Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1997-03-31
1999-11-30
Wong, Peter S.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
363149, 323217, 323243, H02M 112, H02M 500, G05F 100, G05F 110
Patent
active
059953918
ABSTRACT:
A control arrangement for a multilevel convertor employs an AC reference signal which is locked to the AC system frequency and is compared with a number of DC threshold levels. Intersections of the reference signal and threshold levels triggers the firing and turning-off of GTOs within the convertor to produce the desired multilevel voltage output. Normal changes in system voltage, for example, are compensated by variation of the phase relationship of the reference signal with respect to the system voltage, and/or of the voltage values of the threshold levels. Sudden and drastic changes, especially reductions, in system voltage level are sensed and used to alter the amplitude of the reference signal so as to reduce the difference between the convertor multilevel voltage and the system voltage, thereby reducing the stress on the GTOs during faults.
REFERENCES:
patent: 3990000 (1976-11-01), Digneffe
patent: 4307331 (1981-12-01), Gyugyi
patent: 4382223 (1983-05-01), Hedges
patent: 4426614 (1984-01-01), Nola
patent: 4499534 (1985-02-01), Schnetzka
patent: 4580080 (1986-04-01), Smith
patent: 4580088 (1986-04-01), Bloomer
patent: 4689548 (1987-08-01), Mechlenberg
patent: 4956762 (1990-09-01), Loveness et al.
patent: 5532575 (1996-07-01), Ainsworth et al.
patent: 5828561 (1998-10-01), Lavieville et al.
Abbott Keith
Davies Mark
Fitz Philip J
GEC Alsthom Limited
Vu Bao Q.
Wong Peter S.
LandOfFree
Control arrangement for a multilevel convertor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Control arrangement for a multilevel convertor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Control arrangement for a multilevel convertor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1681518