Essays about: "HVDC"

Showing result 1 - 5 of 108 essays containing the word HVDC.

1. 1. Humidity dependent conductivity of air in HVDC applications and the role of surfaces

   University essay from Uppsala universitet/Fasta tillståndets fysik

   Author : Erik Svensson; [2023]
   Keywords : HVDC; humidity; air conductivity; thin films; HVDC; luftfuktighet; luftkonduktivitet; tunna filmer;

   Abstract : High Voltage Direct Current (HVDC) bushings are insulated devices designed to facilitate the safe passage of electric current across an earthed barrier. Understanding air conductivity is of utmost importance in the design of HVDC components, which is determined by ion density and ion mobility. READ MORE

3. 2. Stray capacitance study for HVDC Classic : The use of PSCAD and Mathcad to calculate the equivalent stray capacitance

   University essay from Uppsala universitet/Elektricitetslära

   Author : Saga Dalersand; Fredrik Gjöthlén; [2023]
   Keywords : ;

   Abstract : The reactors placed in the thyristor valve designed by Hitachi Energy have reactor losses which are dependent on the stray capacitance. To find out the stray capacitance, and further get to know the reactor losses, a PSCAD simulation is performed. READ MORE

4. 3. Control Aid Implementation -Modelling and simulation of triple extruder-

   University essay from Lunds universitet/Kemiteknik (CI)

   Author : Karl Langsér; [2023]
   Keywords : Machine Learning; Extruder; Modelling; Simulation; Extreme learning machine; Chemical engineering; Technology and Engineering;

   Abstract : In the production of their High Voltage Direct Current Cables (HVDC) and High Voltage Alternating Current Cables (HVAC), NKT uses triple extruders to create layers of insulation and semi-conduction. A model to predict the effect of extruder inputs on the cable’s insulation and semi-conducting layers has been created and trained to predict the extruder in discrete time. READ MORE

5. 4. Investigation of charge injection at electrode-dielectric interface relevant for HVDC cables : Simulation of charge injection and transport dynamics in electrical insulation for HVDC cables

   University essay from Uppsala universitet/Tillämpad mekanik

   Author : Mohammed Mosa; [2023]
   Keywords : BCT model; charge injection; space charge density; electric field distribution; Fowler-Nordheim; Richardson-Schottky;

   Abstract : A bipolar charge transport (BCT) model is used to simulate charge injection and transportdynamics inside insulation material which are used in a high voltage direct current (HVDC)cable. Gaining knowledge about space charge density and electric field distribution in theinsulation material enables minimising charge injection at the metal-insulator interface andavoiding unnecessary energy loss. READ MORE

6. 5. Evaluation of key performance indices for frequency quality : A method for evaluating frequency stability in the Nordic power system

   University essay from KTH/Skolan för elektroteknik och datavetenskap (EECS)

   Author : Sophia Larbi Engelbrektsson; [2023]
   Keywords : Ancillary Services; Kinetic Energy; Frequency Dependent Load; Frequency Stability; Frequency Quality; KPI; Nordic Power System; Frekvensberoende Last; Frekvenskvalité; Frekvensstabilitet; Kinetisk Energi; Nordiska Elsystemet; Nyckeltal; Stödtjänster;

   Abstract : The Nordic power system is in a changing phase, with more power electronic interfaced connections, and HVDC connections to other synchronous areas, which impacts the frequency quality. This is a challenge for the transmission system operator of Sweden, Svenska Kraftnät, who, with the other Nordic transmission system operators, is responsible for the physical balancing of the Nordic power system. READ MORE