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Hosseinian, Parastoo Sadat

University of British Columbia

The AC-DC line-commutated converters and voltage-source converters are widely used ‎in various high-power applications. It is imperative to conduct efficient and precise computer ‎simulations for practical and reliable analysis, design, and study of converter-based power ‎systems. However, detailed switching models of such converters offered by many commercial ‎electromagnetic transient (EMT) simulation programs are known to be computationally ‎expensive. ‎ The average-value modelling (AVM) technique has been developed to achieve ‎computationally efficient models of ac-dc converters for system-level studies. The AVMs ‎neglect the switching and capture the averaged dynamics of converters only. This thesis ‎advances the state-of-the-art and develops computationally efficient and accurate models of ac-‎dc converters for EMTP-type simulation programs. The proposed approach is able to ‎reconstruct the converter waveforms, including all ac harmonics and dc ripples, without ‎switching circuit elements. Two interfacing methods of the proposed model are presented for ‎indirect and direct interfacing in EMTP-type solutions. The proposed modelling approach is ‎demonstrated to have superior computational efficiency and the ability to accommodate larger ‎time steps compared to detailed switching models of line commutated converters (LCCs) and ‎voltage source converters (VSCs) in ac-dc power systems. It is envisioned that the new models ‎will become adopted by many commonly used offline and real-time EMT simulators.‎

Text

2023-08-23

Attribution-NonCommercial-NoDerivatives 4.0 International

http://hdl.handle.net/2429/85582

Electrical and Computer Engineering

University of British Columbia

UBCV

http://creativecommons.org/licenses/by-nc-nd/4.0/