Doctoral Thesis
DOI
10.11606/T.18.2017.tde-19052017-154844
Document
Author
Full name
Renato Braga de Lima Guedes
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2004
Supervisor
Committee
Bretas, Newton Geraldo (President)
Castro Junior, Carlos Alberto de
Costa, Vivaldo Fernando da
Silva, Luiz Carlos Pereira da
Souza, Antônio Carlos Zambroni de
Title in Portuguese
Cálculo das soluções de baixa tensão das equações de fluxo de carga através de sistemas dinâmicos auxiliares e função energia estendida com modelo ZIP para análise de colapso de tensão
Keywords in Portuguese
Fluxo de carga
Função energia
Métodos diretos
Soluções de baixa tensão
Abstract in Portuguese
Title in English
not available
Keywords in English
Direct methods
Energy function
Low voltage solutions
Voltage stability
Abstract in English
This work may be divided into two distinct parts. Both of them are new contributions to stability analysis of power systems. In the first part it is proposed a new method to calculate the critical load flow low voltage solutions, and it is the main part of this work. Meanwhile, the last two chapters of this work presents a proposed extended energy function that consider the common load ZIP models. It allows the analysis of angle and voltage stability for power systems subjected to large disturbances. This work proposes a method to calculate the low voltage solutions (LVS) of the load flow equations of an electrical power system. The proposed method identifies the LVS involved in the saddle-node bifurcation leading the power system to a voltage collapse. This solution is known as the critical low voltage solution. In order to perform the proposed calculation, an auxiliary dynamical gradient system is used. It is shown that the equilibrium points of that associated auxiliary dynamical gradient system are the solutions of the load flow equations. In such manner, the paper proposes identifying the critical LVS calculating the equilibrium points of an auxiliary dynamical gradient system. The proposed method was tested on the Stagg 5-bus, on the IEEE 39-bus and on IEEE 118-bus test systems, and the results are presented at the end of the text.