EP3443660A1 - Système et procédé de génération d'une tension alternative triphasée à injecter dans un réseau de courant - Google Patents

Système et procédé de génération d'une tension alternative triphasée à injecter dans un réseau de courant

Info

Publication number
EP3443660A1
EP3443660A1 EP17720402.1A EP17720402A EP3443660A1 EP 3443660 A1 EP3443660 A1 EP 3443660A1 EP 17720402 A EP17720402 A EP 17720402A EP 3443660 A1 EP3443660 A1 EP 3443660A1
Authority
EP
European Patent Office
Prior art keywords
frequency
phase
voltage
turbine
generator
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Withdrawn
Application number
EP17720402.1A
Other languages
German (de)
English (en)
Inventor
Christoph Lehmann
Uwe Juretzek
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP3443660A1 publication Critical patent/EP3443660A1/fr
Withdrawn legal-status Critical Current

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
    • H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H02P9/007—Control circuits for doubly fed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/40—Synchronising a generator for connection to a network or to another generator
    • 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
    • H02P9/14—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field
    • H02P9/38—Self-excitation by current derived from rectification of both output voltage and output current of generator

Definitions

  • the invention relates to a system for generating a three-phase alternating voltage to be fed into a power network, comprising at least one turbine and at least one driven with the turbine alternator, wherein a Genera- torcardr the alternator rotatably coupled to a turbine runner ⁇ turbine.
  • the invention relates to a method for generating a fed into a power grid three-phase alternating voltage using at least one turbine and at least one driven with the turbine Drehstromgene ⁇ generator, wherein a generator rotor of the alternator is rotatably coupled to a turbine rotor of the turbine.
  • Systems for generating a three-phase AC voltage and for supplying a power network with the three-phase AC voltage are well known and are used in power plants.
  • Such a system comprises at least one turbine, for example a gas turbine of a gas and steam turbine power plant or a gas turbine power plant or a steam turbine, and at least one turbine generator driven three-phase generator, in particular turbogenerator.
  • a turbine rotor of the turbine is conventionally rigidly connected to a generator rotor of the alternator.
  • a three-phase AC voltage with a common power frequency of 50 Hz or 60 Hz with the alternator and to be able to feed into the power grid so the turbine rotor must therefore rotate conventionally with a frequency equal to 50 Hz or 60 Hz .
  • 50Hz gas turbines As the power and efficiency of gas turbines with egg ⁇ ner operating frequency of 50 Hz (50Hz gas turbines) are larger than the corresponding 60Hz gas turbine, there is an interest, 50Hz gas turbine and for supply of Stromnet- zen with a mains frequency of 60 Hz (60Hz power supply).
  • the performance of the largest 50Hz gas turbine is 44% greater than that of the largest 60Hz gas turbine.
  • an overall higher power limit than with 60 Hz gas turbines can be assumed, since the centrifugal forces acting on the turbine rotor blades can be controlled even with correspondingly longer turbine blades.
  • the efficiency advantage of a 50 Hz gas turbine variant over a 60 Hz gas turbine variant lies with scaled gas turbines (ie one turbine variant was derived from a base turbine variant via scaling factors) at about 0.3%, in particular by the smaller gap losses in the 50 Hz gas turbine variant.
  • An object of the invention is the applicability of turbines, particularly gas turbines, whose operating frequency is less than a line frequency of a power grid, chen to enable electrical power to Ver ⁇ provide the power system. Another object of the invention is to improve a frequency support operation of a system for generating a three-phase alternating voltage to be fed into a power grid.
  • a plant according to the invention for generating a fed into a current ⁇ mains three-phase alternating voltage comprising at least one turbine and at least one driven by the turbine alternator, wherein a generator rotor of the alternator is non-rotatably coupled to a turbine rotor of the turbine.
  • the plant comprises we ⁇ tendonss with an output side electrically connected to the Drehstromge ⁇ erator transformer, with a first three-phase AC voltage generated by the alternator a first voltage level and a first frequency into a second three-phase AC voltage having a second voltage level, which is lower than the first voltage level, and the first frequency is convertible.
  • the system comprises at least one output side electrically connected to the output side
  • Transformer connected frequency converter via which a rotor winding of the generator rotor with a third three ⁇ is phase AC voltage supplied and to which the second three-phase alternating voltage with the second voltage level and the first frequency in the third three-phase AC voltage with the second voltage level and a second frequency lower than the first Frequency is convertible.
  • the frequency converter is designed or controllable and / or regulated such that the second frequency corresponds to a difference between a mains frequency of the power network and the first frequency.
  • the first frequency of the first three-phase AC voltage generated by the alternator is lower than the mains frequency.
  • the rotor winding of the generator output is not supplied, as conventionally, with a DC voltage, but with a three-phase alternating voltage with the second frequency, wherein the second frequency of the respective difference between the mains frequency of the mains and the first frequency.
  • a magnetic field is generated between the generator rotor and a generator stator of the three-phase generator which rotates at the mains frequency.
  • a stator winding of the generator stand thus sees a magnetic field which rotates with the mains frequency, whereby a three-phase alternating voltage is induced at the mains frequency in the stator winding.
  • the stator winding of the generator stator can see a magnetic field which rotates with the mains frequency.
  • a frequency support by the system according to the invention can thereby be ensured independently of the rotational frequency of the generator rotor.
  • the system according to the invention can offer a frequency support in a much broader frequency band than conventional systems.
  • the design of the components of the system according to the invention does not have to be such that the components of the system must be able to fulfill a specific frequency support band.
  • the components can be designed for a specific operating point, in which in particular the system has a high efficiency and a high durability.
  • the invention to provide a system with an improved frequency support operation.
  • Deviations of the rotational frequency of the generator rotor or of the turbine rotor from the mains frequency of the power network can be compensated by supplying the rotor winding of the generator rotor with the third three-phase alternating voltage with the second voltage level and the second frequency.
  • a three-phase alternating voltage with the mains frequency can be generated, even if the rotational frequency of the generator rotor differs from the mains frequency. Therefore, it is not necessary to vary the rotational speed of the turbine rotor or of the generator rotor rotatably connected thereto, as is customary, in order to be able to adapt the frequency of the three-phase alternating voltage generated by the three-phase generator to the mains frequency.
  • the conditioning, and can their components, such as the turbine and the alternator designed for egg ⁇ NEN optimum operating point, and during the genann ⁇ th approximation at the operating point are maintained, which increases the efficiency of the system as a whole.
  • a 50 Hz gas turbine whose turbine rotor is rigidly or non-rotatably connected to the generator rotor of a 50 Hz three-phase generator can be used to supply a 60 Hz power grid.
  • the assembly formed in the ⁇ sem case from the 50 Hz AC generator, the transformer and the frequency converter can thus be according to the invention driven by a 50Hz gas turbine and feed a three-phase alternating voltage with a frequency of 60 Hz in a 60 Hz mains.
  • Turbines themselves can also be observed a corresponding reduction in specific costs, since the 50Hz turbine version of the 60Hz turbine version is usually derived by scaling and thereby increase the cost far less than the performance. This is enough space to compensate for the additional costs in particular ⁇ sondere caused by the drive.
  • the alternator includes a three-phase stator and a three-phase generator rotor.
  • the three-phase stator is preferably designed for the generation of a three-phase alternating voltage with the mains frequency, for example 60 Hz, a power grid and connected via a machine transformer directly to the power grid.
  • the three-phase stator can be designed in a usual form for synchronous generators design with a laminated stator unit and arranged thereon, three-phase two-layer stator winding.
  • the voltage of the stator winding can be in a customary for the particular application size, for example, at 22 kV for a 60Hz application.
  • the alternator rotor is coupled directly to the turbine rotor of the turbine.
  • the generator rotor can be designed with a laminated rotor unit and a three-phase rotor winding arranged thereon.
  • the three-phase Läu ⁇ ferwicklung can be interconnected in the star.
  • the height of the second voltage may be about 5 kV.
  • the three phases of the rotor winding are electrically connected with slip rings on one ner rotor shaft of the generator rotor connected. On the
  • Slip rings can run a three-phase brush system, which can be made up of several carbon brushes per phase and mounted on a standing brush apparatus. Can tensystem about Bürs- the third three-phase voltage of the inverter on the item under three-phase brush apparatus to the rotor winding of the rotating generator rotor übertra ⁇ gen.
  • the frequency converter can be electrically connected on the output side to the three-phase brushing apparatus. As a result, the rotor winding can be supplied, for example, with a 5 kV / l OHz three-phase system.
  • the frequency converter can be constructed, for example, as a converter with a constant voltage intermediate circuit.
  • the system according to the invention can also be used when the speed of the turbine is to be selected free of the usual mains frequencies in the amount of 50 Hz and 60 Hz, so as to further increase the maximum power of the turbine.
  • the system according to the invention can be applied to turbines with any operating speed and three-phase networks of any mains frequency. This allows an optimal design of the turbine with regard to maximum power and maximum efficiency. For example, a 45Hz gas turbine whose maximum power exceeds that of a 50Hz gas turbine will feed a 60Hz three-phase AC voltage into a 60Hz power grid by increasing the second frequency in the output circuit of the frequency converter.
  • a 45Hz gas turbine with the inventive system with appropriate design of the components and a suitable choice of the second frequency can also feed a 50Hz three-phase AC voltage in a 50Hz power grid.
  • large gas turbines can be combined with a three-phase transformer-to-frequency converter configuration which allows gas turbines to be supplied to a power grid at a speed different from the grid frequency to join.
  • a three-phase generator according to the invention for example, a 60 Hz three-phase system can be generated when driven by a 50 Hz gas turbine, whereby 50 Hz Gasturbines can be applied to the 60 Hz market. The performance and efficiency of such a configuration are increased over a 60Hz gas turbine engine.
  • Frequency converter costs of about 50 € / kW. Furthermore, specific package costs decrease by more than 25%. In addition, the overall feltions Fischsgrad (CHP) increases by 0.6%, with the already to ⁇ sharmlichen, conservative determined,
  • the system comprises at least a three-phase
  • Capacitor battery which is connected in parallel to an output circuit of the frequency ⁇ converter.
  • Capacitor battery provides a reactive power for the Läu ⁇ ferwicklung. This reduces the electrical current to be supplied by the frequency converter, which in turn reduces the size of the frequency converter. In particular ⁇ sondere it is due to the presence of
  • Capacitor battery makes it possible not to drive all the power of the alternator, but only about 20% of this power through the frequency converter, resulting in a corresponding reduction in the cost of the inverter and to improve the overall efficiency of the arrangement of the alternator and the frequency converter.
  • the overall somewhat poorer efficiency of this arrangement over a simple three-phase generator can be overcompensated by the improved efficiency of the driving turbine, in particular with reduced operating frequency.
  • the generator voltage can nevertheless be of a conventional order of magnitude.
  • the system preferably comprises at least one communication ⁇ technically connected to the frequency converter control and / or control electronics, which is adapted to capture a momenta ⁇ ne difference between the mains frequency of the power grid and the first frequency and to drive the frequency converter as a function of the instantaneous difference.
  • the frequency converter can thus be controlled and / or regulated as a function of the detected instantaneous difference between the mains frequency of the power grid and the first frequency.
  • the instantaneous frequency and the instantaneous power ⁇ first frequency can be detected by a sensor and the control and / or control electronics are fed for evaluation.
  • the system according to one of its embodiments or any combination of at least two of these embodiments can be used together to carry out the method.
  • advantageous embodiments of the system may be advantageous embodiments of the method, even if it is not explicitly referred to in the following.
  • the three-phase AC voltage is generated by converting a three-phase AC voltage generated by the AC generator.
  • the transformer-frequency converter arrangement of the system according to the invention can be used, which is associated with the abovementioned advantages.
  • Fig. 1 is a schematic representation of astrasbei ⁇ game for a system according to the invention.
  • Fig. 1 shows a schematic representation of an execution ⁇ be injected example of an inventive system 1 for generating ei ⁇ ner into a power grid 2 three-phase AC voltage.
  • the plant 1 comprises a turbine 3 in the form of a 50 Hz gas turbine and a driven with the turbine 3 alternator 4.
  • the alternator 4 comprises a three-phase stator 5 in the form of a 60Hz three-phase stator and a generator rotor 6.
  • the generator rotor 6 of the alternator 4 is rotatably on coupled an unshown turbine ⁇ runner of the turbine. 3
  • the alternator 4 is connected via a circuit breaker 7 and a machine transformer 8 to the power grid 2.
  • the plant 1 further comprises an output side elekt ⁇ driven connected to the alternator 4 transformer 9, with the first three-phase AC voltage generated by the alternator 4 with a first voltage level and a first frequency to a second three-phase alternating voltage to a second voltage level which is less than the first voltage level, and the first frequency is convertible.
  • the system 1 comprises an output side electrically connected to the transformer 9 frequency converter 10, via which a rotor winding of the Generatorläu ⁇ fers 6, not shown, can be supplied with a third three-phase alternating voltage and with the second three-phase alternating voltage with the second voltage level and the first frequency in the third Three-phase AC voltage with the second voltage level and a second frequency, which is lower than the first frequency, is convertible.
  • the frequency converter 10 is designed or controllable and / or regulated such that the second frequency corresponds to a difference between a mains frequency of the power network 2 and the first frequency.
  • the three phases of the rotor winding of the generator rotor 6 are electrically connected to ungetippo slip rings on a rotor shaft 13 of the generator rotor 6.
  • On the slip rings a not shown, three-phase Bürs- runs orb that is constructed from a plurality of carbon brushes, not shown, per phase and in a stationary brush apparatus 14 mon ⁇ advantage.
  • the third three-phase ⁇ voltage is transmitted from the frequency converter 10 to the rotor winding of the rotating generator rotor 6.
  • Appendix 1 comprises a three-phase
  • Capacitor battery 11 which is connected in parallel to a not shown gear from ⁇ circuit of the inverter 10 degrees.
  • the system 1 includes a communications technology with the frequency converter 10 connected control and / or regulating electronics 12, which is adapted to detect a momentary difference between the mains frequency of the power network 2 and the first frequency and to drive the frequency converter 10 as a function of the instantaneous difference.

Abstract

L'invention concerne un système de génération d'une tension alternative triphasée destinée à être injectée dans un réseau de courant, le système comprenant au moins une turbine, au moins un générateur de courant triphasé entraîné par la turbine, un rotor du générateur de courant triphasé étant accouplé solidairement en rotation à un rotor de la turbine, au moins un transformateur qui est relié électriquement côté sortie au générateur de courant triphasé et au moyen duquel une première tension alternative triphasée généré par le générateur de courant triphasé et ayant une première amplitude de tension et une première fréquence peut être convertie une seconde tension alternative triphasée ayant une deuxième amplitude de tension, inférieure à la première amplitude de tension, et la première fréquence, au moins un convertisseur de fréquence qui est relié électriquement côté sortie au transformateur et au moyen duquel un enroulement du rotor de générateur peut être alimenté avec une troisième tension alternative triphasée et la deuxième tension alternative triphasée ayant la deuxième amplitude de tension et la première fréquence peut être convertie en la troisième tension alternative triphasée ayant la deuxième amplitude de tension et une deuxième fréquence inférieure à la première fréquence. Le convertisseur de fréquence est conçu ou commandée et/ou régulée de telle sorte que la deuxième fréquence correspond à une différence entre une fréquence du réseau de courant et la première fréquence.
EP17720402.1A 2016-05-23 2017-04-20 Système et procédé de génération d'une tension alternative triphasée à injecter dans un réseau de courant Withdrawn EP3443660A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP16170763.3A EP3249801A1 (fr) 2016-05-23 2016-05-23 Installation et procede de production d'une tension triphasee alternative a injecter dans un reseau electrique
PCT/EP2017/059429 WO2017202547A1 (fr) 2016-05-23 2017-04-20 Système et procédé de génération d'une tension alternative triphasée à injecter dans un réseau de courant

Publications (1)

Publication Number Publication Date
EP3443660A1 true EP3443660A1 (fr) 2019-02-20

Family

ID=56083939

Family Applications (2)

Application Number Title Priority Date Filing Date
EP16170763.3A Withdrawn EP3249801A1 (fr) 2016-05-23 2016-05-23 Installation et procede de production d'une tension triphasee alternative a injecter dans un reseau electrique
EP17720402.1A Withdrawn EP3443660A1 (fr) 2016-05-23 2017-04-20 Système et procédé de génération d'une tension alternative triphasée à injecter dans un réseau de courant

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP16170763.3A Withdrawn EP3249801A1 (fr) 2016-05-23 2016-05-23 Installation et procede de production d'une tension triphasee alternative a injecter dans un reseau electrique

Country Status (4)

Country Link
US (1) US20190190420A1 (fr)
EP (2) EP3249801A1 (fr)
JP (1) JP2019517239A (fr)
WO (1) WO2017202547A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200259404A1 (en) * 2019-02-08 2020-08-13 New York University High frequency ac power generator

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CA2174568C (fr) * 1995-04-21 2009-11-17 Mark A. Runkle Systeme d'interconnexion pour la transmission d'energie entre systemes electriques
JP4269941B2 (ja) * 2004-01-08 2009-05-27 株式会社日立製作所 風力発電装置およびその制御方法
US9306473B2 (en) * 2005-07-01 2016-04-05 Vestas Wind Systems A/S Variable rotor speed wind turbine, wind park, method of transmitting electric power and method of servicing or inspecting a variable rotor speed wind turbine
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Also Published As

Publication number Publication date
EP3249801A1 (fr) 2017-11-29
WO2017202547A1 (fr) 2017-11-30
JP2019517239A (ja) 2019-06-20
US20190190420A1 (en) 2019-06-20

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