Paulo Ribeiro


Models and Paradigm Shifts: Past, Present and Future of Smart Energy Systems

The deregulation of the energy market, combined with the emerging transmission, distribution, and information technology, provided strategic opportunities for new knowledge, developments, and services for the power grid. The new evolving context created over the last four decades a revolution within the electrical energy sector. These changes have many times produced incremental improvements, and other times new models and wide-ranging paradigm shifts. Widespread integration of renewables, advances in power electronics and signal processing, together with the ample use of artificial intelligence have created unthinkable transformations. The unfolding of the electric grid model is not simple progress from error to truth. No model is a catalog of ultimate realities, and none is a mere fantasy. The presentation will highlight some of these transitions from both technological and philosophical perspectives.

The Systems Engineering Side Holistic Normative Engineering Design For Smarter Electric Grids

The presentation will cover the following topics:

  • Architectures of Reference – Something Missing?
  • Objectives, Problems, Analytical Tools
  • Philosophy of Technology: All Social Perspectives
  • Engineering Systems: All Engineering Macro Systems
  • Systems Engineering: All Engineering Processes
  • Design Criteria: All Design Characteristics
  • Modal Aspects
  • An Attempt to See the the Issue from a Holistic Way – Smarter Living
  • The Holistic Normative Engineering Design – To Be Completed
  • Technology and Poetry
  • Conclusions
Observations on Harmonics Summation in Transmission Systems: Alternative Aggregation Estimation

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 behavior of harmonic currents that a/ect 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 modeled 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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