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Sobre

Tenho uma graduação em Ciências Aplicada (Eletricidade) pela universidade de Kinshasa, Kinshasa, Republica Democrática do Congo (1998). Recebi o grau de Mestre e de Doutor en Engenharia Elétrica pelo Politécnico de Turim, Turim, Itália, em 2004 e 2008, respetivamente.

Durante 15 meses, trabalhei com Investigador num projeto cofinanciado pela Região Piemonte e o Politecnico de Turim – Departamento de Engenharia Elétrica (PVENAS – A procedure based on experimental testing and meteo-database processing to assess the yearly energy production of grid-connected photovoltaic systems) sobre os métodos de avaliação de desempenho de instalações solares fotovoltaicas.

Trabalho como Investigador Sénior do Centro de Sistemas de Energia desde julho de 2009.

A minhas competências incluem:

  • Modelagem e análise de Redes de Distribuição
  • Aplicações da geração distribuída
  • Classificação de consumidores d’Eletricidade
  • Previsão de Carga e de geração
  • Integração das Energias renováveis (nomeadamente, energia eólica e energia solar fotovoltaica)
  • Otimização da operação e do planeamento das Redes de Distribuição tendo em conta a incerteza e a flexibilidade de recursos (incluindo Micro-Redes e Redes inteligentes)
  • Desenvolvimento de ferramentas

Tópicos
de interesse
Detalhes

Detalhes

  • Nome

    Jean Sumaili
  • Cluster

    Energia
  • Cargo

    Investigador Afiliado
  • Desde

    17 julho 2009
004
Publicações

2018

The challenges of estimating the impact of distributed energy resources flexibility on the TSO/DSO boundary node operating points

Autores
Silva, J; Sumaili, J; Bessa, RJ; Seca, L; Matos, M; Miranda, V;

Publicação
Computers and Operations Research

Abstract
The increasing penetration of renewable energy sources characterized by a high degree of variability and uncertainty is a complex challenge for network operators that are obligated to ensure their connection while keeping the quality and security of supply. In order to deal with this variable behavior and forecast uncertainty, the distribution networks are equipped with flexible distributed energy resources capable of adjusting their operating point to avoid technical issues (voltage problems, congestion, etc.). Within this paradigm, the flexibility that, in fact, can be provided by such resources, needs to be estimated/forecasted up to the transmission network node (primary substation) and requires new tools for TSO/DSO coordination. This paper addresses this topic by developing a methodology capable of finding the flexibility area while taking into account the technical grid constraints. The proposed approach is based on the formulation of a single optimization problem which is run several times, according with the expected precision for the flexibility area estimation. To each optimization problem run, a different objective function belonging to a family of straight lines is assigned. This allows exploring the active and reactive power flow limits at the TSO/DSO boundary nodes - which define the flexibility area. The effectiveness of the proposed model has been evaluated on two test networks and the results suggest a step forward in the TSO/DSO coordination field. Nevertheless, further investigations to study the effect of assets with discrete control nature (e.g., on load tap changers - OLTC, capacitor banks) on the occurrence of disjoint flexibility areas should be carried. © 2017 Elsevier Ltd.

2017

Assessing the Impact of Demand Flexibility on Distribution Network Operation

Autores
Tavares, BD; Sumaili, J; Soares, FJ; Madureira, AG; Ferreira, R;

Publicação
2017 IEEE MANCHESTER POWERTECH

Abstract
This paper presents a study about the influence of Distributed Energy Resources' (DER) flexibility on the operation of a Medium Voltage (MV) network, in a Smart Grid (SG) environment. An AC multi-temporal Optimal Power Flow (OPF) tool was developed and used to simulate the impact of the DER flexibility (including storage devices, EVs, controllable loads and micro-generation) in distribution network operation. Some simulations are presented, demonstrating the impact that DER flexibility can have on solving operation problems namely in terms of branch loading and voltage limits.

2017

Mitigation in the Very Short-term of Risk from Wind Ramps with Unforeseen Severity

Autores
Pinto, M; Miranda, V; Saavedra, O; Carvalho, L; Sumaili, J;

Publicação
JOURNAL OF CONTROL AUTOMATION AND ELECTRICAL SYSTEMS

Abstract
This paper addresses a critical analysis of the impact of the wind ramp events with unforeseen magnitude in power systems at the very short term, modeling the response of the operational reserve against this type of phenomenon. A multi-objective approach is adopted, and the properties of the Pareto-optimal fronts are analyzed in cost versus risk, represented by a worst scenario of load curtailment. To complete this critical analysis, a study about the usage of the reserve in the event of wind power ramps is performed. A case study is used to compare the numerical results of the models based on stochastic programming and models that take a risk analysis view in the system with high level of wind power. Wind power uncertainty is represented by scenarios qualified by probabilities. The results show that the reliability reserve may not be adequate to accommodate unforeseen wind ramps and therefore the system may be at risk.

2017

Mean shift densification of scarce data sets in short-term electric power load forecasting for special days

Autores
Rego, L; Sumaili, J; Miranda, V; Frances, C; Silva, M; Santana, A;

Publicação
ELECTRICAL ENGINEERING

Abstract
Short-term load forecasting plays an important role to the operation of electric systems, as a key parameter for planning maintenances and to support the decision making process on the purchase and sale of electric power. A particular case in this respect is the consumption forecasting on special days, which can be a complex task as it presents unusual load behavior, when compared to regular working days. Moreover, its reduced number of samples makes it hard to properly train and validate more complex and nonlinear prediction algorithms. This paper tackles this problem by proposing a new approach to improve the accuracy of the predictions amidst existing special days, employing an Information Theoretic Learning Mean Shift algorithm for pattern discovery, classifying and densifying the available scarce consumption data. The paper describes how this methodology was applied to an electrical load forecasting problem in the northern region of Brazil, improving the previously obtained accuracy held by the power company.

2016

Assessing DER flexibility in a German distribution network for different scenarios and degrees of controllability

Autores
Silva, A; Carvalho, L; Bessa, R; Sumaili, J; Seca, L; Schaarschmidt, G; Silva, J; Matos, M; Hermes, R;

Publicação
IET Conference Publications

Abstract
This paper evaluates the flexibility provided by distributed energy resources (DER) in a real electricity distribution network in Germany. Using the Interval Constrained Power Flow (ICPF) tool, the maximum range of flexibility available at the primary substation was obtained for different operation scenarios. Three test cases were simulated, differing mainly in the considered level of renewable energy sources (RES) production. For each test case, the obtained results enabled the construction of flexibility areas that define, for a given operating point, the limits of feasible values for the active and reactive power that can be exchanged between the TSO and the DSO. Furthermore, the tool can also be used to evaluate the contribution from each type of DER to the overall distribution network flexibility.