Degree Type

Dissertation

Date of Award

2003

Degree Name

Doctor of Philosophy

Department

Electrical and Computer Engineering

First Advisor

Vijay Vittal

Abstract

This dissertation provides a self-healing strategy to deal with catastrophic events such as simultaneous loss of several generating units or major transmission lines when power system vulnerability analysis indicates that the system is approaching an extreme emergency state. In our approach, the system is adaptively divided into smaller islands at a slightly reduced capacity with consideration of quick restoration. The basis for forming the islands is to minimize the load-generation imbalance in each island, thereby facilitating the restoration process. Then a carefully designed load shedding scheme based on the rate of frequency decline is applied to limit the extent of the disruption and expedite the restoration process. A slow coherency based islanding theory is provided. Issues regarding the linear and nonlinear applicability of the theory are discussed in detail. R-Rdot out of step relay is deployed to form the islands. The function of the relay can be enhanced with the help of phasor measurement technology and decision tree knowledge. An overall scheme including a new two-level load shedding scheme is proposed. The proposed scheme is tested on a 179-bus, 29-generator sample system and shows very good performance.

DOI

https://doi.org/10.31274/rtd-180813-126

Publisher

Digital Repository @ Iowa State University, http://lib.dr.iastate.edu

Copyright Owner

Haibo You

Language

en

Proquest ID

AAI3146478

File Format

application/pdf

File Size

124 pages

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