Blar i Institutt for elkraftteknikk på tidsskrift "Energy Procedia"
Viser treff 1-20 av 26
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A Case Study on Medium-Term Hydropower Scheduling with Sales of Capacity
(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 Modular Series Connected Converter for a 10 MW, 36 kV, Transformer-Less Offshore Wind Power Generator Drive
(Journal article; Peer reviewed, 2012)In the future, large offshore wind turbines are expected to reach a rating of 10 MW. To reduce the corresponding weight increase of the nacelle, research has started to focus on solutions to omit the step-up transformer ... -
A Simple Procedure to Evaluate the Efficiency and Power Density of Power Conversion Topologies for Offshore Wind Turbines
(Journal article; Peer reviewed, 2012)The prospective development of the offshore wind energy conversion system is mainly promoted by demand for higher efficiency and power density. This paper describes a simple procedure to calculate the efficiency and power ... -
Assessing the impact of sampling and clustering techniques on offshore grid expansion planning
(Journal article; Peer reviewed, 2017)Due to the ongoing large-scale connection of non-dispatchable renewable energy sources to the power systems, short- to long-term planning models are challenged by an increasing level of variability and uncertainty. A key ... -
Challenges and Rationale for Laboratory Research of Offshore Grids
(Journal article; Peer reviewed, 2012)Offshore power systems will be characterized by a large penetration of power electronics converters and power cables, resulting in complex behaviors that can be quite different from traditional AC systems. Analyzing such ... -
Control of HVDC systems based on diode rectifier for offshore wind farm applications
(Journal article; Peer reviewed, 2017)The transfer of energy from offshore wind farms using HVDC technology is highly dependant on the converter technology used. The conversion through HVDC has conventionally been done by Line Commutated Converters (LCC) or ... -
Cross-border Transfer of Electric Power Under Uncertainty: A Game of Incomplete Information
(Journal article; Peer reviewed, 2014)Cross-border transfer of electric power promotes collaboration in power generation between integrated electricity markets. It resolves grid reinforcement issues in existing transmission networks. Because of that, researchers ... -
Economic analysis of large-scale pumped storage plants in Norway
(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. ... -
Experimental Verification of a Voltage Droop Control for Grid Integration of Offshore Wind Farms Using Multi-terminal HVDC
(Journal article; Peer reviewed, 2014)This paper presents an experimental verification of a voltage droop control for a multi-terminal HVDC system for the grid integration of offshore wind farms. The laboratory setup is composed by four voltage-source converter ... -
Generator response following as a primary frequency response control strategy for VSC-HVDC connected offshore wind farms
(Journal article; Peer reviewed, 2017)As penetration of renewable energy sources increases, the proportion of synchronous generators with rotating masses directly coupled to the grid decreases. In the case of wind generation, the kinetic energy stored in the ... -
Identifying operational requirements for flexible CCS plant in future energy systems
(Journal article; Peer reviewed, 2016)This paper aims at a discussion of operational requirements for thermal power plants with carbon capture and storage in terms of their interaction with the power system, in regions with high penetration of variable renewable ... -
Implementing Hydropower Scheduling in a European Expansion Planning Model
(Journal article; Peer reviewed, 2014)A method for implementing an enhanced hydropower planning formulation in a long-term expansion planning model is proposed. The methodological framework involves assigning hydropower generation a marginal cost through water ... -
Integrated Modelling Platform for Dynamic Performance Assessment of Floating Wind Turbines
(Peer reviewed; Journal article, 2015)The paper presents an integrated modelling platform that can be used to assess the dynamic performance of an offshore wind turbine mounted on a spar-buoy type floater. Sub-models of generator and converter controllers and ... -
Investigation on Fault-ride through Methods for VSC-HVDC Connected Offshore Wind Farms
(Journal article; Peer reviewed, 2016)This paper proposes a novel fault-ride through method for offshore wind farms connected to grid through a voltage source converter (VSC)-based high voltage direct current (HVDC) transmission. The proposed method introduces ... -
Joint Modelling of Wind Power and Hydro Inflow for Power System Scheduling
(Peer reviewed; Journal article, 2016)This paper concerns the joint modelling of wind power and hydro inflow for long-term power system scheduling. We propose a vector autoregressive model applied to deseasonalized series to describe the joint generating ... -
Laboratory Verification of the Modular Converter for a 100 kV DC Transformerless Offshore Wind Turbine Solution
(Journal article; Peer reviewed, 2013)In this paper, an experimental verification of the control of a modular series connected voltage source converter suitable for an HVDC transformerless offshore wind turbine is presented. The test bench is built around a ... -
Large Superconducting Wind Turbine Generators
(Journal article; Peer reviewed, 2012)To realize large (>10 MW) direct-driven off-shore wind turbines, a number of steps are needed to reduce weight and cost compared to on-shore technologies. One of the major challenges is to provide drive trains which can ... -
Measured load profiles and heat use for “low energy buildings” with heat supply from district heating
(Journal article; Peer reviewed, 2017)In the development towards nearly zero energy buildings (nZEB) the load profiles for the heat demand and the heat use of the buildings are expected to be changed considerably compared to the situation today. This change ... -
Multiphysics 3D Modelling of Ironless Permanent Magnet Generators
(Journal article; Peer reviewed, 2014)Abstract Analytical method is widely used for the preliminary design and optimization of electrical machines. It has short calculation time and low computational cost (cost of simulation codes and supporting hardware), but ... -
Multistage grid investments incorporating uncertainty in offshore wind development
(Journal article; Peer reviewed, 2017)Representation of uncertainty in transmission expansion planning (TEP) models has become increasingly important as many power systems are exposed to significant technological changes induced by top-down climate and energy ...