Contribution à l'étude et l'amélioration de la stabilité d'un réseau électrique hybride AC/DC en présence des sources dispersées

Abstract

The global energy transition towards renewable sources has accelerated, driven by climate policies to reduce CO₂ emissions. This transformation changes electrical systems from centralized architectures to complex hybrid AC/DC networks integrating dispersed renewables. While offering sustainable opportunities, it introduces stability challenges due to intermittency, reduced inertia, and power electronics interfaces. This thesis improves stability in hybrid AC/DC systems with dispersed sources by developing innovative modeling, analysis, and control tools. The research reconciles electrical security with energy transition demands, proposing robust solutions for large-scale renewable integration. The work establishes a comprehensive framework through extended stability classification, expanding IEEE categories to include resonance and converter-induced stability for high renewable penetration. Significant advances in VSC-HVDC analysis through a PLL-less method offer architectural simplification and computational reductions while maintaining performance. For DFIG wind systems, coordinated strategies combining virtual inertia and droop control transform decoupled generators into active frequency contributors through software implementation. The approach culminates with BESS integration in DFIG farms, creating hybrid solutions combining renewable flexibility with storage reactivity. Methodologies combine modal analysis, time-domain analysis, and decentralized control, validated through MATLAB/Simulink. This research advances hybrid AC/DC grid knowledge, enabling massive renewable integration without compromising stability and reliability.