Optimal Tuning of Active Power Gradient Control in Multi-Energy HVAC-HVDC Power Systems

Power systems nowadays are experiencing a significant energy transition characterized by the progressive increment of power electronic interfaced units. Voltage source converters are extensively utilized to interconnect renewable energy sources at various transmission levels, facilitate the asynchronous interconnection of system areas through...

Contesting Conservatism with Complexity: Exploring Linear Relaxations of the Positivstellensatz for Robust Stability Analysis of Nonlinear Systems

Lyapunov's 2nd method can be formulated as a convex optimization problem by means of Sum-of-Squares (SOS) optimization. This gives a powerful tool for robust stability analysis of nonlinear systems. The use of SOS optimization is limited to small dynamical systems, because of the demanding numerical complexity underlying SOS optimization. For...

Small-Signal Stability Modelling and Analysis of Modular Multilevel Converter and its Closed-Loop Controllers

As the transformation of the electricity generation progresses, the number of power electronic-based devices connected to the electricity grid is expected to grow. To ensure the stability of the power system in a scenario with high penetration of power electronic converters, the dynamics and stability characteristics of these devices have to be...