Patent ID: 6407536
Filing Date: 2002-06-18
Classification: G05F,H02J,H02M,Y02E,Y10S

Abstract:
A control device for power conversion equipment comprising:a three phase/two phase transformer for transforming a three phase AC voltage into a two phase voltage, a positive-phase-sequence component extractor for extracting a positive-phase-sequence component from the two phase voltage, a negative-phase-sequence component extractor including first and second negative-phase-sequence component extraction filters for extracting a negative-phase-sequence component from the two phase voltage using the first negative-phase-sequence component extraction filter in a steady state, and for extracting a negative-phase-sequence component from the two phase voltage using the second negative-phase-sequence component extraction filter in a transient state, and a control signal generator for generating a control signal based on the positive-phase-sequence component extracted by the positive-phase-sequence component extractor and the negative-phase-sequence component extracted by the negative-phase-sequence component extractor.