Transformerless wind energy system based on a series double NPC multilevel rectifier and a six-phase asymmetrical PMSG

Mayo-Maldonado, Jonathan C., Panagiotou, Panagiotis A., Masoud, Mahmoud I., Lambourne, Alexis, Valdez-Resendiz, Jesus E. and Rosas-Caro, Julio C. (2023) Transformerless wind energy system based on a series double NPC multilevel rectifier and a six-phase asymmetrical PMSG. Zarri, Luca and Lee, Sang Bin (eds.) In Proceedings of the 2023 IEEE 14th International Symposium on Diagnostics for Electrical Machines, Power Electronics and Drives, SDEMPED 2023. IEEE. pp. 613-619 . (doi:10.1109/SDEMPED54949.2023.10271483).

Abstract

This paper introduces a transformerless configuration of generator and power converter that is suitable for offshore wind energy systems. The proposed configuration is based on a series connection of two neutral point clamped (NPC) multilevel rectifiers, powered by a six-phase asymmetrical permanent magnet synchronous generator (PMSG). Additionally, this work proposes a control strategy that opens the door to a fault-tolerance mode, by the use of independent controllers for each NPC converter, directly operating in a large-signal nonlinear space. This closed-loop system permits to prevent disruptions due to faults at either the generator winding or one of the NPC converter, by allowing a modular modification of set-points over the whole system operating region. Simulation results show the feasibility of the proposed configuration, rendering a promising solution for future wind energy generation systems.

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