The HVDC converters are an HVDC systems hearts . They perform the conversion from ac to dc (rectiﬁer) at the sending end and from dc to ac (inverter) at the receiving end. HVDC converters are connected to the ac system by means of converter transformers. The VSC- HVDC converters are voltage source converters (VSCs). The dc voltage is kept constant. Three-level bridge IGBT based converter was used for the VSC-HVDC transmission. Sine- triangle modulation switching frequency ratio of 27 was used to control the switches. Series RC snubber circuits are connected in parallel with each switch device. Thus 5 kῼ snubbed resistors are used in addition to the 1µF capacitances for this purpose.
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