| 摘要 |
The invention relates to a generator system having a three-phase generator, inside of which a generator winding (primary winding, stator) is directly coupled to the mains, and at least one second generator winding (secondary winding, rotor) can be accessed from the outside (e.g. dual-supplied asynchronous machine, cascade machine). Systems of this type are frequently used in regenerative power plants such as wind power stations and water power stations. The aim of the invention is to ensure, with an economically justifiable expense, that the generator system, in the event of sudden changes in the mains voltage, supplies power into the mains continuously or with only an insignificant interruption and can continue its supplying operation under defined conditions in the shortest amount of time after the change in voltage, independent of the rate of the change in voltage. According to the invention, the generator system contains a mains safety switch (2), a generator (4) with a stator winding (4.1) and with a rotor winding (4.2), a frequency converter (7) with an intermediate circuit (7.3), a power choke (9), a regulating unit (10), an electronic switch (3) situated between the stator connections of the generator and the network safety switch together with a unit for the instantaneous tripping (11) of this switch, and contains a unit for the rapid demagnetization (12) of the generator situated parallel to the stator connections or rotor connections. After the detection of a mains voltage change of a corresponding amplitude, an instantaneous tripping (11) of the electronic switch (3) ensues while the rapid demagnetization unit (12) is simultaneously activated. This, along with a defined control of the rotor voltage are used to set the stator flux in a minimum amount of time to a value corresponding to the actual mains voltage so that value coincidence and phase coincidence exist between the induced stator voltage and mains voltage before the electronic switch (3) is switched on again in order to continue the supplying operation. |
