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Computer-aided analysis of multijunction solar concentrator cells and systems.

机译：多结太阳能聚光器电池和系统的计算机辅助分析。

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摘要

Multijunction concentrator solar cells are a promising technology in the effort to alleviate the growing energy demand with renewable sources, as they are capable of high conversion efficiencies while reducing system cost by utilizing small cell areas. Yet, these cells and systems have many unique issues that must be resolved in order for them to be viable for large-scale energy production. Moreover, many of the power loss mechanisms are internal phenomenon and therefore must be modeled. Consequentially, this work is directed towards the computer-aided analysis of multijunction solar concentrator cells and systems. A curve-fit model, for use as an embedded system tool is developed. It is shown that the series resistance extracted from this model for a GaAs concentrator solar cell is within 10% of the expected value. A quasi-3D distributed emitter model is developed to simulate effects related to the lateral flow of current in a solar cell emitter layer. The quasi-3D model is applied to the analysis loss mechanisms and grid optimization for single- and dual-junction solar cells under a non-uniform illumination profile. It is shown that highly non-uniform illumination may result in a greater than 5% power loss, relative to the uniform illumination case. Further, it is shown that the bias-point loss, which results from the potential gradient across the emitter forcing most of the cell area to operate away from the local maximum power condition, plays a very significant role in determining cell performance and the optimal grid electrode pattern, particularly under highly non-uniform illumination. The quasi-3D model is also applied to the analysis of solar tracker error. It is shown that for a systematic tracker error that varies over the course of a day, only small performance degradation is found unless the illumination pattern begins to wander off the cell area. Detailed numerical models are utilized in the design of a GaInP/GaAs concentrator solar cell for maximum yearly energy production. It is found that designs optimized for AM1.5d produce nearly maximum yearly energy. This result is largely independent of geographic location and the optical concentration.
机译：多结聚光太阳能电池在缓解可再生资源不断增长的能源需求方面是一项很有前途的技术，因为它们能够通过利用小电池面积实现高转换效率，同时降低系统成本。然而，这些电池和系统具有许多独特的问题，必须解决这些问题才能使它们能够大规模生产能源。此外，许多功率损耗机制是内部现象，因此必须进行建模。因此，这项工作是针对多结太阳能集中器单元和系统的计算机辅助分析。开发了一种曲线拟合模型，用作嵌入式系统工具。结果表明，从该模型中提取的GaAs聚光太阳能电池的串联电阻在预期值的10％以内。开发了准3D分布式发射极模型，以模拟与太阳能电池发射极层中电流横向流动相关的效应。将准3D模型应用于非均匀照明轮廓下的单结和双结太阳能电池的分析损耗机理和网格优化。结果表明，相对于均匀照明情况，高度不均匀照明可能导致大于5％的功率损耗。此外，表明偏置点损耗是由横跨发射极的电势梯度造成的，该偏置电压迫使大多数电池区域远离局部最大功率条件工作，在确定电池性能和最佳电网方面起着非常重要的作用。电极图案，尤其是在高度不均匀的照明下。准3D模型也用于分析太阳跟踪器误差。结果表明，对于在一天中变化的系统跟踪器错误，除非照明图案开始偏离单元区域，否则只会发现较小的性能下降。 GaInP / GaAs聚光器太阳能电池的设计中采用了详细的数值模型，以实现最大的年度能源生产。发现针对AM1.5d优化的设计可产生几乎每年最大的能量。该结果在很大程度上与地理位置和光学集中度无关。

著录项

  • 作者

    Haas, Alexander W.;

  • 作者单位

    Purdue University.;

  • 授予单位 Purdue University.;
  • 学科 Alternative Energy.;Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 2011
  • 页码 311 p.
  • 总页数 311
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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