US 5,182,463 A · 3-Phase converter apparatus

Abstract

A 3-phase converter apparatus, in which a 3-phase A.C. power supply and a 3-phase converter operate in parallel on a common load BUS so as to share the load power, has an output voltage command generating device for generating an instantaneous command of the output voltage from the converter, and instantaneous voltage control device for controlling the converter so as to reduce the deviation of the instantaneous value of the output voltage of the converter from the instantaneous command generated by the output voltage command generating device. The converter includes at least one semiconductor switch for effecting a plurality of switching cycles in a half cycle of the A.C. power, so that the control of the phase of the output voltage of the converter with respect to the A.C. power supply is started at any moment.

Claims15

Dependent claims

A 3-phase converter apparatus in which a 3-phase A.C. power supply and a 3-phase converter operate in parallel on a common load BUS so as to share load power, said apparatus comprising:

output voltage command generating means for generating an output voltage command of output voltage from the converter, said means computing an optimum phase deviation of a load BUS voltage from the A.C. power supply and determining the output voltage command in accordance with a computed value of the optimum phase deviation;
and
instantaneous voltage control means for controlling the converter so as to reduce deviation of the instantaneous value of the output voltage of the converter from the output voltage command generated by said output voltage command generating means.

A 3-phase converter apparatus in which a 3-phase A.C. power supply and a 3-phase converter operate in parallel on a common load BUS so as to share load power, said apparatus comprising:

output voltage command generating means for generating an output voltage command from the converter by conducting a coordinate conversion so as to convert 3-phase A.C. power into two independent components, forming a signal by multiplying at least one of the components with a transfer function having a resistance component in a power supply frequency region, and subtracting the signal from a preset coordinate system voltage command after coordinate conversion;
and
instantaneous voltage control means for controlling the converter so as to reduce deviation of the instantaneous value of the output voltage of the converter from the output voltage command generated by said output voltage command generating means;
wherein said means for generating an output voltage command computes an optimum phase deviation of a load BUS voltage from the A.C. power supply and determines the output voltage command in accordance with the computed optimum phase deviation.

1 more element

Dependencies are inferred from the claim text.

3-Phase converter apparatus

Life of this patent

3-Phase converter apparatus

Life of this patent

Abstract

Claims15