Essays about: "impedance analysis"

Showing result 16 - 20 of 93 essays containing the words impedance analysis.

  1. 16. Investigating Particle Cracking in Single- and Polycrystalline Nickel-Rich Cathodes using In Situ Impedance Spectroscopy

    University essay from Uppsala universitet/Strukturkemi

    Author : Mattias Sjödin; [2021]
    Keywords : Electrochemical surface area; particle cracking; NMC811; transmission-line model; equivalent-circuit fitting; commercial Li-ion batteries;

    Abstract : State-of-the-art Li-ion cathode materials are based on LiMO2 (M=Ni, Mn, Co) layered transition metal oxides (denoted NMC) with Ni-rich composition because of their high specific capacity. Yet, these materials suffer from poor capacity retention due to crack formation during de-/lithiation cycling. READ MORE

  3. 17. Large Scale Analysis of Massive Deployment of Converter-based Generation equipped with Grid- forming Strategies

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

    Author : Cristhian Carim Jimenez Saldana; [2020]
    Keywords : Grid-Forming; Converter-Based Generation; Voltage Source Converter VSC ; Current Limitation; Threshold-Virtual Impedance TVI ;

    Abstract : To mitigate the carbon footprint and the need to fulfil the energy goals in terms of sustainability, it is required to deploy a large integration of green energies. Therefore, in the previous and the coming years, there will be a high research and technological interest in the high penetration of converter-based generation. READ MORE

  4. 18. Empirisk bestämning av nollföljdsimpedans hos transformatorer med utdragen deltalindning

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

    Author : Carmen Dahlin; [2020]
    Keywords : ;

    Abstract : The main goal of the thesis is through available data, empirically determine the ratio betweenthe zero and positive-sequence impedance of different transformers with accessible-winding, i.e. when the -winding is loaded. READ MORE

  5. 19. Testing and analysis of an intelligent electronic device (IED) prototype for MTDC overhead line application

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

    Author : Ashen Gomes; [2020]
    Keywords : ;

    Abstract : A key problem faced with the implementation of a multi-terminal direct current (MTDC) grid is fault mitigation. One method extensively researched in mitigating a fault in MTDC is to use protection intelligent electronic devices (IEDs) and fast direct current circuit breakers (DCCBs). READ MORE

  6. 20. Fluid/Material Coupled Numerical Analysis of Single Bubble Collapse Near a Pit on a Wall

    University essay from KTH/Strömningsmekanik och Teknisk Akustik

    Author : Daiki Makii; [2020]
    Keywords : Bubble Dynamics; Cavitation Erosion; Numerical Analysis; Fluid Material Coupled Numerical Method; Homogeneous Model; Elastic Body Material; Erosion Pit;

    Abstract : In order to elucidate the progression mechanism of cavitation erosion, the behaviors of a single cavitation bubble collapse near a pit on a wall and both the resulting pressure wave in fluid and stress wave in material are investigated in detail. To find out the mechanism of cavitation erosion, many experimental studies on the bubble collapse behavior near a flat rigid wall and the resulting material damage have been conducted so far. READ MORE