In HVDC system a converter acts as a rectifier when the firing angle &...
Of the thyristors is controlled to convert AC to DC power. The rectifier converts the AC power from the AC power source into DC power, which is then transmitted over the HVDC transmission line. The converter also acts as an inverter when the firing angle of the thyristors is controlled to convert DC to AC power. This is done at the receiving end of the HVDC transmission line to convert the DC power back into AC power that can be used by the AC power grid. The converter is a crucial component of any HVDC system, as it is responsible for converting power between AC and DC formats.