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This paper is focused on the transient stability constrained optimal power flow (TSC-OPF) problem and its application for determining the optimal dispatch of active and reactive powers of distributed synchronous generators. In order to relieve the mathematical complexity of the TSC-OPF problem with respect to its dimensionality, this paper proposes a decomposition of the power system model in a two-time...
The constant growth of wind farms in the Brazilian electric system increases the concerns regarding power quality, especially related to harmonic distortions. At the same time, wind generation also becomes relevant in the context of power system stability, operating as ancillary services. One of the requirements of the system operator is the injection of reactive power by the wind farms to maintain...
This paper presents a review of several robotic tools applied to the activity of pruning near power distribution lines. Power utilities prune trees to minimize the tree-caused power outages, because they are the greatest single cause of outages for power utilities in overhead distribution systems. Pruning trees around overhead power lines is considered a dangerous task due to many factors such as...
This paper presents a method to model the saturation curve of power transformers and its impact to power system simulation studies. Thus, the article addresses the particularities of the proposed method (based on field measurements) compared to others found in the literature, especially the treatment of voltage signal and the residual flux. In addition, it shows a simulation study carried out in order...
This work discusses the results and the methodology used for modeling the control dynamic of two DG Distributed Generation technologies: micro turbine and photovoltaic. The models were developed from laboratory tests results using black box models and classical control theory. In the laboratory test setup the sources were connected between them and with resistive electrical loads by a switch and a...
This work presents the results and analysis of a power quality measurement realized in a large scale PV system. The evaluated system is a 1 MVA centralized PV plant with different technologies of photovoltaic panels and inverters. The power quality measurement was made in accordance with the Brazilian and international power quality regulation. The magnitudes measured were voltage, current, power,...
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