D21.1 - Three-Stage Adaptive Control Strategy for Stability Improvement of Grid-Connected Inverter in Weak Grid

Thursday, March 20, 2025

11:30 AM – 1:30 PM ET

Location: Level One, Hall A3

Technical Dialogue Presenter(s)

Longxiang You (he/him/his)

College of Electrical Engineering, Zhejiang University

Presentation Paper

Co-Author(s)

SJ

Sicong Jin

College of Electrical Engineering, Zhejiang University
XZ

Xin Zhang

College of Electrical Engineering, Zhejiang University
ZW

Zuoshuai Wang

Wuhan Second Ship Design and Research Institute
SW

Sunqing Wang

China Ship Scientific Research Center

With the extensive construction of new energy power system , the interaction between grid-connected inverter(GCI) and weak grid may easily induce oscillation instability problem. To improve the adaptability of GCI under different operating conditions, a three-stage adaptive control strategy based on voltage feedforward is proposed, which can switch three adaptive control strategies according to different operating conditions respectively. In each stage, SA-PSO algorithm is utilized to design feedforward path and control parameters in each operating condition sample, and then the polynomial fitting method is utilized to cover the continuous full operating range, which can be used to adaptively adjust the parameters. The proposed adaptive control strategy can ensure the better stability margin of GCI under different conditions. Finally, the OPAL-RT semi-physical experiment platform is used to verify the proposed strategy.