Static VAR generator having reduced harmonics

Details Static VAR generator having reduced harmonics Static VAR generator having reduced harmonics

1983-12-21

1985-12-24

Wong, Peter S.

Electricity: power supply or regulation systems

For reactive power control

Using impedance

323255, G05F 170

Patent

active

045609179

ABSTRACT:
There is provided a static VAR generator employing a bank of series-connected inductors, each inductor being supplied by different secondary taps of a step-down transformer. The voltage rating of each inductor is appropriately decreased so as to make their sum correspond to the supply voltage. All but one of the inductors are controlled by thyristors in an on-off fashion to supply reactive power to the network in incremental steps. One of the thyristors is continuously phase-angle fired in combination with the incremental insertion of the other inductors to vary the VAR output over the full range, but generating harmonics that are proportional only to the continuously controlled inductor.

REFERENCES:
patent: 3999117 (1976-12-01), Gyugyi et al.
patent: 4104576 (1976-11-01), Frank
patent: 4220911 (1978-09-01), Rosa
patent: 4503380 (1985-03-01), Thanawala

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