Comparative study between gate firing units for CIGRE benchmark HVDC rectifier

This paper presents a comparative simulation study between the DQO gate firing unit (GFU) and a proposed GFU for high voltage direct current (HVDC) system, using the CIGRE benchmark model in the Matlab/Simulink environment. The proposed GFU does not use traditional phase lock loop (PLL) and offers structural simplicity, fast response and immunity to ac system voltage unbalance, harmonics, voltage sag, frequency jump and phase jump etc. Since there is no loop filter, no tuning issues are involved.