Harmonic suppressing device

Details Harmonic suppressing device Harmonic suppressing device

1987-06-25

1989-03-14

Shoop, Jr., William M.

Electrical transmission or interconnection systems

With harmonic filter or neutralizer

307 11, 363 98, 363132, 363161, 323207, 323210, H02P 1330, H02J 318

Patent

active

048126691

ABSTRACT:
A harmonic suppressing device provided in a power system such as, for example, a transmission and distribution system or a power generating system, to filter higher harmonic currents generated by a higher harmonic current source of the power system such as, for example, a cycloconverter. The harmonic suppressing device comprises, as the principal components thereof, a passive filter serving as a high-order higher harmonic filtering unit for filtering higher harmonic currents of comparatively high order among those generated by the higher harmonic current source, and an active filter serving as low-order higher harmonic filtering unit for filtering higher harmonic currents of comparatively low orders among those generated by the higher harmonic current source. The active filter comprises: a main active filtering circuit comprising a plurality of switching transistors, rectifying diodes combined with the switching transistors, respectively, a capacitor, and a reactor; an operating circuit which calculates controlling data for controlling the commutating action of the main active filtering circuit on the basis of the detected values of the higher harmonic currents that flows into the power source side of the power system and the detected values of the output voltage of the higher harmonic current source; and a control circuit which gives control signals such as, for example, pulse width modulating signals to the main active filtering circuit. The harmonic suppressing device is capable of filtering higher harmonic currents in a wide frequency band.

REFERENCES:
patent: 3900792 (1975-08-01), Moltgen
patent: 3963978 (1976-06-01), Kelley et al.
patent: 3992661 (1976-11-01), Kelley
patent: 4418380 (1983-11-01), Tanaka et al.
patent: 4615000 (1986-09-01), Fujii et al.
patent: 4673823 (1987-06-01), Tanaka
patent: 4677539 (1987-06-01), Erickson et al.
The Showa 61st, National Convention of Institute of Electrical Engineers of Japan, "One of Studies in Connection with Cyclo-Converter Higher Harmonic Accommodation Characteristic with Active Filter", 1986, p. 660.
Kobayashi et al., Meiden GIHO Technical Report, vol. 184, No. 5, "New Active Harmonic Suppressor Application", 1985, pp. 20-23.
Akagi et al., IEEE Transactions on Industry Applications, vol. 1A-22, No. 3, "Control Strategy of Active Power Filters Using Multiple Voltage-Source PWM Converters", May/Jun. 1986, pp. 460-465.

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