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ORIGINAL RESEARCH article

Front. Energy Res.
Sec. Sustainable Energy Systems
Volume 12 - 2024 | doi: 10.3389/fenrg.2024.1437287
This article is part of the Research Topic Emerging Technologies for the Construction of Renewable Energy-Dominated Power System View all 29 articles

Stability Analysis and Stabilization Control of A Grid-forming VSC-HVDC System

Provisionally accepted
Yi Lu Yi Lu 1Gang Shi Gang Shi 2*Qian Chen Qian Chen 1Peng Qiu Peng Qiu 1Jianqiao Zhou Jianqiao Zhou 2Renxin Yang Renxin Yang 2Jianwen Zhang Jianwen Zhang 2
  • 1 State Grid Zhejiang Electric Power Co., Ltd., Hangzhou, China
  • 2 Shanghai Jiao Tong University, Shanghai, China

The final, formatted version of the article will be published soon.

    As the penetration of the integrated intermittent and fluctuant new energy (e.g. wind and photovoltaic power) increases, the conventional grid-following voltage source converter (VSC)-based high voltage direct current (HVDC) transmission system faces the problem of interactive instability with the grid. To overcome these above issues, a novel grid-forming control strategy is proposed, which adopts the dynamic of DC capacitor to realize the function of self-synchronization with the grid. Moreover, the per-unit DC voltage can automatically track the grid frequency, acting as a phase locked loop. Next, the small-signal model of the grid-forming VSC-HVDC system is established, and the stability of the system is analyzed by the eigenvalue analysis method and the complex power coefficient method. In addition, the stabilization controller is proposed to the GFM control structure, which further enhances the grid-forming VSC-HVDC system's stability and helps to operate stably under both stiff and weak grid conditions. Research results show that the VSC-HVDC system under the proposed grid-forming control is able to work stably in both stiff and weak grids. The grid-forming VSC-HVDC system has strong robustness, and can remain stable operation with large range variation of the parameters in the current and voltage control loop. Simulations are carried out on the platform of the PSCAD/EMTDC to verify the proposed grid-forming control strategy.

    Keywords: Grid-forming control, VSC-HVDC, state space modeling, interaction stability, weak grid, stabilization control

    Received: 23 May 2024; Accepted: 19 Jul 2024.

    Copyright: © 2024 Lu, Shi, Chen, Qiu, Zhou, Yang and Zhang. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

    * Correspondence: Gang Shi, Shanghai Jiao Tong University, Shanghai, China

    Disclaimer: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.