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Online voltage instability monitoring based on estimation of the Thevenin impedance has been thoroughly studied in many works. This equivalent impedance can be approximated either by phasor measurements of the load voltage and current or by these measurements in combination with system topology. Both approaches have their own characteristics, which are closely examined in this paper. The study is...
Power supply interruptions to final customers are mainly caused by failures in the distribution system. The increase of distributed generation connected to the distribution system offers a possibility to reduce the duration and frequency of such interruptions as local generation can be used to feed local demand. This paper presents results of an actual implementation of an islanding operation for...
In this paper it is proposed a methodology for simulating the behavior of electrical distribution networks, with the presence of intermittent sources of energy, based on a computational environment integrating power system static and dynamic simulation. The methodology represents an improvement over the simple implementation of power flow cases for different points of time series representing the...
This paper addresses the evaluation of total transfer capability in hydro-dominated power systems focusing on the Brazilian interconnected power systems. The methodology currently adopted by the Brazilian national system operator to compute transfer limits is presented. A methodology that automatically integrates optimal power flow, transient, small-signal and voltage stability simulation is also...
This paper investigates the influence of basic TCSC main circuit structure and control on subsynchronous torsional damping of a nearby turbine-generator. An improved s-domain model based on dynamic phasor approach was used to obtain the results presented in the paper. The study is conducted on the System-1 of the IEEE Second Benchmark Model. Detailed eigenvalue analyses are carried out in order to...
The Uruguayan power system is highly dependent on two 500 kV transmission lines connecting the largest generation site (Salto Grande) and the Argentinean interconnection in the North, to the largest loading area in the South. Actual occurrences, where both 500 kV lines tripped, lead the system to widespread blackouts including the critical area of Montevideo, the nation's capital district. This paper...
This paper presents a Power System Stabilizer (PSS) tuning procedure based on a Parallel Genetic Algorithm (PGA). The procedure is applied to the simultaneous tuning of 61 PSSs, using their actual models in the entire Brazilian Interconnected Power System (BIPS) modeled with 3849 buses. Heavy, median and light loading conditions were considered during the tuning process, to ensure control robustness...
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