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Torque-Maximizing Field-Weakening Control: Design, Analysis, and Parameter Selection
2001 (English)In: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, Vol. 48, no 1, 161-168 p.Article in journal (Refereed) Published
Abstract [en]

The torque-maximizing field-weakening controlscheme proposed by Kim and Sul is developed further. Theperformance under imperfect field orientation conditions isinvestigated, and it is shown that an overestimated—rather thanan underestimated—model leakage inductance should be used. Aslightly modified algorithm, which offers better robustness andreduced computational complexity, is presented. The importance,for good performance, of combining the scheme with currentand speed controllers featuring antiwindup and improved disturbancerejection is emphasized. The dynamics of the resultingclosed-loop system are analyzed. Obtained in the process are rulesfor selection of all controller parameters, allowing tuning withouttrial-and-error steps. Good performance of the resulting systemis verified experimentally.

Place, publisher, year, edition, pages
2001. Vol. 48, no 1, 161-168 p.
Keyword [en]
Current control, field weakening, induction motor, speed control
National Category
Control Engineering
Identifiers
URN: urn:nbn:se:kth:diva-7518DOI: 10.1109/41.904576ISI: 000167163500018OAI: oai:DiVA.org:kth-7518DiVA: diva2:12567
Note
QC 20101012Available from: 2005-10-17 Created: 2005-10-17 Last updated: 2011-12-16Bibliographically approved
In thesis
1. Voltage sag ride-through of AC drives: control and analysis
Open this publication in new window or tab >>Voltage sag ride-through of AC drives: control and analysis
2005 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

This thesis focuses on controller design and analysis for induction motor (IM) drives, flux control for electrically excited synchronous motors with damper windings (EESMs), and to enhance voltage sag ride-through ability and analysis for a wind turbine application with a full-power grid-connected active rectifier. The goal is to be able to use the existing equipment, without altering the hardware. Further, design and analysis of the stabilization of DC-link voltage oscillations for DC systems and inverter drives is studied, for example traction drives with voltage sags in focus.

The proposed IM controller is based on the field-weakening controller of Kim and Sul [31], which is further developed. Applying the proposed controller to voltage sag ride-through gives a cheap and simple ride-through system.

The EESM controller is based on setpoint adjustment for the field current controller. The analysis also concerns stability for the proposed flux controller.

The DC-link stabilization algorithm is designed following Mosskull [38], where a component is added to the current controller. The algorithm is further developed.

Analysis is the main focus, and concerns the impact of the different parameters involved. Proper parameter selection for the controller, switching frequency, and DC-link capacitor is given.

The impact of voltage sags is investigated for a power-grid-connected rectifier. Here, we analyze the impact of different types of voltage sags and phase-angle jumps. The analysis gives design rules for the DC-link capacitor and the switching frequency.

Experimental results and simulations verify the theoretical results.

Place, publisher, year, edition, pages
Stockholm: KTH, 2005. 51 p.
Series
Trita-ETS, ISSN 1650-674X ; 2005.12
National Category
Control Engineering
Identifiers
urn:nbn:se:kth:diva-450 (URN)91-7178-165-X (ISBN)
Public defence
2005-10-20, Sal D3, Lindstedtsvägen 5, Stockholm, 10:15
Opponent
Supervisors
Note
QC 20101012Available from: 2005-10-17 Created: 2005-10-17 Last updated: 2011-12-16Bibliographically approved

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Publisher's full texthttp://ieeexplore.ieee.org/iel5/41/19570/00904576.pdf?isnumber=19570&prod=JNL&arnumber=904576&arSt=161&ared=168&arAuthor=Harnefors%2C+L.%3B+Pietilainen%2C+K.%3B+Gertmar%2C+L.

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