New-Type Power System Stabilizers (NPSS) for Damping Wideband Oscillations in Converter-Dominated Power Systems

Traditionally, synchronous generators are equipped with power system stabilizers (PSSs) to stabilize electromechanical low-frequency oscillations (LFOs). With increasing applications of converter-based devices in modern power systems, system-wide control interactions between different converter-based devices are causing more prevalent electromagnetic wide-band oscillations (WBOs). Extensive research has been done on design, application, and standardization of classical PSSs for addressing LFOs associated with synchronous generators. However, little attention is given to same for converter-based devices as a countermeasure to electromagnetic WBOs. This paper proposes a concept of utilizing new-type power system stabilizers (NPSSs) specifically designed to address WBOs caused by converter-control interactions in modern converter-dominated power systems. The article puts forward various design strategies, tuning methods, and implementation techniques of the NPSSs to counteract WBOs. The NPSSs are not limited to inverter-based resources (type-3/4 wind turbines); they can also be applied to other converter-based devices such as FACTS controllers, HVDC links, battery storage inverters, etc. We present several application scenarios demonstrating the importance of supplementing NPSSs in converter-based devices. Furthermore, the paper highlights current research challenges and opportunities in designing and implementing NPSS for various converter-based devices, providing a comprehensive overview of state-of-the-art and future directions in this area.