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Reliability Evaluation and Improvement Based on Operational Failure Rate of Power Electronics in Islanded Microgrid

机译：基于孤岛微电网中电力电子设备运行故障率的可靠性评估与改进

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摘要

With power electronics being widely applied in microgrids, they become a key part in micro-grid and the reliability assessment considering power electronic devices have become a hot research topic, and much work has been done to evaluate the reliability of power electronics in microgrids. However, the impact of operational failure of power electronics on the overall microgrid reliability has not been studied yet.;This thesis has three objectives. The first objective of this thesis is to construct a systematic operational failure rate model of power electronic systems. The power generated from renewable generation units, such as PV arrays or wind turbines, is uncertain and difficult to predict. With the operational impact based on operational conditions taken into consideration, the evaluation of reliability is more accurate and it will make a great contribution to the design process and avoid costly expenses caused by undesired failures in microgrids. The second objective is to apply this model to do reliability assessment of the overall islanded microgrid with high penetration of renewable energy generation systems. In addition, this paper combines several reliability assessment methods. The third objective is to improve the reliability of the microgrid system by replacing the conventional battery storage system to the hybrid energy storage system. Based on this proposed model, the operational failure models for the power electronic systems in an modified benchmark 0.4 kV test system were built and tested, and then the sensitivity analysis, exploring the influence of various factors, was studied.
机译：随着电力电子学在微电网中的广泛应用，它们成为微电网中的关键部分，考虑到电力电子设备的可靠性评估已成为研究的热点，为评估微电网中的电力电子设备的可靠性进行了大量的工作。然而，尚未研究电力电子设备的运行故障对整体微电网可靠性的影响。本文的首要目的是建立电力电子系统的系统运行失效率模型。由可再生能源发电单元（例如光伏阵列或风力涡轮机）产生的电力是不确定的且难以预测。考虑到基于运行条件的运行影响，可靠性评估将更加准确，这将对设计过程做出巨大贡献，并避免因微电网意外故障而导致的高昂费用。第二个目标是应用此模型对具有高渗透率的可再生能源发电系统的整个孤岛微电网进行可靠性评估。另外，本文结合了几种可靠性评估方法。第三个目标是通过将常规电池存储系统替换为混合能量存储系统来提高微电网系统的可靠性。在此模型的基础上，建立并测试了修改后的基准0.4 kV测试系统中电力电子系统的运行故障模型，然后进行了灵敏度分析，探讨了各种因素的影响。

著录项

  • 作者

    Zhong, Wen.;

  • 作者单位

    The University of Wisconsin - Milwaukee.;

  • 授予单位 The University of Wisconsin - Milwaukee.;
  • 学科 Electrical engineering.
  • 学位 M.S.
  • 年度 2018
  • 页码 97 p.
  • 总页数 97
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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