Current interruption devices and their control methods, DC power transmission and distribution systems

Abstract

This application provides a current interruption device and its control method, as well as a DC power transmission and distribution system. The current interruption device includes a first current-carrying branch, a second current-carrying branch, a first transfer branch, a second transfer branch, an energy-consuming branch, a reactor, and a self-excited module, wherein: the first current-carrying branch includes a first mechanical switch; the second current-carrying branch includes a second mechanical switch; the second transfer branch includes a capacitor; the energy-consuming branch includes an energy absorption device; the reactor is disposed in the first current-carrying branch and / or the first transfer branch and / or the second transfer branch; the self-excited module is disposed in the first current-carrying branch, the first transfer branch, or the second transfer branch; in the event of a short-circuit fault in the power line, the self-excited module outputs a pulsed square wave voltage to excite the capacitor and the reactor to oscillate, generating an oscillating current with the same amplitude and opposite direction to the fault current, thereby shutting off the first and second mechanical switches, and the energy absorption device is used to consume energy.

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