Real-time Subsynchronous Control Interaction Monitoring Using Improved Intrinsic Time-scale Decomposition

In recent years, subsynchronous control interaction (SSCI) has frequently taken place in renewable-connected power systems. To counter this issue, utilities have been seeking tools for fast and accurate identification of SSCI events. The main challenges monitoring are the time-varying nature uncertain modes Accordingly, paper presents a simple but effective method that takes advantage intrinsic time-scale decomposition (ITD). purpose is to improve accuracy robustness ITD by incorporating least-squares method. Results show proposed strikes good balance between dynamic performance estimation accuracy. More importantly, does not require any prior information, its therefore affected frequency constitution SSCI. Comprehensive comparative studies conducted demonstrate usefulness through synthetic signals, electromagnetic temporary program (EMTP) simulations, field-recorded data. Finally, real-time simulation tests feasibility monitoring.