Electric power conversion systems – Current conversion – Including an a.c.-d.c.-a.c. converter
Patent
1994-09-21
1997-02-11
Nguyen, Matthew V.
Electric power conversion systems
Current conversion
Including an a.c.-d.c.-a.c. converter
363 34, H02M 545
Patent
active
056027257
ABSTRACT:
A special purpose custom power control apparatus outputs AC power having or more particular characteristics relative to the AC power input thereto. Duty ratio of operation of GTO devices is controlled to transform the input power to the output power having its particular characteristics. In one embodiment duty ratio variation is used to provide a continuously variable transformation ratio from input to output. In another embodiment, duty ratio variation is used for controlling relative amounts of power drawn from different input buses, thus permitting isolation of faults and redirecting power flow. Another embodiment uses variation of GTO duty ratio to provide a continuously variable phase shift for each phase of a multi-phase distribution line. In another embodiment, duty ratio is modulated inversely to a voltage balance and a buck converter has a transfer ratio which is directly proportional to the duty ratio, to eliminate voltage unbalance on the multi-phase input AC. In still another embodiment, the duty ratio is modulated inversely to harmonics on the line, to increase and decrease magnitude of at least one phase inversely to the harmonics and to eliminate the harmonics.
REFERENCES:
patent: 4521671 (1985-06-01), Fronius
patent: 4697230 (1987-09-01), Neft
patent: 4894763 (1990-01-01), Ngo
patent: 4947308 (1990-08-01), Gulczynski
patent: 5017800 (1991-05-01), Divan
patent: 5099410 (1992-03-01), Divan
Nguyen Matthew V.
The Research and Development Institute at Montana State Universi
LandOfFree
Special purpose power control devices using 3-phase PWM converte does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Special purpose power control devices using 3-phase PWM converte, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Special purpose power control devices using 3-phase PWM converte will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-347090