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  • 1.
    Ferreira, Danton D.
    et al.
    Federal University of Lavras, Engineering Department, Federal University of Lavras.
    de Seixas, Jose M.
    Federal University of Rio de Janeiro, COPPE/Poli.
    Cerqueira, Augusto S.
    Department of Electrical Circuits, Federal University of Juiz de Fora, Campus Universitário.
    Duque, Carlos A.
    Federal University of Juiz de Fora, Minas Gerais, Department of Electrical Circuits, Federal University of Juiz de Fora, Campus Universitário.
    Bollen, Math
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.
    Ribeiro, Paulo F.
    Federal University of Itajubá, Department of Electrical Engineering, Federal University of Itajubá.
    Extracting the transient events from power system signals by independent component analysis2016In: International Transactions on Electrical Energy Systems, E-ISSN 2050-7038, Vol. 26, no 4, p. 884-900Article in journal (Refereed)
    Abstract [en]

    This paper presents a method for extracting transient events from the power system signal based on independent component analysis. The extraction of transients is important to diagnose the system in terms of power quality, because the computation of power quality indices from the extracted events is more efficient and easier to be carried out. Furthermore, the proposed method can be applied as a preprocessing tool for transient characterization in disturbance detection, classification, and identification systems. Both qualitative and quantitative analyses demonstrate the efficiency and the advantages of the proposed method in comparison with other approaches commonly used for the same purpose.

  • 2.
    Gil-de-Castro, Aurora
    et al.
    University of Cordoba.
    Rönnberg, Sarah
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.
    Bollen, Math
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.
    Moreno-Muñoz, Antonio
    University of Cordoba.
    Harmonic phase angles for a domestic customer with different types of lighting2015In: International Transactions on Electrical Energy Systems, E-ISSN 2050-7038, Vol. 25, no 7, p. 1281-1296Article in journal (Refereed)
    Abstract [en]

    This paper presents measurements of the changes in phase angle of the harmonic current for a domestic costumer due to the introduction of energy-efficient lamps (compact fluorescent lamps and light-emitting diodes lamps). Those results are then compared with the aggregation rules according to standard IEC 61000-3-6 and with a mathematical model, in order to highlight the importance of using phase angles in the harmonic estimations. The paper presents both the emission from individual household devices and the variations in the complex harmonic current from a group of devices. Cancellation because of phase-angle difference plays an important role in the emission from a group of different devices. This explains why the increase in emission after changing to energy-efficient lamps is much smaller than expected. Some other power-quality parameters are also considered such as total harmonic distortion, total power factor, and displacement power factor. It is concluded that the complex plane presentation is a useful tool to estimate the harmonic emission from a group of domestic appliances.

  • 3.
    Mustafa, Mohammed Obaid
    et al.
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems. University of Mosul, College of Engineering, Mosul, Iraq.
    Nikolakopoulos, George
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Gustafsson, Thomas
    Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Signals and Systems.
    Broken Bars Fault Diagnosis Based on Uncertainty Bounds Violation for Three Phase Induction Motors2015In: International Transactions on Electrical Energy Systems, E-ISSN 2050-7038, p. 304-325Article in journal (Refereed)
    Abstract [en]

    In this article, a novel fault diagnosis scheme, based on uncertainty bounds violation, is being presented for the case of broken bars in squirrel–cage Three Phase Induction Motors. The fault diagnosis is done in two steps. Firstly the parameters of the healthy induction motor are identified using a set member- ship identification (SMI) approach, where corresponding uncertainty bounds are also being provided. Secondly the proposed uncertainty bounds violation conditions for the fault diagnosis are evaluated on–line, on the converged identified model, during a sliding time window. Multiple simulation results are presented that demonstrate the efficacy of the proposed scheme towards fault detection and diagnosis among different number of broken bars.

  • 4.
    Salles, Rafael S.
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.
    Silva, Maise N. S.
    Institute of Electrical Systems and Energy, Federal University of Itajubá, Itajubá 37500 903 Brazil.
    Ribeiro, Paulo F.
    Institute of Electrical Systems and Energy, Federal University of Itajubá, Itajubá 37500 903 Brazil.
    Observations on Harmonics Summation in Transmission Systems: Alternative Aggregation Estimation2022In: International Transactions on Electrical Energy Systems, E-ISSN 2050-7038, article id 5313417Article in journal (Refereed)
    Abstract [en]

    The aggregation of harmonic components from different sources is one of the critical and challenging assessments in electric power systems. Harmonic summation analysis and estimation is not a simple task since there will be variations because of the grid complexity, nonlinear sources, and unpredictable behaviour of harmonic currents that affect the results. An evaluation of harmonic summation using alternative methods to calculate the harmonic composition at any network point is suggested. A typical arrangement of transmission grids was modelled and used to simulate the results. This paper aims to highlight the results obtained by these alternative methods of harmonic summation and show the role of this type of analysis in transmission systems planning. The contributions are (a) illustrate how alternative methods of harmonic summation can be applied to investigate harmonic aggregation from different sources; (b) provide a case study that also discusses the harmonic aggregation effects with different locations of sources and component phase angle shifting; (c) show comparison and correlation between those alternative summations calculations with a standardized and firmly adopted method (proposed by IEC 61000-3-6). The software MATLAB/Simulink performs simulation and analysis. Finally, the work discusses the findings.

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