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Harmonic Disturbance Rejection with Applications to the Control of Offshore Cranes
(Doktoravhandlinger ved NTNU, 1503-8181; 2009:104, Doctoral thesis, 2009)The research proposed in this dissertation has been conducted from a theoretical as well as an applicative point of view. From a theoretical standpoint, the scope of the thesis falls within the field of the nonlinear output ... -
Harmonic State Space Modeling and Analysis of Modular Multilevel Converter
(Chapter, 2018)Modular multilevel converter (MMC) has complex internal dynamics, such as capacitor voltage fluctuations and harmonic circulating currents, which may have a big impact on the terminal behaviors of the MMC. Therefore, it ... -
Harmonic State-Space Based Small-Signal Impedance Modeling of a Modular Multilevel Converter With Consideration of Internal Harmonic Dynamics
(Journal article; Peer reviewed, 2019)The small-signal impedance modeling of a modular multilevel converter (MMC) is the key for analyzing resonance and stability of MMC-based power electronic systems. The MMC is a power converter with a multifrequency response ... -
Harmonic State-Space Based Small-Signal Impedance Modeling of Modular Multilevel Converter with Consideration of Internal Harmonic Dynamics
(Journal article; Peer reviewed, 2018)The small-signal impedance modeling of a modular multilevel converter (MMC) is the key for analyzing resonance and stability of MMC-based power electronic systems. The MMC is a power converter with a multifrequency response ... -
Harmonic Transfer-function-based Impedance Modelling of a Three-phase VSC for Asymmetric AC Grids Stability Analysis
(Journal article; Peer reviewed, 2019)Impedance modeling and stability analysis of a grid-VSC system under symmetric ac grids have been extensively discussed in the literature, where the dq domain impedances are usually adopted. As for asymmetric ac grids, ... -
Harmonic-Domain SISO Equivalent Impedance Modeling and Stability Analysis of a Single-Phase Grid-Connected VSC
(Peer reviewed; Journal article, 2020)This article presents a harmonic-domain single-input single-output (SISO) equivalent modeling technique for the impedance modeling and stability analysis of a single-phase grid-connected voltage-source converter (VSC). The ... -
Hazard analysis: Application of STPA to ship-to-ship transfer of LNG
(Journal article; Peer reviewed, 2019)The process industry has experienced technological advances, such as automatic handling of hazardous substances, process equipment, and valves. High levels of automation, as well as system interactions at component and ... -
Head-up display in driller and crane cabin
(Master thesis, 2010)This report describes the design and implementation of a prototype head-up display system, eventually to be installed in an NOV operator cabin. A head-up display is any transparent display being able to present information ... -
Heading estimation during motor-related magnetic disturbances
(Master thesis, 2023)Kursvinkelestimering er en utfordrende oppgave i nærvær av forstyrrelser fra magnetiske materialer. For små kjøretøy med elektriske motorer, som for eksempel en slangerobot, blir kursvinkelestimering ekstra utfordrende ... -
Heart rate and swimming activity as indicators of post-surgical recovery time of Atlantic salmon (Salmo salar)
(Peer reviewed; Journal article, 2021)Background Fish telemetry using electronic transmitter or data storage tags has become a common method for studying free-swimming fish both in the wild and in aquaculture. However, fish used in telemetry studies must be ... -
Heart rate and swimming activity as stress indicators for Atlantic salmon (Salmo salar)
(Peer reviewed; Journal article, 2020)We investigated the relationship between telemetry measurements of heart rate and swimming activity and the physiological status in farmed Atlantic salmon (Salmo salar) to assess the potential to use telemetry measurements ... -
Heave Compensated Tripping
(Master thesis, 2019)Olje- og gassindustrien blir møtt med store utfordringer når nye brønner skal bores fra flytende plattformer. En av disse utfordringene er trykkvariasjoner i brønnen forårsaket av bevegelse av boreutstyret. Siden havbølger ... -
Heave disturbance attenuation in managed pressure drilling from a floating platform using model predictive control
(Master thesis, 2014)Since a large part of the Norwegian oil shelf has been active for over a generation, many fields begin to be depleted and the drilling operations requires tight down hole pressure margins. And by improving the pressure ... -
Heave Motion Estimation on a Craft Using a Strapdown Inertial Measurement Unit
(Journal article; Peer reviewed, 2013)This paper deals with heave position and heave velocity estimation on a craft. The estimation is done without any knowledge of the specified craft. An accurate estimation of these signals is useful when one wants to control ... -
Heterogeneous multi-sensor tracking for an autonomous surface vehicle in a littoral environment
(Peer reviewed; Journal article, 2022)Sensor fusion plays a key part in autonomous surface vehicles, however, the high cost of sensors makes the barrier of entry in this research field quite high. In this work, we present a complete system for sensor fusion ... -
A heuristic observer design for an uncertain hyperbolic PDE using distributed sensing
(Peer reviewed; Journal article, 2021)We design an adaptive observer for semi-linear 2 × 2 hyperbolic PDEs with parametric uncertainties in both state equations. The proposed method is an extension of a previous result where parametric uncertainties were only ... -
Hierarchical Compliance-Control-Based Docking of a UVMS
(Journal article, 2023)The viability of underwater vehicle-manipulator systems (UVMS) in underwater intervention missions is heavily reliant on safety. For safe operations, a UVMS should specifically be able to both avoid dangers and interact ... -
Hierarchical Decentralized State Estimation With Unknown Correlation for Multiple and Partially Overlapping State Vectors
(Chapter, 2018)A fusion method for hierarchical decentralized state estimation is investigated with unknown cross-correlation. The process is divided into several local estimators for different subsystems that can operate independently ... -
Hierarchical nonlinear model predictive control of offshore hybrid power systems
(Peer reviewed; Journal article, 2022)This paper presents an approach for controlling ofshore hybrid power systems consisting of gas turbines, offshore wind, and batteries for satisfying an exogenous power demand. A hierarchical controller is developed comprising ...