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Voltage Stability Impact of Grid-Tied Photovoltaic Systems Utilizing Dynamic Reactive Power Control.

机译：利用动态无功功率控制的并网光伏系统的电压稳定性影响。

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摘要

Photovoltaic (PV) DGs can be optimized to provide reactive power support to the grid, although this feature is currently rarely utilized as most DG systems are designed to operate with unity power factor and supply real power only to the grid. In this work, the voltage stability of a power system embedded with PV DG is examined in the context of the high reactive power requirement after a voltage sag or fault. A real-time dynamic multi-function power controller that enables renewable source PV DGs to provide the reactive power support necessary to maintain the voltage stability of the microgrid, and consequently, the wider power system is proposed.;The loadability limit necessary to maintain the voltage stability of an interconnected microgrid is determined by using bifurcation analysis to test for the singularity of the network Jacobian and load differential equations with and without the contribution of the DG. The maximum and minimum real and reactive power support permissible from the DG is obtained from the loadability limit and used as the limiting factors in controlling the real and reactive power contribution from the PV source. The designed controller regulates the voltage output based on instantaneous power theory at the point-of-common coupling (PCC) while the reactive power supply is controlled by means of the power factor and reactive current droop method. The control method is implemented in a modified IEEE 13-bus test feeder system using PSCADRTM power system analysis software and is applied to the model of a Tampa ElectricRTM PV installation at Lowry Park Zoo in Tampa, FL.;This dissertation accomplishes the systematic analysis of the voltage impact of a PV DG-embedded power distribution system. The method employed in this work bases the contribution of the PV resource on the voltage stability margins of the microgrid rather than the commonly used loss-of-load probability (LOLP) and effective load-carrying capability (ELCC) measures. The results of the proposed method show good improvement in the before-, during-, and post-start voltage levels at the motor terminals. The voltage stability margin approach provides the utility a more useful measure in sizing and locating PV resources to support the overall power system stability in an emerging smart grid.
机译：光伏（PV）DG可以进行优化，以为电网提供无功功率支持，尽管由于大多数DG系统设计为以统一的功率因数运行并且仅向电网提供有功功率，所以目前很少使用此功能。在这项工作中，在电压暂降或故障后对无功功率的要求较高的情况下，对嵌入PV DG的电力系统的电压稳定性进行了检查。一种实时动态多功能功率控制器，它使可再生能源PV DG提供维持微电网电压稳定性所需的无功功率支持，因此，提出了更广泛的电力系统。通过使用分叉分析来测试网络雅可比方程的奇异性和负载微分方程在有无DG贡献的情况下确定互连微电网的电压稳定性。 DG允许的最大和最小有功和无功功率支持是从负载限制中获得的，并用作控制PV源的有功和无功功率的限制因素。设计的控制器基于瞬时功率理论在公共点耦合（PCC）上调节电压输出，而无功电源则通过功率因数和无功电流下垂方法进行控制。该控制方法是使用PSCADRTM电力系统分析软件在改进的IEEE 13总线测试馈线系统中实现的，并应用于佛罗里达州坦帕市Lowry Park Zoo的Tampa ElectricRTM PV安装模型。光伏DG嵌入式配电系统的电压影响。在这项工作中采用的方法将光伏资源的贡献建立在微电网的电压稳定裕度上，而不是基于常用的失载概率（LOLP）和有效承载能力（ELCC）措施。所提出方法的结果表明，在电动机端子上的起动前，起动中和起动后电压水平上都有很好的改善。电压稳定裕度方法为公用事业提供了一种更有用的措施，可用于确定和定位PV资源的大小，以支持新兴智能电网中总体电力系统的稳定性。

著录项

  • 作者

    Omole, Adedamola.;

  • 作者单位

    University of South Florida.;

  • 授予单位 University of South Florida.;
  • 学科 Alternative Energy.;Energy.;Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 2010
  • 页码 168 p.
  • 总页数 168
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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