Line-to-line voltage reconstruction for synchronizing thyristor

Details Line-to-line voltage reconstruction for synchronizing thyristor Line-to-line voltage reconstruction for synchronizing thyristor

1981-09-08

1983-08-16

Beha, Jr., William H.

Electricity: motive power systems

Induction motor systems

Primary circuit control

363 37, 363 87, 363 96, 363129, H02P 762

Patent

active

043993958

ABSTRACT:
The effect of commutation notches 35 appearing in the nominally sinusoidal alternating current (AC) line-to-line voltage, for example, v.sub.ab used to synchronize the firing of thyristors in three phase, phase-locked power converters 12 and 14 is essentially eliminated by reconstructing the corrupted line-to-line voltage by summing the integral of the corrupted line-to-line voltage .PSI..sub.ab with a signal proportional to the product of the delta load current, for example, i.sub.ab and the commutation inductance L.sub.c. The composite waveform .PSI..sub.ab +i.sub.ab .times.L.sub.c) resulting from the summation has well defined zero crossings 41 from which synchronizing pulses are generated for synchronizing the phase-locked thyristor firing circuit 18 implemented by either software or hardware techniques. Additionally, the reconstructed waveform is used to control commutation, particularly in the control of a load side converter i.e. inverter 14 which is utilized in an AC motor drive system.

REFERENCES:
patent: 3648148 (1972-03-01), Bechet et al.
patent: 4050007 (1977-09-01), Gross
patent: 4272814 (1981-06-01), Nakrokhin et al.
patent: 4347562 (1982-08-01), Galloway
IEEE Transactions on Industrial Electronics and Control Instrumentation, vol. IECI-26, No. 3, pp. 185-191, Aug. 1979.

Affiliated with

Also associated with

Rating

Line-to-line voltage reconstruction for synchronizing thyristor does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Line-to-line voltage reconstruction for synchronizing thyristor , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Line-to-line voltage reconstruction for synchronizing thyristor will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-816705