Browsing NTNU Open by Author "Øyvang, Thomas"
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The Energy Transition's Impact on the Accumulated Average Efficiency of Large Hydrogenerators
Karekezi, Yannick Cyiza; Øyvang, Thomas; Nøland, Jonas Kristiansen (Peer reviewed; Journal article, 2022)The energy transition is aimed to take advantage of the operational flexibility of hydropower to extend the integration of intermittent renewable sources. Consequently, the hydrogenerators will have to operate in regimes ... -
Enhanced Power Capability of Generator Units for Increased Operational Security using NMPC
Øyvang, Thomas; Nøland, Jonas Kristiansen; Sharma, Roshan; Hegglid, Gunne John; Lie, Bernt (Journal article; Peer reviewed, 2019)The ever-increasing penetration of intermittent energy sources introduces new demanding operating regimes for the bulk power generation in the power grid. During a worst-case power system disturbance scenario, the generator ... -
Evaluating the Precision of the DC Decay Test Method for Characterizing Wound-Field Synchronous Machines in Power Plants
Maurer, Frédéric Michael; Øyvang, Thomas; Nøland, Jonas Kristiansen (Peer reviewed; Journal article, 2023)The sudden short-circuit test is the gold standard for determining the equivalent diagram of wound-field synchronous machines (WFSMs). Only a single measurement is needed while the machine is in saturated mode. However, ... -
Future Operational Regimes of Bulk Power Generation in The Era of Global Energy Transition: Grid Codes, Challenges and Open Issues
Nøland, Jonas Kristiansen; Leandro, Matteo; Nysveen, Arne; Øyvang, Thomas (Chapter, 2020)This paper explores the effects of the ongoing energy transition on the classical bulk power generation. The rapid increase in renewable penetration changes the role of grid-connected generators significantly. Large machines ... -
Loss Modeling of Large Hydrogenerators for Cost Estimation of Reactive Power Services and Identification of Optimal Operation
Karekezi, Yannick Cyiza; Melfald, Emil Ghieh; Øyvang, Thomas; Nøland, Jonas Kristiansen (Peer reviewed; Journal article, 2022)As a result of the worldwide energy transition, reactive power generation has started to become a more scarce resource in the power grid. Until recently, reactive power has been an auxiliary grid service that classical ... -
Thermal Mapping of the Hydrogenerator’s Reactive Power Boosting Ability at Various Time Windows
Robles, Dany Josue Tome; Nøland, Jonas Kristiansen; Maurer, Frédéric Michael; Øyvang, Thomas (Chapter, 2023)In the future, bulk power generation facilities like large hydropower plants need to be utilized more flexibly and provide extended services over shorter time intervals. This work presents a comprehensive thermal mapping ...