| 摘要 |
The present invention provides an apparatus for bypassing a phase current from a malfunctioning sub module in a converter. The converter includes multiple sub modules each having an energy storage unit, and at least one power semiconductor circuit which is connected in parallel to the energy storage unit and which includes a power semiconductor switch and free-wheeling diodes, wherein the sub modules are connected in series to each other. The bypass apparatus for a converter according to the present invention comprises: a vacuum switch tube for disconnecting between a first connection terminal and a second connection terminal of a malfunctioning sub module upon the occurrence of a malfunction in a specific sub module and bypassing a phase current from said malfunctioning sub module; and a control device for controlling the operation of the vacuum switch tube. The control device comprises: permanent magnets having different polarities and guiding the disconnecting and canceling operations of the vacuum switch tube; a core fixed to enable the permanent magnets to contact or be separated from the core; a coil wound around the core; a power source unit for applying power to the coil; and a control unit for controlling the supply of power from the power source unit to the coil upon the occurrence of a malfunction in the sub module. The control unit controls the power source unit such that the power is supplied to the coil upon the occurrence of a malfunction in the sub module and the permanent magnets are pushed out by the magnetic properties induced in the core so as to guide the disconnecting operation of the vacuum switch tube and bypass the phase current. |
