In September 2026, I attended ECCE (Energy Conversion Congress and Expo) Europe 2026 in Valencia, Spain. Here, I presented our paper, “Impedance Reshaping for Objective-Driven Strength Improvement in Grey-Box Multiconverter Grids”, in the “HVDC Transmission, MMC Converters and DC Grid Stability” session.

 

My PhD research focuses on the stability of power electronic based power systems. Interactions between converters and the network may cause oscillations that under certain conditions result in system instability and disconnection of equipment. Assessing and improving stability is particularly challenging in systems where network information is available but detailed converter controls are not fully accessible. These systems are referred to as ‘grey box’. The work presented in the paper addresses this challenge and forms an important part of my PhD.

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In my talk, I explained how we use disk margin theory to assess the system-level stability margin and relate it to the converter-level margin at a specific bus. We then use the analysis results to tune the converter control settings. By changing its output impedance characteristics, we can improve the stability margin of the whole system. During the Q&A session, I also discussed how the method compares with existing approaches and which aspects still need further work.