WO1996010289A1 - Alternator - Google Patents
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- WO1996010289A1 WO1996010289A1 PCT/AT1995/000185 AT9500185W WO9610289A1 WO 1996010289 A1 WO1996010289 A1 WO 1996010289A1 AT 9500185 W AT9500185 W AT 9500185W WO 9610289 A1 WO9610289 A1 WO 9610289A1
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- WIPO (PCT)
- 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.)
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Classifications
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- 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.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
Description
iarrig l RtrommasnhinP iarrig l RtrommasnhinP
Die Erfindung betrifft eine WechselStrommaschine mit zwei Stator- und zwei diesen zugeordneten Rotorwicklungen, wobei die beiden Rotorwicklungen mit gleicher Drehzahl gedreht werden und elektrisch miteinander verbunden sind, und wobei der eine Stator mit dem Netz verbunden ist und der andere Stator von einem Umrichter erregt wird.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.
Am Beispiel einer Windkraftanlage wird der Vorteil der Erfindung erklärt. Windkraftanlagen sind Anlagen die einerseits einer stochastisch-dynamischen Belastung und andererseits einer hohen statischen Belastung ausgesetzt sind. Es treten Last¬ wechselzahlen in der Größenordnung von 1E9 auf, begleitet von quasi-statischen Belastungen aus extremen Windböen die theo¬ retisch bis zu 240km/h erreichen können.The advantage of the invention is explained using the example of a wind turbine. 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.
Um nun eine optimale Auslegung der mechanischen Komponenten einer Windkraftanlage zu ermöglichen, ist es vordringlich notwendig, neben einer sorgfältigen Auswahl der eingesetzten Materialien die statischen und dynamischen Belastungen so klein wie möglich zu halten. Dies um so mehr, je größer die Windkraftanlage ist, und je böiger die Windverhältnisse am Aufstellort sind.In order to enable an optimal design of the mechanical components of a wind power plant, it is urgently necessary to keep the static and dynamic loads as low as possible in addition to a careful selection of the materials used. The larger the wind turbine, and the gustier the wind conditions at the installation site, the more so.
Es gibt nun verschiedene Möglichkeiten, die auf eine Anlage einwirkenden Belastungen zu reduzieren. Neben der häufig verwendeten Rotorblattverstellung weisen fortschrittliche Anlagenkonzepte immer häufiger eine variable Drehzahl auf.There are now various options for reducing the loads acting on a system. In addition to the frequently used rotor blade adjustment, advanced system concepts increasingly have a variable speed.
Aus Belastungsmessungen ist der Vorteil einer Betriebsführung mit variabler Rotordrehzahl bekannt. Durch Windböen verursachte Lastspitzen werden durch Massenbeschleunigung des Rotors abgebaut. Ein zusätzlicher Vorteil der variablen Drehzahl ist, daß durch Anpassung der Rotordrehzahl an die Windge¬ schwindigkeit eine wesentliche Verbesserung des aerodynamischen Wirkungsgrades erzielt wird.The advantage of operational management with variable rotor speed is known from load measurements. Load peaks caused by wind gusts are reduced by mass acceleration of the rotor. An additional advantage of the variable speed is that a substantial improvement in the aerodynamic efficiency is achieved by adapting the rotor speed to the wind speed.
Systeme zur Verwirklichung einer variablen Drehzahl sind fast ausschließlich elektrischer Natur. Es sind zum Beispiel entweder fremderregte Synchronmaschinen in Verbindung mit einer Kombination aus Maschinengleichrichter und netzgeführtem Wechselrichter, oder doppeltgespeiste Asynchrongeneratoren bekannt. Diese doppeltgespeisten Asynchrongeneratoren bestehen aus einem Schleifringläufer-Generator und einem Umrichter, der über den Schleifring den Rotor des Generators im untersyn¬ chronen Betrieb erregt, bzw. im übersynchronen Betrieb die Schlupf - Verlustleistung ins Netz zurückspeist.Systems for realizing a variable speed are almost exclusively electrical. For example it is either externally excited synchronous machines in connection with a combination of machine rectifier and grid-controlled inverter, or double-fed asynchronous generators are known. These double-fed asynchronous generators consist of a slip ring generator and a converter, which excites the rotor of the generator in under-synchronous operation via the slip ring, or feeds the slip power loss back into the network in oversynchronous operation.
Als größte Nachteile der bekannten elektrischen Systeme zur Verwirklichung der variablen Drehzahl sind deren technisch aufwendige und teure Bauart anzuführen. Weiters erzeugt die Variante mit Synchrongenerator/Wechselrichter hohe harmonische Oberwellen, und darüberhinaus auch entsprechend hohe Zusatz- Verluste. Diese Probleme fallen zwar bei der doppeltgespeisten Asynchronmaschine nicht in diesem Ausmaß an, da dieses Genera¬ torsystem mit einem wesentlich kleineren Umrichter arbeitet, jedoch ist eine solche Maschine meist mit einem Schleifring ausgestattet, der einem Verschleiß unterliegt.The greatest disadvantages of the known electrical systems for realizing the variable speed are their technically complex and expensive design. Furthermore, the variant with synchronous generator / inverter generates high harmonic harmonics, and also correspondingly high additional losses. Although these problems do not occur to such an extent in the double-fed asynchronous machine, since this generator system works with a much smaller converter, such a machine is usually equipped with a slip ring which is subject to wear.
Aus der EP-A 0 121 584 ist eine Schaltung bekannt, die eine besondere Form der doppeltgespeisten Asynchronmaschine darstellt. Gemäß der EP-A 0 121 584 ist die Schaltung so auszuführen, daß auf dem drehenden Teil des Generators zwei kreuzweise miteinander verbundene Rotorwicklungen angebracht sind, welche die gleiche Anzahl von Polpaaren aufweisen. Die Ständerwicklungen haben ebenfalls die gleiche Polpaarzahl. Durch einen derartigen Aufbau als Ersatz zu einer oben er¬ wähnten doppeltgespeisten Asynchronmaschine wird einerseits der Einsatz eines Schleifringes vermieden und andererseits der zur Erregung notwendige Umrichter kleiner. Die folgende Tabelle 1 zeigt am Beispiel einer lMW-Anlage die etwa erforderlichen Größen für Ständer-Hauptwicklung (Ständer 1 ) und Umrichter in Abhängigkeit von der Rotordrehzahl für eine Generatorausführung gemäß der EP-A 0 121 584, für eine 2-polige Maschine im untersynchronen Betrieb des Ständer/Rotor-Systems 1. A circuit is known from EP-A 0 121 584 which represents a special form of the double-fed asynchronous machine. According to EP-A 0 121 584, 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. With such a construction as a replacement for a double-fed asynchronous machine mentioned above, on the one hand the use of a slip ring is avoided and on the other hand the converter required for excitation is smaller. 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.
Die Aufgabe dieser Erfindung ist, es die Größe des zur Magne¬ tisierung und Erregung notwendigen Umrichters weiter zu verkleinern.The object of this invention is to further reduce the size of the converter required for magnetization and excitation.
Gelöst wird diese Aufgabe bei einer gattungsgemäßen WechselStrommaschine dadurch, daß zu den einzelnen Strängen der mit dem Netz verbundenen Ständerwicklung Kondensatoren parallel geschaltet sind.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.
Den sich damit gegenüber der EP-A 0 121 584 ergebende Vorteil zeigt Tabelle 2, wobei hierbei grundsätzlich die selben Randbedingungen gelten wie zu Tabelle 1 angeführt, jedoch daß aufgrund der parallel geschalteten Kondensatoren die Magnetisierungsleistung nicht mehr vom Umrichter geliefert wird, und somit der Umrichter nur die Schlupfleistung liefern muß.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.
Rotor- Kondensa¬ Schlupf¬ Leistung Leistung Drehzahl tor leistung Ständer 1 Gesamt¬ in upm Leistung Umrichter in kVA system in kVAr in kVA in kVARotor-condensate output power output speed gate output stand 1 total in rpm output converter in kVA system in kVAr in kVA in kVA
1550 200 1 9 101550 200 1 9 10
1800 200 13 87 1001800 200 13 87 100
2100 200 51 249 3002100 200 51 249 300
2400 200 75 425 5002400 200 75 425 500
2700 200 71 729 8002700 200 71 729 800
2950 200 20 980 10002950 200 20 980 1000
Tabelle 2Table 2
Der sich gegenüber der EP-A 0 121 584 ergebende Vorteil ist die Reduktion der max. erforderlichen Umrichter-Leistung von etwa 214kVA auf 75kVA durch den Einsatz von Kondensatoren, und dadurch eine wesentliche Verringerung der Anlagenkosten. Weiters verkleinert sich im gleichen Ausmaß die Ständer/Rotor- Erregerwicklung. Dies und vor allem die Reduktion der Umrichterverluste (durch die kleinere Ausführung) bewirkt zusätzlich eine Verbesserung des System-Gesamtwirkungsgrades.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.
Weitere Merkmale und Vorteile der Erfindung ergeben sich aus den Unteransprüchen und der nachfolgenden Beschreibung eines Ausführungsbeispiels der Erfindung unter Bezugnahme auf die Zeichnungen.Further features and advantages of the invention result from the subclaims and the following description of an embodiment of the invention with reference to the drawings.
Es zeigt:It shows:
Fig. 1 eine Ausführungsform einer drehzahlvariablen Elektrik gemäß dem Stand der Technik (Synchrongenerator/-1 shows an embodiment of a variable-speed electrical system according to the prior art (synchronous generator / -
Wechselrichter) ,Inverter),
Fig. 2 eine weitere Ausführungsform einer drehzahlvariablenFig. 2 shows another embodiment of a speed variable
Elektrik gemäß dem Stand der Technik (doppeltgespeiste Asynchronmaschine mitState-of-the-art electrics (double-fed asynchronous machine with
Schleifringläufer)Slip ring rotor)
Fig. 3 eine Ausführungsform einer drehzahlvariablen Elektrik in Anlehnung an die EP-A 0 121 584, und Fig. 4 eine Ausführungsform einer drehzahlvariablen Elektrik gemäß vorliegender Erfindung.3 shows an embodiment of a variable-speed electrical system based on EP-A 0 121 584, and FIG. 4 shows an embodiment of a variable-speed electrical system according to the present invention.
Fig. 1 zeigt den Aufbau der bisher meistverwendeten Form einer drehzahlvariablen Elektrik für Windkraftanlagen. Diese besteht aus einem fremderregten Synchrongenerator 1, der mit variabler Frequenz arbeitend an einen Gleichrichter 2 gekoppelt ist. Im Gleichstrom-Zwischenkreis wird der Gleichstrom mittels einer Drossel 3 geglättet und anschließend im Umrichter 4 wechselgerichtet. Die Leistungskapazität des Umrichters muß in diesem Fall gleich groß wie die Nennleistung des Gesamtsystems sein.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 zeigt die klassische Form einer doppeltgespeistenFig. 2 shows the classic form of a double-fed
Asynchronmaschine. Der Ständer 5 einer Drehstrommaschine ist mit dem Netz 6 verbunden. Der gewickelte Rotor 7 dieser Maschine wird durch einen Schleifring 8 mit einem Umrichter 9 verbunden. Ist dieser Umrichter mit zwei steuerbaren Umrichter- Brücken (rotorseitig Bezugszeichen 10, netzseitig Bezugszeichen 11) ausgestattet, kann die doppeltgespeiste Asynchronmaschine sowohl über- als auch untersynchron betrieben werden.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.
Um jedoch einen mit Tabelle 2 vergleichbaren Drehzahlbereich bei gleicher System-Gesamtleistung zu gewährleisten ist der Umrichter 9 mit einer Nennleistung von ca. 300kW auszulegen.However, 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.
Gemäß der EP-A 0 121 584 besteht die Hauptmaschine aus einem Ständer 12 und einem Rotor 13 wie in Fig. 3 gezeigt ist. Auf einer mit dem Rotor 13 gemeinsamen Rotorwelle ist der Erregerrotor angebracht. Diesem gegenüber befindet sich der Erregerständer 15. Die Wicklungen der beiden Rotoren 13 und 14 sind kreuzweise miteinander verbunden.According to EP-A 0 121 584, 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.
Fig. 4 zeigt eine mögliche Ausführungsform der vorliegenden Erfindung. Eine vorzugsweise 4-polige/3-phasige Ständerwicklung 16 ist an das Netz 17 angeschlossen. Dieser Ständerwicklung 16 wird eine auf der Antriebswelle sitzende 4-polige/3-phasige Rotorwicklung 18 gegenüberliegend angeordnet. Auf derselben Antriebswelle sitzt eine 2-polige/3-phasige Rotorwicklung 19 die mit der Rotorwicklung 18 verbunden ist. Der Rotorwicklung 18 gegenüberliegend angeordnet ist eine 2-polige/3-phasige Ständerwicklung 20.4 shows a possible embodiment of the present invention. 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.
Mittels Kabelzuleitung werden den einzelnen Strängen der Ständerwicklung 16 Kondensatoren 21 parallel geschaltet. Um Oberwellen zu filtern, bzw. um die Kondensatoren 21 zu schützen werden den Kondensatoren 21 vorzugsweise Drosseln 22 vorgeschaltet.16 individual capacitors 21 are connected in parallel by means of a cable feed. In order to filter harmonics or to protect the capacitors 21, the capacitors 21 are preferably preceded by chokes 22.
Von der maschinenseitigen Umrichterbrücke 24 des Umrichters 23 wird der Ständer 20 mit Erregungsstrom variabler Frequenz und Spannung beaufschlagt. Durch Induktion werden die Rotorwick¬ lungen 19 und 18 und in weiterer Folge die Ständerwicklung 16 erregt.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.
Die zur Magnetisierung des Generators erforderliche Blindlei- stung liefern die Kondensatoren 21. Die Lage des Rotors wird beispielweise mittels eines mit der Antriebswelle verbundenen Encoders erfaßt. Phasenlage und Betrag von Rotorström und -Spannung können entweder durch Berechnung mittels Transferfunktion basierend auf den Strom- und Spannungs-Meßdaten am Erreger-Ständer 20 oder durch direkte Messung im Rotorkreis 18, 19 ermittelt werden.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.
Aus den Meßwerten des Encoders (Rotordrehzahl, Rotorlage) einerseits, und den direkten Rotorstrom- und Rotorspannungs- meßwerten bzw. den mittels Transferfunktion errechneten Rotorwerten errechnet sich ein vorzugsweise im Umrichter integrierter Rechner die für den Umrichter 23 erforderlichen Erregungskennwerte, damit schlußendlich der Ständer 16 bei variabler Rotordrehzahl die gewünschte Leistung mit konstanter Netzfrequenz und regelbarem Blindleistungsfaktor ins Netz abgibt.From the measured values of the encoder (rotor speed, rotor position) on the one hand, and the direct rotor current and rotor voltage measured values or the rotor values calculated by means of the transfer function, 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.
D.h., ein Regelungssystem errechnet die notwendige Einstellung von Erregerstrom und Frequenz, um abhängig von der Rotordrehzahl die Systemabgabeleistung und den Systemblindlei¬ stungsfaktor entsprechend einer vorgegebenen Kennlinie ein¬ zustellen.In other words, 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.
Die durch den untersynchronen Betrieb vom Rotor/Stator-system 19, 20 entstehende Schlupfleistung wird dem Netz 17 entnommen.Der dazu erforderliche Umrichter 23 hat dazu vorzugsweise netzseitig eine Gleichrichter-Brücke 25.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.
Beim Start der Anlage ist der Ständer 16 anfänglich noch vom Netz 17 getrennt. Durch geeignete Erregung mittels Umrichter 23 werden Ständerspannung und Netzspannung synchronisiert, und dann der Ständer 16 mittels Schalter 26 ans Netz 17 geschaltet. 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.
Claims
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19581090T DE19581090D2 (en) | 1994-09-26 | 1995-09-26 | AC machine |
| EP95931075A EP0783793A1 (en) | 1994-09-26 | 1995-09-26 | Alternator |
| AU34648/95A AU3464895A (en) | 1994-09-26 | 1995-09-26 | Alternator |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT183294 | 1994-09-26 | ||
| ATA1832/94 | 1994-09-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1996010289A1 true WO1996010289A1 (en) | 1996-04-04 |
Family
ID=3521971
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/AT1995/000185 Ceased WO1996010289A1 (en) | 1994-09-26 | 1995-09-26 | Alternator |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0783793A1 (en) |
| AU (1) | AU3464895A (en) |
| DE (1) | DE19581090D2 (en) |
| WO (1) | WO1996010289A1 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0877475A1 (en) * | 1997-05-07 | 1998-11-11 | NORDEX Balcke-Dürr GmbH | Method for regulating the current delivered by a wind power plant and supplied to a power grid, and circuit operating according to this method |
| RU2211519C2 (en) * | 2001-09-11 | 2003-08-27 | Джендубаев Абрек-Заур Рауфович | Welding induction generator |
| WO2004055959A1 (en) * | 2002-12-17 | 2004-07-01 | Siemens Aktiengesellschaft | Double-fed asynchronous machine without a slip ring |
| RU2265271C1 (en) * | 2004-04-26 | 2005-11-27 | Мамаев Петр Прохорович | Commutatorless alternating-current machine |
| RU2332779C1 (en) * | 2007-06-01 | 2008-08-27 | Федеральное государственное образовательное учреждение высшего профессионального образования Кубанский государственный аграрный университет | Independent source of electric power |
| DE10227821B4 (en) | 2002-06-21 | 2019-10-24 | Seg Automotive Germany Gmbh | Determining load torque and output current of a vehicle generator by measuring the excitation current |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0121584A1 (en) * | 1983-04-07 | 1984-10-17 | Energia Andina Ltda. | 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 |
| EP0345204A2 (en) * | 1988-06-01 | 1989-12-06 | Bernhard Kirsch Gmbh + Co Kg | Wind energy converter |
-
1995
- 1995-09-26 EP EP95931075A patent/EP0783793A1/en not_active Withdrawn
- 1995-09-26 WO PCT/AT1995/000185 patent/WO1996010289A1/en not_active Ceased
- 1995-09-26 AU AU34648/95A patent/AU3464895A/en not_active Abandoned
- 1995-09-26 DE DE19581090T patent/DE19581090D2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0121584A1 (en) * | 1983-04-07 | 1984-10-17 | Energia Andina Ltda. | 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 |
| EP0345204A2 (en) * | 1988-06-01 | 1989-12-06 | Bernhard Kirsch Gmbh + Co Kg | Wind energy converter |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0877475A1 (en) * | 1997-05-07 | 1998-11-11 | NORDEX Balcke-Dürr GmbH | Method for regulating the current delivered by a wind power plant and supplied to a power grid, and circuit operating according to this method |
| RU2211519C2 (en) * | 2001-09-11 | 2003-08-27 | Джендубаев Абрек-Заур Рауфович | Welding induction generator |
| DE10227821B4 (en) | 2002-06-21 | 2019-10-24 | Seg Automotive Germany Gmbh | Determining load torque and output current of a vehicle generator by measuring the excitation current |
| WO2004055959A1 (en) * | 2002-12-17 | 2004-07-01 | Siemens Aktiengesellschaft | Double-fed asynchronous machine without a slip ring |
| RU2265271C1 (en) * | 2004-04-26 | 2005-11-27 | Мамаев Петр Прохорович | Commutatorless alternating-current machine |
| RU2332779C1 (en) * | 2007-06-01 | 2008-08-27 | Федеральное государственное образовательное учреждение высшего профессионального образования Кубанский государственный аграрный университет | Independent source of electric power |
Also Published As
| Publication number | Publication date |
|---|---|
| AU3464895A (en) | 1996-04-19 |
| DE19581090D2 (en) | 1999-06-17 |
| EP0783793A1 (en) | 1997-07-16 |
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