Title :
Control of transformerless MMC-HVDC during asymmetric grid faults
Author :
Timofejevs, Artjoms ; Gamboa, Daniel ; Liserre, Marco ; Teodorescu, Remus ; Chaudhary, Sanjay K.
Author_Institution :
Dept. of Energy Technol., Aalborg Univ., Aalborg, Denmark
Abstract :
Modular multilevel converter (MMC) is the latest converter topology suitable for the transformerless applications in HVDC transmission. HVDC systems are required to remain connected during grid faults, provide grid support and completely decouple the healthy side from the faulty one. The MMC converter weak points are challenged by this particular condition and by these demands. This paper demonstrates the effect of negative and zero sequence current control in MMC-HVDC during asymmetric grid faults. A current limitation strategy for MMC is derived and verified through simulations.
Keywords :
HVDC power convertors; HVDC power transmission; electric current control; power grids; HVDC systems; HVDC transmission; MMC converter; asymmetric grid faults; current control; modular multilevel converter; transformerless MMC-HVDC control; Capacitors; Current control; HVDC transmission; Oscillators; Reactive power; Topology; Voltage control; HVDC; Modular Multilevel Converter (MMC); unbalanced faults;
Conference_Titel :
Industrial Electronics Society, IECON 2013 - 39th Annual Conference of the IEEE
Conference_Location :
Vienna
DOI :
10.1109/IECON.2013.6699441
