Abstract
Hybrid DC circuit breaker (HDCCB) takes advantage of both mechanical and solid-state breakers, the low-loss and fast-breaking characteristics are suitable for MMC-HVDC system. Because the existing DC protection cannot act fast enough, the limitation of fault current based on HDCCB has become an prospective technology. This work proposes a modular hybrid DC circuit breaker (MHDCCB) at first which can self-adaptively control current limiting and current clearing according to the protection action signal after fault. The new topology can be switched to primary current-limiting state and backup current-limiting state, which reserves enough time for fault detection and location. After receiving trip signal, current-limiting reactor can be bypassed to accelerate current clearing speed. Then, the cooperation strategy of protection system and MHDCCB is analyzed. Finally, the simulation cases are carried out to verify the working principle, protection coorperation strategy, and superiorities of the proposed MHDCCB. The technology presented in the paper alleviates the speed limitation of protection and benefits the safty operation after fault in high-voltage and large-capacity MMC-HVDC systems with overhead transmission lines.
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