Browsing NTNU Open by Author "Rygg, Atle"
Now showing items 1-17 of 17
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A Modified Sequence-Domain Impedance Definition and Its Equivalence to the dq-Domain Impedance Definition for the Stability Analysis of AC Power Electronic Systems
Rygg, Atle; Molinas Cabrera, Maria Marta; Cai, Xu; Chen, Zhang (Peer reviewed; Journal article, 2016)Representation of ac power systems by frequency-dependent impedance equivalents is an emerging technique in the dynamic analysis of power systems including power electronic converters. The technique has been applied for ... -
Apparent impedance analysis: A new method for power system stability analysis
Rygg, Atle; Amin, Mohammad; Molinas Cabrera, Maria Marta; Gustavsen, Bjørn Alfred (Conference object; Peer reviewed, 2016)In this paper a new method for power system stability analysis is introduced. The method is based on injection of a small voltage or current in an arbitrary point of the system. The apparent impedance is defined as the ... -
Apparent impedance analysis: A small-signal method for stability analysis of power electronic based systems
Rygg, Atle; Molinas Cabrera, Maria Marta (Journal article, 2017)In this paper a new method for power system stability analysis is introduced. The method is based on injection of a small voltage or current in an arbitrary point of a power system. The apparent impedance is then defined ... -
Frequency Domain Modelling and Stability Analysis of a DFIG-based Wind Energy Conversion System Under None-compensated AC Grids: Impedance Modelling Effects and Consequences on Stability
Zhang, Chen; Molinas Cabrera, Maria Marta; Rygg, Atle; Cai, Xu (Journal article; Peer reviewed, 2019)Impedance-based frequency domain method is an effective tool for the stability assessment of a doubly-fed induction generator (DFIG) system. Several impedance models have been proposed recently, however, these models are ... -
Frequency-dependent source and load impedances in power systems based on power electronic converters
Rygg, Atle; Molinas Cabrera, Maria Marta; Cai, Xu; Chen, Zhang (Conference object; Peer reviewed, 2016)Representations of power systems by frequency dependent impedance equivalents is an emerging technique in dynamic analyses of power systems including power electronic converters. The technique has been applied for decades ... -
Handling system harmonic propagation in a diesel-electric ship with an active filter
Rygg, Atle; Skjong, Espen; Molinas Cabrera, Maria Marta (Conference object; 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 ... -
Harmonic Transfer-function-based Impedance Modelling of a Three-phase VSC for Asymmetric AC Grids Stability Analysis
Zhang, Chen; Molinas Cabrera, Maria Marta; Rygg, Atle; Lyu, Jing; Cai, Xu (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, ... -
Impedance-based Analysis of Interconnected Power Electronics Systems: Impedance Network Modeling and Comparative Studies of Stability Criteria
Zhang, Chen; Molinas Cabrera, Maria Marta; Rygg, Atle; Cai, Xu (Journal article; Peer reviewed, 2019)Impedance is an intuitive and effective way for dynamical representation of power electronics devices (e.g. VSCs). One of its strengths towards others is the natural association with circuits. However, impedances of VSCs ... -
Impedance-based Methods for Small-signal Analysis of Power Electronics Dominated Systems
Rygg, Atle (Doctoral theses at NTNU;2018:292, Doctoral thesis, 2018)Kraftsystemet er i endring - vi manglar metodar for å analysere det! Kraftnettet har tradisjonelt hatt ein struktur med store produksjonseiningar tilkopla høgspentnettet, og rollen til nettet har vore å føre denne ... -
Impedance-Based Stability Evaluation of Virtual Synchronous Machine Implementations in Converter Controllers
Unamuno, Eneko; Rygg, Atle; Amin, Mohammad; Molinas Cabrera, Maria Marta; Barrena, Jon Andoni (Chapter, 2018)This paper presents a stability evaluation of two Virtual Synchronous Machine (VSM) implementations in the control of Voltage Source Converters (VSCs): a current-controlled (CCVSM) and a voltage-controlled (VCVSM) version ... -
Modeling and analysis of grid-synchronizing stability of a Type-IV wind turbine under grid faults
Zhang, Chen; Cai, Xu; Rygg, Atle; Molinas Cabrera, Maria Marta (Peer reviewed; Journal article, 2020)Transient behavior and response of wind turbines have been extensively studied in the context of the low-voltage-ride-through (LVRT) for many years, in which the identified transients are mostly associated with circuit ... -
On the Equivalence and Impact on Stability of Impedance Modeling of Power Electronic Converters in Different Domains
Rygg, Atle; Molinas Cabrera, Maria Marta; Chen, Zhang; Cai, Xu (Journal article, 2017)Small-signal analysis of power electronic converters and systems is often carried out by impedance-based methods. At the core of these methods lies the impedance modeling, which can either be obtained through analytical ... -
On the Impedance Modeling and Equivalence of AC/DC Side Stability Analysis of a Grid-tied Type-IV Wind Turbine System
Zhang, Chen; Molinas Cabrera, Maria Marta; Rygg, Atle; Cai, Xu (Journal article; Peer reviewed, 2018)Impedance modeling of a Type-IV wind turbine is usually associated with model reductions, e.g. the grid-side converter (GSC) is modeled in detail, whereas the machine-side converter (MSC) is simplified as a constant power ... -
Properties and Physical Interpretation of the Dynamic Interactions between Voltage Source Converters and Grid: Electrical Oscillation and Its Stability Control
Zhang, Chen; Molinas Cabrera, Maria Marta; Rygg, Atle; Li, Zheng; Cai, Xu (Journal article; Peer reviewed, 2017)Voltage source converters (VSCs) play an important role in the power conversion of renewable power generation (RPG) systems. Conventional power systems are considerably affected by power electronic devices in systems with ... -
Real-time stability analysis of power electronic systems
Rygg, Atle; Molinas Cabrera, Maria Marta (Conference object; Peer reviewed, 2016)The paper presents a new method for performing online stability analysis of power electronic systems. The method is based on impedance analysis, where the only information required are measurements taken at a single point. ... -
Sequence Domain SISO Equivalent Models of a Grid-tied Voltage Source Converter System for Small-Signal Stability Analysis
Zhang, Chen; Molinas Cabrera, Maria Marta; Rygg, Atle; Cai, Xu (Journal article; Peer reviewed, 2017)This paper presents a generalized method for converting multi-input and multi-output (MIMO) dq impedance model of a grid-tied voltage source converter system into its sequence domain single-input and single-output (SISO) ... -
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 ...