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Your search keyword '"Ribeiro, Paulo F."' showing total 150 results
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150 results on '"Ribeiro, Paulo F."'

4. PLL Based Method for Supraharmonics Emission Assessment.

Author

Mendes, Thais M., Ferreira, Danton D., Silva, Leandro R. M., Ribeiro, Paulo F., Meyer, Jan, and Duque, Carlos A.

Subjects
POWER electronics
Abstract

Supraharmonic (SH) disturbances are generated mainly by power electronics whose usage has increased significantly in the last decades. Consequently, supraharmonics have increased as well. The SH frequency range from 2 kHz to 150 kHz still lacks a normative measurement method. Compatibility levels and emission limits of SH are commonly presented as quasi-peak (QP) detector values for a bandwidth (BW) of 200 Hz measured by CISPR 16 receivers. In this context, this paper proposes an optimized method emulating the CISPR 16 receiver with QP detector for measuring grid disturbance levels. It makes innovative use of PLL (Phase-Locked Loop) units for estimating the highest distortion levels in the SH frequency range of the test signal, and in sequence, the QP detector with the appropriate specifications in the CISPR 16 standard is applied. Different cases of both synthetic and real signals were applied to the proposed method, which showed to be efficient in evaluating SH levels for current and voltage signals. An analysis of maximum permissible distortion levels is performed considering an individual SH distortion. In addition, the proposed method presents a computational cost reduction of approximately 91% in relation to the CISPR 16 method considering a specific case of signal containing SH distortions used for power quality analysis. [ABSTRACT FROM AUTHOR]

Published
2022
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16. Grid Connected PV with Storage System Simulation for Distribution Grid Supporting

Author

Pinheiro, Guilherme Goncalves, primary, Gomez, Nelson Alejandro Herrera, additional, Ribeiro, Paulo F., additional, SantrAna, Wilson Cesar, additional, Gonzatti, Robson Bauwelz, additional, Pereira, Rondineli Rodrigues, additional, Lambert-Torres, Germano, additional, Guimaraes, Bruno Pinto Braga, additional, and Silva, Carlos Henrique da, additional

Published
2018
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18. Stability Analysis of a DC MicroGrid for a Smart Railway Station Integrating Renewable Sources.

Author

Perez, Filipe, Iovine, Alessio, Damm, Gilney, Galai-Dol, Lilia, and Ribeiro, Paulo F.

Subjects
MICROGRIDS, RENEWABLE energy sources, RAILROAD stations, REGENERATIVE braking, ELECTRIC power distribution grids, ACTIVE recovery
Abstract

A low-level distributed nonlinear controller for a DC MicroGrid integrated in a Smart Railway Station capable to recover trains’ braking energy is introduced in this paper. The DC MicroGrid is composed by a number of elements: two different types of renewable energy sources (regenerative braking energy recovery from the trains and photovoltaic panels), two kinds of storages acting at different time scales (a battery and a supercapacitor), a DC load representing an aggregation of all loads in the MicroGrid, and the connection with the main AC grid. The nonlinear model of the MicroGrid is introduced, and a complete stability analysis is investigated to the purpose to meet power balance and grid voltage stability requirements. An Input-to-State Stability (ISS)-like Lyapunov function is obtained with a System-of-Systems approach, and it is utilized to develop the control laws for the converters in order to fulfill the dedicated objective each of them has. Simulation results, showing the desired grid behavior using the proposed nonlinear control laws, are introduced and compared with classical Proportional Integral (PI) linear controllers, with respect to performances and parametric robustness. The DC MicroGrid is shown to be able to operate braking energy recovery while performing load feeding and renewable energy integration and guaranteeing a proper DC voltage profile. [ABSTRACT FROM AUTHOR]

Published
2020
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19. Unbalanced Frequency Dependent Load Flow for Microgrids

Author

Monteiro, Maira Ribas, primary, Reis Rodrigues, Yuri, additional, Schumann Minami, Joseph P.O, additional, Zambroni de Souza, A.C., additional, Ribeiro, Paulo F., additional, Wang, Liwei, additional, Eberle, Wilson, additional, and Bonatto, Benedito Donizeti, additional

Published
2018
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22. Supraharmonic analysis using subsampling

Author

Mendes, Thais Martins, primary, Duque, Carlos Augusto, additional, Silva, Leandro R. Manso, additional, Ferreira, Danton Diego, additional, Ribeiro, Paulo F., additional, Meyer, Jan, additional, and Grevener, Anne, additional

Published
2018
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35. A Complex-Valued Three-Phase Load Flow for Radial Networks: High-Performance and Low-Voltage Solution Capability.

Author

Sarmiento, Jonattan E., Alvez, Cristian A., de Nadai N., Bruno, Zambroni de Souza, Antonio Carlos, Carreno, Edgar M., and Ribeiro, Paulo F.

Subjects
RADIAL flow, LOW voltage systems, NEWTON-Raphson method, CALCULUS, JACOBIAN matrices, GROUNDWATER flow
Abstract

Load flow methods for distribution networks, such as backward forward sweep (BFS) have a good computational performance and can find solutions with accuracy. However, some studies may demand the determination of low voltage solutions, and this poses a problem for these methods since they cannot find these solutions due to convergence issues. This paper presents a load flow method based on a novel complex-valued formulation developed for distribution networks, which works well on radial topologies by using an incidence matrix to avoid complicated series element models, allow high-performance and low-voltage solution capability. The formulation is solved by Newton's method via Wirtinger's calculus. To prove the low-voltage solution capability, both sides of QV curves, i.e., unstable and stable regions were traced on balanced and unbalanced networks. Performance tests in the IEEE test feeders show that the runtime is less than or equal to the runtime of the BFS method. Furthermore, the line R/X ratio and the number of controlled voltage node or volt-var functions do not affect the computational performance, yielding advantages over the classic Newton and BFS methods. [ABSTRACT FROM AUTHOR]

Published
2019
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36. A Benchmark Test System to Evaluate Methods of Harmonic Contribution Determination.

Author

Papic, Igor, Matvoz, Dejan, Spelko, Aljaz, Xu, Wilsun, Wang, Yang, Mueller, Dave, Miller, Carl, Ribeiro, Paulo F., Langella, Roberto, and Testa, Alfredo

Subjects
ELECTRIC potential, ELECTRIC inverters, ELECTRIC currents, ELECTRIC power systems, HARMONIC analysis (Mathematics), SIMULATION methods & models
Abstract

Harmonic distortions at a point of common coupling (PCC) are caused by the harmonic sources in both supply system and customer facilities. In order to verify compliance with harmonic limits for an operating facility, it is essential to determine the contribution of a facility to the harmonic distortions measured at the PCC. Over the past many years, a significant amount of research work has been conducted in developing different harmonic analysis methods and especially harmonic contribution assessment methods. A common need of this line of research is consistent test systems that can be used to verify/validate a proposed method or to compare different approaches. To address this gap, a benchmark test system representing a typical medium-voltage/low-voltage network supplying industrial loads is proposed in this paper. This paper also includes examples on how to use the system to assess the performance of harmonic contribution determination methods. [ABSTRACT FROM AUTHOR]

Published
2019
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