A paper by Zeng Ruiyuan, a 2023 Master's student in Electrical Engineering of the Zhejiang University–University of Illinois Urbana-Champaign Institute (ZJUI), along with Tenured Associate Professor Diao Ruisheng, Sun Fangyuan, a 2022 doctoral student in Electrical Engineering of ZJUI, and Dr. Zhou Baorong and Dr. Li Junjie from China Southern Power Grid Electric Power Research Institute, has been published in IEEE Transactions on Sustainable Energy (TSTE), a leading Q1 journal in electrical engineering.

The study, titled Dynamic Evolution and Stability Analysis of GFM-Based Renewable Energy Resources Considering Repeated & Continuous Current Saturation, addresses critical stability challenges in grid-forming renewable energy systems (GFM-RES). As modern power grids increasingly rely on renewable energy and power electronics, issues such as repeated (R-CS) and continuous current saturation (C-CS) can cause severe oscillations, overvoltage, and instability—problems that remain poorly understood.

Using hybrid system theory, the authors derived precise switching conditions for current saturation and proposed a new R&C-CS stability criterion, a desaturation region-based principle, and a novel control strategy (S&D-DC). These methods effectively mitigate saturation issues and cut transient recovery time by 18–32%. High-fidelity simulations confirmed the approach’s effectiveness across various system strengths and fault types.

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