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Detalhes

Detalhes

  • Nome

    Leonel Magalhães Carvalho
  • Cluster

    Energia
  • Cargo

    Responsável de Área
  • Desde

    18 fevereiro 2008
029
Publicações

2022

Multi-objective identification of critical distribution network assets in large interruption datasets

Autores
Marcelino, CG; Torres, V; Carvalho, L; Matos, M; Miranda, V;

Publicação
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS

Abstract
Performance indicators, such as the SAIFI and the SAIDI, are commonly used by regulatory agencies to evaluate the performance of distribution companies (DisCos). Based on such indicators, it is common practice to apply penalties or grant rewards if the indicators are greater to or less than a given threshold. This work proposes a new multi-objective optimization model for pinpointing the critical assets involved in outage events based on past performance indicators, such as the SAIDI and the System Average Interruption Duration Exceeding Threshold (SAIDET) indexes. Our approach allows to retrieve the minimal set of assets in large historical interruption datasets that most contribute to past performance indicators. A case study using a real interruption dataset between the years 2011–2104 from a Brazilian DisCo revealed that the optimal inspection plan according to the decision maker preferences consist of 332 equipment out of a total of 5873. This subset of equipment, which contribute 61.90% and 55.76% to the observed SAIFI and SAIDET indexes in that period, can assist managerial decisions for preventive maintenance actions by prioritizing technical inspections to assets deemed as critical. © 2021

2021

Optimal Power Flow Solution for Distribution Networks using Quadratically Constrained Programming and McCormick Relaxation Technique

Autores
Javadi, MS; Gouveia, CS; Carvalho, LM; Silva, R;

Publicação
2021 21ST IEEE INTERNATIONAL CONFERENCE ON ENVIRONMENT AND ELECTRICAL ENGINEERING AND 2021 5TH IEEE INDUSTRIAL AND COMMERCIAL POWER SYSTEMS EUROPE (EEEIC/I&CPS EUROPE)

Abstract

2021

An unsupervised approach for fault diagnosis of power transformers

Autores
Dias, L; Ribeiro, M; Leitao, A; Guimaraes, L; Carvalho, L; Matos, MA; Bessa, RJ;

Publicação
QUALITY AND RELIABILITY ENGINEERING INTERNATIONAL

Abstract
Electrical utilities apply condition monitoring on power transformers (PTs) to prevent unplanned outages and detect incipient faults. This monitoring is often done using dissolved gas analysis (DGA) coupled with engineering methods to interpret the data, however the obtained results lack accuracy and reproducibility. In order to improve accuracy, various advanced analytical methods have been proposed in the literature. Nonetheless, these methods are often hard to interpret by the decision-maker and require a substantial amount of failure records to be trained. In the context of the PTs, failure data quality is recurrently questionable, and failure records are scarce when compared to nonfailure records. This work tackles these challenges by proposing a novel unsupervised methodology for diagnosing PT condition. Differently from the supervised approaches in the literature, our method does not require the labeling of DGA records and incorporates a visual representation of the results in a 2D scatter plot to assist in interpretation. A modified clustering technique is used to classify the condition of different PTs using historical DGA data. Finally, well-known engineering methods are applied to interpret each of the obtained clusters. The approach was validated using data from two different real-world data sets provided by a generation company and a distribution system operator. The results highlight the advantages of the proposed approach and outperformed engineering methods (from IEC and IEEE standards) and companies legacy method. The approach was also validated on the public IEC TC10 database, showing the capability to achieve comparable accuracy with supervised learning methods from the literature. As a result of the methodology performance, both companies are currently using it in their daily DGA diagnosis.

2020

Aggregated dynamic model of active distribution networks for large voltage disturbances

Autores
Fulgencio, N; Moreira, C; Carvalho, L; Lopes, JP;

Publicação
ELECTRIC POWER SYSTEMS RESEARCH

Abstract

2020

A Hierarchical Optimization Strategy for Energy Scheduling and Volt/var Control in Autonomous Clusters of Microgrids

Autores
Castro, MV; Moreira, C; Carvalho, LM;

Publicação
IET RENEWABLE POWER GENERATION

Abstract

Teses
supervisionadas

2019

MOCAPIRA - Monte Carlo parallel implementation for reliability assessment

Autor
Inês Maria Afonso Trigo de Freitas Alves

Instituição
UP-FEUP

2018

Sistema didático de uma unidade industrial de processos discretos

Autor
Daniel Filipe de Azeredo Silva

Instituição
UP-FEUP

2017

Veículos Elétricos: Impactos na Rede Elétrica

Autor
Tiago Luís Ventura Araújo

Instituição
UTAD