SE457132B - COMPLETE VOLTAGE LIMIT CIRCUIT AT A THREE-PHASE SYNC MACHINE - Google Patents
COMPLETE VOLTAGE LIMIT CIRCUIT AT A THREE-PHASE SYNC MACHINEInfo
- 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
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
- H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
- H02M7/72—Conversion 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
- H02M7/75—Conversion 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
- H02M7/757—Conversion 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)
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)
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)
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 |
-
1984
- 1984-05-11 DE DE19843418020 patent/DE3418020C2/en not_active Expired
-
1985
- 1985-05-02 FI FI851735A patent/FI851735L/en not_active Application Discontinuation
- 1985-05-02 SE SE8502166A patent/SE457132B/en not_active IP Right Cessation
- 1985-05-07 CH CH194085A patent/CH668673A5/en not_active IP Right Cessation
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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