An Innovative Software for Stability Analysis of Multi-Energy Grids
Oriol Cartiel, Luis Sainz and Juan José Mesas Department of Electrical Engineering (DEE), Escola Tècnica Superior d’Enginyeria Industrial de Barcelona (ETSEIB), Universitat Politècnica de Catalunya - BarcelonaTech (UPC), Barcelona, Spain. 2026-02-15

Abstract

To effectively deal with the urgent climate crisis,clean resources and energy efficiency are becoming essential. As a result, renewable energy technologies (e.g., solar PV and wind power), HVDC links, and multi-energy systems have been widely integrated into traditional electrical power systems in recent decades. These technologies and HVDC links provide numerous benefits in driving the energy transition, and multi-energy systems are a promising energy storage/management solution to handle the variable and unpredictable nature of renewable energy technologies. However, despite the many benefits of the above new sustainable energy infrastructures, they also pose new technological challenges, such as small-signal stability problems due to poorly damped resonances caused by the interaction between power electronics and traditional grid elements. Current tools are not fully effective in studying these issues yet. Given this scenario, this paper presents an Innovative Software for Stability Analysis, a novel tool designed for small-signal stability assessment in multi-energy grids. This software enables accurate stability predictions and provides actionable solutions to mitigate instabilities, regardless of system size. Its capabilities are demonstrated through comprehensive MATLAB/Simulink simulations on various systems, including a IEEE 3−bus test system, an AC/DC multi-energy grid with hydrogen vector, and a 70k−bus synthetic test system.

Key words: Damping solutions, multi-energy grids, positive-mode-damping, resonance mode analysis, stability assessment.

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