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The effects of bad weather conditions on transmission lines associated with high speed wind events have concerned not only industry players, but also the government and consumers of electricity. Recently in Brazil, events of this nature have caused large-scale disruptions in the supply of electricity, resulting in direct economic losses throughout the chain of production and consumption.This paper...
The stability of interconnected large power systems — like the Brazilian National Grid (SIN) — is directly compromised by weakly or not damped low frequency oscillations and transitory oscillations, these latter originated from large contingencies. In order to identify and control the system oscillation modes efficiently, the dynamic behavior of various wide areas, it becomes necessary synchrophasor...
This paper discusses the models, and the results of line energization and reclosing, as well as the line insulation coordination for a 1000 kV line under study in Brazil. The study presented here is a sequenceto the concept and description of the 1000 kV line presented in a companion paper. The means to reduce the overvoltages such as the use of closing/opening resistors and synchronized switching...
At present, very few Ultra High Voltage transmission projects (1000 kV or above) were constructed in the world. From these projects, China has some projects operating at this voltage level showing reportedly a satisfactory performance. The rest of the UHV (Ultra High Voltage) projects, although designed for such voltage level, are operating at lower voltages. This paper aims at reporting the main...
A 1000 kV system is under viability analysis to transmit the exceeding power from wind power plants (WPP) located in the Brazilian northeast region. In this article, the modeling of the 1000 kV system for electromagnetic transients and the results of arc extinction after fault conditions are examined as part of an overall line overvoltage and insulation coordination study. Some mitigation alternatives...
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