Abstract
This chapter considers the structure and working principles of UHVDC converters and the main considerations in converter connection. Since converter valves are always at the core of HVDC transmission systems, the working principles of high-power DC converter valves, including six-pulse inverters, 12-pulse converters, and the double 12-pulse converter are discussed. At present, increasing DC voltage and DC current remains a major means to lift DC transmission power. So far, the thyristor remains the power electronic device with the highest voltage withstand and current-carrying capability. For this reason, high-voltage, large-capacity DC transmission projects all use thyristor valves, including the electrically triggered thyristor and the light-triggered thyristor developed from the former. Six-inch thyristor valves are now the largest-capacity converter valves, and represent the world's leading DC transmission technology, so the functions, working principles, and characteristics of these UHVDC converter valves are presented along with the performance requirements of the system using UHVDC converter valves, including types of overload capabilities.
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