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Analysis of an induction machine using a rotor integrated converter with a floating capacitor
KTH, School of Electrical Engineering (EES), Electric power and energy systems. (Electrical Machines and Drives Laboratory)ORCID iD: 0000-0003-2398-8528
KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
2015 (English)In: Electrical Machines and Systems (ICEMS), 2015 18th International Conference on, IEEE , 2015, 1851-1857 p.Conference paper, Published paper (Refereed)
Abstract [en]

A novel topology of induction machine with a rotor integrated converter with a floating capacitor is investigated in this paper. The stator windings of the induction machine are directly connected to the grid. While the rotor windings are connected to a converter with a floating capacitor. The steady state mathematical model is presented and used to predict the operating range of the induction machine. The result shows that the induction machine can operate in a wide torque and speed range instead of working on the original torque-speed curve. In addition, the relationship between capacitance and capacitor voltage is studied for the constant speed and variable load operation. It is shown that it is possible to choose a low volume and high capacitance capacitor since the average DC-link voltage is quite low.

Place, publisher, year, edition, pages
IEEE , 2015. 1851-1857 p.
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electrical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-185009DOI: 10.1109/ICEMS.2015.7385342ISI: 000381470800355Scopus ID: 2-s2.0-84966601409ISBN: 978-1-4799-8805-1 (print)OAI: oai:DiVA.org:kth-185009DiVA: diva2:917904
Conference
Electrical Machines and Systems (ICEMS), 2015 18th International Conference, 25-28 Oct. 2015, Pattaya, Thailand
Note

QC 20160408

Available from: 2016-04-08 Created: 2016-04-08 Last updated: 2017-01-11Bibliographically approved
In thesis
1. Study of Induction Machines with Rotating Power Electronic Converter
Open this publication in new window or tab >>Study of Induction Machines with Rotating Power Electronic Converter
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis investigates a novel induction machine topology that uses a rotating power electronic converter. Steady-state and dynamic performance of the topology is studied to understand its operational principle. Furthermore the potential of improving its efficiency and power factor is investigated. The topology is referred to as wound rotor induction machine with rotating power electronic converter (WRIM-RPEC).

    The WRIM-RPEC topology offers the possibility to magnetize the induction machine from the rotor side by introducing a reactive voltage in the rotor. Thus, the power factor of the machine can be improved. Constant speed variable load operation can be achieved by setting the frequency of the introduced voltage. Two options of rotor winding and converter configuration in the WRIM-RPEC system are investigated. The wound rotor windings can either be open-ended and fed by a three-phase back-to-back converter or Y-connected and fed by a single three-phase converter. The dc-link in both converter configurations contains only a floating capacitor. These two configurations give different dc-link voltages at the same torque and speed.

    Two analytical steady-state models of the topology are developed in this thesis. The first model can be used to analyze the operating condition of the motor at specific speed and torque. Particularly, the operating range of speed and torque of the topology is investigated. The second model is used to analyze variable power factor operation, including unity power factor operation. Analytical calculations and measurements are carried out on a 4-pole, 1.8kW induction machine and the results are compared.

     A dynamic mathematic model is then developed for the WRIM-RPEC system for the back-to-back converter configuration. The mathematic model is then applied in Matlab/Simulink to study the dynamic performance of the system including starting, loading and phase-shifting. The simulation results are compared with measurements on the 4-pole, 1.8kW induction machine. Moreover, the simulation model using the existing Simulink blocks are studied to compare with the results obtained from the mathematic model. Furthermore, the dynamic performance of the WRIM-RPEC system with the single converter configuration is investigated. In addition, harmonic spectra analysis is conducted for the stator and rotor currents.

    In the last part of the thesis, efficiency improvement is investigated on the 4-pole induction machine when it is assumed to drive a pump load. It is shown that the efficiency can be further improved by decreasing the rotor resistance. Due to space constraints it is however difficult to decrease the rotor resistance in a 4-pole induction machine. An investigation is thus carried out on a standard 12-pole, 17.5kW squirrel-cage induction machine with inherent low power factor. The cage rotor is redesigned to a wound rotor to enable the connection of converter to the rotor windings. An analytical model is developed to design the wound rotor induction machine. The machine performance from calculations is then compared with FEM simulations with good agreement. The analytical model is further used to design several WRIMs with different dimensions and rotor slot numbers. Power factor and efficiency improvement is then explored for these WRIMs. A promising efficiency increase of 6.8% is shown to be achievable.

Place, publisher, year, edition, pages
Stockholm: Kungliga Tekniska högskolan, 2016. 59 p.
Series
TRITA-EE, ISSN 1653-5146 ; 2016:168
Keyword
Brushless induction machine, efficiency improvement, optimum efficiency, rotating power electronic converter, unity power factor, variable power factor, wound rotor induction machine
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electrical Engineering
Identifiers
urn:nbn:se:kth:diva-196054 (URN)978-91-7729-166-4 (ISBN)
Public defence
2016-12-09, Kollegiesalen, Brinellvägen 8, Stockholm, 09:00 (English)
Opponent
Supervisors
Note

QC 20161111

Available from: 2016-11-11 Created: 2016-11-10 Last updated: 2016-11-11Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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