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Impact of Multi-terminal HVDC Grids on Transient Behavior: Modelling and Analysis

This thesis explores the impact of multi-terminal HVDC systems on transmission system transient behavior, focusing on fault detection and location algorithms, signal denoising, and DC breaker design using PSCAD environment. The research aims to improve protection schemes for MTDC systems facing challenges due to integrating renewable energy sources. The study investigates MTDC topology influence on post-fault transient behaviors and aims to develop a universal fault detection algorithm capable of isolating faults within 0-10ms. Challenges include EMT system modeling, fault-tolerable converter design, and DC breaker control. Methodology involves decoupled control modeling, VSC converter modeling, wavelet transform for fault detection, and MATLAB/Fortran for fault location algorithms with software synchronization in PSCAD and MATLAB.

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Impact of Multi-terminal HVDC Grids on Transient Behavior: Modelling and Analysis

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  1. The Impact of Multi-terminal HVDC Grids on The Transient Behavior in Transmission Systems - Modelling And Analysis Lian Liu PhD Thesis Factsheet

  2. Thesis Factsheet • Protection Scheme for The Multi-terminal HVDC System • Lian Liu • 1.10.2013 / 1.10.2017 • EWI/ ESE/ IEPG • Marjan Popov, Mart van der Meijden • China Scholarship Council

  3. Thesis content • Motivation, background • There is a trend for integrating large amount of renewable energies into power grid; • Conventional protection methods are insufficient for the MTDC system; • The design of DC breaker needs the estimation of short circuit currents. • Research question • The influence of MTDC topology on the post-fault transient behaviors; • The algorithms that are suitable for the fault detection and location (CWT? DWT? SWT? etc.); • Signal denoising; • Algorithm in PSCAD environment.

  4. Expected results • The transient studies after DC faults; • The algorithm can detect and isolate fault within 0-10ms; • The algorithm should be universal method for every converter in the network; • The attempt on the design of DC breaker.

  5. Thesis challenge • The modelling of the whole system in EMT software, e.g. PSCAD/EMTDC; • Design of fault tolerable AC/DC converter; • Insulation coordination study on the test DC grid; • A feasible topology and control of DC breaker.

  6. Methodology • Modelling of MTDC system : decoupled control, VSC converter modelling, • Fault detection method: Wavelet transform, Travelling wave theory, etc. • Fault location algorithm: M language of Matlab, Fortran language of PSCAD… • Software synchronization: PSCAD and Matlab.

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