Series–Parallel (SP), Total-Cross-Tied (TCT), and proposed static shade dispersion based TCT reconfiguration (SD-TCTR) for the array sizes of 3x4, 4x3 and 4x4, respectively. The purpose is to select the most appropriate solar PV array configurations in terms of the highest global maximum power and thus the lowest mismatch power losses under short and narrow, short and wide, long and narrow, long and wide type of cell level partial shadings. The Matlab/Simulink software is used to simulate and analyze all of the shading cases. The results show that, when compared to conventional module configurations under different shading conditions, the proposed static SD-TCTR arrangement with TC modules (SDTCTR-TCM) exhibits the lowest mismatch power losses and the greatest improvement in array power.
基于单元划分技术的部分遮阳太阳能光伏阵列建模与性能研究
太阳能光伏(PV)组件由串联的太阳能电池组成,以提供所需的输出功率。太阳能光伏系统正面临着重大的挑战,这主要是由于光伏组件上的部分阴影导致的失配功率损失和热点问题。热点已成为光伏组件故障的主要原因。提出了单元分割技术(Cell Partition Technique, CPT),以减少热点和减少部分阴影造成的失配损失。具体来说,根据所提出的技术,太阳能光伏组件中的每个太阳能光伏电池(全电池)被分成两个半电池(称为半切电池或HC)和三个相等的电池(称为三切电池或TC)。HC型和TC型电池串并联连接,旁路二极管置于太阳能光伏组件中间,保证正常工作。本研究的主要目的是利用基于电池分割技术(PVM-CPT)开发的新型光伏组件(如半切电池组件(HCM)和三切电池组件(TCM))对太阳能光伏电池阵列的性能进行建模、评估和研究,并与全尺寸电池组件(FCM)进行比较。这些PVM-CPT分别以串并联(SP),全交叉连接(TCT)和基于静态阴影色散的TCT重构(SD-TCTR)的方式连接,阵列尺寸分别为3x4, 4x3和4x4。目的是在短与窄、短与宽、长与窄、长与宽类型的电池级部分遮阳下,根据最高的全局最大功率选择最合适的太阳能光伏阵列配置,从而实现最低的失配功率损失。使用Matlab/Simulink软件对所有遮阳案例进行了模拟和分析。结果表明,在不同遮光条件下,与传统模块配置相比,本文提出的静态SD-TCTR与TC模块(sdctr - tcm)的失配功率损失最低,阵列功率提升最大。
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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