Dynamic stability of power systems with high penetration of power electronic-based interfaces

The main focus of the project is to analyse the dynamic stability of power converters, starting from a detailed evaluation of how to represent converters and their surrounding AC power systems for system-wide dynamic stability analysis. Due to the large bandwidth of the converters and their controllers, dynamic interactions with the surrounding AC systems are no longer necessarily limited to low-frequency interactions, but can also include higher frequency resonances between the AC systems and different converters, amplified through the converter controls. These relatively new types of interactions are challenging the use of traditional phasor-based analysis tools for studying the system dynamics. The project aims at understanding and defining the limits of phasor-based models for local and system-wide control studies involving high amount of power-electronics and propose solutions for the modelling and simulation of such issues. The results will provide guidelines on the level of details needed to analyse various dynamic phenomena in the AC system. The findings of the dynamic stability study will be benchmarked against an EMT implementation.