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A model of photovoltaic fields in mismatching conditions featuring an improved calculation speed

机译:具有不匹配条件的光伏场模型,具有提高的计算速度

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摘要

The model of photovoltaic (PV) fields in mismatching conditions presented in this paper is a tradeoff between accuracy and calculation time. The detailed single diode model, including series and parallel resistances, is considered for the PV modules, while the bypass and blocking diodes are represented with a piecewise linear model. The model profits from the possibility to express each PV module voltage as an explicit function of the current by using the Lambert-W function. The balancing of the string voltage with those ones of the active and inactive modules, as well as of the blocking diode, allows to construct only one non-linear equation depending on the string current. Consequently, the solution of only one equation allows to calculate the string current for a given string voltage, and the current of the whole field is calculated by adding the currents of all parallel strings. The advantages of the proposed model are illustrated by comparing it with two approaches recently published in literature. The model accuracy is evaluated with small, medium and large PV fields, and its usefulness for performing energetic analysis and dynamical simulations is also illustrated. Finally, experimental validation of the model on a small scale PV array is provided.
机译:本文提出的不匹配条件下的光伏(PV)场模型是精度与计算时间之间的权衡。 PV模块考虑了详细的单二极管模型,包括串联电阻和并联电阻,而旁路二极管和阻塞二极管则采用分段线性模型表示。该模型得益于通过使用Lambert-W函数将每个PV模块电压表示为电流的显式函数的可能性。串电压与有源模块和非有源模块以及阻塞二极管中的那些模块之间的平衡,允许根据串电流仅构造一个非线性方程式。因此,仅用一个方程式的解就可以计算给定串电压下的串电流,并且通过将所有并联串的电流相加来计算整个场的电流。通过将其与文献中最近发布的两种方法进行比较,说明了所提出模型的优势。使用小,中和大PV场评估模型的准确性,并说明其对进行能量分析和动力学仿真的有用性。最后,提供了在小规模光伏阵列上对模型进行实验验证。

著录项

  • 来源
    《Electric power systems research》 |2013年第3期|81-90|共10页
  • 作者单位

    School of Electrical and Electronic Engineering. Universidad del Valle, Colombia;

    School of Electrical and Electronic Engineering. Universidad del Valle, Colombia;

    Dip. Ingegneria Elettronica e Ingegneria Informatica. University of Salerno. Italy;

    School of Electrical and Electronic Engineering. Universidad del Valle, Colombia;

    Dip. Ingegneria Elettronica e Ingegneria Informatica. University of Salerno. Italy;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    PV array model; mismatching; shadowing; calculation time;

    机译:光伏阵列模型不匹配阴影计算时间;

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