Direct Stability Assessments of Network-Preserving Power System Models: Analysis, Foundations and Methodology

9505620 Chiang尽管取得了重大进展，但直接法仍然受到一些限制，这些限制使其无法离线和在线应用。这些限制可以分为：建模限制、场景限制、功能限制和准确性限制。在电力公司实际使用直接方法之前，必须消除或显著改进这些限制。过去，直接方法的一个主要限制是软件程序中各种直接方法实现中使用的模型过于简单。这项建议所提出的工作将克服大部分这种限制。第二个限制是直接方法只适用于第一次摆动的不稳定性。建议的项目将以这种方式加强直接方法，为识别多波不稳定情况提供有用的信息。第三个限制是直接方法的准确性和可靠性。本研究开发的保网电力系统模型（BCU方法）将显著改善这一局限性。本建议从计算和理论两方面寻求消除或改进直接方法的许多局限性，使其适用于实际大型电力系统的在线直接稳定性分析***

9505620 Chiang Despite its significant progress, the direct method still suffers from several limitations which prevent it from both off- line and on-line applications. These limitations may be classified into: modeling limitation, scenario limitation, function limitation and accuracy limitation. These limitations must be removed or significantly improved before direct methods can be actually used by power utilities. A major limitation of direct methods in the past has been the simplicity of the models used in various direct method implementations in software programs. Much of this limitation will be overcome by the work presented in this proposal. The second limitation has been that direct methods apply to first swing instability only. The proposed project will enhance direct methods in such a way to provide useful information for identifying multi-swing unstable cases. A third limitation has been the accuracy and reliability of direct methods. This limitation will be significantly improved by the work (BCU method) to be developed in this research for network-preserving power system models. This proposal seeks, from both computational and theoretical viewpoints, to remove or improve much of the limitations in direct methods and make them viable for on-line direct stability analysis of practical large-scale power systems ***