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Grid-forming control to achieve a 100% power electronics interfaced power transmission systems

Taoufik Qoria 1
1 EP - L2EP - Équipe Électronique de puissance
L2EP - Laboratoire d’Électrotechnique et d’Électronique de Puissance - ULR 2697
Abstract : The rapid development of intermittent renewable generation and HVDC links yields an important increase of the penetration rate of power electronic converters in the transmission systems. Today, power converters have the main function of injecting power into the main grid, while relying on synchronous machines that guaranty all system needs. This operation mode of power converters is called "Grid-following". Grid-following converters have several limitations: their inability to operate in a standalone mode, their stability issues under weak-grids and faulty conditions and their negative side effect on the system inertia.To meet these challenges, the grid-forming control is a good solution to respond to the system needs and allow a stable and safe operation of power system with high penetration rate of power electronic converters, up to a 100%. Firstly, three grid-forming control strategies are proposed to guarantee four main features: voltage control, power control, inertia emulation and frequency support. The system dynamics and robustness based on each control have been analyzed and discussed. Then, depending on the converter topology, the connection with the AC grid may require additional filters and control loops. In this thesis, two converter topologies have been considered (2-Level VSC and VSC-MMC) and the implementation associated with each one has been discussed. Finally, the questions of the grid-forming converters protection against overcurrent and their post-fault synchronization have been investigated, and then a hybrid current limitation and resynchronization algorithms have been proposed to enhance the transient stability of the system. At the end, an experimental test bench has been developed to confirm the theoretical approach.
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Submitted on : Wednesday, December 16, 2020 - 5:07:07 PM
Last modification on : Thursday, December 17, 2020 - 4:11:05 AM

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  • HAL Id : tel-03078479, version 1

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Taoufik Qoria. Grid-forming control to achieve a 100% power electronics interfaced power transmission systems. Electric power. HESAM Université, 2020. English. ⟨NNT : 2020HESAE041⟩. ⟨tel-03078479⟩

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