CPES - Indexed Articles in Journals

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Browsing CPES - Indexed Articles in Journals by Author "3348"
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    An advanced platform for power system security assessment accounting for forecast uncertainties
    ( 2019) Ciapessoni,E ; Cirio,D ; Pitto,A ; Omont,N ; Leonel Magalhães Carvalho ; Vasconcelos,MH ; 3348 ; 4971
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    Dynamic security of islanded power systems with pumped storage power plants for high renewable integration – A study case
    ( 2019) Helena Vasconcelos ; Beires,P ; Carlos Moreira ; João Peças Lopes ; 1103 ; 3348 ; 4442
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    A methodology to evaluate the uncertainties used to perform security assessment for branch overloads
    ( 2019) Helena Vasconcelos ; Carla Silva Gonçalves ; Meirinhos,J ; Omont,N ; Pitto,A ; Ceresa,G ; 6595 ; 3348
    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
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    Stability of autonomous power systems with reversible hydro power plants: A study case for large scale renewables integration
    ( 2018) Pedro Portela Beires ; João Peças Lopes ; Carlos Moreira ; Helena Vasconcelos ; 4442 ; 1103 ; 3348 ; 6829
    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.