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Analysis and Control Aspects of Brushless Induction Machines with Rotating Power Electronic Converters
KTH, School of Electrical Engineering (EES), Electrical Energy Conversion. (Electrical Machines)
2012 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis deals with the steady-state, dynamic and control aspects of new type of brushless configuration of a doubly-fed induction machine in which the slip rings and carbon brushes are replaced by rotating power electronics and a rotating exciter. The aim is to study the stability of this novel configuration of the generator under mechanical and grid disturbances for wind power applications.

The derivation, development and analysis of the steady-state model of the brushless doubly-fed induction machine with a rotating excitor and the power electronic converters mounted on the shaft and rotating with it, is studied. The study is performed at rated power of the generator between ±20% slip range. Moreover unity power factor operation between ±20% speed range is also discussed.

Furthermore dynamic modeling and control aspects of the generator are also analyzed. The controllers were designed using Internal Model Control principles and vector control methods were used in order to control the generator in a closed-loop system. It is shown that through the use of proper feedback control, the generator behaves in a stable state both at super-synchronous and sub-synchronous speeds.

Moreover Low Voltage Ride Through of the generator during symmetrical and unsymmetrical voltage dips is also investigated. Passive Resistive Network strategy is employed for Low Voltage Ride Through of the generator during symmetrical voltage dips. On the other hand, Extended Vector Control is used in order to control the negative sequence currents during unsymmetrical voltage dips. Suppression of negative sequence currents is important as they cause extra heating in the windings and affects the lifetime of the mechanical and electrical components of the generator and system due to oscillations in power and torque.

In addition to the above studies a steady-state model of a single-fed induction machine is also developed and investigated where the rotating exciter is removed and the rotor windings are short-circuited through the two rotating power electronic converters. In this way the slip power circulates in the rotor and with the help of the two rotating electronic converters, rotor current is used to magnetize the induction machine thereby improving the power factor. The steady state model is verified through experimental results.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2012. , viii, 70 p.
Series
Trita-EE, ISSN 1653-5146 ; 2012:037
Keyword [en]
Doubly-fed induction generator, extended vector control, induction machine, internal model control, Lindmark concept, low voltage ride through, passive resistive network, rotating power electronic converter, rotating exciter, symmetrical faults, synchronous machine, unity power factor, unsymmetrical faults, vector control, wind turbines.
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Järnvägsgruppen - Elsystem
Identifiers
URN: urn:nbn:se:kth:diva-102210ISBN: 978-91-7501-466-1 (print)OAI: oai:DiVA.org:kth-102210DiVA: diva2:551539
Presentation
2012-10-01, H1, Lab of Electrical Energy Conversion,, Teknikringen 33 KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Projects
Brushless Wind Generator with Rotating Power Electronic Converters
Note

20120914

Available from: 2012-09-14 Created: 2012-09-11 Last updated: 2012-09-14Bibliographically approved
List of papers
1. Brushless Doubly-fed Induction Machine with Rotating Power Electronic Converter for Wind Power Applications
Open this publication in new window or tab >>Brushless Doubly-fed Induction Machine with Rotating Power Electronic Converter for Wind Power Applications
2011 (English)In: Electrical Machines and Systems (ICEMS), 2011 International Conference on , vol., no., pp.1-6, 20-23 Aug. 2011, IEEE conference proceedings, 2011Conference paper, Published paper (Refereed)
Abstract [en]

This paper introduces, simulates and analyzes a new topology of a brushless doubly-fed induction machine with rotating power electronic converter for wind power applications. Topology consists of two machines, one is the main machine which is directly connected to the grid while the second machine is the auxiliary machine which handles the slip power. The rotor of the two machines are connected via a power electronic converter which is mounted on the shaft and rotates with it. The steady state equivalent circuit of the two machine configuration is developed and analyzed. It is shown through simulations that the stator terminals of the machine can be operated at a unity power factor for variable speed range. Furthermore, it is shown that the presented system operates at a high efficiency at rated load and unity power factor.

Place, publisher, year, edition, pages
IEEE conference proceedings, 2011
Keyword
auxiliary machine, brushless doubly-fed induction machine, rotating power electronic converter, slip power, stator terminals, steady state equivalent circuit, unity power factor, wind power
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Järnvägsgruppen - Elsystem
Identifiers
urn:nbn:se:kth:diva-102207 (URN)10.1109/ICEMS.2011.6073422 (DOI)2-s2.0-83355167129 (Scopus ID)978-1-4577-1044-5 (ISBN)
Conference
International Conference on Electrical Machines and Systems (ICEMS), 2011
Projects
Brushless Wind Generator with Rotating Power Electronic Converters
Note

QC 20120912

Available from: 2012-09-11 Created: 2012-09-11 Last updated: 2015-10-06Bibliographically approved
2. Dynamic Modeling and Control of a Brushless Doubly-Fed Induction Generator with a Rotating Power Electronic Converter
Open this publication in new window or tab >>Dynamic Modeling and Control of a Brushless Doubly-Fed Induction Generator with a Rotating Power Electronic Converter
2012 (English)In: Electrical Machines (ICEM), 2012 XXth International Conference on, IEEE , 2012, 900-906 p.Conference paper, Published paper (Refereed)
Abstract [en]

A different configuration of brushless doubly-fed induction generator is presented. The power electronic converters are mounted on the rotor rotating with it. The slip rings and carbon brushes are replaced by a rotating exciter which serves as a slip recovery device as well as a means of providing excitation to the rotor of the induction generator. The dynamic model of the brushless topology is derived and analyzed. Furthermore, feedback control of the topology is also implemented and analyzed. It is shown that the generator shows stable operation in steady state as well as in dynamic state at variable speeds.

Place, publisher, year, edition, pages
IEEE, 2012
Keyword
Brushless Doubly-Fed Induction Generator, rotating power electronic IGBT converter, rotating exciter, slip power, variable speed operation, vector control
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-102269 (URN)10.1109/ICElMach.2012.6349983 (DOI)000333806700136 ()2-s2.0-84870806512 (Scopus ID)978-146730142-8 (ISBN)
Conference
2012 20th International Conference on Electrical Machines, ICEM 2012; Marseille; 2 September 2012 through 5 September 2012
Note

QC 20120912

Available from: 2012-09-12 Created: 2012-09-12 Last updated: 2015-10-06Bibliographically approved
3. Behavior of a brushless doubly-fed induction generator with a rotating power electronic converter during symmetrical voltage sags
Open this publication in new window or tab >>Behavior of a brushless doubly-fed induction generator with a rotating power electronic converter during symmetrical voltage sags
2012 (English)In: Proceedings - 2012 20th International Conference on Electrical Machines, ICEM 2012, IEEE , 2012, 865-871 p.Conference paper, Published paper (Refereed)
Abstract [en]

Impact of the different magnitudes of symmetrical voltage dip on the performance of a Rotating Power Electronic Brushless Doubly-Fed Induction Generator is presented. This type of topology consists of a doubly-fed induction generator with power electronic converter and an integrated exciter mounted on the shaft and rotating with it. The transient simulation study is carried out in order to investigate the magnitude of the voltage dip the rotor converters can withstand before a protection scheme is needed for Low Voltage Ride Through (LVRT) of the generator. Furthermore, successful LVRT under severe voltage dips is also performed using passive resistive network strategy.

Place, publisher, year, edition, pages
IEEE, 2012
Keyword
Brushless Doubly-Fed Induction Generator, grid code, LVRT, passive resistive network, rotating power electronic converter, voltage dip, vector control
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-102271 (URN)10.1109/ICElMach.2012.6349978 (DOI)000333806700131 ()2-s2.0-84870835336 (Scopus ID)978-146730142-8 (ISBN)
Conference
2012 20th International Conference on Electrical Machines, ICEM 2012; Marseille; 2 September 2012 through 5 September 2012
Note

QC 20120912

Available from: 2012-09-12 Created: 2012-09-12 Last updated: 2015-10-06Bibliographically approved
4. Extended Vector Control of a Rotating Power Electronic Brushless Doubly-Fed Induction Generator under Unsymmetrical Voltage Sags
Open this publication in new window or tab >>Extended Vector Control of a Rotating Power Electronic Brushless Doubly-Fed Induction Generator under Unsymmetrical Voltage Sags
2012 (English)In: IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society, IEEE , 2012, 1793-1798 p.Conference paper, Published paper (Refereed)
Abstract [en]

This paper presents the implementation of the extended vector control on a new type of brushless doubly-fed generator when subjected to unsymmetrical voltage dips. This new type of generator has partially rated power electronic converter and exciter mounted on the shaft and rotating with it. The unbalanced voltages introduce positive and negative sequence components in the generator. The negative sequence components gives rise to torque oscillations and extra heating in the generator and power electronics which could affect the life time of the shaft, gearbox and electronic equipment. Two separate synchronous reference frames are defined and standard PI controllers are implemented in the reference frames in order to control the positive and negative sequence currents independently. Through these means the effect of the negative sequence currents is mitigated and it is shown that the oscillations in the behavior of this new type of generator are considerably reduced.

Place, publisher, year, edition, pages
IEEE, 2012
Series
IEEE Industrial Electronics Society. Annual Conference. Proceedings, ISSN 1553-572X
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-102272 (URN)10.1109/IECON.2012.6388929 (DOI)000316962901130 ()2-s2.0-84872965211 (Scopus ID)978-146732421-2 (ISBN)
Conference
38th Annual Conference on IEEE Industrial Electronics Society, IECON 2012; Montreal, QC; 25 October 2012 through 28 October 2012
Note

QC 20120912

Available from: 2012-09-12 Created: 2012-09-12 Last updated: 2015-10-06Bibliographically approved
5. Induction Machine at Unity Power Factor with Rotating Power Electronic Converter
Open this publication in new window or tab >>Induction Machine at Unity Power Factor with Rotating Power Electronic Converter
2012 (English)Conference paper, Published paper (Refereed)
Abstract [en]

A new configuration for the self-excitation of the induction machine invented by Magnus Lindmark is presented. The power electronic converter using solid state switches is connected to the rotor while the stator is directly connected to the grid. Using appropriate control, the reactive power consumed by the motor can be generated in the rotor resulting in unity power factor operation. The rotor connected power electronic converter is also used for constant speed operation of the induction machine at variable torque.

Place, publisher, year, edition, pages
Sorrento: IEEE conference proceedings, 2012
Keyword
constant speed operation, induction machine self-excitation, reactive power, rotating power electronic converter, rotor connected power electronic converter, solid state switches, stator, unity power factor, variable torque
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Järnvägsgruppen - Elsystem
Identifiers
urn:nbn:se:kth:diva-102208 (URN)10.1109/SPEEDAM.2012.6264391 (DOI)2-s2.0-84866904144 (Scopus ID)978-1-4673-1299-8 (ISBN)
Conference
International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM)
Projects
Brushless Wind Generator with Rotating Power Electronic Converter
Note

QC 20120912

Available from: 2012-09-11 Created: 2012-09-11 Last updated: 2015-10-06Bibliographically approved
6. Theoretical and Experimental Investigation of the Self-Excited Rotating Power Electronic Induction Machine
Open this publication in new window or tab >>Theoretical and Experimental Investigation of the Self-Excited Rotating Power Electronic Induction Machine
2011 (English)In: IECON 2011: 37TH ANNUAL CONFERENCE ON IEEE INDUSTRIAL ELECTRONICS SOCIETY, 2011, 2048-2053 p.Conference paper, Published paper (Refereed)
Abstract [en]

This paper presents the theoretical model and analysis of a novel topology of the self-excited induction machine using rotating power electronic converters. The power electronic converters are connected to the rotor of the induction machine and it is shown that the machine operates at unity power factor at variable load conditions including rated load. Special control strategy of the two converters helps in magnetization of the induction machine from the rotor. The experimental analysis is conducted in the industry using 11kW induction machine and close agreement is found between the theoretical model and the experimental results. Besides, the rotor resistance is varied and its effect on the power factor and performance of the machine is studied and analyzed.

Series
IEEE Industrial Electronics Society, ISSN 1553-572X
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-92076 (URN)000299032402041 ()2-s2.0-84856551666 (Scopus ID)978-1-61284-972-0 (ISBN)
Conference
ICELIE/IES Industry Forum/37th Annual Conference of the IEEE Industrial-Electronics-Society (IECON) NOV 07-10, 2011 Melbourne, AUSTRALIA
Note
QC 20120326Available from: 2012-03-26 Created: 2012-03-26 Last updated: 2015-10-06Bibliographically approved

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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
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  • text
  • asciidoc
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