Black-Box Based Grid-Connected Stability Analysis Method for Grid-Following Inverters

With the increasing number of power electronic devices in the grid, the safe and stable operation of the power system faces significant challenges. To address this challenge, it is crucial to perform grid stability analysis before connecting power electronic devices. For grid-following VSC-based devices, stability of a multi-VSC grid system can be assessed by obtaining measurement models and operating point data for individual VSCs. This method is suitable for black-box devices and is easy to measure in the laboratory, making it suitable for approximate stability analysis during the planning stage. Finally, the effectiveness of this method is validated through case studies.