Maschinenfabrik Reinhausen Gmbh

Alexei Babizki

Haijun Feng

Dieter Dohnal

Karsten Viereck

Klaus Krueger

Klaus KRÜGER

A method of controlling a regulating transformer with a settable translation ratio, switchable between a first and second AC-mains includes the following operations: detecting phasor data of phasors of the first and/or second AC-mains; determining an equivalent circuit diagram with equivalent circuit diagram parameters for the first AC-mains; determining a load model with load model parameters for the second AC-mains; determining the equivalent circuit diagram parameters and the load model parameters from the phasor data; and when switching over to a desired translation ratio is to take place: predicting a working point of the second AC-mains for the desired translation ratio; checking a stability criterion in the second AC-mains for the predicted working point; and switching over to the desired translation ratio is carried out upon the stability criterion being fulfilled, but otherwise not switching over to the desired translation ratio.

Method for controlling a variable transformer and electrical system for coupling two AC networks

The invention relates to a device () and a method for controlling the stability of a local network (). The local network () comprises a plurality of outgoing circuits (,), each having at least one load () and/or at least one decentralized energy generation system (). Said device is provided with an on-load tap-changer () for adjusting an output voltage of the local network transformer (). The device is characterized in that a unit () for measuring current, connected to at least one of the plurality of outgoing circuits (,), and a unit () for measuring voltage, connected to a busbar () of the local network (), are arranged in a transformer housing ().

Method and apparatus for controlling stability of a local power grid

Disclosed is a device and method for reducing network feedback during operation of an electric-arc furnace (). The electric-arc furnace () has three lines () with one electrode () each. A sensor () for measuring the currently flowing current and a sensor () for measuring the currently applied voltage are provided in each line. A control and regulating unit () calculates an electrical actual value (E, E, E). A semiconductor tap changer () is assigned to the furnace transformer () such that, by suitably selecting three target winding taps (T, T, T) of a primary side (P) of the furnace transformer (), a target current (I, I, I) is adjustable in each line ().

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Wuppertal, Germany

Alexei Babizki