Blar i NTNU Open på forfatter "Føyen, Sjur"
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A signal analysis toolbox for power system identification in Smart Grids
Kvammen, Mads-Emil Bratland; Føyen, Sjur (Master thesis, 2018)This thesis delves into the two fields of signal analysis and small-signal stability of power systems. Due to the extensive deployment of PMUs in today s Smart Grid, new possibilities arise to assess the small-signal ... -
Frequency Domain Modelling for Assessment of Hilbert and SOGI Based Single-Phase Synchronisation
Føyen, Sjur; Fosso, Olav B; Zhang, Chen; Molinas Cabrera, Maria Marta (Chapter, 2019)Two different single-phase synchronisation schemes based on orthogonal system generation (OSG) are modelled in the linear, time-periodic framework. The frequency adaptive Hilbert phase locked loop (PLL) and the frequency-fixed ... -
Harmonic-Domain SISO Equivalent Impedance Modeling and Stability Analysis of a Single-Phase Grid-Connected VSC
Zhang, Chen; Molinas Cabrera, Maria Marta; Føyen, Sjur; Suul, Jon Are Wold; Isobe, Takanori (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 ... -
Impedance scanning with chirps for single-phase converters
Føyen, Sjur; Zhang, Chen; Molinas Cabrera, Maria Marta; Fosso, Olav B; Isobe, Takanori (Chapter, 2022)Impedance scanning of single-phase AC-DC converters is challenging due to frequency couplings, which map one injection frequency to a multiple of output frequencies. Single-tone injections are often preferred over wideband ... -
Instability Mode Recognition of Grid-Tied Voltage Source Converters with Nonstationary Signal Analysis
Zhang, Yu; Føyen, Sjur; Zhang, Chen; Molinas Cabrera, Maria Marta; Fosso, Olav B; Cai, Xu (Chapter, 2022)With the increasing penetration of voltage-source-converter (VSC) -interfaced distributed generations (DGs) in power systems, oscillation issues have been widely concerned whereas the root cause and nature of the oscillation ... -
An Integrated Method for Generating VSCs’ Periodical Steady-state Conditions and HSS-based Impedance Model
Molinas Cabrera, Maria Marta; Zhang, Chen; Føyen, Sjur; Suul, Jon Are; Takanori, Isobe (Peer reviewed; Journal article, 2020)This paper proposes an integrated method for generating the voltage-source-converters’ (VSCs’) periodical steady-state (PSS) conditions and the harmonic-state-space (HSS)-based impedance model. Since these two objectives ... -
Modeling and Analysis of SOGI-PLL/FLL-based Synchronization Units: Stability Impacts of Different Frequency-feedback Paths
Zhang, Chen; Føyen, Sjur; Suul, Jon Are Wold; Molinas, Marta Maria Cabrera (Peer reviewed; Journal article, 2020)— Second-order Generalized Integrator (SOGI)-based quadrature-signal-generator (QSG) together with either a phaselocked-loop (PLL) or a frequency-locked-loop (FLL) constitute two types of typical synchronization units ... -
Modelling of frequency-coupled power electronics systems: Automated model generation and chirp frequency scanning, applied to single-phase VSCs
Føyen, Sjur (Doctoral theses at NTNU;2024:138, Doctoral thesis, 2024)Power electronics converters play a major role as interface to the AC grid as we transition towards an electric and renewable society. The converters are controlled, modelled and generally understood in time-periodic ... -
Prony's method as a tool for power system identification in Smart Grids
Føyen, Sjur; Kvammen, Mads-Emil B.; Fosso, Olav B (Chapter, 2018)Abstract —This paper investigates the theory, intuition and performance of two known implementations of Prony’s method. Such methods are useful for identifying the individual modes of a system without constructing a ...