EP2992601A1 - System aus einer turbine und einer damit mechanisch gekoppelten elektromaschine und verfahren zum betrieb eines solchen systems - Google Patents
System aus einer turbine und einer damit mechanisch gekoppelten elektromaschine und verfahren zum betrieb eines solchen systemsInfo
- Publication number
- EP2992601A1 EP2992601A1 EP14741556.6A EP14741556A EP2992601A1 EP 2992601 A1 EP2992601 A1 EP 2992601A1 EP 14741556 A EP14741556 A EP 14741556A EP 2992601 A1 EP2992601 A1 EP 2992601A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electric machine
- turbine
- torque
- electrical energy
- switching device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
- H02P3/06—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter
- H02P3/18—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an ac motor
- H02P3/24—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an ac motor by applying dc to the motor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D19/00—Starting of machines or engines; Regulating, controlling, or safety means in connection therewith
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/08—Control of generator circuit during starting or stopping of driving means, e.g. for initiating excitation
Definitions
- the present invention relates to a system comprising a turbine, in particular a steam turbine, and an electric machine mechanically coupled thereto, and a method for operating such a system.
- the total enthalpy of process steam in particular steam, is used to drive a work machine mechanically coupled to the steam turbine, for example a generator.
- a work machine mechanically coupled to the steam turbine
- electrical energy is generated, which can be fed into a network connected to this.
- heated process steam is introduced into the steam turbine, which then flows through a flow channel formed between a housing and a rotor of the steam turbine and as a rule overcomes several so-called turbine stages.
- Each of the turbine stages is thereby formed by a set of blades of the rotor and a set of vanes of the housing.
- the process steam is i.d.R. discharged after flowing through the stages of the steam turbine and fed to a condenser, where it condenses.
- Such capacitors are regularly equipped with so-called vacuum breakers, which break the low pressure prevailing in the condenser, i. an increase in the local
- the present invention seeks to provide a way to brake a system of a turbine, in particular steam turbine, and a generator coupled thereto in the simplest possible way.
- a faster leakage of the system is achieved after a shutdown and / or accidental restart at standstill of the system can be avoided.
- a generic system comprising a turbine, in particular a steam turbine, and an electric machine mechanically coupled therewith, in which the electric machine generates electrical energy in an operating direction of rotation when driven by the turbine (and thus operates as a generator), which then via a first Switching device located switching device can be fed into an electrical network, and in which the switching device can be brought into a second switching position, is accordingly further developed according to the invention that the electric machine in the second switching position of the switching device electrical energy is supplied such that it generates a defined torque (and thus works as an electric motor). If in this case the generated torque is opposite to the operating direction of rotation, the rotating system is braked by the action of the electric machine.
- a method according to the invention for operating a system from a turbine, in particular a steam turbine, and an electric machine mechanically coupled thereto, wherein the electric machine can feed electrical energy into an electrical network in a drive direction through the turbine in a direction of operation, is characterized accordingly in that the electric machine is subjected to electrical energy for accelerating or decelerating in such a way that it generates a torque.
- slowing down is meant both reducing the speed of the system during rotation in the operating direction of rotation, particularly during coasting after system shutdown, and decreasing the speed of the system when rotating contrary to the operating direction of rotation, as well as detaining the non-rotating one
- the electrical machine provided for operation as an electric motor can be supplied to the electric machine from any network, in particular an AC network.
- the network in which the system feeds electrical energy in normal operation to provide the required for generating the torque by the electric machine electrical energy.
- the network from which the electric machine is supplied with electrical energy for operation as an electric motor is operated with a specifically designed alternating current and in particular three-phase alternating current and accordingly the system also supplies appropriately trained alternating current via the switching device to the grid during operation, it can be provided that this concretely formed exchange Ström is rectified by means of a controlled inverter such that it causes the generation of the braking torque in the electric machine.
- the electric machine In the second switching position of the switching device, the electric machine would thus be connected via such an inverter to the electrical network or at least always connected when a braking of the system is actually provided. About this inverter, the system is then supplied to the system for braking a brake AC power.
- the electric machine can be connected by means of the switching device in the second switching position with a DC voltage source.
- a DC voltage source can be any DC voltage source and in particular a DC voltage network, which can be operated, for example, in addition to the mains, into which the system feeds electrical energy during operation, in particular in the form of (three-phase) alternating current.
- DC voltage source but also comes a combination of
- the electric machine is connected in the second switching position via the rectifier to the network. Since the height of the torque generated by the electric machine is preferably adjustable, it may be provided to design the inverter or rectifier in such a way that by means of this control of the height of the current supplied via the switching device of the electric machine can be regulated.
- the inverter or rectifier receives the information about the current rotational speed of the rotor via a sensor on the rotor.
- the system according to the invention can still be connected to the atmosphere via a valve in order to ventilate the turbine as required by increasing the pressure.
- the pressure increase can be carried out particularly preferably also in a downstream of the steam turbine condenser, which may be provided that the valve connects the condenser with the atmosphere.
- the fastest possible leakage may be necessary or useful, especially in case of fire.
- the braking according to the invention by means of the electric machine, a rapid leakage even without ventilation.
- This can be advantageous in particular in the case of a standstill of the system provided only for a short time, since the startup phase can be shortened after standstill, because the increased pressure in the turbine and possibly in the condenser for the ventilation need not or only to a lesser extent be reduced again.
- a preferred embodiment of the method according to the invention can therefore be provided that, depending on a planned downtime for the system braking by generating a particular opposite operating direction of rotation torque by means of the electric machine either in combination with a ventilation of the turbine or without such ventilation ,
- Figure 1 is a feeding of three-phase alternating current into a connected network by means of a system according to the invention
- FIG. 2 shows a braking of the system by means of a brake alternating current
- FIG. 3 shows a braking of the system by means of a braking direct current.
- the system shown in the drawings comprises a
- Steam turbine 1 which is mechanically connected in a known manner via a shaft 2 with a usable as a generator electric machine 3.
- a transmission (not shown) may be provided between the steam turbine 1 and the electric machine 3.
- the steam turbine 1 is supplied via a supply line 4 heated steam, which flows through several turbine stages in the steam turbine 1, thereby relaxing and leads to a rotating drive of a rotatably connected to the shaft 2 rotor of the steam turbine 1.
- This rotational movement is applied to a rotor of the electric machine 3 thereby rotating relative to a stator of the electric machine 3, thereby inducing current.
- three-phase alternating current is generated, which is fed via a switching device 5 in the form of a circuit breaker in a network 10 connected thereto, wherein the switching device 5 is for this purpose in a first switching position (see Figure 1).
- the system further comprises a device for Dampfentnähme 9 from the steam turbine.
- the steam taken over it can be used in a known manner for the operation of a foreign system, not shown.
- two check valves in the form of check valves 11 may be integrated. These are to avoid a backflow of previously extracted steam into the steam turbine 1. Such backflow would be especially in closed
- the electric machine 3 When the system is switched off, the electric machine 3 is disconnected from the path via which it has fed the electrical energy into the network 10 during normal operation. This is done by switching the switching device 5 from the first to a second switching device. This is done
- the electric machine 3 of the system in the switched-off state is at least temporarily supplied with a braking current. This is so directed that the electric machine used in the normal operation of the system 3 as an electric motor is then used as an electric motor and thereby generates a reverse rotation of the operating direction.
- This torque which can be influenced by the amount of braking current, can be used to shorten its leakage immediately after the system has been switched off (use of the torque as braking torque). Furthermore, after a standstill of the system accidental restart can be prevented by a torque that would cause a restart, a correspondingly large torque by means of the electric machine 3 is opposite (use of the torque as a holding torque).
- the electrical energy for the use of the electric machine 3 as an electric motor can be taken from the network 10 in the preferred embodiment of the method according to the invention. This is also in the second switching position of
- Switching device 5 connected to the electric machine 3, each but with the interposition of a converter that converts the electrical energy provided by the network 10 or directed such that the electric machine 3 as
- FIG. 2 it is provided to apply a brake alternating current (three-phase alternating current) to the electric machine.
- the converter is thus formed there as an inverter 12.
- the electric machine 3 is supplied with a DC braking current.
- a rectifier 13 can be used, which converts the three-phase alternating current of the network 10 into the DC braking current.
- phase-out phase can optionally be additionally shortened.
- the fastest possible leakage may be necessary or useful, especially in the event of fire.
- rapid deceleration can also take place without the use of the vacuum breaker 8 as a result of the deceleration according to the invention by means of the electric machine 3. This can be advantageous in particular in the case of a standstill of the system provided only for a short time, since the start-up phase can be shortened after standstill because the pressure in the steam turbine 1 and the condenser 7 which is increased by the vacuum breakage need not be increased again or only to a reduced extent.
- the inventive design of the system also offers the ability to completely dispense with the check valves 11 in the device for Dampfentnähme 9 or at least reduce the number of conventional systems regularly redundant check valves 11.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Stopping Of Electric Motors (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE201310218631 DE102013218631A1 (de) | 2013-09-17 | 2013-09-17 | System aus einer Turbine und einer damit mechanisch gekoppelten Elektromaschine und Verfahren zum Betrieb eines solchen Systems |
PCT/EP2014/065132 WO2015039781A1 (de) | 2013-09-17 | 2014-07-15 | System aus einer turbine und einer damit mechanisch gekoppelten elektromaschine und verfahren zum betrieb eines solchen systems |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2992601A1 true EP2992601A1 (de) | 2016-03-09 |
Family
ID=51211747
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14741556.6A Withdrawn EP2992601A1 (de) | 2013-09-17 | 2014-07-15 | System aus einer turbine und einer damit mechanisch gekoppelten elektromaschine und verfahren zum betrieb eines solchen systems |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2992601A1 (de) |
DE (1) | DE102013218631A1 (de) |
WO (1) | WO2015039781A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106321162A (zh) * | 2015-06-30 | 2017-01-11 | 新特能源股份有限公司 | 一种直流锅炉滑参数停机的方法 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004004350B3 (de) * | 2004-01-29 | 2005-09-01 | Nordex Energy Gmbh | Verfahren zur Verringerung der Drehzahl eines Antriebsstranges in einer Windenergieanlage sowie Windenergieanlage mit mindestens zwei Nenndrehzahlen |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10156694B4 (de) * | 2001-11-17 | 2005-10-13 | Semikron Elektronik Gmbh & Co. Kg | Schaltungsanordnung |
DE102004016461A1 (de) * | 2004-03-31 | 2005-10-20 | Alstom Technology Ltd Baden | Generatoranlage und Verfahren zum Betreiben einer solchen |
CN202424599U (zh) * | 2011-12-23 | 2012-09-05 | 张家口卷烟厂有限责任公司 | 三相异步电动机制动单元 |
-
2013
- 2013-09-17 DE DE201310218631 patent/DE102013218631A1/de not_active Withdrawn
-
2014
- 2014-07-15 WO PCT/EP2014/065132 patent/WO2015039781A1/de active Application Filing
- 2014-07-15 EP EP14741556.6A patent/EP2992601A1/de not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004004350B3 (de) * | 2004-01-29 | 2005-09-01 | Nordex Energy Gmbh | Verfahren zur Verringerung der Drehzahl eines Antriebsstranges in einer Windenergieanlage sowie Windenergieanlage mit mindestens zwei Nenndrehzahlen |
Non-Patent Citations (2)
Title |
---|
GATTI E ET AL: "DIGITAL CONTROL OF LOAD COMMUTATED INVERTERS FOR STARTING EQUIPMENTOF GAS TURBINE POWER STATIONS", POWER ELECTRONICS IN GENERATION AND TRANSMISSION. BRIGHTON, SEPT. 13 - 16, 1993; [PROCEEDINGS OF THE EUROPEAN CONFERENCE ON POWER ELECTRONICS AND APPLICATIONS], LONDON, IEE, GB, vol. 8, 13 September 1993 (1993-09-13), pages 250 - 255, XP000470850 * |
See also references of WO2015039781A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2015039781A1 (de) | 2015-03-26 |
DE102013218631A1 (de) | 2015-03-19 |
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