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Analysis of optimal matching between a dc motor and photovoltaic modules via dc-dc power converters.

机译:通过dc-dc功率转换器分析dc电动机和光伏模块之间的最佳匹配。

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摘要

Due to the nonlinear behavior of the photovoltaic (PV) cells, dc-dc power converters are added for matching the load to the photovoltaic generators; thus, maximum power can be reached. In this thesis, mathematical models were used to examine the behavior of the off-grid photovoltaic system composed by: PV generator, dc-dc converter and dc motor. Different converter topologies (step-up, step-down and step-down/step-up) are compared, evaluating their feasibility to be used as interface to attain operation around the maximum power point (MPP). The analysis found the relationships between the optimal duty ratio and the maximum motor speed, which are used to select the simplest topology to meet the requirement as interface. Moreover, several maximum power point tracking (MPPT) methods including model-based MPPT methods and MPPT searching algorithms are implemented on a microcontroller and tested in real weather conditions. MPPT searching algorithms are recommended for real applications, such algorithms do not require tuning due to parameter variations by aging or dusty environment of the PV module and the fluctuation of the PV voltage has little effect on the motor speed.
机译:由于光伏(PV)电池的非线性行为,添加了dc-dc功率转换器,以使负载与光伏发电机相匹配。因此,可以达到最大功率。本文采用数学模型对离网光伏系统的性能进行了研究,该系统由光伏发电机,直流-直流转换器和直流电动机组成。比较了不同的转换器拓扑(升压,降压和降压/升压),评估了它们用作实现最大功率点(MPP)附近的接口的可行性。分析发现最佳占空比和最大电动机速度之间的关系,这些关系用于选择最简单的拓扑来满足作为接口的要求。此外,在微控制器上实现了几种最大功率点跟踪(MPPT)方法,包括基于模型的MPPT方法和MPPT搜索算法,并在实际天气条件下进行了测试。建议将MPPT搜索算法用于实际应用,由于参数因PV模块的老化或多尘环境而变化,因此不需要进行此类调整,并且PV电压的波动对电动机速度几乎没有影响。

著录项

  • 作者单位

    University of Puerto Rico, Mayaguez (Puerto Rico).;

  • 授予单位 University of Puerto Rico, Mayaguez (Puerto Rico).;
  • 学科 Alternative Energy.;Energy.;Engineering Electronics and Electrical.
  • 学位 M.S.
  • 年度 2010
  • 页码 144 p.
  • 总页数 144
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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