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| Fig: Schematic Line Diagram of HVDC Power Transmission |
What is High Voltage DC Transmission?
High-voltage direct current (HVDC) technology offers several advantages compared to alternating current transmission systems. Generally, HVDC (high-voltage direct current) transmission requires a converter station at both sending end and receiving end. The converter stations are transformers and thyristor valves. At sending end thyristor valves act as a rectifier to convert ac into dc which is transmitted over the line, whereas at the receiving end, thyristor valves act as an inverter to convert dc into ac which is utilized at receiving end. Each converter can function as a rectifier or inverter. Thus power can be transmitted in either direction. The figure above shows the schematic line diagram of a typical HVDC power transmission line.
