Browsing NTNU Open by Author "Skjong, Espen"
Now showing items 1-18 of 18
-
Approaches to Economic Energy Management in Diesel-Electric Marine Vessels
Skjong, Espen; Johansen, Tor Arne; Molinas Cabrera, Maria Marta; Sørensen, Asgeir Johan (Journal article; Peer reviewed, 2017)Recently, the efficiency of diesel-electric marine vessels has been subject for discussion with focus on improving fuel efficiency, reducing the environmental footprint from emissions, as well as reducing running hours and ... -
Autonomous search and tracking of objects using model predictive control of unmanned aerial vehicle and gimbal: Hardware-in-the-loop simulation of payload and avionics
Skjong, Espen; Nundal, Stian Aa.; Leira, Frederik Stendahl; Johansen, Tor Arne (Chapter, 2015)This paper describes the design of model predictive control (MPC) for an unmanned aerial vehicle (UAV) used to track objects of interest identified by a real-time camera vision (CV) module in a search and track (SAT) ... -
Distributed control architecture for real-time model predictive control for system-level harmonic mitigation in power systems
Skjong, Espen; Johansen, Tor Arne; Molinas Cabrera, Maria Marta (Journal article; Peer reviewed, 2019)It can be challenging to design and implement Model Predictive Control (MPC) schemes in systems with fast dynamics. As MPCs often introduce high computational loads, it can be hard to assure real-time properties required ... -
Extremum-Seeking Control for Harmonic Mitigation in Electrical Grids of Marine Vessels
Haring, Mark; Skjong, Espen; Johansen, Tor Arne; Molinas, Marta (Journal article; Peer reviewed, 2019)This paper focuses on the minimization of the harmonic distortion in multibus electrical grids of marine vessels using a single active power filter. An active power filter is commonly used for local harmonic mitigation. ... -
Handling system harmonic propagation in a diesel-electric ship with an active filter
Rygg, Atle; Skjong, Espen; Molinas Cabrera, Maria Marta (Journal article; Peer reviewed, 2015)Harmonic distortion is often a challenge in marine vessel power systems due to the presence of large motor drives containing diode or thyristor rectifiers. Governing standards impose requirements on bus voltage Total ... -
Instantaneous frequency tracking of harmonic distortions for grid impedance identification based on Kalman filtering
Broen, Anders Kjeka; Amin, Mohammad; Skjong, Espen; Molinas Cabrera, Maria Marta (Chapter, 2016)This paper presents a non-invasive approach for real-time grid impedance identification based on the principle of instantaneous frequency tracking of voltage and current harmonics already present in the system, by the use ... -
Management of harmonic propagation in a marine vessel by use of optimization
Skjong, Espen; Ochoa-Gimenez, Miguel; Molinas Cabrera, Maria Marta; Johansen, Tor Arne (Chapter, 2015)Advances in power electronics drive systems for variable speed operation has enabled extensive use of such solutions in the propulsion and thruster systems of marine vessels. These solutions however introduce current and ... -
Optimal Compensation of Harmonic Propagation in a Multi-Bus Microgrid
Skjong, Espen; Suul, Jon Are Wold; Molinas Cabrera, Maria Marta; Johansen, Tor Arne (Journal article; Peer reviewed, 2016-05)This paper discusses how an Active Power Filter (APF) can be utilized for system-wide harmonic mitigation in a microgrid with multiple sources of harmonic distortion located at different buses. A two-bus microgrid system ... -
An Optimal Energy Management System for Marine Hybrid Power Systems
Park, Daeseong; Perabo, Florian; Choi, Minjoo; Skjong, Espen; Zadeh, Mehdi (Chapter, 2021)This paper proposes an optimal control strategy for the energy management system (EMS) of marine hybrid power systems with the objective of reducing operational expenses (OPEX) and environmental emissions. Here, the OPEX ... -
Optimization-based Control in Shipboard Electric Systems
Skjong, Espen (Doctoral theses at NTNU;2017:139, Doctoral thesis, 2017)With stringent, and globally sanctioned, environmental rules and regulations, dictating limits for allowed emissions of greenhouse gases and particle matter from combustion of fossil fuels, the marine vessel’s efficiency ... -
Optimized current reference generation for system-level harmonic mitigation in a diesel-electric ship using non-linear model predictive control
Skjong, Espen; Molinas Cabrera, Maria Marta; Johansen, Tor Arne (IEEE International Conference on Industrial Technology (ICIT) 2015;, Chapter, 2015)Non-linear optimal control using collocation and multiple shooting is investigated in this paper to generate the current reference signal for the lower level control of an active filter in a marine vessel with diesel-electric ... -
Past, Present and Future Challenges of the Marine Vessel's Electrical Power System
Skjong, Espen; Volden, Rune; Rødskar, Egil; Molinas Cabrera, Maria Marta; Johansen, Tor Arne; Cunningham, Joseph (Journal article, 2016)The evolution of the use of electricity in marine vessels is presented and discussed in this article in an historical perspective. The historical account starts with its first commercial use in the form of light bulbs on ... -
Shaping the current waveform of an active filter for optimized system level harmonic conditioning
Skjong, Espen; Molinas Cabrera, Maria Marta; Johansen, Tor Arne; Volden, Rune (Proceedings of the 1st International Conference on Vehicle Technology and Intelligent Transport Systems;VEHITS 2015, Chapter, 2015)Harmonic voltages and currents in electrical systems, when present to a certain degree, represent not only a power quality problem but they are also strongly associated with the electrical system overall losses and they are ... -
System-Wide Harmonic Mitigation in a Diesel Electric Ship by Model Predictive Control
Skjong, Espen; Suul, Jon Are Wold; Rygg, Atle; Johansen, Tor Arne; Molinas Cabrera, Maria Marta (Journal article; Peer reviewed, 2016)Email Print Request Permissions This paper proposes a system-oriented approach for mitigating harmonic distortions by utilizing a single Active Power Filter (APF) in an electrical grid with multiple buses. Common practice ... -
The Marine Vessel’s Electrical Power System: From its Birth to Present Day
Skjong, Espen; Rødskar, Egil; Molinas Cabrera, Maria Marta; Johansen, Tor Arne; Cunningham, Joseph (Journal article; Peer reviewed, 2015)Examines the development of marine vehicle power systems from an historical perspective. from the earliest forms of power systems to the current development of all electric ship technologies. -
Three-Axis Motion Compensated Crane Head Control
Henriksen, Vegard Wie; Røine, Audun Gerhardsen (Master thesis, 2016)Offshore operations can be harsh and demanding and set personnel and equipment at risk. Ships will be exposed to the environmental forces of wind, waves and current, which will influence offshore crane operations considerably. ... -
Three-axis Motion Compensated Crane Head Control
Henriksen, Vegard Wie; Røine, Audun Gerhardsen; Skjong, Espen; Johansen, Tor Arne (Journal article; Peer reviewed, 2016)Offshore operations can be harsh and demanding and set personnel and equipment at risk. Ships will be exposed to the elemental forces of wind, waves and current, which will influence offshore crane operations considerably. ... -
Tracking objects with fixed-wing UAV using model predictive control and machine vision
Skjong, Espen; Nundal, Stian Aas (Master thesis, 2014)This thesis describes the development of an object tracking system for unmanned aerial vehicles (UAVs), intended to be used for search and rescue (SAR) missions. The UAV is equipped with a two-axis gimbal system, which ...