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Synthetic Test Circuit (STC) system for thyristor valve of current-type High Voltage Direct Current (HVDC) typically consists of a low-voltage high-current and a high-voltage low-current source. In order to provide the isolation between each source, auxiliary valve should be inserted, and its voltage and current ratings are greater or equal to those of the test thyristor valve. To ensure the turnoff...
Synthetic test circuit (STC) for thyristor valve test consists of a low-voltage high-current source to provide the forward current during turn-on state and a low-current high-voltage source to provide the reverse and forward voltage during turn-off state. This paper proposes a new low-voltage high-current source for STC that has a six-pulse thyristor converter and a two-phase chopper with an auxiliary...
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