Browsing Institutt for elkraftteknikk by Document Types "Chapter"
Now showing items 21-40 of 289
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Analysis of MMC Dynamics in DQZ Coordinates for Vertical and Horizontal Energy Balancing Control
(Chapter, 2018)This paper presents a control system implementation in dqz-coordinates for equalizing the average energies stored in each arm of a Modular Multilevel Converter (MMC); a control objective that is typically referred to as ... -
Analytical and FEM Calculation of Electrical Parameters of Carbon Steel Pipe in DEH Systems
(Chapter, 2018)In Direct Electrical Heating (DEH) systems, the pipeline of subsea oil productions conducts a large AC current to generate heat. To further improve the effectiveness of the DEH, higher operating frequency is preferable. ... -
Analytical design considerations for MVDC solid-state circuit breakers
(Chapter, 2019)This paper investigates the design principles of a solid-state circuit breaker (SS CB) for medium voltage direct current (MVDC) grids. The emphasis is given on the design of the required active and passive components that ... -
Analytical Loss Equations for Three Level Active Neutral Point Clamped Converters
(Chapter, 2020)This paper presents the analytical expressions that can be used to calculate conduction and switching losses in each devices of an Active Neutral Point Clamped Converter. These expressions can be used to determine the ... -
An Analytical Model for Detailed Transient Fault Analysis of Doubly-Fed Induction Machines
(Chapter, 2020)This paper presents an exact analytical solution to the two-phase and three-phase short-circuit events of the doubly-fed induction machine (DFIM). The contribution is intended to strengthen the predictability of DFIMs under ... -
Analytical-Based Iron Loss Assessment in the SPM Slotless Machine Stator Core
(Chapter, 2020)The use of slotless machines has acquired growing interest when features such as low vibrations and noise, along with low losses at high speed, are required. However, a careful assessment of the iron losses in the stator ... -
Ant colony optimization and analysis of time step resolution in transmission expansion computations for wind power integration
(Chapter, 2011)This paper investigates the necessary time step resolution in a transmission expansion planning algorithm based on ant colony optimization. A maximal and efficient wind power integration is the main motivation for the grid ... -
Arc Voltage Distribution Measurement in Tube Constricted Ultrahigh-Pressure Nitrogen Arc
(Chapter, 2020)This work contributes to the fundamental understanding of axial voltage distribution of the arc burning inside polytetrafluoroethylene (PTFE) tube at very high filling pressures of nitrogen. The arc peak current of 85 A ... -
Arm Voltage Estimation Method for Compensated Modulation of Modular Multilevel Converters
(Chapter, 2017)The Modular Multilevel Converter (MMC), being a complex system, requires a number of controllers to function properly. These range from low level switching pattern generation to high level control loops. Among these ... -
Assessing the potential benefit of energy storage in emission constrained power markets using equilibrium modeling
(Chapter, 2017)An equilibrium model of the energy market is extended by a carbon emissions market. In addition, the mix of renewable energy sources is optimized given a limit on total generation. These two new features are integrated ... -
Assessment of flexibility in different ancillary services for the power system
(Chapter; Peer reviewed, 2020)To handle the changing power system and enable the energy transformation, several actions are needed, where the increase of digitalization, automation and more substantial production variability implies a need for flexibility. ... -
Avoiding AC/DC grid interaction in MMC based MTDC Systems
(Chapter, 2017)In this paper, the interaction between ac and dc grids is studied for two types of MMC control structures; conventional and non-conventional control structures. Linear analysis methods that are based mode shapes and ... -
Balancing needs and measures in the future West Central European power system with large shares of wind and solar resources
(Chapter; Peer reviewed, 2017)The future European power system will include large shares of variable wind and solar resources. This paper analyses the variability for the eHighway 2050 scenarios (from the EU 7th Framework project) by modelling wind and ... -
Battery Degradation-Aware Congestion Management in Local Flexibility Markets
(Chapter, 2021)Recently, distribution system operators (DSO) are facing increasing congestion management challenges in their grids due to increasing electricity demand peaks. Batteries are widely assumed to be a promising technology to ... -
Breakdown strength of solid|solid interface
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Cable Selection Considerations for Subsea Vehicles
(Chapter, 2018)The aim of this paper is to present a methodology for selecting proper voltage level and power cables as a part of the AC distribution system design for subsea vehicles, such as Remotely Operated Vehicles, seafloor trenchers ... -
Centralized control of energy storages for voltage support in low-voltage distribution grids
(Chapter, 2016)This paper presents a centralized voltage control scheme for unbalanced low-voltage grids experiencing over voltage problems due to high PV power penetration. Voltage control is primarily achieved by remotely controlling ... -
Challenges and Strategies for a Real-Time Implementation of a Rainflow-Counting Algorithm for Fatigue Assessment of Power Modules
(Chapter, 2019)The aim of this work is to obtain a reliable estimation of the remaining lifetime of power-electronic modules. Lifetime models provide information on the fatigue durability of power modules under repetitive loading ... -
Challenges of SiC MOSFET Power Cycling Methodology
(Chapter, 2018)This paper investigates the power cycling methodology for reliability testing of SiC metal-oxide-semiconductor field-effect transistors (MOSFETs). Dedicated test benches were designed and built to study this issue. The ... -
Challenging Defects of High Voltage Insulation Systems
(Chapter, 2019)The primary function of a high voltage insulation system is to prevent the flow of electric current between oppositely charged conductors, facilitate heat transportation and provide mechanical support throughout a long ...