Browsing Documental Repository by Author "214"
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ItemThe challenges of estimating the impact of distributed energy resources flexibility on the TSO/DSO boundary node operating points( 2018) Luís Seca ; Vladimiro Miranda ; Manuel Matos ; João Vieira Silva ; Jean Sumaili ; Ricardo Jorge Bessa ; 4417 ; 208 ; 214 ; 4882 ; 6299 ; 5164The 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.
ItemDimensioning Studies for Reversible Hydro Power Plants in Portuguese Islands( 2018) Manuel Matos ; Nuno Soares Fonseca ; André Guimarães Madureira ; João Peças Lopes ; 1103 ; 214 ; 5517 ; 4560This work is within the scope of set of consultancy studies made for Portuguese islands. It focuses on the integration of Pumped Storage Power in isolated islands. The paper starts to address several power systems circumstances about two Portuguese islands on the energetic level. For each of these islands, an independent examination of the conditions to install a reversible hydro power plant is accomplished. Therefore, the energy volume to be stored due to excess of renewable generation and the ideal power and number of the pumps and turbines to be installed were identified and evaluated for the sake of using the produced energy surplus as to be pumped and later generated. The paper enhances the importance of storing energy in the operation of isolated and small systems with considerable amount of intermittent power resources as well as the conditions for the viability of installing new exploitations of this kind.
ItemEstimating the Active and Reactive Power Flexibility Area at the TSO-DSO Interface( 2018) João Vieira Silva ; Sebastian Viana,M ; Goncer,B ; Caujolle,M ; Vladimiro Miranda ; Manuel Matos ; Seca,L ; Ricardo Jorge Bessa ; Sumaili,J ; 6299 ; 4882 ; 208 ; 214
ItemOptimal bidding strategy for an aggregator of prosumers in energy and secondary reserve markets( 2019) Manuel Matos ; José Pedro Iria ; Filipe Joel Soares ; 5485 ; 4999 ; 214