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Voltage sag ride-through of AC drives: control and analysis
KTH, School of Electrical Engineering (EES).
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. , p. 51
Series
Trita-ETS, ISSN 1650-674X ; 2005.12
National Category
Control Engineering
Identifiers
URN: urn:nbn:se:kth:diva-450ISBN: 91-7178-165-X (print)OAI: oai:DiVA.org:kth-450DiVA, id: diva2:12572
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
List of papers
1. Unified Sensorless Vector Control of Synchronous and Induction Motors
Open this publication in new window or tab >>Unified Sensorless Vector Control of Synchronous and Induction Motors
2003 (English)In: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948, IEEE transactions on industrial electronics, Vol. 50, no 1, p. 153-160Article in journal (Refereed) Published
Abstract [en]

In this paper, a unified theory for sensorless fluxestimation and vector control of induction motors and nonsalientpermanent-magnet synchronous motors (PMSMs) is developed.It is shown that an estimator and vector controller for one of themotor types can also be applied to the other, with only minormodifications necessary. Two candidate estimators are considered:a variant of the well-known “voltage model” (VM) and aphase-locked-loop-type speed and position estimator. These areapplied to both motor types, and evaluated experimentally. Forthe nonsalient PMSM, an important result is that synchronizationcan be guaranteed from any initial rotor position.

Keywords
Flux estimation, induction motor (IM), permanent- magnet synchronous motor (PMSM), sensorless control.
National Category
Control Engineering
Identifiers
urn:nbn:se:kth:diva-7517 (URN)10.1109/TIE.2002.807653 (DOI)000180713800018 ()
Note

QC 20101012

Available from: 2005-10-17 Created: 2005-10-17 Last updated: 2017-12-14Bibliographically approved
2. Torque-Maximizing Field-Weakening Control: Design, Analysis, and Parameter Selection
Open this publication in new window or tab >>Torque-Maximizing Field-Weakening Control: Design, Analysis, and Parameter Selection
2001 (English)In: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948, Vol. 48, no 1, p. 161-168Article 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.

Keywords
Current control, field weakening, induction motor, speed control
National Category
Control Engineering
Identifiers
urn:nbn:se:kth:diva-7518 (URN)10.1109/41.904576 (DOI)000167163500018 ()
Note
QC 20101012Available from: 2005-10-17 Created: 2005-10-17 Last updated: 2017-12-14Bibliographically approved
3. Voltage Sag Ride-Through of Induction Motor Drives
Open this publication in new window or tab >>Voltage Sag Ride-Through of Induction Motor Drives
2002 (English)In: NORPIEArticle in journal (Refereed) Published
National Category
Control Engineering
Identifiers
urn:nbn:se:kth:diva-7519 (URN)
Note
CD-ROM QC 20101012Available from: 2005-10-17 Created: 2005-10-17 Last updated: 2010-10-12Bibliographically approved
4. Voltage Sag Ride-Through for Line-Connected Syn-chronous Motors Through Flux Control
Open this publication in new window or tab >>Voltage Sag Ride-Through for Line-Connected Syn-chronous Motors Through Flux Control
2003 (English)In: PEDS 2003 : FIFTH INTERNATIONAL CONFERENCE ON POWER ELECTRONICS AND DRIVE SYSTEMS, VOLS 1 AND 2, PROCEEDINGS / [ed] Tseng, K.J., 2003, Vol. 2, p. 1219-1223Conference paper, Published paper (Refereed)
Abstract [en]

In this paper, the voltage sag ride-through capabilities of the line-connected electrically excited synchronous motors with damper windings (EESMs) is investigated. Two aspects are investigated, first the capability to keep the nominal speed and second the damping of speed oscillations by controlling the flux. We will design a voltage sag ride-through controller and show through simulations that the proposed controller has good speed oscillation damping capability and that the ride-through capability is improved.

Series
International Conference on Power Electronics and Drive Systems PEDS
Keywords
power quality, protection and control, synchronous machine, voltage sag ride-through
National Category
Control Engineering
Identifiers
urn:nbn:se:kth:diva-7520 (URN)000223102300230 ()
Conference
5th IEEE International Conference on Power Electronics and Drive Systems (PEDS 2003) Singapore, SINGAPORE, NOV 17-20, 2003
Note

QC 20101012

Available from: 2005-10-17 Created: 2005-10-17 Last updated: 2013-12-06Bibliographically approved
5. DC-Link Stabilization and Voltage Sag Ride-Through of Inverter Drives
Open this publication in new window or tab >>DC-Link Stabilization and Voltage Sag Ride-Through of Inverter Drives
2006 (English)In: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948, Vol. 53, no 4, p. 1261-1268Article in journal (Refereed) Published
Abstract [en]

Previous results concerning instability of the dc linkin inverter drives fed from a dc grid or via a rectifier are extended.It is shown that rectifier–inverter drives equipped with small (film)dc-link capacitors may need active stabilization. The impact oflimited bandwidth and switching frequency in the inverter–motorcurrent control loop is considered, and recommendations forselection of the dc-link capacitor, the switching frequency, andthe dc-link stabilization control law in relation to each other aregiven. This control law is incorporated in a field-weakening (toenhance voltage sag ride-through) current controller for whichdesign recommendations are presented.

Keywords
Active stabilization, field weakening, induction motor, variable-speed drive, voltage sag ride-through.
National Category
Control Engineering
Identifiers
urn:nbn:se:kth:diva-7521 (URN)10.1109/TIE.2006.878308 (DOI)000239554200027 ()2-s2.0-33747617571 (Scopus ID)
Note
Uppdaterad från Accepted till Published: 20101012. QC 20101012Available from: 2005-10-17 Created: 2005-10-17 Last updated: 2017-12-14Bibliographically approved
6. Voltage Sag Response of PWM Rectifiers in Full-Power Variable Speed Wind Turbines
Open this publication in new window or tab >>Voltage Sag Response of PWM Rectifiers in Full-Power Variable Speed Wind Turbines
2004 (English)Conference paper, Published paper (Refereed)
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-7522 (URN)
Note
QC 20111216Available from: 2005-10-17 Created: 2005-10-17 Last updated: 2011-12-16Bibliographically approved

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Citation style
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