Descripció del projecte
Modern power systems are undergoing a profound transition towards architectures dominated by electronic power converters. During this transition, synchronous machines, converters of various types, HVDC links and diverse control strategies must coexist within the same network. The heterogeneity of technologies and dynamic behaviors introduces a high risk of adverse interactions, including resonances, oscillatory modes and loss of stability.
The increasing deployment of grid-forming converters (GFMs), now considered essential in emerging low-inertia systems, adds to the diversity of dynamic behaviors already present in networks containing synchronous machines, grid-following converters (GFLs), LCC-HVDC systems, and FACTS devices. The simultaneous operation of these heterogeneous technologies can lead to complex dynamic couplings whose mechanisms are still not fully understood. This complexity highlights the need for analytical tools capable of accurately representing the dynamics of modern converter-based systems.
Traditional stability analysis techniques, originally developed for machine-dominated networks and LCC-HVDC systems, do not adequately represent the fast control loops, reduced passivity, and nonlinear characteristics typical of contemporary converter-based systems. There is an urgent need for systematic research to identify interaction risks and develop methodologies that reflect current system dynamics. This project aims to establish a rigorous framework to identify, characterize, and mitigate negative interactions in converter-dominated networks, with a special emphasis on the behavior of the GFM converter. A central component is the development of control strategies and methodological guidelines to ensure passivity, suppress resonant conditions, and prevent destabilizing interactions between heterogeneous devices.
The proposed solutions will be implemented and validated through a multilayer approach. Linear analyses will be used to detect critical modes and interaction mechanisms. Electromagnetic transient (EMT) simulations will capture nonlinear and high-bandwidth effects. Finally, experimental validation will be carried out using Controller-Hardware-in-the-Loop (C-HIL) and Power-Hardware-in-the-Loop (P-HIL) platforms to evaluate the real-time controller performance and confirm the system stability.
Project structure
Part 1: Identification and characterization of interaction mechanisms in mixed technology power systems
Part 2: Development of modern analysis techniques to detect interaction and resonance risks
Part 3: Design of passive control strategies for converter controllers
Part 4: Validation using small signal analysis, EMT simulations and C-HIL/P-HIL tests
