Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1996-11-26
1998-04-07
Berhane, Adolf
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
327552, 307105, H02M 112
Patent
active
057371989
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 an 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.H. The control algorithm of the present invention is expressed as I.sub.A =Y.sub.FAo.sbsb.-- V.sub.M, 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.
REFERENCES:
patent: 3849677 (1974-11-01), Stacey et al.
patent: 5548165 (1996-08-01), Mohan et al.
patent: 5567994 (1996-10-01), Davis et al.
Hirofumi Akagi Dept. of Elect. Eng. Okayama University Okayama-city, 700 Japan New Trends in Active Filters for Improving Power Quality 10 pages 1995.
Delmerico Robert
Larsen Einar V.
Berhane Adolf
General Electric Company
Horton Carl B.
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