Power converting apparatus

Details Power converting apparatus Power converting apparatus

H - Electricity

02

M

H02M 5/45 (2006.01) H02H 7/122 (2006.01)

Patent

CA 2048370

A power converting apparatus comprises self- commutated converter, fault current restricting device, fault detector, and cutoff circuit. Self-commutated converter converts AC power supplied from an AC power system into DC power and supplying the DC power to a common DC circuit, and for converting DC power supplied from the DC circuit into AC power and supplying the AC power to the AC power system. The fault current restricting device is inserted between the self- commutated converter and the DC circuit, and includes a diode provided to permit a DC circuit current to flow from the self-commutated converter to the DC circuit, and a series circuit having a reactor and a DC power supply and connected in parallel to the diode. The fault detector detects a fault current generated when self-commutated converter is short-circuited. When the fault detector detects a short circuit occurring in self-commutated converter, the cutoff circuit cuts off power supply to that self-commutated converter. With this structure, the DC power supply supplies a circulat- ing current according to a rated current of the self- commutated converter to the reactor and the diode.

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