SE457132B - COMPLETE VOLTAGE LIMIT CIRCUIT AT A THREE-PHASE SYNC MACHINE - Google Patents

COMPLETE VOLTAGE LIMIT CIRCUIT AT A THREE-PHASE SYNC MACHINE

Info

Publication number
SE457132B
SE457132B SE8502166A SE8502166A SE457132B SE 457132 B SE457132 B SE 457132B SE 8502166 A SE8502166 A SE 8502166A SE 8502166 A SE8502166 A SE 8502166A SE 457132 B SE457132 B SE 457132B
Authority
SE
Sweden
Prior art keywords
inverter
voltage
limiting device
synchronous machine
phase synchronous
Prior art date
Application number
SE8502166A
Other languages
Swedish (sv)
Other versions
SE8502166D0 (en
SE8502166L (en
Inventor
A Schraeder
Original Assignee
Licentia Gmbh
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 Licentia Gmbh filed Critical Licentia Gmbh
Publication of SE8502166D0 publication Critical patent/SE8502166D0/en
Publication of SE8502166L publication Critical patent/SE8502166L/en
Publication of SE457132B publication Critical patent/SE457132B/en

Links

Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/66Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
    • H02M7/68Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
    • H02M7/72Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/75Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
    • H02M7/757Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Dc-Dc Converters (AREA)
  • Control Of Ac Motors In General (AREA)

Description

457 132 10 15 20 25 30 35 2 strömriktaren och utan att det behövs en styrd trefas- brygga, Fördelaktiga utföringsformer av kopplingsanordningen direkt till likströmsmellankretsen. enligt uppfinningen kännetecknas i underkraven. 457 132 10 15 20 25 30 35 2 converter and without the need for a controlled three-phase bridge, Advantageous embodiments of the coupling device directly to the direct current intermediate circuit. according to the invention are characterized in the subclaims.

Uppfinningen förklaras närmare i det följande i an- slutning till pà ritningen àtergivna utföringsexempel.The invention is explained in more detail in the following in connection with exemplary embodiments shown in the drawing.

Därvid visar fig 1 ett principkopplingsschema för en kopplinga- krets för begränsning av klämspänningen med direkt an- slutning av begränsningsanordningen till växelriktarens' utgång och fig 2 en motsvarande kopplingskrets med galvaniskt från växelriktaren skild begränsningsanordning.Fig. 1 shows a principle circuit diagram of a switching circuit for limiting the clamping voltage with direct connection of the limiting device to the output of the inverter and Fig. 2 a corresponding switching circuit with limiting device galvanically separated from the inverter.

I fig l visas en ur ett_trefasnät matad, nätdirige- rad, styrbar strömriktare 1, som enbart arbetar i lik- riktardrift och i enlighet med sin utstyrning bestämmer en växelriktares 2 ström och spänning via en likströms- mellankrets med mellankretsdrosslar 3, vilka gör ström- men lastoberoende. Mellankretsdrosslarna 3 kan uppvisa en gemensam kärna. Induktansens uppdelning pà tvà lind- ningar medför fördelen av bättre strömbegränsning vid jordfel. Till den, såsom antytts, med fassekvenssläck- ning arbetande växelriktarens 2 utgángsklämmor har an- slutits en (ej àtergiven) trefasasynkronmaskin, som exempelvis arbetar såsom fläktmotor. « För begränsning av vid kommuteringen på växelrikta- ren 2 uppkommande överspänningar har en begränsningsan- ordning anslutits till växelriktarens 2 utgángsklämmor.Fig. 1 shows a three-phase mains-fed, controllable, controllable converter 1, which operates only in rectifier operation and in accordance with its equipment determines the current and voltage of an inverter 2 via a direct current intermediate circuit with intermediate circuit chokes 3, which make current but load independent. The intermediate circuit chokes 3 may have a common core. The division of the inductance into two windings entails the advantage of better current limitation in the event of a ground fault. A (not shown) three-phase synchronous machine, which for example operates as a fan motor, has been connected to the output terminals of the inverter 2 operating with phase sequence extinguishing. «For limiting the overvoltages arising during commutation of the inverter 2, a limiting device has been connected to the output terminals of the inverter 2.

Denna begränsningsanordning består av en likriktarbryg- ga 4, två drosselspolar 6 samt en likströmsställare 8.This limiting device consists of a rectifier bridge 4, two choke coils 6 and a direct current switch 8.

Trefasasynkronmaskinens klämspänning, således växelrik- tarehs 2 utgångsspänning, likriktas i likriktarbryggan 4 och glättas med en kondensator 5, varigenom sker en begränsning av toppspänningen vid maskinen. Till följd av överspänning uppträdande överskottsenergi återmatas enligt uppfinningen via drosselspolarna 6 och likström- ställaren 8 till likströmsmellankretsen.The clamping voltage of the three-phase synchronous machine, thus the output voltage of the inverter 2, is rectified in the rectifier bridge 4 and smoothed with a capacitor 5, whereby the peak voltage at the machine is limited. Excess energy occurring as a result of overvoltage is fed according to the invention via the choke coils 6 and the direct current switch 8 to the direct current intermediate circuit.

A4 10 15 20 457 132 3 Genom impulsbreddmodulering av denna likströmsstäl- lare 8 kan det genomsnittliga strömflödet styras god- tyckligt. Lämpligen användes därvid spänningen över kondensatorn 5 såsom regleringsvärde.A4 10 15 20 457 132 3 By means of pulse width modulation of this DC switch 8, the average current flow can be controlled arbitrarily. Suitably, the voltage across the capacitor 5 is used as the control value.

Parallellt med drosselspolarna 6 har kopplats fri- gångsdioder 7, som är anordnade för drosselströmmens shuntning när likströmsställaren 8 är frånkopplad.In parallel with the choke coils 6, idle diodes 7 have been connected, which are arranged for the shunting of the choke current when the direct current switch 8 is switched off.

Som en modifikation av den i fig l visade kopplings- anordningen kan enligt fig 2 begränsningsanordningen via en transformator 9 kopplas till växelriktarens 2 utgångs- klämmor. Fördelen med detta kopplingssätt ligger i att växelriktaren 2 är galvaniskt skild från begränsnings- anordningen samt i möjligheten att i motsvarande män anpassa spänningen.As a modification of the switching device shown in Fig. 1, according to Fig. 2 the limiting device can be connected via a transformer 9 to the output terminals of the inverter 2. The advantage of this coupling method lies in the fact that the inverter 2 is galvanically separated from the limiting device and in the possibility of adjusting the voltage in the corresponding men.

Kopplingskretsen enligt uppfinningen lämpar sig en- dast vid positiv likspänning i likströmsmellankretsen, dvs vid utstyrning av den nätdirigerade strömriktaren 1 i likriktardrift. Denna begränsning av kopplingskretsens användning stör i praktiken endast i ett mycket litet fåtal fall, i vilka asynkronmaskinen behöver bromsas och en negativ ingàngsspänning erfordras.The switching circuit according to the invention is only suitable for positive direct voltage in the direct current intermediate circuit, ie for equipping the mains-directed converter 1 in rectifier operation. This limitation of the use of the switching circuit interferes in practice only in a very small number of cases, in which the asynchronous machine needs to be braked and a negative input voltage is required.

Claims (4)

457 152 10 15 20 25 30 PATENTKRAV457 152 10 15 20 25 30 PATENT REQUIREMENTS 1. l. Klämspänningsbegränsningskrets vid en trefasasyn- kronmaskin, som matas ur ett växelströmsnät via en frekvens- omformare, som uppvisar en nätdirigerad strömriktare (l), en likströmsmellankrets med lastoberoende ström och en själv- svängande växelriktare (2), via en pâ växelspänningssidan till växelriktarens (2) utgângsklämmor ansluten begräns- ningsanordning (4-8), som på likspänningssidan innefattar en till en kapacitans (5) ansluten, icke styrd likriktare (4), samt en styrbar, via en drosselspole (6) till kapaci- tansen (5) ansluten strömriktare, k ä n n e t e c k n a d därav, att begränsningsanordningens (4-8) styrbara ström- riktare är utformad såsom en trefasasynkronmaskinens kläm- spänning styrande, på nätströmriktarens likspänningssida ansluten likströmställare (8) via vilken vid överspän- ningar på trefasasynkronmaskinens klämmor uppträdande energi är återmatningsbar till likströmsmellankretsen så- som spänningskälla med varierbart spänningsvärde.1. l. A terminal voltage limiting circuit in a three-phase synchronous machine, which is fed from an AC mains via a frequency converter, which has a mains-directed converter (1), a DC intermediate circuit with load-independent current and a self-oscillating inverter (2) limiting device (4-8) connected to the output terminals of the inverter (2), which on the DC voltage side comprises an uncontrolled rectifier (4) connected to a capacitor (5), and a controllable, via a choke coil (6) to the capacitor (5) connected inverter, characterized in that the controllable inverter of the limiting device (4-8) is designed as a terminal voltage controller of the three-phase synchronous machine, a direct current switch (8) connected to the DC side of the mains via which overvoltage on the three-phase synchronous machine energy can be fed back to the DC intermediate circuit as a voltage source with a variable voltage value. 2. Anordning enligt krav l, k ä n n e t e c k n a d därav, att styrningen är anordnad att ske genom impuls- breddmodulation av likströmställaren (8) i beroende av den vid utgången av begränsningsanordningens likriktare (4) föreliggande spänningen. 'Device according to claim 1, characterized in that the control is arranged to take place by pulse width modulation of the direct current switch (8) in dependence on the voltage present at the output of the rectifier device (4). ' 3. Anordning enligt något av kraven l eller 2, n e t e c k n a d därav, att förbigângsdioder (7) är k ä n - parallellkopplade med begränsningsanordningens drosselspo- lar (6).Device according to one of Claims 1 or 2, characterized in that bypass diodes (7) are known - connected in parallel with the choke coils (6) of the limiting device. 4. Anordning enligt något av kraven l-3, t e c k n a d därav, att mellan växelriktarens (2) utgångs- k ä n n e - klämmer och begränsningsanordningen (4-8) är inkopplad en transformator (9).Device according to one of Claims 1 to 3, characterized in that a transformer (9) is connected between the output terminal (2) of the inverter (2) and the limiting device (4-8).
SE8502166A 1984-05-11 1985-05-02 COMPLETE VOLTAGE LIMIT CIRCUIT AT A THREE-PHASE SYNC MACHINE SE457132B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19843418020 DE3418020C2 (en) 1984-05-11 1984-05-11 Circuit arrangement for limiting the voltage of a motor fed by a current-impressing converter

Publications (3)

Publication Number Publication Date
SE8502166D0 SE8502166D0 (en) 1985-05-02
SE8502166L SE8502166L (en) 1985-11-12
SE457132B true SE457132B (en) 1988-11-28

Family

ID=6235898

Family Applications (1)

Application Number Title Priority Date Filing Date
SE8502166A SE457132B (en) 1984-05-11 1985-05-02 COMPLETE VOLTAGE LIMIT CIRCUIT AT A THREE-PHASE SYNC MACHINE

Country Status (4)

Country Link
CH (1) CH668673A5 (en)
DE (1) DE3418020C2 (en)
FI (1) FI851735L (en)
SE (1) SE457132B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH074067B2 (en) * 1986-01-24 1995-01-18 株式会社明電舍 Reactive power processing circuit of current source GTO inverter
DE9307806U1 (en) * 1993-05-24 1993-08-26 Siemens Ag Inverter output filter
DE10353896A1 (en) * 2003-11-18 2005-06-16 Alstom Technology Ltd Frequency converter for static run-up device esp. for turbine installation, includes DC link circuit with part circuits

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1238989B (en) * 1962-01-10 1967-04-20 Licentia Gmbh Arrangement for controlling or regulating the speed of a three-phase asynchronous motor with squirrel-cage rotor
DE2455765C2 (en) * 1974-11-26 1983-11-10 BM-Elektronik Humbert Münzing, 7433 Dettingen Device for stepless control or regulation of the speed and / or the torque of a three-phase asynchronous machine
DE2757293A1 (en) * 1977-12-22 1979-06-28 Bbc Brown Boveri & Cie CONVERTER CIRCUIT

Also Published As

Publication number Publication date
SE8502166D0 (en) 1985-05-02
CH668673A5 (en) 1989-01-13
SE8502166L (en) 1985-11-12
FI851735L (en) 1985-11-12
FI851735A0 (en) 1985-05-02
DE3418020C2 (en) 1986-09-18
DE3418020A1 (en) 1985-11-21

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