High speed control of reactive power for voltage...

H - Electricity – 02 – J

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H02J 3/18 (2006.01) H02J 3/20 (2006.01) H02J 3/22 (2006.01) H02J 3/26 (2006.01)

Patent

CA 1069583

ABSTRACT OF THE DISCLOSURE In multiphase alternating current electrical power system subject to erratic and unbalanced reactive load current de- mand, reactive load current compensation is provided by a balanced multiphase reactive compensating impedance having equal but limited reactive current capability in all phases. To increase reative current capability of any one selected phase of the reactive compensator in response to severe load unbalance a supplementary single phase compensating impedance is connected through a load current controlled switching bridge in parallel circuit relation with any one phase arm of the multiphase compensator. When any one such parallel connection is operative the switching bridge is prevented from connecting the supplementary im- pedance in any other phase arm of the multiphase compensator.

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