Reduction of disturbances in a power network

Details Reduction of disturbances in a power network Reduction of disturbances in a power network

1992-10-16

1994-03-22

Bertsch, Richard A.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

363 35, 363 51, H02M 702

Patent

active

052967646

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, in dependence on the control deviation (DU) from a desired value (Y2iR) of at least one state variable (Y2i) sensed in the power network (1), to generate a control signal (C1) which is supplied to the control input (41). The control member (8) is adapted to transform the control deviation (DU) in a filter device (93) with a transfer function (FI) which simulates the inverse of the transfer function (F1') from the control signal (C1) to the control deviation (DU) and/or to filter the output signal of the controller in a filter device (943, 953, 956) without any phase shift. (FIGS. 1 and 10)

REFERENCES:
patent: 3863134 (1975-01-01), Pollard
patent: 4639848 (1987-01-01), Sakai
IEEE Trans Pwr Delivery, vol. 4; No. 4; Oct. 1989; "Feasibility Study of AC-DC Side Active Filters for HVDC Converter Terminals"; Wong et al.
Control System Design-An Introduction to State-Space Methods, Friedland, pp. 78, 144 and 188; McGraw-Hill Book Company 1987.
Modern Control Systems; Fourth Ed.; Dorf; pp. 262-264; Addison-Wesley Publishing Company 1986.

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