Active filter unit

Details Active filter unit Active filter unit

1988-07-22

1989-05-30

Shoop, Jr., William M.

Electrical transmission or interconnection systems

With harmonic filter or neutralizer

307104, 307401, 363 37, 363 35, 323210, 323211, H02J 336, H02M 540

Patent

active

048354112

ABSTRACT:
An active filter unit comprising a first active filter which operates under low-frequency PWM control for controlling the fundamental and low-order harmonic capacity and a second active filter which operates under high-frequency PWM control for controlling the high-order harmonic capacity. The first and second active filters are connected in series through associated transformers that are in serial connection across the power lines. The divided filter arrangement reduces the required power rating of high-frequency switching devices.

REFERENCES:
patent: 4139723 (1979-02-01), Havas
patent: 4555659 (1985-11-01), Gyugyi
patent: 4561265 (1987-03-01), Stacey et al.
patent: 4692851 (1987-09-01), Attwood
Akagi et al., "Control Strategy of Active Power Filters Using Multiple Voltage-Source PWM Converters", IEEE Transactions on Industry Applications, vol. 1A-22, No. 3, pp. 460-465.

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