Cross-tied current regulator for load commutated inverter drives

Details Cross-tied current regulator for load commutated inverter drives Cross-tied current regulator for load commutated inverter drives

1981-12-23

1983-12-13

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318809, 318723, H02P 540

Patent

active

044207190

ABSTRACT:
A control system for an AC motor drive including a source side converter and a load side converter coupled together by means of a DC link circuit wherein the current in the DC link circuit is controlled by either the source side converter or load side converter depending upon which converter is capable of control. This is achieved by crosstieing a signal from the normal regulating path in the source side converter control to the alternate regulating path in the load side converter control. This signal is chosen to be indicative of the source side converter controller being unable to control current, and may be derived from current error. This signal operates to alter the firing angle of the load side thyristor bridge to regulate the DC link current in the event the source side converter is unable to maintain the required current regulation.

REFERENCES:
patent: 3372323 (1968-03-01), Guxeska
patent: 3769564 (1973-10-01), Rettig
patent: 4230979 (1980-10-01), Espelage et al.
patent: 4276505 (1981-06-01), Bose
Maag, R. B., "Characteristics and Application of Current Source/Slip Regulated AC Induction Motor Drives", IEEE-IGA Annual Meeting, Cleveland, Ohio, Oct. 18-21, 1971, pp. 1-6.
Phillips, K. P., "Current Source Convertor for AC Motor Drives", IEEE Conference Record, IEEE-IGA Annual Meeting, Cleveland, Ohio, Oct. 18-Oct. 21, 1971, pp. 385-391.
"Utilization and Rating of Machine Commutated Inverter-Synchronous Motor Drives", by J. Rosa, IEEE-IAS Conference Record, 1978, pp. 453-462.

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