All the HVDC schemes are based on thyristors but with no gate tum-off capability.

All the HVDC schemes are based on thyristors but with no gate tum-off capability. Correct Answer True

Practically speaking, all the HVDC schemes are basically based on thyristors with no gate turn-off capability. Fundamentally they employ 12-pulse converters, which can function either as a voltage-controlled rectifier (ac to dc) or as inverter (dc to ac). The voltage control can be achieved from maximum positive to maximum negative, keeping the current flowing in the same direction. Thus reversal of power flow can be achieved with reversal of voltage only keeping unidirectional current. Such converters are termed current-sourced converters and are more economical for large HVDC schemes but are also useful in FACTS technology.
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Related Questions

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