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Transientanalyse av 22 kV feil i nett med transformatorer uten HS- sikringer
(Bachelor thesis, 2023)Distribusjonstransformatoren er en viktig komponent i kraftnettet. Skader og havari på den medfører store kostnader med tanke på utstyr, utrykning og nedetid for kunder. Røros E-verk har hatt problemer med transformatorhavari ... -
Transients During Energization of Unloaded Generator Step-Up Transformers
(Master thesis, 2019)En standard vannkraftstasjon i det norske kraftsystemet består av generator og transformator installert i fjellanlegg. Fra transformatoren går det kabler til et utendørs koblingsanlegg med effektbryter, samleskinne og ... -
Transition Strategies for Smart Grid: Evaluating future scenarios on a distribution grid
(Master thesis, 2022)Med en økende mengde energiproduksjon og -forbruk i distribusjonsnettet, møter distribusjonssystemoperatører utfordringer knyttet til både planlegging og drift av nettet. Høyere lasttopper og nettverkselementer med ... -
Transmission Expansion Planning in the Nordic System for Wind Power Integration based on Ant Colony Optimization
(Research report, 2011)This paper presents a transmission expansion algorithm based on ant colony optimization. It was developed and tested on a model for the Nordic area. The main focus of this work was to build a transmission expansion planning ... -
Transmission investments under uncertainty: Assessment of how different European energy scenarios for 2030 influence the North Sea Offshore Grid
(Master thesis, 2019)Nordsjønettet er ansett som et viktig prosjekt for å inkludere mer fornybar kraftproduksjon og øke integrasjon av kraftmarkeder. Nordsjøområdene har et stort potensial for offshore vindkraftproduksjon på grunn av de gunstige ... -
Transmission line unavailability due to correlated threat exposure
(Chapter, 2019)Blackouts in the power system are rare events that can have large consequences for society. Successful preparation and prevention of such events calls for models capable of predicting their occurrence. The simultaneous ... -
Transmission Loss Minimization Using Artificial Intelligent Algorithm for Nordic44 Network Model based on Hourly Load Variation
(Peer reviewed; Journal article, 2020)Optimal power flow is a nonlinear optimization method to enhance the performance and flexibility of a power system. This paper explores the use of particle swarm optimization (PSO) algorithm as an artificial intelligence ... -
Transmission solutions for connecting offshore power plants to the onshore grid
(Master thesis, 2009)The European Union has set a binding target saying 20 per cent of their energy consumption shall come from renewable energy sources within 2020. Around 4 per cent of the total amount is planned to come from offshore ... -
Traveling Wave Fault Location on HVDC-MMC Transmission Lines
(Master thesis, 2023)Med et økende behov for elektrisk energi, har høyspentsystemer med likestrøm (HVDC) blitt mer populært. Disse systemene har flere fordeler sammenlignet med høyspentsystemer basert på vekselstrøm (HVAC), blant annet ved at ... -
Tree High Impedance Fault Modelling
(Master thesis, 2023)Europe will be subject in the coming years to major changes in the energy sector, according to the plan called “REPowerEu” the goal is to reduce greenhouse gas emissions by 55% by 2030 and achieve climate neutrality by ... -
Trends and Constraints on Brazilian Photovoltaic Industry: Energy Policies, Interconnection Codes, and Equipment Certification
(Journal article; Peer reviewed, 2018)After years of dormant scenarios, the Brazilian industry of photovoltaic (PV) energy systems is now growing fast. Therefore, improving interconnection and certification codes, as well as standards, has become undeniably ... -
TSO - DSO Coordination for Voltage Control: Simulaiton Study and Use Case Development
(Master thesis, 2020)Abstract With the increasing share of DG and RES, the changing framework in the energy market, the number of traditional synchronous generators decreases, hence primary sources for voltage control are missing. Furthermore, ... -
Tuning of Control Loops for Grid-Connected Modular Multilevel Converters under a Simplified Port Representation for Large System Studies
(Chapter, 2017)One of the present barriers to the widespread use of Modular Multilevel Converters (MMC) is the complexity of its control with respect to its predecessors. This paper presents a simple procedure to tune the current and ... -
Turbulent Incompressible Wake Flow in a Rectangular Channel: High speed PIV experiment and LES simulation
(Master thesis, 2011)Turbulence is a ubiquitous phenomenon of highly complex flow. With increasing computer capacity and steadily improving numerical methods Computational Fluid Dynamics (CFD) is becoming a beneficial tool in the study of ... -
Two novel current-based methods for locating earth faults in unearthed ring operating MV networks
(Journal article; Peer reviewed, 2022) -
A two-level over-voltage control strategy in distribution networks with high PV penetration
(Peer reviewed; Journal article, 2021)Over-voltage in low voltage feeders due to the increasing penetration level of photovoltaic (PV) is a crucial issue to be addressed. There is a need to use more advanced voltage control methods to satisfy the response time ... -
Two-way Interaction between Switching Arc and Solid Surfaces: Distribution of Ablated contact and Nozzle Materials
(Journal article; Peer reviewed, 2019)This paper is devoted to two-way plasma-surface interactions by investigating how the plasma arc ablates the nozzle and contacts and how the distribution of ablated materials changes the plasma parameters. For this ... -
Ukontrollerte pendlinger i polhjulsvinkel på generatorer i regionalnettet
(Master thesis, 2010)I denne rapporten er synkrongeneratorens dynamiske oppførsel studert ved direkte faseavbrudd på tre-fase overføringslinjer i regionalnettet, via datamaskinbasert modellering og simulering. Ved feil studeres virkningen av ... -
Ultrahigh-Pressure Nitrogen Arcs Burning Inside Cylindrical Tubes
(Journal article; Peer reviewed, 2018)When the pressure and temperature of a fluid exceed a critical point, the fluid enters into the supercritical (SC) region. In this region, the physical properties are believed to be in favor of a good current interruption ... -
Unbalanced Load Compensation by PowerBased Control in the Synchronous Reference Frame
(Chapter, 2019)Power-based control has proven to be an effective and robust way for having a centralized control scheme in a microgrid. The scheme has a minimal communication requirement, which enables the distributed energy resources ...