基 于 磁 耦 合 电 流 转 移 的 阻 尼 式 直 流 开 断 技 术

In the DC system, the short-circuit current rises quickly and the peak value is high. As the voltage level and capacity of the system increase further, the short-circuit current breaking becomes a greater challenge. To reduce the breaking requirements of DC circuit breakers (DCCBs), it is crucial to consider fast fault current limiting in the breaking process. But it is difficult to combine both current limiting and breaking processes in existing DC breaking schemes. In this paper, a new DC circuit breaker topology with integrated current transfer and damping is proposed, which can achieve rapid fault current limiting while ensuring high breaking capacity and low cost. Firstly, the breaking principle of the proposed DCCB is introduced. Then the key influencing factors of the damping module and magnetic coupling transfer module are analyzed to obtain the optimal design of the parameters of the damping module and magnetic coupling module. Finally, based on the simulation model, the proposed breaking scheme is simulated and the breaking adaptability of the proposed topology under different operation conditions and on different voltage levels is verified. The effectiveness of the proposed damping DC breaking scheme is verified through experiments.