Alstom Technology Limited

General Electric Technology Gmbh

Alstom

Joerg Oesterheld

Thierry Lecomte

Thomas Baumann

Albrecht Bock

René Wilhelm Schaefer

Rene Wilhelm Schaefer

Alain Lacaze

Juergen Gerhard Hoffmann

Massimiliano Visintin

Giovanni Cataldi

Hongtao Li

Luca Alberti

Kevin Chan

Jürgen Hoffmann

The present disclosure relates to a system to compensate for mechanical forces on a rotating rotor of an electric machine, to a method for compensating mechanical forces on a rotating rotor of an electric machine, and to a use of a corresponding system. Disclosed is a system for compensating torsions at a rotating rotor. The system includes at least one measuring device for measuring specific properties of the rotor, an analyzer unit for analyzing the measurement data of the measuring device, a compensation means for compensating the torsions at the rotor, the compensation means comprise a power supply unit generating a signal adapted in amplitude and frequency to the measured properties of the rotor, and to apply the generated signal to the rotor, and the power supply unit is a frequency converter.

System for compensating rotor vibrations

The converter includes a plurality of input lines and one or more output lines. Each input line is connected to a group of supply circuits and the supply circuits of each group are connected to different output lines. The electric generator comprises a stator and a rotor. The stator has a plurality of windings. Each winding has a plurality of phases. Each phase comprises bars connected in series. The phases have a first connection at one end, a second connection at the other end and a third connection in an intermediate position between the first and the second connection.

Converter and electric generator in which groups of windings are used to generate output voltages according to a power requirement

The invention relates to a method for operating a thermal power plant, which includes a gas turbine and a generator driven directly by the gas turbine by means of a shaft and being connected to an electrical grid having a grid frequency (F) via an electronic decoupling apparatus and a step-up transformer. A synthetic inertia response is achieved by said method includes the steps of:

Method for operating a thermal power plant

A converter has converting groups with a first stage connected to input lines thereof and a second stage connected to output lines. The first and second stages have positive and negative branches that are connected together.

Converter

A method for the start of a power plant installation which includes a gas turbine, a generator coupled to the gas turbine, and a frequency converter to feed current into an electrical grid. In accordance with the method, during the start of the gas turbine, the generator is connected to the electrical grid via the frequency converter before the operating rotational speed of the gas turbine is reached, wherein the frequency converter is controlled such that it generates an output current with the grid frequency. A power plant installation can execute the above method.

Gas turbine start with frequency convertor

A method for operating a matrix converter in which m phases of a generator generating alternating voltage with n (n&#x3c;m) phases of a load are alternatingly connected via a multiple number of controllable bi-directional switches arranged in an (m&#xd7;n) matrix, wherein switching over from a selected connected phase of the generator to a selected non-connected phase of the generator takes place in a controlled sequence of commutation instants of the individual switches. While being able to use low commutation frequencies and correspondingly low commutation losses adapted, improved target voltage curves or target spectra of the generated alternating voltage can be obtained by (1) calculating the output spectrum of the matrix converter based on the connectivity of the phases, on the phase relationship between input and output, and on the instants when commutations of the switches are initiated and/or on the instants when commutations of the switches are completed, by (2) assessing the influence of individual commutations or groups of commutations based on calculated deviation output spectra for deviated individual commutations or groups of commutations, and by (3) amending the sequence of commutation instants to the target voltage curve or target spectrum using the information of these calculated deviation output spectra.

Method for improving the mode of operation of a matrix converter

A device for processing an electrically conductive component includes positioning means that position the component to be processed in a processing position. The positioning means are provided with means for generating a magnetic field. The magnetic field generates forces that act contactless on the component and in this way bring about or support the positioning of the component.

Device for processing an electrically conductive component

The invention relates to a method for applying the main insulation of conductor bars, in particular conductor bars for stator windings, whereby the conductor bars have a rectangular cross-section. The method comprises the following steps: insertion of a conductor bar with ends in an injection mold; centering of the conductor bar in the injection mold so that a void for holding an insulation material remains between the conductor bar and the injection mold; filling of the void with an elastomer in order to form the main insulation.

Growing community of inventors

Oberrohrdorf, Switzerland

Joerg Oesterheld