Patent ID: 6670793
Filing Date: 2003-12-30
Classification: H02J,Y02E

Abstract:
A dynamic series voltage compensator for compensating voltage dips in an alternating current electric power system providing at least one supply voltage, each of said at least one supply voltage being at a respective phase, said dynamic series voltage compensator including:means for independently monitoring each of said at least one supply voltage; means for generating digital signals indicative of voltage magnitude of said each of said at least one supply voltage over a present voltage cycle period; means for comparing said digital signals with stored data indicative of voltage magnitude of said each of said at least one supply voltage over a preceding voltage cycle period; means for determining difference between said digital signals and said stored data at corresponding time periods within said present and preceding voltage cycle periods; and means for controlling, when said difference exceeds a predetermined value for a corresponding time period, at least one series injection inverter to inject a compensation voltage directly to a respective conductor on which said each of said at least one supply voltage is supplied, said compensation voltage having a magnitude to compensate said each of said at least one supply voltage to a voltage magnitude of said preceding voltage cycle period immediately before a voltage dip at said corresponding time period.