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Sobre

Sou investigadora sénior do INESC TEC e Professora Auxiliar da FEUP. O meu trabalho tem-se focado no estudo do comportamento dinâmico e na análise de segurança de operação de sistemas elétricos, bem como na aplicação de técnicas de aprendizagem automática para obter uma operação ótima e segura nestes sistemas. Tenho participado em muitos projetos de consultoria, a maioria dos quais relacionados com a segurança dinâmica em sistemas elétricos isolados com uma elevada penetração de energias renováveis. Tenho também tido forte participação em projetos de Investigação e Desenvolvimento relacionados com a segurança de operação e controlo de sistemas elétricos.

Tópicos
de interesse
Detalhes

Detalhes

  • Nome

    Helena Vasconcelos
  • Cluster

    Energia
  • Cargo

    Investigador Sénior
  • Desde

    01 janeiro 1999
012
Publicações

2019

An advanced platform for power system security assessment accounting for forecast uncertainties

Autores
Ciapessoni, E; Cirio, D; Pitto, A; Omont, N; Carvalho, LM; Vasconcelos, MH;

Publicação
International Journal of Management and Decision Making

Abstract

2019

A methodology to evaluate the uncertainties used to perform security assessment for branch overloads

Autores
Vasconcelos, MH; Goncalves, C; Meirinhos, J; Omont, N; Pitto, A; Ceresa, G;

Publicação
International Journal of Electrical Power and Energy Systems

Abstract
This paper presents a generic framework to evaluate and compare the quality of the uncertainties provided by probabilistic forecasts of power system state when used to perform security assessment for branch overloads. Besides exploiting advanced univariate and multivariate metrics that are traditionally used in weather prediction, the evaluation is complemented by assessing the benefits from exploiting probabilistic forecasts over the current practices of using deterministic forecasts of the system operating conditions. Another important feature of this framework is the provision of parameters tuning when applying flow probabilistic forecasts to perform security assessment for branch overloads. The quality and scalability of this framework is demonstrated and validated on recent historical data of the French transmission system. Although being developed to address branch overload problems, with proper adaptations, this work can be extended to other power system security problems. © 2019 Elsevier Ltd

2019

Dynamic security of islanded power systems with pumped storage power plants for high renewable integration – A study case

Autores
Vasconcelos, MH; Beires, P; Moreira, CL; Pecas Lopes, JAP;

Publicação
The Journal of Engineering

Abstract

2019

Evaluation of the uncertainties used to perform flow security assessment: A real case study

Autores
Vasconcelos, MH; Gonçalves, C; Meirinhos, J; Omont, N; Pitto, A; Ceresa, G;

Publicação
2019 IEEE Milan PowerTech, PowerTech 2019

Abstract
In this paper, a validation framework is proposed to evaluate the quality of uncertainty forecasts, when used to perform branch flow security assessment. The consistency between probabilistic forecasts and observations and the sharpness of the uncertainty forecasts is verified with advanced metrics widely used in weather prediction. The evaluation is completed by assessing the added value of exploiting uncertainty forecasts over the TSO current practices of using deterministic forecasts. For electric power industry, this proposed validation framework provides a way to compare the performance among alternative uncertainty models, when used to perform security assessment in power systems. The quality of the proposed metrics is illustrated and validated on historical data of the French transmission system. © 2019 IEEE.

2018

Stability of autonomous power systems with reversible hydro power plants: A study case for large scale renewables integration

Autores
Beires, P; Vasconcelos, MH; Moreira, CL; Pecs Lopes, JAP;

Publicação
Electric Power Systems Research

Abstract
This paper addresses the dynamic stability analysis of an islanded power system regarding the installation of a reversible hydro power plant for increasing renewable energy integration. Being a high-head facility, the hydro power plant consists of separated pumps and turbines (Pelton type). In order to properly support the identification of hydro pumps connection requirements and the technology to be used, different options were taken into consideration, namely: fixed speed pumps coupled to induction machines directly connected to the grid and adjustable speed pumps supplied by a drive system. Extensive numerical simulations of the power system's dynamic behaviour response allowed the evaluation of the hydro power plant's role for the purpose of grid stability conditions. These simulations showed that the high-head hydro power installation provides a marginal contribution to system frequency regulation when explored in turbine operation mode, leading to a reversible power station with a single penstock. Moreover, due to the significant additional system load introduced by the hydro pumping units, the obtained results clearly indicate that supplementary regulation flexibility is required to attend the need of assuring the stable operation of the system in case of critical disturbances such as grid faults. The study case demonstrates that, although the foreseen operation of a reversible hydro power plant creates new security challenges to overcome in an autonomous power system, robust technical solutions can be identified without increasing, from the local system operator's perspective, the operation complexity of the power system. © 2018 Elsevier B.V.

Teses
supervisionadas

2016

Estudo de Condições de Viabilidade da Manutenção em Serviço de Produção Distribuída em Situações de Contingência na Rede AT

Autor
João Paulo Martins Santos Fernandes

Instituição
UP-FEUP

2016

Avaliação rápida de sobrecargas pós-contingência em ramos de sistemas elétricos interligados

Autor
Ricardo Jorge de Lima Capão

Instituição
UP-FEUP

2016

0

Autor
Rosária Maria Afonso Rodrigues de Melo

Instituição
UP-FCNA

2015

Avaliação Rápida de Sobrecargas Pós-Contingência em Ramos de Sistemas Elétricos Interligados

Autor
Ricardo Jorge de Lima Capão

Instituição
UP-FEUP