A σ source DC solid-state circuit breaker

Abstract

The application discloses a sigma source direct current solid-state circuit breaker, which comprises a direct current power supply, wherein a positive electrode of the direct current power supply is connected with an anode of a thyristor, a negative electrode of the direct current power supply is connected with one port of a line equivalent inductor, a cathode of the thyristor is connected with an input end of a sigma source coupling module, an output end of the sigma source coupling module is connected with one end of a post-stage load, and the other port of the post-stage load is connected with the other port of the line inductor. In the sigma source coupling module, coupling ends of a primary inductor and a capacitor of a transformer are connected with the cathode of the thyristor, two non-coupling ends of the primary inductor and the secondary inductor of the transformer are connected, and a coupling end of the secondary inductor of the transformer is connected with the post-stage load. The sigma source direct current solid-state circuit breaker is constructed by utilizing the unique through mode of the sigma source to realize microsecond-level breaking of short-circuit faults, the sigma source coupling inductor network is introduced into the traditional Z source circuit breaker, the topological structure is simplified, the dependence of the performance of the circuit breaker on the capacitor parameters is reduced, and the mis-trip caused by sudden change of the load is avoided.

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