Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Stabilization of an induction machine drive
KTH, Superseded Departments, Signals, Sensors and Systems.
2003 (English)Licentiate thesis, monograph (Other scientific)
Abstract [en]

Modern electric trains almost exclusively use inductionmachines fed by voltage source inverters for propulsion. Toreduce external as well as internal disturbances, an LC-filteris inserted between the input terminals of the drive and theinverter. In connection with efficient torque control of themotors, these filters however potentially make the driveunstable as excitations of the filter resonance are amplifiedby the torque control. The solution to such stability problemsusually is to modify the torque reference according tooscillations in the inverter input voltage. Although thisstrategy may be motivated from simple models of the closed loopdrive, structured tuning of this feed-forward compensation ismore difficult. Experience shows that the compensation must notonly be adapted to the varying dynamics of the drive, but alsoproperties of the torque control and applied inverter pulsepatterns must be considered.

This thesis derives an expression for the feedforwardcompensation stabilizing the drive in terms of the operatingconditions. These conditions include the motor speed, operatingpoint torque and flux as well the actual DC-link voltage andtime delays of the torque control. From an equivalent feedbackrepresentation of the drive, the stabilization problem is firstinterpreted as appropriately shaping the inverter inputadmittance. The exact shape of the compensation meeting thedesign requirements is then derived using linear models of thedrive, including control. The derived linear models are alsoused to obtain tuning rules for the torque and flux controllerparameters, given requirements on bandwidth and stabilitymargins. It is assumed that torque is controlled using themethod Indirect Self Control.

Stability of the closed-loop drive with the proposedstabilization is validated from measurements. Using modelsobtained from frequency domain system identification, stabilityof the non-linear closed-loop drive is verified by combiningstability results for linear systems with the small gaintheorem for the non-linear model errors.

Place, publisher, year, edition, pages
Stockholm: Signaler, sensorer och system , 2003. , x, 175 p.
Series
Trita-S3-REG, 0301
Identifiers
URN: urn:nbn:se:kth:diva-1605OAI: oai:DiVA.org:kth-1605DiVA: diva2:7532
Note
NR 20140805Available from: 2003-08-04 Created: 2003-08-04Bibliographically approved

Open Access in DiVA

fulltext(3259 kB)3483 downloads
File information
File name FULLTEXT01.pdfFile size 3259 kBChecksum MD5
4c715456312701d17e9450de1812771d1bd1db6d4c7304682ae759d58b4187e29edf85e9
Type fulltextMimetype application/pdf

By organisation
Signals, Sensors and Systems

Search outside of DiVA

GoogleGoogle Scholar
Total: 3483 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 670 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf