Reduction of disturbances in a power network
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Abstract
A method and a device in an electric power network (1), comprising an active filter (4) controllable via a control input (41), for reducing disturbances generated by a disturbance source (6) located in and/or connected to the power network. A control member (8) is adapted, based on at least one first state variable (Y1i) sensed in the power network (1) and a model of the power network (1), to calculate the disturbances (X2) which occur in a second section (B--B) in the power network (1) without action from the active filter (4), to calculate a control signal (C1) such that, supplied to the control input (41), it would generate in the second section (B--B) the calculated disturbances (X2) with reversed polarity, and to generate the control signal (C1) and supply this to the control input (41). By sensing, in addition, at least one second state variable (Y2i) in the second section (B--B), the control signal (C1) can also be generated in dependence on the control deviation (DU) of the second state variable (Y2i) from a desired value (Y2R). (FIGS. 1 and 2A)
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Current AssigneeAsea Brown Boveri AB (ABB Limited)
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Original AssigneeAsea Brown Boveri AB (ABB Limited)
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InventorsAberg, Anders, Asplund, Gunnar, Breder, Henrik
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Primary Examiner(s)Harvey, Jack B.
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Assistant Examiner(s)MILLER, CRAIG S
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Application NumberUS07/961,638Time in Patent Office613 DaysField of Search364/492, 364/495, 364/483, 364/574, 364/572, 364/802, 364/578, 364/579, 364/580, 323/205US Class Current700/292CPC Class CodesH02J 3/01 Arrangements for reducing h...Y02E 40/40 Arrangements for reducing h...Y10S 174/17 in an electric power conver...Y10S 174/18 in a power distribution net...
