9 papers
A Feedback Stability Theorem for Frequency-dependent Compensation of Excess and Lack of Passivity
Pol Jane-Soneira, Gösta Stomberg, Ognjen Stanojev +2
This article studies the stability of feedback interconnections of linear time-invariant systems based on frequency-dependent passivity indices. Using these frequency-dependent pas…
Dynamic Optimization of Virtual Inertia and Damping in Converter-Based Power Systems
Jovan Krajacic, Maitraya Avadhut Desai, Ognjen Stanojev +1
The transition towards a sustainable power system is enabled by the replacement of conventional synchronous generators with converter-interfaced renewable energy sources. However,…
Exploring Converter Control Duality in Microgrids: AC Grid-Forming vs DC Droop Control
Jovan Krajacic, Ognjen Stanojev, Mario Schweizer +3
Power electronic converters are fundamental building blocks of both AC and DC microgrids, enabling the integration of renewable energy sources, energy storage systems, electronic l…
Grid-Forming Characterization in DC Microgrids
Jovan Krajacic, Ognjen Stanojev, Mario Schweizer +3
DC microgrids are converter-based electrical networks that are increasingly being used in various applications, including data centers and industrial distribution systems. A centra…
EMT and RMS Modeling of Thyristor Rectifiers for Stability Analysis of Converter-Based Systems
Ognjen Stanojev, Pol Jane Soneira, Gösta Stomberg +1
Thyristor rectifiers are a well-established and cost-effective solution for controlled high-power rectification, commonly used for hydrogen electrolysis and HVDC transmission. Howe…
The role of VSG parameters in shaping small-signal SG dynamics
Ferdinand Geuss, Orcun Karaca, Mario Schweizer +1
We derive a small-signal transfer function for a system comprising a virtual synchronous generator (VSG), a synchronous generator (SG), and a load, capturing voltage and frequency…