Impact of VSC Converter Topology on Fault Characteristics in HVDC Transmission Systems

Tzelepis, Dimitrios and Ademi, Sul and Vozikis, Dimitrios and Dysko, Adam and Subramanian, Sankara (2016) Impact of VSC Converter Topology on Fault Characteristics in HVDC Transmission Systems. In: 8th IET International Conference on Power Electronics, Machines and Drives, 2016-04-19 - 2016-04-21, The Hilton Hotel.

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This work presents the outcome of a comprehensive study that assesses the transient behaviour of two high voltage direct current (HVDC) networks with similar structures but using different converter topologies, termed two-level and half-bridge (HB) modular multilevel converter (MMC). To quantify the impact of converter topology on DC current characteristics a detailed comparative study is undertaken in which the responses of the two HVDC network transients during dc side faults are evaluated. The behaviour of the HVDC systems during a permanent pole-to-pole and pole-to-ground faults are analysed considering a range of fault resistances, fault positions along the line, and operational conditions as a prerequisite. Fast Fourier Transform (FFT) has been conducted analysing di/dt for both converter architecture and fault types taking into consideration sampling frequency of 96 kHz in compliance with IEC-61869 and IEC-61850:9-2 for DC-side voltages and currents.