Blar i NTNU Open på forfatter "Helseth, Arild"
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A Case Study on Medium-Term Hydropower Scheduling with Sales of Capacity
Hjelmeland, Martin N.; Helseth, Arild; Korpås, Magnus (Peer reviewed; Journal article, 2016)This paper conducts a case study on hydropower scheduling considering sales of capacity reserves and impacts of detailed mod-elling. In latter years a growing demand for reserve capacity has been needed to ensure stable ... -
A Parallel Solution to Large Scale Hydropower Scheduling - By reducing the number of synchronization points in the Stochastic Dual Dynamic Programming (SDDP) Algorithm
Braaten, Hallvard (Master thesis, 2014)Stochastic dual dynamic programming (SDDP) has become a popular algorithm used in practical long-term scheduling of hydro power systems. The SDDP algorithm is significantly more computationally demanding than most ... -
Accounting for reserve capacity activation when scheduling a hydropower dominated system
Naversen, Christian Øyn; Farahmand, Hossein; Helseth, Arild (Journal article; Peer reviewed, 2020)As the penetration of variable renewable power generation increases in power systems around the world, system security is challenged. It is crucial to coordinate the available flexible generating resources, such as hydropower, ... -
Assessing the benefits of exchanging spinning reserve capacity within the hydro-Dominated nordic market
Helseth, Arild; Haugen, Mari; Farahmand, Hossein; Mo, Birger; Jaehnert, Stefan; Stenkløv, Inge (Peer reviewed; Journal article, 2021)This paper presents a hydrothermal scheduling toolchain suitable for detailed studies of procurement of spinning reserves in the hydro-dominated Nordic power system. The toolchain combines a long-term model to find the ... -
Continuous-time scheduling of a hydrothermal system with integration of offshore wind power
Øvstebø, Mari Lund; Naversen, Christian Øyn; Helseth, Arild; Farahmand, Hossein (Chapter, 2020)In this work, a continuous-time unit commitment formulation of a hydrothermal system with integration of offshore wind power is used to model the North European system operation. The cost of covering the structural imbalances ... -
Economic analysis of large-scale pumped storage plants in Norway
Henden, Arild Lothe; Doorman, Gerard L.; Helseth, Arild (Peer reviewed; Journal article, 2016)The European power system needs to develop mechanisms to compensate for the reduced predictability and high variability that occur when integrating renewable energy. Construction of pumped storage plant (PSP) is a solution. ... -
Environmental Constraints in Seasonal Hydropower Scheduling - Survey and Feasibility
Helseth, Arild (HydroCen Report;12, Research report, 2019)The work documented in this report has been carried out in project WP3.4 in the HydroCen research center. We have surveyed the need for improved modelling of environmental and technical constraints related to operational ... -
Flow-Based Market Coupling in Short-Term Hydro-Thermal Scheduling
Meberg, Torbjørn Røed (Master thesis, 2019)Flyten av kraft i det nordiske kraftsystemet er under endring, der det er en økning i produksjon fra fornybare energikilder i tillegg til en elektrifisering av ulike deler av industrisektoren, som forandrer sammensetningen ... -
Fundamental Multi-Product Price Forecasting in Power Markets
Jaehnert, Stefan; Helseth, Arild; Naversen, Christian Øyn (SINTEF Rapport;, Research report, 2019)This report has been prepared in the first phase of the project 'Pricing Balancing Services in the Future Nordic Power Market1, and its purpose is two-fold. First, a review on expected future trends in European power markets ... -
Hydro-Thermal Multi-Market Optimization
Nordén, Siri Hartvedt (Master thesis, 2019)Fundamental optimering av kraftsystemet er essensielt for å anskaffe korrekt beslutningsstøtte for investeringer og for optimal drift av kraftsystemet. Med en økt andel av ukontrollerbare energikilder og utfasing av kull ... -
Hydrothermal scheduling in the continuous-time framework
Naversen, Christian Øyn; Helseth, Arild; Li, Bosong; Parvania, Masood; Farahmand, Hossein; Catalao, João P.S. (Peer reviewed; Journal article, 2020)Continuous-time optimization models have successfully been used to capture the impact of ramping limitations in power systems. In this paper, the continuous-time framework is adapted to model flexible hydropower resources ... -
Impact of Modelling Details on the Generation Function for a Norwegian Hydropower Producer
Hjelmeland, Martin N.; Helseth, Arild; Korpås, Magnus (Journal article; Peer reviewed, 2018)In the following work the generation function relating water discharge to power output for a hydropower station is considered. The conventional approach to modelling the generation function has been to simplify it as a ... -
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 ...