Electrical transmission or interconnection systems – With harmonic filter or neutralizer
Patent
1994-06-06
1997-03-25
Fleming, Fritz
Electrical transmission or interconnection systems
With harmonic filter or neutralizer
363 39, H02M 112, H02J 301
Patent
active
056147708
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.
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Article entitled: "Active Filter Device for Compensating Wide-Band Harmonics" by Kanematsu USA, Inc., Arlington Heights, IL, no date.
Fleming Fritz
Helionetics, Inc.
Hoffman E. Eric
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