Essays about: "overvoltages"

Showing result 1 - 5 of 8 essays containing the word overvoltages.

  1. 1. Soft Energization and Blackout Recovery of Offshore Wind Farm Export System

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

    Author : Nicolas Mile; [2022]
    Keywords : STATCOM; ES-STATCOM; Blackout; Blackstart; Energization; Restoration; Offshore Wind; Power System; STATCOM; ES-STATCOM; Strömavbrott; Svartstart; Spänningssätta; Återställning; Havsbaserad Vindkraft; Energisystem;

    Abstract : Power generation of the future will be dominated by renewable energy sources. This is a positive trend as society aims to improve sustainability, energy security, and reduce CO2 emissions. This progress however bears challenges for the power systems of the future. READ MORE

  3. 2. Resonant overvoltages caused by transformer energization and saturation : Two EMT case studies conducted using models of the grid in Stockholm and an off-shore wind farm

    University essay from Uppsala universitet/Elektricitetslära

    Author : Gustav Sundberg; [2021]
    Keywords : Resonant overvoltages; Resonance frequency; Parallel resonance; EMT studies; Transformer saturation; Off-shore wind power; Inrush current; Sympathetic Inrush; Resonanta överspänningar; Resonansfrekvens; Parallellresonans; EMT-studier; Magnetiseringsström; Havsbaserad vindkraft;

    Abstract : This thesis investigates the impact of resonant overvoltages and their origin. Series and parallel resonances are present in any electrical grid. The frequency of which this resonance occurs is called resonance frequency. READ MORE

  4. 3. Eliminating zero-missing phenomenon in long, high voltage, underground cables

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

    Author : Agnes Linnet; [2019]
    Keywords : Underground cable; zero-missing phenomenon; switching transients; shunt reactors; underexcited generators; Underjordisk kabel; nollbristande fenomen; växlingstransienter; shuntreaktorer; underexiterad generatorer;

    Abstract : The maximum length of an high voltage underground cable (HV UGC) cable is oftenconstrained by the criterion that the cable cannot have more than 50% reactivepower compensation. If this limit is exceeded the current in the circuit breaker maynot have a zero crossing after energization, which is referred to as the zero missingphenomenon. READ MORE

  5. 4. Evaluation of critical fault scenarios for operation with inherent overload in HVDC stations

    University essay from Uppsala universitet/Elektricitetslära

    Author : Lisa Sander; [2018]
    Keywords : HVDC; Modular multilevel converter; VSC; transient currents; transient voltages; inherent overload; converter bus fault; pole to pole fault;

    Abstract : The HVDC, High Voltage Direct Current, is important when it comes to upgrading the energy system to a renewable, sustainable and efficient system. This master thesis is investigating what is happening during the most decisive fault cases when the HVDC station is operating with inherent overload. READ MORE

  6. 5. Definition of New Critical Distances for Transformers Re-energization during a Black Start

    University essay from KTH/Elektroteknisk teori och konstruktion

    Author : Valerian Bayle; [2017]
    Keywords : ;

    Abstract : This study aims to find new critical distances for transformer re-energization during network restoration after a blackout. Energizing a power transformer, in a grid that is lightly loaded due to the restoration process, involves a risk of temporary harmonic overvoltage. READ MORE