Apparatus for compensating reactive power by current-source type

Details Apparatus for compensating reactive power by current-source type Apparatus for compensating reactive power by current-source type

1987-09-25

1988-10-25

Salce, Patrick R.

Electricity: power supply or regulation systems

For reactive power control

Using converter

323205, G05F 170

Patent

active

047806605

ABSTRACT:
A first apparatus for determining instantaneous reactive currents to determine instantaneous reactive currents in every phase of a three-phase load. Three phase current signals corresponding, respectively, to phase currents of the three-phase load supplied from a three-phase power-supply source are multiplied with sinusoidal wave signals of three phases, each of which has a phase difference of 90.degree. relative to the corresponding phase voltage of the three-phase power supply source to obtain the products for three phase, respectively, which products are added together to produce a sum signal. The instantaneous reactive currents mentioned above are determined on the basis of the sum signal and the three phase sinusoidal wave signals. A second apparatus for compensating the reactive power of the three-phase load by means of a converter load circuit including a current-source type three phase converter connected in parallel with the three-phase load by making use of the instantaneous reactive currents of the three-phase load determined by the first mentioned apparatus.

REFERENCES:
patent: 3829759 (1974-08-01), Thorborg
patent: 3900792 (1975-08-01), Moltgen
patent: 3968422 (1976-07-01), Waldmann
patent: 4600874 (1986-07-01), Tupper et al.
"General Analysis of Instantaneous Reactive Power and Application"; Periodical of the I.E.E. of Japan; vol. 103, No. 7, pp. 483-490.
"Operation Analysis and Designing of . . . Voltage-Source Type PWM Converter"; Periodical of the I.E.E. of Japan; vol. B106, No. 4, pp. 323-330.

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