Development of Compact Perturbation Generator Using Filter-less Inverter for Impedance Measurement of Power Systems and Grid-Connected Distributed Energy Resources

The impedance-based method for stability analysis evaluates the stability of the entire power system using only measured data. It maintains the confidentiality of design details of distributed energy resource (DERs) while ensuring system stability prior to operation. However, the need for large and expensive devices capable of inducing small voltage or current perturbations across a wide bandwidth hinders the broader adoption of this method. To address this challenge, this study explores the potential integration of analysis devices within the DERs themselves, focusing on the development of a perturbation generator and a corresponding algorithm that leverages a compact power converter to generate perturbation voltages. The proposed approach enables precise impedance measurements, including the control algorithms of both the power system and the connected DERs.