EP0783793A1 - Alternateur - Google Patents

Alternateur

Info

Publication number
EP0783793A1
EP0783793A1 EP95931075A EP95931075A EP0783793A1 EP 0783793 A1 EP0783793 A1 EP 0783793A1 EP 95931075 A EP95931075 A EP 95931075A EP 95931075 A EP95931075 A EP 95931075A EP 0783793 A1 EP0783793 A1 EP 0783793A1
Authority
EP
European Patent Office
Prior art keywords
stator
rotor
converter
power
speed
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Withdrawn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
EP95931075A
Other languages
German (de)
English (en)
Inventor
Gerald Hehenberger
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0783793A1 publication Critical patent/EP0783793A1/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Withdrawn legal-status Critical Current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
    • H02P9/42—Arrangements for controlling electric generators for the purpose of obtaining a desired output to obtain desired frequency without varying speed of the generator
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K17/00—Asynchronous induction motors; Asynchronous induction generators
    • H02K17/42—Asynchronous induction generators
    • 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

Definitions

  • the invention relates to an alternating current machine with two stator windings and two rotor windings assigned to them, the two rotor windings being rotated at the same speed and being electrically connected to one another, and one stator being connected to the mains and the other stator being excited by a converter.
  • Wind turbines are systems that are exposed to a stochastic-dynamic load on the one hand and a high static load on the other. There are load change numbers in the order of magnitude of 1E9, accompanied by quasi-static loads from extreme wind gusts which can theoretically reach up to 240 km / h.
  • a circuit is known from EP-A 0 121 584 which represents a special form of the double-fed asynchronous machine.
  • the circuit is to be designed in such a way that two rotor windings are connected to one another on the rotating part of the generator and have the same number of pole pairs.
  • the stator windings also have the same number of pole pairs.
  • the following table 1 uses the example of an IMM system to show the sizes required for the main stator winding (stator 1) and converter depending on the rotor speed for a generator version according to EP-A 0 121 584, for a 2-pole machine in sub-synchronous mode Operation of the stator / rotor system 1.
  • the object of this invention is to further reduce the size of the converter required for magnetization and excitation.
  • This object is achieved in a generic alternating current machine in that capacitors are connected in parallel to the individual strands of the stator winding connected to the network.
  • Table 2 shows the advantage compared to EP-A 0 121 584, whereby the same basic conditions apply as listed in Table 1, but due to the capacitors connected in parallel, the magnetizing power is no longer supplied by the converter, and thus the converter only has to deliver the slip power.
  • the advantage compared to EP-A 0 121 584 is the reduction of the max. required converter power of about 214kVA to 75kVA through the use of capacitors, and thereby a significant reduction in system costs. Furthermore, the stator / rotor excitation winding is reduced to the same extent. This and, above all, the reduction of converter losses (due to the smaller version) additionally improves the overall system efficiency.
  • FIG. 1 shows an embodiment of a variable-speed electrical system according to the prior art (synchronous generator / -
  • Fig. 2 shows another embodiment of a speed variable
  • FIG. 3 shows an embodiment of a variable-speed electrical system based on EP-A 0 121 584
  • FIG. 4 shows an embodiment of a variable-speed electrical system according to the present invention.
  • Fig. 1 shows the structure of the most widely used form of a variable-speed electrical system for wind turbines. This consists of an externally excited synchronous generator 1, which is coupled to a rectifier 2 at a variable frequency. In the direct current intermediate circuit, the direct current is smoothed by means of a choke 3 and then alternately rectified in the converter 4. In this case, the power capacity of the converter must be the same as the rated power of the overall system.
  • Fig. 2 shows the classic form of a double-fed
  • Asynchronous machine The stator 5 of a three-phase machine is connected to the network 6.
  • the wound rotor 7 of this machine is replaced by a slip ring 8 with a converter 9 connected. If this converter is equipped with two controllable converter bridges (reference number 10 on the rotor side, reference number 11 on the network side), the double-fed asynchronous machine can be operated both over- and under-synchronously.
  • the converter 9 in order to ensure a speed range comparable to Table 2 with the same total system output, the converter 9 must be designed with a nominal output of approx. 300 kW.
  • the main machine consists of a stator 12 and a rotor 13 as shown in FIG. 3.
  • the exciter rotor is mounted on a rotor shaft common to the rotor 13. Opposite this is the exciter stand 15.
  • the windings of the two rotors 13 and 14 are cross-connected to one another.
  • a preferably 4-pole / 3-phase stator winding 16 is connected to the network 17.
  • a 4-pole / 3-phase rotor winding 18 seated on the drive shaft is arranged opposite this stator winding 16.
  • a 2-pole / 3-phase rotor winding 19 which is connected to the rotor winding 18 sits on the same drive shaft.
  • a 2-pole / 3-phase stator winding 20 is arranged opposite the rotor winding 18.
  • capacitors 21 are connected in parallel by means of a cable feed.
  • the capacitors 21 are preferably preceded by chokes 22.
  • the stator 20 is acted upon by excitation current of variable frequency and voltage from the machine-side converter bridge 24 of the converter 23.
  • the rotor windings 19 and 18 and subsequently the stator winding 16 are excited by induction.
  • the capacitors 21 provide the reactive power required to magnetize the generator.
  • the position of the rotor is detected, for example, by means of an encoder connected to the drive shaft.
  • the phase position and magnitude of the rotor current and voltage can be determined either by calculation using a transfer function based on the current and voltage measurement data on the excitation stand 20 or by direct measurement in the rotor circuit 18, 19.
  • a computer preferably integrated in the converter, calculates the excitation parameters required for the converter 23, and thus ultimately the stator 16 variable rotor speed delivers the desired power into the network with a constant network frequency and adjustable reactive power factor.
  • a control system calculates the necessary setting of excitation current and frequency in order to set the system output power and the system reactive power factor according to a predetermined characteristic curve depending on the rotor speed.
  • the slip power resulting from the sub-synchronous operation of the rotor / stator system 19, 20 is taken from the network 17.
  • the converter 23 required for this purpose preferably has a rectifier bridge 25 on the network side.
  • the stand 16 When the system is started, the stand 16 is initially still separated from the network 17.
  • the stator voltage and the mains voltage are synchronized by suitable excitation by means of converter 23, and then the stator 16 is connected to the mains 17 by means of a switch 26.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

Alternateur comprenant deux enroulements statoriques (16, 20) et deux enroulements rotoriques (18, 19) associés aux précédents, dans laquelle les deux enroulements rotoriques (18, 19) sont entraînés en rotation à la même vitesse et sont connectés électriquement entre eux. L'un des stators (16) est raccordé au réseau (17) et l'autre stator (20) est excité par un convertisseur (23). Des condensateurs (21) sont connectés en parallèle avec les phases individuelles des enroulements statoriques (16) connectés au réseau (17). Il s'ensuit que la puissance de magnétisation n'a plus à être fournie par le convertisseur (23), lequel n'a plus ainsi qu'à fournir la puissance de glissement.
EP95931075A 1994-09-26 1995-09-26 Alternateur Withdrawn EP0783793A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT1832/94 1994-09-26
AT183294 1994-09-26
PCT/AT1995/000185 WO1996010289A1 (fr) 1994-09-26 1995-09-26 Alternateur

Publications (1)

Publication Number Publication Date
EP0783793A1 true EP0783793A1 (fr) 1997-07-16

Family

ID=3521971

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95931075A Withdrawn EP0783793A1 (fr) 1994-09-26 1995-09-26 Alternateur

Country Status (4)

Country Link
EP (1) EP0783793A1 (fr)
AU (1) AU3464895A (fr)
DE (1) DE19581090D2 (fr)
WO (1) WO1996010289A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19719308A1 (de) * 1997-05-07 1998-11-12 Nordex Balcke Duerr Gmbh Verfahren zur Regelung der in ein Netz einzuspeisenden Ströme bei Windkraftanlagen sowie nach diesem Verfahren arbeitende Schaltung
DE10227821B4 (de) 2002-06-21 2019-10-24 Seg Automotive Germany Gmbh Bestimmen von Lastmoment und Ausgangsstrom eines Fahrzeuggenerators durch Messen des Erregerstromes
DE10259068A1 (de) * 2002-12-17 2004-07-15 Siemens Ag Schleifringlose doppeltgespeiste Asynchronmaschine

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3380196D1 (en) * 1983-04-07 1989-08-17 Andina Energia A rotating electric machine for use as generator
US4677364A (en) * 1985-01-04 1987-06-30 The United States Of America As Represented By The United States Department Of Energy Reactive power compensating system
DE3818597C1 (fr) * 1988-06-01 1989-12-28 Bernhard Kirsch Gmbh + Co Kg, 5500 Trier, De

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9610289A1 *

Also Published As

Publication number Publication date
AU3464895A (en) 1996-04-19
WO1996010289A1 (fr) 1996-04-04
DE19581090D2 (de) 1999-06-17

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