What is the development process of thyristors for DC transmission?
2021-08-21
Since the 2-inch thyristor valve was used to replace the mercury arc valve in 1967, each expansion of thyristor area has brought the advantages of improving transmission capacity, reducing loss, simplifying valve structure and improving reliability. Therefore, with the continuous increase of DC transmission capacity and the progress of power electronics technology, the thyristor for DC transmission has developed from the initial 2 inches to the current 6 inches.
The Zhoushan and Shengsi HVDC transmission projects built by China in the 1980s used 2-inch thyristors, the Genan UHVDC project built in the late 1980s used 3-inch thyristors, and the Tianguang project built in the 1990s used 4-inch thyristors. The first 3 million KW three constant DC transmission project completed and put into operation in the early 21st century began to use 5-inch thyristors. Only Japan has used 6-inch thyristors in the world. The Kii waterway DC project put into operation in 2000 adopts 6-inch thyristors.
The Zhoushan and Shengsi HVDC transmission projects built by China in the 1980s used 2-inch thyristors, the Genan UHVDC project built in the late 1980s used 3-inch thyristors, and the Tianguang project built in the 1990s used 4-inch thyristors. The first 3 million KW three constant DC transmission project completed and put into operation in the early 21st century began to use 5-inch thyristors. Only Japan has used 6-inch thyristors in the world. The Kii waterway DC project put into operation in 2000 adopts 6-inch thyristors.