D05.5 - Robust Grid-Forming Control Based on Virtual Flux Observer

Thursday, March 26, 2026

12:00 PM - 1:45 PM CT

Location: Hemisfair Ballroom

Technical Dialogue Presenter(s)

Xueqing Gao

UMich-SJTU Joint Institute, Shanghai Jiao Tong University

Presentation Paper

Co-Author(s)

JZ

Jun Zhang

UMich-SJTU Joint Institute, Shanghai Jiao Tong University
Tao Li, MS

Spintrol Electronic Technology Co., Ltd
Mingming Zhang

Student Innovation Center, Shanghai Jiao Tong University

This research investigates the design and analysis of a PCC voltage-stiff control strategy for grid-connected converters (GCCs) with improved robustness across a wide range of grid strengths. The core novelty lies in a flexible synchronization method based on a virtual flux observer. For the grid-forming purpose discussed in this digest, the load angle, and consequently the active power, are implicitly controlled by the synchronization observer. Meanwhile, the PCC voltage magnitude is directly regulated through a compact control law. The proposed control strategy is supported by a thorough small-signal analysis of the closed-loop system to enable decoupling gain design and stability assessment in state-space. Both simulation and experimental validations are performed to demonstrate the robust performance of the proposed method.