D12.14 - Cost-Optimized Resilient Operation of Grid-Forming Cascaded H-Bridge Inverters with Andronov-Hopf Oscillator-Based Parallel Operation

Thursday, March 26, 2026

12:00 PM - 1:45 PM CT

Location: Poster 1

Technical Dialogue Presenter(s)

Vikram Roy Chowdhury (he/him/his)

National Renewable Energy Laboratory

Co-Author(s)

Uthandi Selvarasu

Northeastern University
SW

Shumeng Wang

Northeastern University
Jinli Zhu

University of Pittsburgh
MA

Mahshid Amirabadi

Northeastern University
YL

Yuan Li

University of Pittsburgh
BL

Brad Lehman

Northeastern University

This paper presents a framework for parallel operation of cascaded H-bridge inverters in gridforming mode, emphasizing reliability and cost-effectiveness. Two key contributions are introduced: (i) a hot-swap capability enabling seamless bypass of faulty sub-modules without interrupting load power, and (ii) an optimized sensing scheme using only inverter-side current and dc bus voltage sensors, eliminating ac-side voltage and load current measurements. An internal model-based estimator reconstructs the ac-side voltage and load current in real time, while a nonlinear Andronov–Hopf oscillator serves as a secondary controller to ensure decentralized synchronization. The approach is validated via detailed Matlab/Simulink and Plecs simulations, confirming enhanced power quality, resilience, and efficiency.