Embedded Multi-Terminal MMC-HVDC System Small-Signal Modeling and Stability Analysis

作者：Zhichao Fu, Jiajun Ou, Haoli Chen, Zhiyang Xie, Zhu Guo · 年份：2025 · DOI：10.1109/isgtasia63446.2025.11431401 · 研究领域：HVDC Systems and Fault Protection、High-Voltage Power Transmission Systems、Power System Optimization and Stability

Embedded MMC-HVDC technology, by constructing 220 kV DC support corridors between urban$\mathbf{5 0 0 k V}$supply zones, offers advantages such as rapid power regulation, active short-circuit current suppression, and asynchronous grid interconnection, enabling precise power flow control and fault isolation. However, existing research on the small-signal stability of embedded MMC-HVDC exhibits multiple limitations: either neglecting grid-forming control strategies, omitting internal dynamics such as submodule capacitor voltage fluctuations and harmonic circulating currents, or lacking comprehensive analysis of multi-terminal interactions via DC lines, AC-side control coupling in the embedded configuration, and the stability of hybrid grid-following/grid-forming systems. To address these gaps, this paper establishes a full-order small-signal state-space model for the embedded multi-terminal MMCHVDC system that integrates internal dynamics and multicontrol coupling. High-sensitivity control parameters critical for small-signal stability are identified through oscillation mode and participation factor analysis. The influence patterns of these parameters on system eigenvalues are revealed via eigenvalue loci analysis. Finally, the model accuracy and correctness of the parameters analysis are validated based on electromagnetic transient simulations in PSCAD/EMTDC, thereby providing theoretical support for the stable control design of embedded MMC-HVDC systems in complex urban power...