| 摘要 |
A power converting apparatus for system interconnecting includes a self-commutated converter, DC supply or direct capacitor connected to a DC terminal of the self-commutated converter, a series reactor or transformer, connected between an AC terminal of the self-commutated converter and an AC power system. The self-commutated converter includes a plurality of semiconductor valves connected in bridge between P bus and N bus of the DC supply. The semiconductor valves respectively includes a plurality of series-connected nonlatch devices, a series snubber circuit connected in series to the plurality of series-connected nonlatch devices, and a voltage balancing resistor and a plurality parallel snubber circuits respectively which includes a clipper circuit and a series circuit. The series circuit comprises a snubber capacitor and snubber resistor.
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