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Thyristor based short circuit current injection in isolated grids
(Peer reviewed; Bokkapittel; Chapter, 2017-02-16)
This paper proposes a thyristor based short circuit current injector for providing short circuit current in isolated and weak grids, where sufficient fault current to trigger circuit breakers may not be available. This will allow the use of conventional miniature circuit breakers, which requires high fault current for instantaneous tripping. The method has been validated through experiments.
Når blir skipsfarten grønn?
(Kronikk; Chronicle, 2018-04-25)
n av utfordringene i forbindelse med dagens skipsfart er utslipp til luft, hovedsakelig karbondioksid og nitrogenoksider. Disse utslippene er knyttet til oljefyrte forbrenningsmotorer som dominerer dagens skipsflåte. Det er overveiende sannsynlig at det er en direkte sammenheng mellom global oppvarming og utslipp av klimagasser. Utslipp til luft kan også bidra til sur nedbør og svevestøv, for å nevne ...
Framework for Modeling and Simulation of Household Appliances
(Peer reviewed; Book; Chapter, 2018-12-31)
This paper describes a framework for simulating household appliances in Simulink. Typical Norwegian household equipment have been analyzed based on their characteristic behavior, to establish the requirement for synthesizing and recreating their current waveform, harmonic currents and phase shift. Both detailed simulation of the current waveform and RMS currents for simulation over longer time periods ...
Maximum Available Power of Undersea Capacitive Coupling in a Wireless Power Transfer System
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-06-23)
This paper studies the maximum available power of a dissipative capacitive power transfer (CPT) system submerged in seawater. The CPT system's maximum power capability is driven using the network theory, precisely the conjugate-image approach. The equations of the maximum available load power and the system's corresponding efficiency are expressed as a function of the capacitive coupling parameters. ...
Framework for Modeling and Simulation of Household Appliances
(Peer reviewed; Chapter, 2018-12-31)
This paper describes a framework for simulating household appliances in Simulink. Typical Norwegian household equipment have been analyzed based on their characteristic behavior, to establish the requirement for synthesizing and recreating their current waveform, harmonic currents and phase shift. Both detailed simulation of the current waveform and RMS currents for simulation over longer time periods ...
A Review of Power Converters for Ships Electrification
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-12-07)
Fully electric ships have become popular to meet the demand for emission-free transportation and improve ships' functionality, reliability, and efficiency. Previous studies reviewed the shipboard power systems, the different types of shipboard energy storage devices, and the influences of the shore-to-ship connection on ports' electrical grid. However, the converter topologies used in the electrification ...
Conformal Transformation Analysis of Capacitive Wireless Charging
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-09-30)
This paper studies the capacitive coupling in a capacitive power transfer (CPT) system
designed for charging applications. It proposes mathematical models using the conformal transformation
for calculating air-gapped and underwater capacitance and verifies the proposed models using COMSOL
multiphysics and measurements. The measured results show that we can achieve nano-farad capacitance
ranges ...
Optimal Solutions for Underwater Capacitive Power Transfer
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-12-09)
Capacitive power transfer (CPT) has attracted attention for on-road electric vehicles, autonomous underwater vehicles, and electric ships charging applications. High power transfer capability and high efficiency are the main requirements of a CPT system. This paper proposes three possible solutions to achieve maximum efficiency, maximum power, or conjugate-matching. Each solution expresses the ...
Deep Adaptive Ensemble Filter for Non-Intrusive Residential Load Monitoring
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-02-10)
Identifying flexible loads, such as a heat pump, has an essential role in a home energy management system. In this study, an adaptive ensemble filtering framework integrated with long short-term memory (LSTM) is proposed for identifying flexible loads. The proposed framework, called AEFLSTM, takes advantage of filtering techniques and the representational power of LSTM for load disaggregation by ...
Load modeling from smart meter data using neural network methods
(Chapter; Bokkapittel, 2021)
Electricity load modeling plays a critical role to conduct load forecasting or other applications such as non-intrusive load monitoring. For such a reason, this paper investigates a comparison study of two common artificial neural network methods (Multilayer perceptron (MLP) and radial basis function neural network (RBF-NN) for home load modeling application. The accuracy of load modeling using ...