Vanderlei Silva - Academia.edu (original) (raw)

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Papers by Vanderlei Silva

Brazilian Archives of Biology and Technology

Microgrids (MGs) have increasingly attracted the attention of researchers, government officials, ... more Microgrids (MGs) have increasingly attracted the attention of researchers, government officials, and electricity companies for the values and services they can add to the grid. They can operate independently as a single controllable unit in a coordinated way while connected or islanded, which make them suitable to integrate the growing amount of distributed energy resources (DERs) into the distribution network (DN). An active distribution network with high penetration of DERs could be redefined into a collection of microgrids in different layers, pooling their resources together to enhance the grid's performance in the sense of electricity as a service. However, enabling a microgrid-based power system infrastructure poses challenges concerning operation and control. In this paper, a comprehensive overview of research topics regarding microgrid operation are shown in a hierarchical or stratified manner, looking for a holistic vision of a microgrid-based distribution system. First, multi-objective optimization within one microgrid is formulated aiming to minimize costs and maximize battery life is presented. Second, the interaction among MGs, DERs and the DN was modeled using the OPF technique to represent the operation of the grid as a whole. HIGHLIGHTS  Efforts in research to enable a microgrid-based power system infrastructure are shown.  In a first level, by the optimization of the assets within a microgrid via multi-objective optimization;  In a second level, by the optimization of microgrid while connected to the main grid via OPF analysis;  In a third level, by the optimization of multi-microgrids connected together and to the grid.  Alternatively, by considering decentralized energy markets as an integration approach. Machado, M.; et al.

Eighth IEEE International Symposium on Spread Spectrum Techniques and Applications - Programme and Book of Abstracts (IEEE Cat. No.04TH8738), 2004

An ergodic simulation model for the generation of multiple time uncorrelated Rayleigh waveforms w... more An ergodic simulation model for the generation of multiple time uncorrelated Rayleigh waveforms with correct ensemble averages is proposed. This model uses the inverse discrete Fourier transform to generate the transmission coefficients with only one random number generator. Two recent modified versions of the Jake's and Smith's models, with correct ensemble averages, are analysed and compared with the proposed model.

CDMA topology, adapted for multipath fading channels; particularly, we have analysed the performa... more CDMA topology, adapted for multipath fading channels; particularly, we have analysed the performance under COST259DCM channels via Monte Carlo simulation (MCS).

Fading communication channel models found in literature can be described in the time domain [4], ... more Fading communication channel models found in literature can be described in the time domain [4], [2] or frequency domain [5]. If computer simulation is the employed method the choice between each other method can be based in the processing time and or implementation easiness. This work presents a new sample generation method, applicable to Rayleigh multipath fading channel, named

Brazilian Archives of Biology and Technology

Microgrids (MGs) have increasingly attracted the attention of researchers, government officials, ... more Microgrids (MGs) have increasingly attracted the attention of researchers, government officials, and electricity companies for the values and services they can add to the grid. They can operate independently as a single controllable unit in a coordinated way while connected or islanded, which make them suitable to integrate the growing amount of distributed energy resources (DERs) into the distribution network (DN). An active distribution network with high penetration of DERs could be redefined into a collection of microgrids in different layers, pooling their resources together to enhance the grid's performance in the sense of electricity as a service. However, enabling a microgrid-based power system infrastructure poses challenges concerning operation and control. In this paper, a comprehensive overview of research topics regarding microgrid operation are shown in a hierarchical or stratified manner, looking for a holistic vision of a microgrid-based distribution system. First, multi-objective optimization within one microgrid is formulated aiming to minimize costs and maximize battery life is presented. Second, the interaction among MGs, DERs and the DN was modeled using the OPF technique to represent the operation of the grid as a whole. HIGHLIGHTS  Efforts in research to enable a microgrid-based power system infrastructure are shown.  In a first level, by the optimization of the assets within a microgrid via multi-objective optimization;  In a second level, by the optimization of microgrid while connected to the main grid via OPF analysis;  In a third level, by the optimization of multi-microgrids connected together and to the grid.  Alternatively, by considering decentralized energy markets as an integration approach. Machado, M.; et al.

Eighth IEEE International Symposium on Spread Spectrum Techniques and Applications - Programme and Book of Abstracts (IEEE Cat. No.04TH8738), 2004

An ergodic simulation model for the generation of multiple time uncorrelated Rayleigh waveforms w... more An ergodic simulation model for the generation of multiple time uncorrelated Rayleigh waveforms with correct ensemble averages is proposed. This model uses the inverse discrete Fourier transform to generate the transmission coefficients with only one random number generator. Two recent modified versions of the Jake's and Smith's models, with correct ensemble averages, are analysed and compared with the proposed model.

CDMA topology, adapted for multipath fading channels; particularly, we have analysed the performa... more CDMA topology, adapted for multipath fading channels; particularly, we have analysed the performance under COST259DCM channels via Monte Carlo simulation (MCS).

Fading communication channel models found in literature can be described in the time domain [4], ... more Fading communication channel models found in literature can be described in the time domain [4], [2] or frequency domain [5]. If computer simulation is the employed method the choice between each other method can be based in the processing time and or implementation easiness. This work presents a new sample generation method, applicable to Rayleigh multipath fading channel, named