Blar i NTNU Open på forfatter "Helseth, Arild"
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Long-term Scheduling of Hydro Power Systems in Multiple Markets
Hjelmeland, Martin Nødland (Master thesis, 2015)Hydropower scheduling models are vital for achieving an optimal utilization of water stored in reservoirs. The high percentage of flexible hydropower generation in Norway has led to scarce volumes in the reserve markets, ... -
Medium-Term hydropower scheduling with variable head under inflow, energyand reserve capacity price uncertainty
Hjelmeland, Martin N.; Helseth, Arild; Korpås, Magnus (Journal article; Peer reviewed, 2019)We propose a model for medium-term hydropower scheduling (MTHS) with variable head and uncertainty in inflow, reserve capacity, and energy price. With an increase of intermittent energy sources in the generation mix, it ... -
Modelling of Environmental Constraints for Hydropower Optimization Problems – a Review
Schaffer, Linn Emelie; Adeva Bustos, Ana; Bakken, Tor Haakon; Helseth, Arild; Korpås, Magnus (Chapter, 2020)Hydropower plants and reservoirs can have negative impacts on their surrounding ecosystems. To limit such impacts, environmental regulations may be imposed. This paper provides a review of literature on the most commonly ... -
Modelling Reliability of Supply and Infrastructural Dependency in Energy Distribution Systems
Helseth, Arild (Doktoravhandlinger ved NTNU, 1503-8181; 2008:87, Doctoral thesis, 2008)This thesis presents methods and models for assessing reliability of supply and infrastructural dependency in energy distribution systems with multiple energy carriers. The three energy carriers of electric power, natural ... -
Multi-Market Optimization of Energy Storage Taking Into Account Uncertainty
Thorvaldsen, Kasper Emil (Master thesis, 2018)In this master thesis, the main focus has been to create an optimization model for an energy storage unit to consider the potential of storing energy for future use, when also operating in both the energy and balancing ... -
Multi-Market Price Forecasting in Hydro-Thermal Power Systems
Helseth, Arild; Haugen, Mari; Jaehnert, Stefan; Mo, Birger; Farahmand, Hossein; Naversen, Christian Øyn (Chapter, 2018)This paper presents a framework for price forecasting in hydro-thermal power systems. The framework consists of a long-term strategic and a short-term operational model. The strategic model provides the end-of-horizon ... -
Nonconvex Medium-Term Hydropower Scheduling by Stochastic Dual Dynamic Integer Programming
Hjelmeland, Martin N.; Zou, Jikai; Helseth, Arild; Ahmed, Shabbir (Journal article; Peer reviewed, 2018)Hydropower producers rely on stochastic optimization when scheduling their resources over long periods of time. Due to its computational complexity, the optimization problem is normally cast as a stochastic linear program. ... -
Operating a Battery in a Hydropower-Dominated System to Balance Net Load Deviations
Naversen, Christian Øyn; Bjarghov, Sigurd; Helseth, Arild (Chapter, 2019)Decreasing costs of battery storage technologies make them a viable option for providing flexibility in power systems. In this paper, we study the operations of a battery in combination with cascaded hydropower in a system ... -
Optimal Operation of Hydro-Dominated Power Systems with Environmental Constraints
Schäffer, Linn Emelie; Korpås, Magnus; Helseth, Arild (Chapter, 2022)This paper studies the operation of a small renewable and hydro-dominated power system when introducing environmental constraints. The risk of rationing and the local price formation is investigated using a stochastic, ... -
Pre‐project: Fundamental modelling of a 100 % renewable electricity system
Helseth, Arild; Mo, Birger (HydroCen brief;Nr. 15, Report, 2022)The memo summarizes the literature review that was carried out as part of the development of the KSP application "RES – Modelling a 100% Renewable Electricity System". -
Ramping Constraints in Hydropower Scheduling: With application in the SDDP-based ProdRisk model
Helseth, Arild; Rex, Stefan (HydroCen Rapport;39, Research report, 2023)Ramping constraints on water flows in hydropower systems may, e.g., ensure the preservation of ecological conditions, safely operate river systems, and prevent unfavorable ice formation. In this work we study how ramping ... -
A stochastic dynamic programming model for hydropower scheduling with state-dependent maximum discharge constraints
Schäffer, Linn Emelie; Helseth, Arild; Korpås, Magnus (Peer reviewed; Journal article, 2022)We present a medium-term hydropower scheduling model that includes inflow- and volume-dependent environmental constraints on maximum discharge. A stochastic dynamic programming algorithm (SDP) is formulated to enable an ... -
Strengthened Benders cuts for treatment of state‐dependent discharge in ProdRisk
Helseth, Arild; Mathisen, Siri (HydroCen brief;Nr. 10, Report, 2021) -
Structural Vulnerability of Energy Distribution Systems; Incorporating Infrastructural Dependencies
Helseth, Arild; Holen, Arne T (Journal article; Peer reviewed, 2008)In this paper a method for assessing the structural vulnerability of two coupled energy distribution systems is proposed. The co-existing of an electric power distribution system and a district heating system is described ...