Browsing Brage NMBU by Author "Gorjão, Leonardo Rydin"
Now showing items 1-9 of 9
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Data-Driven Modeling of Frequency Dynamics Observed in Operating Microgrids: A South African University Campus Case Study
Maritz, Jacques; Gorjão, Leonardo Rydin; Bester, P. Armand; Esterhuysen, Nicolaas; Erasmus, Stefaans; Riekert, Stephanus; Immelman, Reuben; Geldenhuys, Tiaan; Viljoen, Alexandra; Bodenstein, Charl (Peer reviewed; Journal article, 2024)South Africa has been experiencing an energy crisis since 2007. Utility loadshedding became the main control for under-frequency events due to a mismatch in generation and consumption. Rolling blackouts are further supported ... -
Microscopic Fluctuations in Power-Grid Frequency Recordings at the Subsecond Scale
Schäfer, Benjamin; Gorjão, Leonardo Rydin; Yalcin, G. Cigdem; Förstner, Ellen; Jumar, Richard; Maass, Heiko; Kühnapfel, Uwe; Hagenmeyer, Veit (Peer reviewed; Journal article, 2023)Complex systems, such as the power grid, are essential for our daily lives. Many complex systems display multifractal behavior, correlated fluctuations and power laws. Whether the power-grid frequency, an indicator of the ... -
Modern AI versus century-old mathematical models: How far can we go with generative adversarial networks to reproduce stochastic processes?
Rego Lencastre e Silva, Pedro; Gjersdal, Marit; Gorjão, Leonardo Rydin; Yazidi, Anis; Lind, Pedro (Peer reviewed; Journal article, 2023) -
Multivariate scenario generation of day-ahead electricity prices using normalizing flows
Hilger, Hannes; Witthaut, Dirk; Dahmen, Manuel; Gorjão, Leonardo Rydin; Trebbien, Julius; Cramer, Eike (Peer reviewed; Journal article, 2024)Trading on the day-ahead electricity markets requires accurate information about the realization of electricity prices and the uncertainty attached to the predictions. Deriving accurate forecasting models presents a difficult ... -
Patterns and correlations in European electricity prices
Trebbien, Julius; Tausendfreund, Anton; Gorjão, Leonardo Rydin; Witthaut, Dirk (Peer reviewed; Journal article, 2024)Electricity markets are central to the coordination of power generation and demand. The European power system is divided into several bidding zones, each having an individual electricity market price. While individual price ... -
Stability Bounds of Droop-Controlled Inverters in Power Grid Networks
Böttcher, Philipp; Gorjão, Leonardo Rydin; Witthaut, Dirk (Peer reviewed; Journal article, 2023)The energy mix of future power systems will include high shares of electricity generation by wind turbines and solar photovoltaics. These generation facilities are generally connected via power-electronic inverters. While ... -
Stable stadial and interstadial states of the last glacial's climate identified in a combined stable water isotope and dust record from Greenland
Riechers, Keno; Gorjão, Leonardo Rydin; Hassanibesheli, Forough; Lind, Pedro; Witthaut, Dirk; Boers, Niklas (Peer reviewed; Journal article, 2023)During the last glacial interval, the Northern Hemisphere climate was punctuated by a series of abrupt changes between two characteristic climate regimes. The existence of stadial (cold) and interstadial (milder) periods ... -
The stochastic nature of power-grid frequency in South Africa
Gorjão, Leonardo Rydin; Maritz, Jacques (Journal article, 2023)In this work, we explore two mechanisms that explain non-Gaussian behaviour of power-grid frequency recordings in the South African grid. We make use of a Fokker–Planck approach to power-grid frequency that yields a direct ... -
Understanding electricity prices beyond the merit order principle using explainable AI
Trebbien, Julius; Gorjão, Leonardo Rydin; Praktiknjo, Aaron; Schäfer, Benjamin; Witthaut, Dirk (Journal article, 2023)Electricity prices in liberalized markets are determined by the supply and demand for electric power, which are in turn driven by various external influences that vary strongly in time. In perfect competition, the merit ...