Electrical transmission or interconnection systems – Miscellaneous systems – Rate of change responsive systems
Patent
1995-06-07
1997-03-04
Fleming, Fritz
Electrical transmission or interconnection systems
Miscellaneous systems
Rate of change responsive systems
307105, H02M 112
Patent
active
056082762
ABSTRACT:
An active current injection device is used to generate and inject fundamental and non-fundamental frequency current components onto an AC power line. A current pump control circuit receives an input signal which is representative of the line voltage of the power line. In response, the current pump control circuit generates a control signal which is used to generate a current component at the fundamental frequency which lags the line voltage by approximately 90 degrees. This fundamental frequency current component is transmitted through an impedance to the power line, thereby causing a voltage drop at the fundamental frequency across the impedance which is within a selected range about the line voltage. In one embodiment, this selected range is equal to approximately 25 to approximately 150 percent of the line voltage. Also, a damping control circuit receives an input signal which is representative of the line voltage of the power line. In response, the damping control circuit generates an output signal having a first component proportional to the line voltage and a second component proportional to the rate of change of the line voltage. This output signal is used to generate an electronic load current component which loads the non-fundamental frequency components of the line voltage. In addition, a four-wire adapter circuit allows an active current injection device to be operated from a four-conductor, three-phase AC power line using three transducers.
REFERENCES:
patent: 3531652 (1970-09-01), Aemmer et al.
patent: 3628057 (1971-12-01), Mueller
patent: 3825814 (1974-07-01), Pelly
patent: 4209757 (1980-06-01), Becker
patent: 4529925 (1985-07-01), Tanaka et al.
patent: 4680531 (1987-07-01), Rey et al.
patent: 4812669 (1989-03-01), Takeda et al.
patent: 4835411 (1989-05-01), Takeda
patent: 4906860 (1990-03-01), Asaeda
patent: 4967334 (1990-10-01), Cook et al.
patent: 5162983 (1992-11-01), Kumagai
patent: 5172009 (1992-12-01), Mohan
patent: 5198746 (1993-03-01), Gyugyi et al.
patent: 5345375 (1994-09-01), Mohan
Article entitled: "Active Filter Device for Compensating Wide-Band Harmonics" by Kanematsu USA, Inc., Arlington Heights, IL.
Fleming Fritz
Helionetics, Inc.
Hoffman E. Eric
LandOfFree
Structure and method for performing active injection mode filter does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Structure and method for performing active injection mode filter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Structure and method for performing active injection mode filter will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2148241