Blar i Institutt for elkraftteknikk på tittel
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On the Scalability of Blockchain-Supported Local Energy Markets
(Chapter, 2018)Local energy markets could play a very important role in future electric power systems, allowing small electricity producers/consumers to trade within a small geographical area. In this context, an important challenge to ... -
On the Tangential AC Breakdown Strength of Polymer Interfaces Considering Elastic Modulus
(Chapter, 2017)The interfacial breakdown between two dielectric surfaces was reported to represent one of the leading causes of failure for power cable joints and connectors, in which elastic modulus of the dielectric material plays a ... -
On the Tuning of Fractional Order Resonant Controllers for a Voltage Source Converter in a Weak AC Grid Context
(Peer reviewed; Journal article, 2021)This paper proposes a method for tuning the fractional exponent of different types of fractional order resonant controllers for a voltage source converter in a weak AC grid context. The main objective is to ensure the ... -
On-line Condition Assessment of 420 kV Terminations - design and development of partial discharge sensors
(Master thesis, 2023)En kabelterminering er en nødvendig komponent når man går fra en kabel til et annet apparat i kraftsystemet. Det har derimot vist seg at kabeltermineringer er mer utsatt for feil enn kabelen i seg selv, mest fordi den ... -
On-line Condition Assessment of 420 kV Terminations - design and development of PD sensors
(Master thesis, 2022)Termineringer er ansett som et svakt punkt i transmisjonsnettet, og industrien erfarer at dårlig terminering er en av hovedgrunnene til feil i kabelsystemer. Partielle utladninger som en konsekvens av hulromsdannelse i ... -
On-line Magnetic Flux Monitoring and Incipient Fault Detection in Hydropower Generators
(Master thesis, 2019)Denne rapporten undersøker om kontinuerlig overvåkning av magnetfeltet i luftgapet kan bidra til å avdekke begynnende elektromagnetiske og mekaniske feil i vannkraftgeneratorer. Feiltypene som undersøkes i denne rapporten ... -
On-line Voltage Estimation during Sensorless Control of an Induction Machine Drive
(Master thesis, 2019)Sensorløs kontroll av elektriske maskiner kan bidra til økt pålitelighet samt kostnadsreduksjon på motordrifter med krav til høy-presisjon. Kontrollstrategien feltorientert kontroll kan brukes for å oppnå sensorløs kontroll ... -
On-Line Voltage Stability Assessment - Combining Model Based and Measurement Based Indicators .
(Master thesis, 2017)This master thesis has examined the possibility of combining measurement and model based methods for on-line voltage stability assessment in the power system. Voltage instability may lead to voltage collapse and blackout ... -
Online Assessment of Contact Erosion in High Voltage Gas Circuit Breakers based on different Physical Quantities
(Journal article; Peer reviewed, 2018)In this paper, an effort has been made to evaluate the online condition of arc contacts as a vital component of interruption chamber in high voltage puffer type SF6 circuit breakers. The relationship between eroded mass ... -
Online Assessment of Contact Erosion in High Voltage Gas Circuit Breakers based on different Physical Quantities
(Journal article; Peer reviewed, 2018)In this paper, an effort has been made to evaluate the online condition of arc contacts as a vital component of interruption chamber in high voltage puffer type SF6 circuit breakers. The relationship between eroded mass ... -
Online condition monitoring of synchronous generator using shaft signals
(Master thesis, 2021)Nesten 100% av Norges elektrisitet produseres med vannkraft. Vannkraftprodusentene i Norge bruker i hovedsak generatorer av typen synkrongenerator med utpregede poler (SGUP). En sikker drift av disse generatorene er viktig ... -
Online Condition Monitoring of Synchronous Generators using Vibration Signal
(Master thesis, 2020)Vannkraft er blant de reneste energikildene og stod for 95% og 16% av den totale energiproduksjonen i henholdsvis Norge og verden i 2018. Synkrongeneratoren med utpregende poler er den enerådende maskinen brukt for ... -
Online Identification of Six-Phase IPMSM Parameters Using Prediction-Error Sensitivities to Model Parameters
(Chapter, 2022)Six-phase Interior Permanent Magnet Synchronous Machines (IPMSM) drives with dual three-phase configuration offer unique merits that make them attractive for reliability-critical applications. Online identification of ... -
Online non‐invasive evaluation of arcing time for condition assessment of high‐voltage gas circuit breakers
(Peer reviewed; Journal article, 2021)Online non‐invasive methods to assess circuit breaker condition have been under consideration in recent years. The combination of the arcing time and the short‐circuit current recorded by protective relays can be utilized ... -
Online Parameter Adjustment Method for Arm Voltage Estimation of the Modular Multilevel Converter
(Journal article; Peer reviewed, 2019)The method used to calculate insertion indexes plays an important role in determining the overall performance of the Modular Multilevel Converter (MMC). Direct voltage control, which is the simplest option, results in a ... -
Online parameter identification of synchronous machines using Kalman filter and recursive least squares
(Chapter, 2019)This paper investigates and implements a procedure for parameter identification of salient pole synchronous machines that is based on previous knowledge about the equipment and can be used for condition monitoring, online ... -
Online Voltage Stability Monitoring and Coordinated Secondary Voltage Control
(Doctoral thesis at NTNU;2016:242, Doctoral thesis, 2016)The development towards increasing use of renewable energy sources and smart grid applications represent a paradigm shift in power system operation. Due to the large share of variable generation and more dynamic load ... -
Online Voltage Stability Monitoring in Distribution Networks
(Master thesis, 2017)Power systems are often operated close to their stability limit. Line contingencies or other disturbances can cause the system to lose stability. If the power system loses stability counteractions have to be taken or else ... -
Onset of Convection in Two-Dimensional Porous Cavities with Open and Conducting Boundaries
(Journal article; Peer reviewed, 2021)The onset of thermal convection in two-dimensional porous cavities heated from below is studied theoretically. An open (constant-pressure) boundary is assumed, with zero perturbation temperature (thermally conducting). The ... -
Open Conductor Faults and Dynamic Analysis of a Power System
(Master thesis, 2012)The overall goal of this thesis is to study and understand Open Conductor Faults and to assess their impact on the stability of a power system. In particular, the thesis has investigated the effect of this type of the fault ...