Hybrid series active, parallel passive, power line conditioner f

Details Hybrid series active, parallel passive, power line conditioner f Hybrid series active, parallel passive, power line conditioner f

1994-11-15

1996-04-30

Nguyen, Matthew V.

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

363 39, 307105, H02M 112, H02J 102

Patent

active

055130909

ABSTRACT:
The apparatus includes an active filter, coupled in series, and a passive filter, coupled in parallel, to a power distribution network. The power distribution network includes a voltage source that induces input currents at a first end of the power distribution network. Nonlinear loads and other conditions on the power distribution network cause unbalanced power signals. The active filter controller of the invention uses synchronous transformations on the input currents to identify a negative sequence fundamental signal and a positive sequence fundamental signal, while filtering all harmonic components within the input currents. The negative sequence fundamental signal and the positive sequence fundamental signal are combined to form an active filter reference signal which is applied to the active filter. In response to the active filter reference signal, the active filter operates as a current controlled harmonic voltage source, carrying only the fundamental current, while only injecting harmonic voltages. Consequently, the active filter is operated as a harmonic isolator between the supply and load.

REFERENCES:
patent: 4651265 (1987-03-01), Stacey et al.
patent: 5198746 (1993-03-01), Gyugyi et al.
patent: 5351181 (1994-09-01), Brennen et al.
patent: 5355025 (1994-10-01), Moran et al.
patent: 5355295 (1994-10-01), Brennen
patent: 5359275 (1994-10-01), Edwards
patent: 5384696 (1995-01-01), Moran et al.
Bhattacharya, et al. Serial No. 08/079,303 filed Jun. 18, 1993.

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