New GFC model tackles oscillations in wind farm converter systems

Researchers from Shanghai Jiao Tong University and Norwegian University of Science and Technology have introduced the Generalized Feedback Control (GFC) model, a novel frequency-domain modeling framework aimed at addressing control-driven stability issues in converter systems such as wind farms. Traditional impedance-based methods are limited by their implicit controller modeling, hindering system analysis and design for large-scale controller deployments. The GFC model shifts perspective from the circuit to the control system, resulting in a multi-input-multi-output (MIMO) feedback control structure with explicit controller placement.

Validated through frequency scans and stability tests for both single and multi-converter cases, the GFC approach demonstrates advantages in interaction analysis and stability-oriented multi-controller designs. Three application examples further highlight its potential for analyzing and designing converter systems involving large-scale controllers. This work could help prevent oscillations and improve reliability in renewable energy grids.