Inverter control unit

Details Inverter control unit Inverter control unit

1998-06-01

1999-12-07

Riley, Shawn

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

H02M 324

Patent

active

059994304

ABSTRACT:
An inverter control unit includes a variable-tap-added step-down transformer. A DC energy unit is connected to a DC side of an inverter unit for supplying or consuming effective power. A control circuit controls a variable tap of the variable-tap-added step-down transformer. The control circuit includes a calculating circuit for calculating an effective value of a system voltage. A setting circuit sets an effective value command value. A deviation calculating circuit calculates a deviation between the effective value and the effective value command value. A tap command circuit operated by the system voltage outputs a tap command value corresponding to the deviation. A tap change judging circuit determines whether an inverter current at least equal to a rated value is output with a change in the variable tap. A tap command circuit changes the tap command value on the basis of the determination of the tap change judging circuit. A tap command value selecting circuit selects any one of the two tap command values. A tap changing circuit changes the variable tap on the basis of the tap command value selected by the tap command value selecting circuit.

REFERENCES:
patent: 4323838 (1982-04-01), Pettigrew
patent: 5428551 (1995-06-01), Trainor et al.
patent: 5619121 (1997-04-01), Trainor
patent: 5701239 (1997-12-01), Bjorklund et al.
patent: 5821716 (1998-10-01), Okanik

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