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Method and device for operating a synchronous machine

A technology of synchronous machine and voltage, which is applied to the starter of a single synchronous machine, AC motor control, motor generator/starter, etc., and can solve problems such as failure to start

Active Publication Date: 2017-03-29
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It may therefore not be possible to start, i.e. start, such motors directly at the grid

Method used

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  • Method and device for operating a synchronous machine
  • Method and device for operating a synchronous machine
  • Method and device for operating a synchronous machine

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Embodiment Construction

[0028] exist figure 1 In , the AC synchronous machine is connected to phases A, B, C of the three-phase grid via a three-phase power controller 4 . Each phase A, B, C is associated with a semiconductor regulator 6, 7, 8 consisting of two anti-parallel thyristors A1, A2, B1, B2, C1, C2. The ignition electrodes of the thyristors A1 , A2 , B1 , B2 , C1 , C2 are connected to a control device 3 , by means of which the ignition signals required for igniting the thyristors A1 , A2 , B1 , B2 , C1 , C2 are supplied. The control device 3 is realized by a microcontroller. Between two phases A, B, C of the grid, e.g. figure 1 A voltage measuring device 5 is connected between the terminals A and B of the power grid in AB . For the other two phases there can likewise be additional voltage measuring devices, not shown.

[0029] In one embodiment variant, the control device 3 and the alternating current regulator 3 are realized as separate units from the alternating current synchronous m...

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Abstract

The invention relates to a method for operating a synchronous machine (1) by means of a three-phase power controller (4) comprising three semiconductor controllers (6, 7, 8), which is connected to a three-phase power grid. , the method has the following steps: - Determine the phase difference between the pole wheel voltage of the synchronous machine (1) and the grid voltage of the three-phase grid, - Determine the number of revolutions of the rotor of the synchronous machine, - Determine the phase of the three-phase grid, - Determining at least a portion of the stator current of the synchronous machine (1) based on a precalculation taking into account current values ​​of phase differences, rotational speeds, stator currents and phases when switching on at least two semiconductor controllers (6, 7, 8) The torque curve determines a decisive characteristic factor, on the basis of which at least one switching time point is determined, wherein at least two semiconductor controllers (6, 7, 8) are switched on at the switching time point.

Description

technical field [0001] The invention relates to a method for operating a synchronous electric machine and an associated device for operating a synchronous electric machine with a three-phase power controller, an alternating current controller which can be connected to a three-phase power grid and which comprises a semiconductor controller, for example an anti-parallel thyristor. In this case, in particular, the starting of synchronous machines is involved. Background technique [0002] AC synchronous motors without a starter cage are in principle linked to the frequency of the fed three-phase grid. It may therefore not be possible to start, ie start, such electric machines directly at the grid. More precisely, between the three-phase grid and the synchronous machines a device is required which first enables starting. For this purpose, frequency converters are usually used. The frequency converter consists of a rectifier, an intermediate circuit (-capacitor) and an invert...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P27/18H02P1/46H02P25/024
CPCH02P27/18H02P25/024H02P1/46
Inventor 马塞尔·贝内克
Owner SIEMENS AG