Electrical transmission or interconnection systems – With harmonic filter or neutralizer
Patent
1996-05-24
1998-03-10
Elms, Richard T.
Electrical transmission or interconnection systems
With harmonic filter or neutralizer
363 39, H02J 301
Patent
active
057265046
ABSTRACT:
An active power line conditioner that removes or cancels harmonic currents in power lines. The active power line conditioner is used with a power distribution system. The power distribution system includes an A/C source which supplies alternating half cycles (A/C) of voltage and current through a power line to an electrical load. An electrical load draws harmonic frequency current from the power line. The active power line conditioner comprises a current sensor, a first template circuit, a comparison circuit, and a current absorption and supply circuit. The current sensor is coupled to the power line and has an output comprising a sensed current signal representative of the current in the power line. The first template circuit has an output comprising a preferred current template that represents a desired sinusoidal current at the fundamental frequency of the power line and which is free of harmonic components. The comparison circuit is responsive to the preferred current template and the sensed current signal and has an output comprising a comparison signal that is indicative of whether the preferred current template is greater than or less than the sensed current signal. The current absorption and supply circuit is connected to the power line and alternates between supplying current to the power line and drawing current from the power line in response to the comparison signal to substantially cancel the harmonic frequency current in the power line.
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Emerson Ovel
Pecukonis Joseph P.
Elms Richard T.
Ley John R.
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