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Control Aspects for Energy-Efficient and Sensorless AC Motor Drives

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Hinkkanen, Marko, Prof., Aalto University, Department of Electrical Engineering, Finland
dc.contributor.author Qu, Zengcai
dc.date.accessioned 2015-06-18T09:00:50Z
dc.date.available 2015-06-18T09:00:50Z
dc.date.issued 2015
dc.identifier.isbn 978-952-60-6253-2 (electronic)
dc.identifier.isbn 978-952-60-6252-5 (printed)
dc.identifier.issn 1799-4942 (electronic)
dc.identifier.issn 1799-4934 (printed)
dc.identifier.issn 1799-4934 (ISSN-L)
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/16555
dc.description.abstract This research proposes control methods for improving the energy efficiency and stability of sensorless AC motor drives. The study focuses on induction motors (IMs) and synchronous reluctance motors (SyRMs). Loss-minimizing methods are developed for both IM and SyRM drives. The loss-minimizing control applies dynamic space-vector motor models which take into account hysteresis losses and eddy-current losses as well as the magnetic saturation. The minimum points of the loss function are numerically searched in order to calculate the efficiency-optimal control variable. Magnetic saturation effects can affect the energy optimization more significantly than core-loss parameters. Additionally, flux-angle and rotor-angle estimation methods in sensorless drives are also sensitive to inductance parameters. A saturation model was proposed for SyRMs using explicit power functions. The proposed model takes into account cross saturation and fulfills the reciprocity condition. In order to improve the stability of the sensorless IM drives, especially at low speeds, a gain scheduling method was proposed for a full-order flux observer. The observer gains are selected as functions of the rotor speed estimate in order to improve the damping and robustness of the closed-loop system. The observer is augmented with a stator-resistance adaptation scheme in the low-speed region. In high-speed applications with limited sampling frequency, dynamic performance of the discrete-time approximation of a continuous-time controller can dramatically decrease, and can, in the worst case, even become unstable. A discrete-time current controller was proposed for SyRMs. The current controller is designed based on the exact discrete-time motor model that includes the effects of the zero-order hold and delays. The dynamic performance and robustness are improved, especially at low sampling to fundamental frequency ratios. en
dc.format.extent 56 + app. 65
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher Aalto University en
dc.publisher Aalto-yliopisto fi
dc.relation.ispartofseries Aalto University publication series DOCTORAL DISSERTATIONS en
dc.relation.ispartofseries 85/2015
dc.relation.haspart [Publication 1]: Z. Qu, M. Ranta, M. Hinkkanen, and J. Luomi. Loss-minimizing flux level control of induction motor drives. IEEE Transactions on Industry Applications, vol. 48, issue 3, pp. 952-961, May-June 2012. DOI: 10.1109/TIA.2012.2190818
dc.relation.haspart [Publication 2]: Z. Qu, T. Tuovinen, and M. Hinkkanen. Inclusion of magnetic saturation in dynamic models of synchronous reluctance motors. In Proc. XXth International Conference on Electrical Machines (ICEM 2012), Marseille, France, Sep. 2012.
dc.relation.haspart [Publication 3]: Z. Qu and M. Hinkkanen. Loss-minimizing control of synchronous reluctance motors - a review. In Proc. IEEE International Conference on Industrial Technology (ICIT 2013), Captown, South Africa, Feb. 2013. DOI: 10.1109/ICIT.2013.6505697
dc.relation.haspart [Publication 4]: Z. Qu, T. Tuovinen, and M. Hinkkanen. Minimizing losses of a synchronous reluctance motor drive taking into account core losses and magnetic saturation. In the 16th Conference on Power Electronics and Applications, EPE’14-ECCE Europe, Lappeenranta, Finland, Aug. 2014.
dc.relation.haspart [Publication 5]: Z. Qu, M. Hinkkanen, and L. Harnefors. Gain scheduling of a fullorder observer for sensorless induction motor drives. IEEE Transactions on Industry Applications, vol. 50, issue. 6, pp. 3834-3845, Nov.-Dec. 2014. DOI: 10.1109/TIA.2014.2323482
dc.relation.haspart [Publication 6]: M. Hinkkanen, Z. Qu, H. A. A. Awan, T. Tuovinen, and F. Briz. Current control for IPMSM drives: direct discrete-time pole-placement design. In IEEE Workshop on Electrical Machines Design Control and Diagnosis (WEMDCD), Turin, Italy, Mar. 2015.
dc.subject.other Electrical engineering en
dc.title Control Aspects for Energy-Efficient and Sensorless AC Motor Drives en
dc.type G5 Artikkeliväitöskirja fi
dc.contributor.school Sähkötekniikan korkeakoulu fi
dc.contributor.school School of Electrical Engineering en
dc.contributor.department Sähkötekniikan ja automaation laitos fi
dc.contributor.department Department of Electrical Engineering and Automation en
dc.subject.keyword discrete-time control en
dc.subject.keyword energy efficiency en
dc.subject.keyword induction motor en
dc.subject.keyword magnetic saturation en
dc.subject.keyword observer en
dc.subject.keyword speed sensorless en
dc.subject.keyword stability en
dc.subject.keyword synchronous reluctance motor en
dc.identifier.urn URN:ISBN:978-952-60-6253-2
dc.type.dcmitype text en
dc.type.ontasot Doctoral dissertation (article-based) en
dc.type.ontasot Väitöskirja (artikkeli) fi
dc.contributor.supervisor Luomi, Jorma, Prof., Aalto University, Department of Electrical Engineering, Finland
dc.contributor.supervisor Hinkkanen, Marko, Prof., Aalto University, Department of Electrical Engineering, Finland
dc.opn Scelba, Giacomo, Prof., University of Catania, Italy
dc.contributor.lab Industrial Electronics and Electric Drives en
dc.rev Bojoi, Radu Iustin, Prof., Politecnico di Torino, Italy
dc.rev Wallmark, Oskar, Prof., KTH Royal Institute of Technology, Sweden
dc.date.defence 2015-07-10
local.aalto.digifolder Aalto_64729
local.aalto.formfolder 2015_06_17_klo_13_12
local.aalto.archive yes
local.aalto.digiauth ask

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