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EMT and RMS Modeling of Thyristor Rectifiers for Stability Analysis of Converter-Based Systems
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EMT and RMS Modeling of Thyristor Rectifiers for Stability Analysis of Converter-Based Systems
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EMT and RMS Modeling of Thyristor Rectifiers for Stability Analysis of Converter-Based Systems
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Paper
EMT and RMS Modeling of Thyristor Rectifiers for Stability Analysis of Converter-Based Systems
2026
Overview
Thyristor rectifiers are a well-established and cost-effective solution for controlled high-power rectification, commonly used for hydrogen electrolysis and HVDC transmission. However, small-signal modeling and analysis of thyristor rectifiers remain challenging due to their line-commutated operation and nonlinear switching dynamics. This paper first revisits conventional RMS-based modeling of thyristor rectifiers and subsequently proposes a novel nonlinear state-space EMT model in the dq domain that can be linearized for small-signal analysis. The proposed model accurately captures all the relevant dynamic phenomena, including PLL dynamics, the commutation process, and switching delays. It is derived in polar coordinates, offering novel insights into the impact of the PLL and commutation angle on the thyristor rectifier dynamics. We verify the RMS and EMT models against a detailed switching model and demonstrate their applicability through small-signal stability analysis of a modified IEEE 39-bus test system that incorporates thyristor rectifier-interfaced hydrogen electrolyzers, synchronous generators, and grid-forming converters.
Publisher
Cornell University Library, arXiv.org
