WO1984000083A1 - Systeme de couplage electrique d'un generateur triphase - Google Patents

Systeme de couplage electrique d'un generateur triphase Download PDF

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Publication number
WO1984000083A1
WO1984000083A1 PCT/DK1983/000060 DK8300060W WO8400083A1 WO 1984000083 A1 WO1984000083 A1 WO 1984000083A1 DK 8300060 W DK8300060 W DK 8300060W WO 8400083 A1 WO8400083 A1 WO 8400083A1
Authority
WO
WIPO (PCT)
Prior art keywords
phase
generator
contactor
mains
phases
Prior art date
Application number
PCT/DK1983/000060
Other languages
English (en)
Inventor
Olav Droenen
Original Assignee
Olav Droenen
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 Olav Droenen filed Critical Olav Droenen
Publication of WO1984000083A1 publication Critical patent/WO1984000083A1/fr
Priority to DK67784A priority Critical patent/DK67784A/da

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Classifications

    • 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
    • H02J3/42—Synchronising a generator for connection to a network or to another generator with automatic parallel connection when synchronisation is achieved

Definitions

  • a system for electrically coupling a three phase generator is provided.
  • the present invention relates to the electrical coupling in of a three phase generator, e.g. an asynchronous windmill generator, for operatively connecting the generator with the A.C. mains or generally with another already operative generator.
  • a three phase generator e.g. an asynchronous windmill generator
  • a basic manner of coupling an asynchronous generator to the A.C. mains is to simply actuate a three poled contactor between the generator and the mains when the generator is rotated at a speed close to the relevant synchronous speed. It is well known, however, that this coupling method shows certain disadvantages, particularly with respect to the creation of very high current peaks and voltage fluctuations which, though soon dying out, may well cause considerable problems not only electrically, but also mechanically, since they are associated with strong torque pulsations of the entire rotary system.
  • phases of a generator may be constituted by specific individual phase windings as connected between the respective phase terminals and a common point, the so-called neutral point or zero point.
  • neutral point or zero point This applies to the so-called star-coupled generators, which are often used without any external connection of the zero point.
  • delta- or D-coupled generators the three windings are each connected between two phase terminals so as to diagram- atically form a triangle without any virtual zero-point and without one winding specifically referring to one phase.
  • these two basic winding systems are fully equivalent as seen from the exterior phase termin- als and it is common knowledge that they should both be operated or affected in an electrically balanced manner.
  • the invention or a primary aspect thereof is based on the recognition that the said pulsation problems •are widely eliminated if only two or even oneof the generator. phases are allowed to experience a gradual current increase, whereafter the respective remaining phase or phases will be connectable with the mains by simple abrupt contaction.
  • the pulsation problems are hereby essentially reduced, without the unbalanced coupling procedure giving rise to other problems.
  • the described advantage will be still more significant, because ' in such a generator, as mentioned, the first phase to be coupled in is arranged, diagrammatically, in series with another phase, whereby the desired gradual current increase in two phases will be achievable by means of but a single controlled valve, inasfar as the other end of the series connected are connectable, initially, through a very simple contactor, if not permanently connected with the relevant wire of the mains.
  • the desired result will hereby be achiev ⁇ able with the use of only one controlled valve in stead of three, whereby the total coupling system is produce- able at remarkably reduced costs.
  • the invention may be seen " as a further development of the invention as disclosed in the International Patent Application No. PCT/DK82/00037 (WO 82/03952) as published after the priority date of the present application.
  • a contactor for first connecting two of the phase terminals of the generator with the corresponding phase wires of the mains, either through some kind of- an impedance, which is active though one or more steps for limiting the current build-up and which is later on short circuited so as to be inoperative in normal operaton of the generator, or/and at such a specif c moment of the transient change of the mains voltage that the phase connection will already hereby cause a minimum of following fluctuation problems.
  • some prior art relating to three phase "motors" "with zero"
  • the present invention .relates to
  • Fig. 1 is a diagram of a coupling system according to the invention.
  • Figs. 4 and 5 are diagrams of further modified . coupling systems.
  • Fig. 1 is shown the three phases R, S and T of the mains 2 as connectable with a generator G, which is typically an asynchronous windmill generator.
  • a generator G which is typically an asynchronous windmill generator.
  • a triac Tr which may be substituted by' two antiparallel thyristors
  • This contactor 1 is double and is arranged so as to be operable to additionally connect the S-phase with the generator.
  • a further double contactor 2 is provided for switching on the R-phase and at the same time, via contacts 3,short-circuit the triac Tr.
  • the contactor 1 When the speed of the windmill at least roughly corresponds to the synchronous speed of the generator G the contactor 1 is actuated so as to establish a direct switching on of the S-phase and at the same time connect the triac Tr in the T-phase, whereby the triac will now be connected in the circuit from the T-phase through the two respective and series connected phases, of the generator to the S-phase.
  • the triac control unit designated 4, initially holds the triac closed, but is then actuated so as to gradually open the triac, whereby the current is allowed to rise gradually during a following time interval, which may be of the magnitude 10-100 msec or even longer.
  • OMPI of the current rise through the triac This lapse of time, of course, should not be unnecessarily * long, and in a preferred system the contactor 2 is actuated by a timer 400 msecs. after the actuation of the contactor 1. The contactor 2 will even cause the triac Tr to be short-circuited through the contacts 3, whereafter the triac may simply be switched off.
  • the contactor 1 is not principally required at all, but it will normally be desirable and even prescribed that a full galvanic separation between the generator and the mains can be established.
  • Fig. 2 the contactor 1 of Fig. 1 has been omitted, and contactor 2 has been divided into two separate contactors 2R and 2T.
  • the triac has been replaced by a single controlled thyristor Ty.
  • the control unit 4 is actuated so as to cause the thyristor * 10 * to.-graduallyopenforfull current. Because the thyristor is a one-way rectifier, it will be open for the A.C. current in one direction only, i.e. it will be effectively open half the time only, whereby the current is correspondingly limited.
  • OMFI short-circuited is at or close to its maximum.
  • the contactor 2R is caused to connect the generator with phase R shortly after the actuation of the contactor 2T.
  • Fig. 3 of the drawing is shown such a system, including two generators G- j and G2 in which but a single triac is used.
  • Fig. 3 corresponds almost fully to Fig. 1 with the exeption that the triac Tr is connected with the two generators in parallel, through individual three phase contactors 5 and 6, whereby the same triac is usable for the initial connection of each generator separately or selectively according to the relevant actuations of the contactors 5 of 6, while the final phase connection is still effected by means of the contactor 2, which even serves to short-circuit the * triac.
  • OMPI In Fig. 3 it is shown by way of example that the two generators G. and G2 are "star-coupled” and “D- coupled", respectively.
  • the generators are "without zero", but it is clearly within the scope of the invention to use the coupling system for generators as zero coupled to the mains.
  • a first possibility will be to simply disconnect the zero during the coupling in period by means of a separate contactor, whereby the coupling will correspond fully to the already described examples.
  • Another possibility as illustrated in Fig. 4 is to let the zero connection z remain operative and to initially connect but a single phase T to the mains through the controlled valve Tr and thus through the zero connection, while a contactor 7 is thereafter actuated to connect both of the other phases to the mains at one time or one after the other.
  • this contactor may also short-circuit the valve Tr.
  • Fig. 5 Yet another possibility as illustrated in Fig. 5 is to arrange the controlled valve Tr in the z-wire. With one generator winding already connected to the mains (T) , preferably through a separation contactor 8, this winding will be gradually energized when the valve Tr is opened. Shortly after that,the contactor 7 is actuated to connect the two other windings to - he respective main phases, whereafter the current in the z-wire will normally disappear.
  • valve Tr may be replaced with by a variable or shortable impedance or such impedances, as according to the said prior application. Also, similar elements may be placed even in the second phase connection and be operated for full connection of this phase or phase terminal before the third phase is finally connected to the mains.

Landscapes

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

Abstract

Pour le couplage électrique d'un générateur à énergie éolienne triphasé (G) au réseau électrique, lorsque le générateur est entraîné à une vitesse proche de la vitesse synchrone, un seul triac (Tr) accumule initialement le courant dans une ou deux phases d'une manière graduelle, après quoi la phase ou les deux phases restante(s), respectivement est (sont) connectée(s) au réseau électrique par l'intermédiaire d'un organe contacteur simple (2), ce qui permet de résoudre d'une manière simple et économique les problèmes habituels de fluctuation.
PCT/DK1983/000060 1982-06-16 1983-06-16 Systeme de couplage electrique d'un generateur triphase WO1984000083A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DK67784A DK67784A (da) 1982-06-16 1984-02-15 Indretning til elektrisk indkobling af en trefasegenerator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DK270782 1982-06-16

Publications (1)

Publication Number Publication Date
WO1984000083A1 true WO1984000083A1 (fr) 1984-01-05

Family

ID=8114873

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK1983/000060 WO1984000083A1 (fr) 1982-06-16 1983-06-16 Systeme de couplage electrique d'un generateur triphase

Country Status (2)

Country Link
EP (1) EP0111524A1 (fr)
WO (1) WO1984000083A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0329258A1 (fr) * 1988-02-19 1989-08-23 Electro Drive B.V. Appareil de couplage d'un générateur asynchrone à un réseau alternatif
DE4433283C1 (de) * 1994-09-19 1996-05-23 Abb Management Ag Verfahren und Vorrichtung zum Synchronisieren einer Synchronmaschine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1119401B (de) * 1958-07-04 1961-12-14 Sarl Gram Electric Mehrphasige elektrische Anlage und Verfahren zu ihrem Betrieb
US4015178A (en) * 1974-06-27 1977-03-29 Sprecher & Schuh Ag Reference value transmitter for a phase clipping control for starting a squirrel cage-asynchronous motor
US4072880A (en) * 1975-07-28 1978-02-07 Mitsubishi Denki Kabushiki Kaisha Starting control apparatus for AC load

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1119401B (de) * 1958-07-04 1961-12-14 Sarl Gram Electric Mehrphasige elektrische Anlage und Verfahren zu ihrem Betrieb
US4015178A (en) * 1974-06-27 1977-03-29 Sprecher & Schuh Ag Reference value transmitter for a phase clipping control for starting a squirrel cage-asynchronous motor
US4072880A (en) * 1975-07-28 1978-02-07 Mitsubishi Denki Kabushiki Kaisha Starting control apparatus for AC load

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0329258A1 (fr) * 1988-02-19 1989-08-23 Electro Drive B.V. Appareil de couplage d'un générateur asynchrone à un réseau alternatif
DE4433283C1 (de) * 1994-09-19 1996-05-23 Abb Management Ag Verfahren und Vorrichtung zum Synchronisieren einer Synchronmaschine

Also Published As

Publication number Publication date
EP0111524A1 (fr) 1984-06-27

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