Method and a device for controlling a secondary voltage in a transformer device connected to a power network and comprising an on-load tap-changer
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United States of America Patent
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-
Nov 6, 2001
Grant Date -
N/A
app pub date -
Aug 16, 2000
filing date -
Jan 21, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a method for controlling a secondary voltage (US) in a transformer device connected to a power network with a given system frequency (f.sub.1), which transformer device comprises a tap-changer (TC) which, in dependence on a supplied control signal (RCS), influences the voltage ratio (RAT) of the transformer device, a voltage variable (u.sub.E) is formed in dependence on the secondary voltage. The voltage variable comprises at least one first control component (u.sub.1, .phi..sub.1) which represents a fundamental component of the secondary voltage, and a control quantity (EPV, EEV) is formed in dependence on the voltage variable. The control signal is formed in dependence on a deviation (DPV, DEV) between the control quantity and a given reference value (PVR, EVR) therefor and is supplied to the tap-changer. The actual fundamental frequency (f.sub.1 *) of the power network is continuously sensed and the voltage variable is formed in dependence thereon.
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