Abstract
The hybrid DC circuit breaker (HCB) is an important equipment for clearing DC faults and maintaining the safe operation of DC grids. The current transition from a mechanical switch to a power electronic switch has always been a crucial issue in HCB, and existing HCBs generally require dedicated auxiliary commutation devices, which bring additional cost and size. To address the key issue, this letter proposes an improved thyristor-assisted hybrid DC circuit breaker (TA-HCB) solution. A novel thyristor commutation module (TCM) integrated into the transfer branch not only enables current commutation, but also can assist the power electronic switch in withstanding a portion of the static DC voltage during interruption, greatly reducing the volume and cost of the HCB. After a detailed illustration of the operation process and the voltage distribution process, a 3 kV/ 6 kA prototype experiment was conducted to verify the feasibility of this TA-HCB.
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