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 the electromechanical low-frequency oscillations (LFOs). With the increasing applications of converter-based devices in modern power systems, system-wide control interactions between different converter-based devices are causing more prevalent electromagnetic wideband oscillations (WBOs). A lot of research has been done on the design, application, and standardization of classical PSSs for addressing the LFOs associated with synchronous generators. However, little attention is given to the same for converter-based devices as a countermeasure to electromagnetic WBOs. This paper proposes the 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 the WBOs. The NPSSs are not limited to inverter-based resources (type-3/4 wind turbines) but 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 the current research challenges and opportunities in designing and implementing NPSS for various converter-based devices, providing a comprehensive overview of the state-of-the-art and future directions in this area.