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- 검색키워드
- 저자 : Braz J. Cardoso Filho (검색결과 3 건)
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The True Unity Power Factor Converter – A practical filterless solution for sinusoidal currents
Thiago M. Parreiras,Julio C. G. Justino,Braz de J. Cardoso Filho 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
High power conversion entails the necessity of converters interfacing with the grid which have both low losses and low harmonic content. For this purpose several topologies have been proposed, but, due to the restriction imposed on the switching frequency, these topologies often make use of complex multi winding transformers or large sinusoidal filters. These features increase cost, losses and reduce reliability of the converters. This paper proposes a new solution called True Unity Power Factor (TUPF) converter, which makes use of a well selected PWM pattern, a simple three winding transformer and two or three level active rectifier topologies. As the name implies, this converter is capable of delivering a true unity power factor conversion and accomplish these task keeping a low enough switching frequency without using any capacitive filter element. This paper shows the mains elements of the TUPF concept, some applicable regenerative or non-regenerative topologies, simulation and experimental results.
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Fourier-Based PLL Applied for Selective Harmonic Estimation in Electric Power Systems
Santos, Claudio H.G.,Ferreira, Reginaldo V.,Silva, Sidelmo Magalhaes,Cardoso Filho, Braz J. The Korean Institute of Power Electronics 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.5
In this paper, the Fourier-based PLL (Phase-locked Loop) is introduced with a new structure, capable of selective harmonic detection in single and three-phase systems. The application of the FB-PLL to harmonic detection is discussed and a new model applicable to three-phase systems is introduced. An analysis of the convergence of the FB-PLL based on a linear model is presented. Simulation and experimental results are included for performance analysis and to support the theoretical development. The decomposition of an input signal in its harmonic components using the Fourier theory is based on previous knowledge of the signal fundamental frequency, which cannot be easily implemented with input signals with varying frequencies or subjected to phase-angle jumps. In this scenario, the main contribution of this paper is the association of a phase-locked loop system, with a harmonic decomposition and reconstruction method, based on the well-established Fourier theory, to allow for the tracking of the fundamental component and desired harmonics from distorted input signals with a varying frequency, amplitude and phase-angle. The application of the proposed technique in three-phase systems is supported by results obtained under unbalanced and voltage sag conditions.
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Fourier-Based PLL Applied for Selective Harmonic Estimation in Electric Power Systems
Claudio H. G. Santos,Reginaldo V. Ferreira,Sidelmo Magalhaes Silva,Braz J. Cardoso Filho 전력전자학회 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.5
In this paper, the Fourier-based PLL (Phase-locked Loop) is introduced with a new structure, capable of selective harmonic detection in single and three-phase systems. The application of the FB-PLL to harmonic detection is discussed and a new model applicable to three-phase systems is introduced. An analysis of the convergence of the FB-PLL based on a linear model is presented. Simulation and experimental results are included for performance analysis and to support the theoretical development. The decomposition of an input signal in its harmonic components using the Fourier theory is based on previous knowledge of the signal fundamental frequency, which cannot be easily implemented with input signals with varying frequencies or subjected to phase-angle jumps. In this scenario, the main contribution of this paper is the association of a phase-locked loop system, with a harmonic decomposition and reconstruction method, based on the well-established Fourier theory, to allow for the tracking of the fundamental component and desired harmonics from distorted input signals with a varying frequency, amplitude and phase-angle. The application of the proposed technique in three-phase systems is supported by results obtained under unbalanced and voltage sag conditions.
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