Abstract: 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.

Abstract: 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.

Abstract: The present disclosure relates to a generator control device and a method to control the output power of at least one generator connected to an electric grid. It is an object of the invention to provide a fast solution to counteract electric grid frequency instabilities. Disclosed is a generator control device and method to control the output power of at least one turbogenerator driven by a turbine connected to an electric grid with a static frequency converter. The generator control device includes a frequency measuring device to measure the electric grid frequency fel, and the static frequency converter is configured to operate the turbogenerator in dependency of the measured electric grid frequency fel.

Abstract: 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 (FG) via an electronic decoupling apparatus and a step-up transformer. A synthetic inertia response is achieved by said method includes the steps of: sensing said grid frequency (FG); detecting if in case of an excursion of said grid frequency (FG) additional inertial power is required or not; if inertial power is required, calculating the magnitude and duration of the additional inertial power; and releasing additional inertial power to said electrical grid in accordance with said calculations via said electronic decoupling apparatus.

Abstract: 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 analyser unit for analysing 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.

Abstract: 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.

Abstract: 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.

Abstract: 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 (FG) via an electronic decoupling apparatus and a step-up transformer. A synthetic inertia response is achieved by said method includes the steps of: sensing said grid frequency (FG); detecting if in case of an excursion of said grid frequency (FG) additional inertial power is required or not; if inertial power is required, calculating the magnitude and duration of the additional inertial power; and releasing additional inertial power to said electrical grid in accordance with said calculations via said electronic decoupling apparatus.

Abstract: The invention relates to a method for the start of a power plant installation (10), which comprises a gas turbine (2), a generator (18) coupled to the gas turbine (2), and a frequency converter (27) to feed current into an electrical grid (1). In accordance with the method, during the start of the gas turbine (2), the generator (18) is connected to the electrical grid (1) via the frequency converter (27) before the operating rotational speed of the gas turbine (2) is reached, wherein the frequency converter (27) is controlled such that it generates an output current with the grid frequency. The invention further relates to a power plant installation (10) for the execution of such a method.

Abstract: A method for operating a matrix converter in which m phases of a generator generating alternating voltage with n (n<m) phases of a load are alternatingly connected via a multiple number of controllable bi-directional switches arranged in an (m×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.

Abstract: A method for operating a matrix converter in which m phases of a generator generating alternating voltage with n (n<m) phases of a load are alternatingly connected via a multiple number of controllable bi-directional switches arranged in an (m×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.

Abstract: A process for producing insulations for electrical conductors by powder coating, which results in aging which is improved compared to glass-mica or casting-resin insulation, and a powder which is suitable for such a process. The powder is applied a number of times in succession, in the form of individual layers which follow one another, until a layer thickness of ?10 mm is reached, and each of the individual layers undergoes intermediate heat curing before the next individual layer is applied. The intermediate curing of each individual layer uses a curing time which corresponds to 2-10 times the gel time of the powder used. Finally, the entire insulation undergoes final curing. The result of an electrical life test carried out on various specimens insulated with epoxy-resin powder which contains fine filler.

Abstract: The present invention relates to a reinforced, pressure-resistant flexible tube for mechanical end-winding support for rotating electrical machines. The flexible tube according to the invention in this case comprises a glass fiber bundle which is encased by an inner glass cloth flexible tube. This glass cloth flexible tube is in turn externally coated with a polymer layer and is for its part surrounded by an outer glass cloth flexible tube. A matrix polymer is introduced into the inner glass cloth flexible tube and, after it has cured, the reinforced, pressure-resistant flexible tube can carry out its supporting and spacing function fully.

Abstract: 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.

Abstract: The invention relates to devices (50, 100) and a method for the coating of conductor lines, in particular for the insulation of stator windings of rotating electrical machines. According to the invention, an extruder head (50) is provided for use in a device for the coating of a conductor or a conductor line (72), having at least one extruder die (56), which is connected on one side to a supply conduit (58) for feeding the coating material. On the other side, the extruder die (56) opens out into into a region to which the conductor that is to be coated or the conductor line that is to be coated is adjacent during operation. Furthermore, the outlet of the extruder die (56) can be closed by means of a seal (57).

Abstract: The invention relates to a method for application of the main insulation to conductor bars, in particular conductor bars for stator windings, with the conductor bars having a rectangular cross section. The method comprises the following steps: connection of the individual conductor bars to form a quasi-infinite conductor bar with a rectangular cross section; sheathing of the quasi-infinite, rectangular conductor bar with main insulation; cutting out or detaching of the unusable connecting points.

Abstract: 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.

Abstract: 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.

Abstract: A winding bar (10) for a high-voltage winding, for example a stator winding of an electric machine, includes a plurality of conductors (13) which are arranged above and/or next to one another in a conductor bundle. The conductor bundle has a rectangular cross section. The conductor bundle is surrounded by an insulation (14). An overall improved electric strength is achieved at the edges without changing the insulation thickness because a thickness (d2) of the insulation (14) on the edges (15) of the winding bar (10) is greater than the thickness (31) of the insulation (14) on the flat sides of the winding bar (10). Preferably, a calibration process is used to shape the edge region.

Abstract: The present invention relates to a reinforced, pressure-resistant flexible tube for mechanical end-winding support for rotating electrical machines. The flexible tube according to the invention in this case comprises a glass fiber bundle which is encased by an inner glass cloth flexible tube. This glass cloth flexible tube is in turn externally coated with a polymer layer and is for its part surrounded by an outer glass cloth flexible tube. A matrix polymer is introduced into the inner glass cloth flexible tube and, after it has cured, the reinforced, pressure-resistant flexible tube can carry out its supporting and spacing function fully.