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Dynamic Modeling and Control of a Brushless Doubly-Fed Induction Generator with a Rotating Power Electronic Converter
KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
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. 900-906 p.
Keyword [en]
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: urn:nbn:se:kth:diva-102269DOI: 10.1109/ICElMach.2012.6349983ISI: 000333806700136Scopus ID: 2-s2.0-84870806512ISBN: 978-146730142-8 (print)OAI: oai:DiVA.org:kth-102269DiVA: diva2:551962
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
In thesis
1. Analysis and Control Aspects of Brushless Induction Machines with Rotating Power Electronic Converters
Open this publication in new window or tab >>Analysis and Control Aspects of Brushless Induction Machines with Rotating Power Electronic Converters
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
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:nbn:se:kth:diva-102210 (URN)978-91-7501-466-1 (ISBN)
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
2. Modelling, Analysis, and Control Aspects of a Rotating Power Electronic Brushless Doubly-Fed Induction Generator
Open this publication in new window or tab >>Modelling, Analysis, and Control Aspects of a Rotating Power Electronic Brushless Doubly-Fed Induction Generator
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis deals with the modeling, analysis and control of a novel brushlessgenerator for wind power application. The generator is named as rotatingpower electronic brushless doubly-fed induction machine/generator (RPEBDFIM/G).

A great advantage of the RPE-BDFIG is that the slip power recoveryis realized in a brushless manner. This is achieved by introducing an additionalmachine termed as exciter together with the rotating power electronicconverters, which are mounted on the shaft of a DFIG. It is shown that theexciter recovers the slip power in a mechanical manner, and delivers it backto the grid. As a result, slip rings and carbon brushes can be eliminated,increasing the robustness of the system, and reducing the maintenance costsand down-time of the turbine.

To begin with, the dynamic model of the RPE-BDFIG is developed andanalyzed. Using the dynamic model, the working principle of the generatoris understood and its operation explained. The analysis is carried out atspeeds, ±20% around the synchronous speed of the generator. Moreover, thedynamics of the generator due to external load-torque disturbances are investigated.Additionally, the steady-state model is also derived and analyzed forthe machine, when operating in motor mode.

As a next step, the closed-loop control of the generator is considered indetail. The power and speed control of the two machines of the generator andthe dc-link voltage control is designed using internal model control (IMC)principles. It is found that it is possible to maintain the stability of thegenerator against load-torque disturbances from the turbine and the exciter,at the same time maintain a constant dc-link voltage of the rotor converter.The closed-loop control is also implemented and the operation of the generatorwith the control theory is confirmed through experiments.In the third part of the thesis, the impact of grid faults on the behaviourof the generator is investigated. The operation of the generator and its responseis studied during symmetrical and unsymmetrical faults. An approachto successful ride through of the symmetrical faults is presented, using passiveresistive network (PRN). Moreover, in order to limit the electrical and mechanicaloscillations in the generator during unsymmetrical faults, the dualvector control (DVC) is implemented. It is found that DVC to a certain extentcan be used to safeguard the converter against large oscillations in rotorcurrents.

Finally, for completeness of the thesis, a preliminary physical design ofthe rotating power electronic converter has been done in a finite elementsoftware called ANSYS. The thermal footprint and the cooling capability,with estimates of the heatsink and fan sizes, are presented.

Besides, another variant of a rotating electronic induction machine whichis based on the Lindmark concept and operating in a single-fed mode is also investigated. It’s steady-state model is developed and verified through experiments.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2015. xi, 85 p.
Series
TRITA-EE, ISSN 1653-5146 ; 2015:63
Keyword
Brushless doubly-fed induction generator, dual vector control, dynamic model, induction machine, internal model control, Lindmark concept, low-voltage ride-through, passive resistive network, rotating power electronic converter, rotating exciter, symmetrical faults, synchronous machine, thermal model, unity power factor, unsymmetrical faults, vector control, wind turbines.
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electrical Engineering; Energy Technology
Identifiers
urn:nbn:se:kth:diva-174349 (URN)978-91-7595-691-6 (ISBN)
Public defence
2015-10-19, F3, Lindstedtsvägen 26, KTH, Stockholm, 20:23 (English)
Opponent
Supervisors
Note

QC 20151006

Available from: 2015-10-06 Created: 2015-10-05 Last updated: 2015-10-06Bibliographically approved

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