Controle coordenado de tensão e potência reativa

Abstract

Worldwide, the Voltage Collapse phenomenon are provoking drastic consequencesin the reliable operation of the Electric Power Systems. It can be noted that environmental and economic restrictions, besides of the deregulation process, have been taking the Power Systems to operate into a risk condition as far as voltage instability is concerned. In that situation the planning and operation actions become much more complex. The postponement of investments in the expansion of transmission and distribution systems has been responsible for using the voltage control resources in its limit conditions. In this scenario the voltage control and reactive power compensation play an extremely important role in view of uncontrolled degradation of the voltage profile and exhaustion of these resources. Traditionally, the voltage stability analysis have been made by static models that results in false diagnosis or erroneous interpretation about the phenomenon. An important step to the evaluation of these analysis is the incorporation of the most relevant dynamics in the voltage instability process. The proposal of this thesis is to present and validate a new methodology for studying the voltage collapse problem by a quasi-dynamic model which incorporates the dynamics of the elements responsible for the voltage control. The results achieved show that the methodology presented here is valid and present an valuable tool for planning and operations engineers as far as the safety and reliability indexes of the electric power systems are concerned. The results achieved, besides showing that the methodology is a valid one, also present an valuable tool for planning and operations engineers as far as the safety and reliability indexes of the electric power systems are concerned.