LAUSR

The dc chopper (DCC) is crucial for the offshore wind voltage sourced converter-based high-voltage direct current (VSC-HVdc) system, typically utilizing expensive fully controlled devices. In this letter, an economical concentrated DCC based on thyristors with resonant self-turn-off ability (T-DCC) is proposed. By combining thyristors with an LC circuit, T-DCC achieves continuous operation in the fault ride through (FRT) condition, while employing a buffer inductor to reduce dc-link voltage ripple. Comparative analysis reveals that T-DCC reduces costs by 42% and has good FRT performance. Furthermore, a parameter design method is proposed and a 4 kV/1.2 kA prototype experiment is carried out to verify the feasibility of the T-DCC.