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Distribution network contingency analysis and contingency detection with the consideration of load models.

机译：考虑负荷模型的配电网应变分析和应变检测。

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摘要

The electric utility market environment has changed quite radically during recent years due to the process of deregulation. This has changed the asset management towards a capital controlled business where owners are trying to maximize their profits with cost optimization. To keep up with the increase demands on high reliability and high quality delivery systems, many utilities endeavor to rationalize their system operations with more intelligent control schemes and facilities.;A lot of issues under uncertainty such as load growth, quality of supply and environmental impact affect the reliability of the distribution system. Power outage is the most serious challenge that might affect the reliability of the distribution system, which normally leads to onerous financial losses as customer reimbursements and faulty equipment fixing or replacement. Hence, utility companies are obligated to assess their distribution network security, improve their service quality, and prevent potential power outage. An important aspect of this is contingency analysis, which involves understanding and mitigating potential failures in the network.;More accurate and efficient contingency analysis was implemented in this study based on comprehensive ZIP load model, which estimates the actual customer demand from the nominal demand and the actual voltage level. Considering the realistic characters of loads, low voltage load cut off function was introduced to acquire more credible analysis result. Field surveys were conducted to determine the load composition based on 18 separate device categories. To improve the computing efficiency, macro coefficients were derived. Based on this comprehensive ZIP model, load reconciliation was then integrated to power flow program to improve the analysis accuracy. The application of comprehensive load model and load reconciliation gives operators more accurate and credible indication than constant load.;Online contingency detection is another key function to improve the distribution network reliability. This study implements an effective detection system for contingencies such as transformer outages, open mains or other incidents using statistical approaches. Based on periodic network transformers loads readings, any transformer load change exceeds the normal load change boundary will be listed as suspect event to be analyzed. Sensitivity analysis is performed to verify the contingencies based on the actual real time transformer load changes and pre-calculated values for transformer load changes for each expected incident in the network. All the sensitivity matrices are calculated automatically on HP-UX environment and with the consideration of comprehensive ZIP load model.;Eventually, distribution network contingency analysis under different contingency levels is performed and detailed analysis results were given. The practical feasibility of the analysis method and the accuracy of the comprehensive ZIP load model greatly improve the accuracy and credibility of the contingency analysis. The validation of the online contingency detection system is also implemented on real distribution network and the test results match the actual event. All of these studies prevent potential cascade power outage, provide more accurate support for decision maker, facilitate an immediate repair of the faulty part and eventually improve the distribution system reliability.
机译：近年来，由于放松管制的过程，电力市场环境发生了根本性的变化。这已使资产管理朝着资本控制业务转变，在该业务中，所有者正试图通过成本优化来最大化利润。为了满足对高可靠性和高质量交付系统不断增长的需求，许多公用事业公司努力通过更智能的控制方案和设施来合理化其系统操作。;不确定性下的许多问题，例如负荷增长，供应质量和环境影响影响配电系统的可靠性。停电是最严重的挑战，可能会影响配电系统的可靠性，这通常会导致严重的财务损失，例如客户偿还费用以及设备安装或更换错误。因此，公用事业公司有义务评估其配电网络的安全性，提高其服务质量并防止潜在的断电。应变分析是其中的一个重要方面，它涉及了解和减轻网络中的潜在故障。基于全面的ZIP负载模型，本研究中实施了更准确，有效的应变分析，该模型从名义需求和实际需求中估算出实际的客户需求。实际电压水平。考虑到负载的实际特性，引入了低压负载切断功能，以获得更可靠的分析结果。进行了现场调查，以根据18种不同的设备类别确定负载组成。为了提高计算效率，导出了宏系数。在此综合ZIP模型的基础上，将负载协调功能集成到潮流程序中，以提高分析准确性。综合负荷模型和负荷对账的应用为运营商提供了比恒定负荷更准确，更可靠的指示。在线意外检测是提高配电网可靠性的另一个关键功能。这项研究使用统计方法为变压器故障，电网开路或其他事件等突发事件实施了有效的检测系统。根据定期的网络变压器负载读数，任何超出正常负载变化边界的变压器负载变化都将列为待分析的可疑事件。根据网络中每个预期事件的实际实时变压器负载变化和变压器负载变化的预先计算值，执行灵敏度分析以验证意外事件。在综合考虑ZIP负荷模型的基础上，在HP-UX环境下自动计算所有灵敏度矩阵。最终，对不同应急水平下的配电网应急分析，并给出详细的分析结果。分析方法的实际可行性和综合ZIP负载模型的准确性大大提高了应变分析的准确性和可信度。在线应变检测系统的验证也可以在真实的配电网络上进行，并且测试结果与实际事件相匹配。所有这些研究都可以防止潜在的级联停电，为决策者提供更准确的支持，有助于立即修复有故障的部件并最终提高配电系统的可靠性。

著录项

  • 作者

    Hu, Qiaohui.;

  • 作者单位

    The University of Texas at Arlington.;

  • 授予单位 The University of Texas at Arlington.;
  • 学科 Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 2010
  • 页码 108 p.
  • 总页数 108
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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