Terminal voltage limit regulator for a load commutated inverter

Details Terminal voltage limit regulator for a load commutated inverter Terminal voltage limit regulator for a load commutated inverter

1981-11-19

1984-05-01

Smith, Jr., David

Electricity: motive power systems

Synchronous motor systems

Armature winding circuits

318812, H02P 540

Patent

active

044464142

ABSTRACT:
A control system for a load commutated inverter AC synchronous motor drive provides an operational shift in the event of an increase in motor terminal voltage V.sub.TERM above a preselected reference level. Under such an increase in terminal voltage, control is transferred from a condition where torque is controlled by current and the terminal voltage is uncontrolled to a condition where the load current, e.g., the DC link current I.sub.L flowing between a source side thyristor converter (AC to DC) 12 and a load side thyristor inverter (DC to AC) 14 is utilized to control the motor terminal voltage while the firing angle of the thyristor inverter 14 is used to control the motor torque. This involves increasing the minimum load or motor drive current for a desired torque while adjusting the inverter firing angle from a previous value, so that the desired torque is provided at a higher current I.sub.L and lower terminal voltage V.sub.TERM than before. Such an operational shift, in effect, uses a component of the load current to demagnetize the motor field in order to maintain the motor terminal voltage at an acceptable level.

REFERENCES:
patent: 3601674 (1971-08-01), Joslyn et al.
patent: 3819992 (1974-06-01), Opal et al.
patent: 4230979 (1980-10-01), Espelage et al.
patent: 4237531 (1980-12-01), Cutler et al.
patent: 4263557 (1981-04-01), Jarvinen
patent: 4276505 (1981-06-01), Bose

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