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1. An apparatus for breaking a line bidirectional current, comprising a breaking current branch circuit and an on-state current branch circuit, wherein the breaking current branch circuit comprises one nonlinear resistor being connected in parallel to one first power semiconductor device, or one nonlinear resistor being connected in parallel to at least two first power semiconductor devices mutually connected in series; and the on-state current branch circuit comprises at least one bidirectional power semiconductor switch being connected in series to at least one high-speed isolation switch, wherein:
the apparatus also comprises a bridge-type branch circuit, and the bridge-type branch circuit comprises two bridge arms constituted by four identical current commutation branch circuits, each current commutation branch circuit comprising at least one second power semiconductor device connected in series; every two of the four commutation branch circuits are connected in series a same direction, and the formed two bridge arms are further connected in parallel; and a connection relationship of the apparatus is selected from a group consisting of: a) the apparatus comprises a breaking current branch circuit, an on-state current branch circuit, and a bridge-type branch circuit, wherein two ends of the on-state current branch circuit are respectively connected to bridge arm middle points of two bridge arms of the bridge-type branch circuit, and the two bridge arms are both connected in parallel to the breaking current branch circuit; b) the apparatus comprises at least two groups of a breaking current branch circuit, an on-state current branch circuit, and a bridge-type branch circuit, wherein in each group, two ends of the on-state current branch circuit are respectively connected to bridge arm middle points of two bridge arms of the bridge-type branch circuit, and the two bridge arms are both connected in parallel to the breaking current branch circuit; and all the on-state current branch circuits are connected in series in sequence; c) the apparatus comprises an on-state current branch circuit and at least two groups of a breaking current branch circuit and a bridge-type branch circuit, wherein in each group, two bridge arms of the bridge-type branch circuit are both connected in parallel to corresponding breaking current branch circuits, and bridge arm middle points of the bridge-type branch circuit in each group are connected in series in sequence; and two ends of the on-state current branch circuit are respectively connected to bridge arm middle points of end portions of the first bridge-type branch circuit and the last bridge-type branch circuit in the circuits connected in series; and d) the apparatus comprises an on-state current branch circuit, a bridge-type branch circuit, and at least two breaking current branch circuits, wherein after being connected in series in sequence, the respective breaking current branch circuits are further connected in parallel to two bridge arms of the bridge-type branch circuit, and two ends of the on-state current branch circuit are respectively connected to bridge arm middle points of the two bridge arms of the bridge-type branch circuit. |
