Current limiter for a load commutated inverter

Details Current limiter for a load commutated inverter Current limiter for a load commutated inverter

1982-01-29

1984-01-24

Smith, Jr., David

Electricity: motive power systems

Synchronous motor systems

Armature winding circuits

318798, 318806, H02P 540

Patent

active

044279345

ABSTRACT:
A current limiter for a load commutated inverter-synchronous motor drive including a source side AC to DC converter (12) and a load side DC to AC converter (14) coupled via a DC link circuit including an inductor (16) wherein a torque reference signal (TORQUE REF) generated for controlling both the converters is limited in response to the peak value .psi..sub.MAX of the pseudo flux waveform (.psi..sub.ab, .psi..sub.bc, .psi..sub.ca) which is derived from the integral (.intg.) of the motor terminal voltage (v.sub.ab, v.sub.bc, v.sub.ca) in order to limit the motor stator current I.sub.s to a value corresponding to the region of peak output torque T.sub.MAX obtainable for the motor field current I.sub.f applied. Control of both the source side converter (12) and the load side converter (14) by the torque reference signal operates to control the magnitude of the current I.sub.L in a DC link circuit which corresponds to the motor stator current I.sub.s as well as the frequency of the AC power applied to the motor.

REFERENCES:
patent: 3601674 (1971-08-01), Joslyn
patent: 3851234 (1974-11-01), Hoffman
patent: 4230979 (1980-10-01), Espelage et al.
patent: 4263557 (1981-04-01), Jarvinen
patent: 4276505 (1981-06-01), Bose
patent: 4281276 (1981-07-01), Cutler et al.

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