T-filter for reducing disturbances generated on a power grid...

Details T-filter for reducing disturbances generated on a power grid... T-filter for reducing disturbances generated on a power grid...

2007-07-17

2007-07-17

Riley, Shawn (Department: 2838)

Electrical transmission or interconnection systems

With harmonic filter or neutralizer

C323S209000

Reexamination Certificate

active

10490016

ABSTRACT:
An active filter (4) for compensation of variations in an apparatus' (3) current consumption from a power grid (1) as a cause of variations in the apparatus electrical load, through active frequency filtering and dynamic compensation of reactive energy/current. For each of the power grid's phases (a, b, c) the active filter includes a transistor bridge (Ta, Tb, Tc) connected between each phase and a DC-link (7). The active filter includes a filter circuit of LCL-type, arranged to reduce disturbances on the power grid caused by the active filter itself. The active filter further includes a control device (9) for calculating, with a given working frequency (f), points in time at which the transistor bridges are set to reverse the current direction through the DC-link, and the filter circuit is preferably adjusted to that working frequency.

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Simplified Modern Filter Design, Philiph Geffe, John F. Rider Publisher, Inc., New York, 1963, pp. 117, 130, 131 and 145.
“Active Filter Solutions For Utility Interface Of Industrial Loads”, Subhashish Bhattachara et al, Power Electronics Drives And Energy Systems For Industrial Growth, pp. 1078-1084, vol. 2, 1996.

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