US 6,407,536 B1 · Power conversion equipment and control device for the power conversion equipment

Abstract

A power conversion equipment capable of dealing with an imbalance fault by changing characteristics of a filter for extracting negative-phase-sequence voltage in a steady state and at the time of a system fault, and a control device for the conversion equipment. The control device for power conversion equipments includes a negative-phase-sequence component extractor including first and second negative-phase-sequence component extraction filters having different extracting capabilities, and 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 extracting a negative-phase-sequence component from the two phase voltage using the second negative-phase-sequence component extraction filter in a transient state. In the negative-phase-sequence component extractor, a negative-phase-sequence component is extracted by the different negative-phase-sequence component extraction filters in the steady state and in the transient state, so that approprate control can be provided.

Claims16

Dependent claims

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.

1 more element

A power conversion equipment comprising:

an AC voltage system,
a transformer for transforming a system voltage of the AC voltage system,
a converter for converting into a DC voltage the AC voltage transformed by the transformer,
a DC condenser connected to the converter,
an AC voltage sensor for detecting the system voltage,
a three phase/two phase transformer for transforming into a two phase voltage the three phase AC voltage of the AC voltage system detected by the AC voltage sensor,
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.

6 more elements

Dependencies are inferred from the claim text.

Power conversion equipment and control device for the power conversion equipment

Life of this patent

Power conversion equipment and control device for the power conversion equipment

Life of this patent

Abstract

Claims16