Hybrid active power filter with programmed impedance characteris

Details Hybrid active power filter with programmed impedance characteris Hybrid active power filter with programmed impedance characteris

1997-05-29

1999-06-08

Berhane, Adolf Deneke

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

327552, 307105, H02M 112

Patent

active

059108894

ABSTRACT:
A hybrid active power filter having programmed impedance characteristics is presented. In accordance with which, a passive device comprising a capacitor C.sub.F is connected in series with an active device which are together connected in shunt with a power source and a load at transmission lines of a power system. Capacitor C.sub.F substantially supports the full-line voltage V.sub.H of the power source, whereby the active filter is exposed to a substantially lower voltage than the line voltage V.sub.H. The active device includes on active filter, i.e., an inverter current regulator with a programmable controller for executing a control algorithm. The controller of the active device receives signals corresponding to a voltage V.sub.M, at the low side of filter capacitor C.sub.F. Voltage V.sub.M is at a substantially lower voltage than the line voltage V.sub.H, whereby the cost of sensing voltage V.sub.M is significantly less than sensing the high line voltage V.sub.. The control algorithm of the present invention is expressed as ##EQU1## where I.sub.A is the current in the active device and Y.sub.FAo is an order transfer function of the effective admittance of the active device. Y.sub.FAo is a continuous function which is defined to provide a low impedance path at desired frequencies. Accordingly, the control algorithm controls the current I.sub.A in response to voltage V.sub.M sensed at the low side of filter capacitor C.sub.F as dictated by the programmed function. The active device may be connected to the passive filter at a junction between two capacitors or at a junction between two inductors.

REFERENCES:
patent: 3849677 (1974-11-01), Stacey et al.
patent: 5465203 (1995-11-01), Bhattacharya et al.
patent: 5567994 (1996-10-01), Davis et al.

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