Patent ID: 6573690
Filing Date: 2003-06-03
Classification: H02J,Y02E

Abstract:
A power conversion apparatus connected to an AC system, comprising:a self-commutated power converter connected to and receiving power from an AC system; and a feedback control system controlling operation of said self-commutated power converter in response to clearance of a fault on the AC system, the feedback control system including a current sensor for sensing current flowing to said self-commutated power converter from the AC system, a phase converter for converting the current sensed into an active current and a reactive current, a current control circuit receiving the active current and having a gain varying with one of deviation of the active current from an active current command value and the active current, and a modulation and phase control circuit generating control signals, based on the gain of said current control circuit, supplied to and controlling said self-commutated power converter, thereby suppressing an excessive increase in power flowing to said self-commutated power converter upon clearance a fault in the AC system.