Abstract
It has been argued that when a single-line-to-ground fault is applied at
the inverter on the alternating current side, the voltage will drop.
Likewise, when a fault is applied on a LLG fault at the inverter, the
currents of the alter-nating current system of the rectifier will
experience various disturbances. In this study, we focus on a converter
station on the rectifier side of a HVDC system. Three fault cases,
namely, D4D5 open-circuit fault, D1D2 open-circuit fault, and D3D4D6D2
open-circuit fault and their behavior on the alternating cur-rent system
of the rectifier, AC system of the inverter as well as the direct
current link with detailed simu-lations were carried out. An HVDC
mono-polar system was modeled using the MATLAB/Simulink software
environment. It was discovered that the D4D5 and D1D2 open-circuit
faults and the AC system of the rectifier side would both have the same
increase in AC voltages, whereas the behavior of the AC currents of both
faults would remain normal with no effect. It was also shown that during
the D3D4D6D2 open-circuit fault, the alternating current volt-ages and
currents at the inverter side would experience zeros in a short time and
then rise with a false sinusoidal waveform