Control of synchronous motor drives with an LC filter

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dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.advisorTiitinen, Lauri
dc.contributor.authorSuran, Roman
dc.contributor.schoolSähkötekniikan korkeakoulufi
dc.contributor.supervisorHinkkanen, Marko
dc.date.accessioned2022-10-23T17:02:47Z
dc.date.available2022-10-23T17:02:47Z
dc.date.issued2022-10-17
dc.description.abstractElectric motors can experience voltage stress over the motor terminals due to the short rise time of the voltage pulse at the inverter output and the impedance mismatch between the lead cables and the motor. This overvoltage degrades the motor insulation, thus reducing the motor lifespan. The problems can be avoided by using a sinusoidal LC filter in the inverter output, limiting the overvoltage and dampening high-order harmonics. However, the existing control methods for LC-filtered synchronous motors are infeasible for plug-and-play drives, in which the motor data or user input are not required. This is because the methods either contain several cascaded control loops, require cumbersome parameter tuning, are sensitive to parameter errors, or the range of operating speeds is limited. Nevertheless, recently developed observer-based volts-per-hertz control shows advantages through relatively low sensitivity to parameter errors, simplicity and generality of the control algorithm, and reliance on common control gains for all synchronous motor types. These attributes indicate that the observer-based volts-per-hertz control can be used for medium-performance drives ensuring robust and stable operation at a wide range of speeds. This thesis develops observer-based volts-per-hertz control for synchronous motor drives with an LC filter. The two designed methods are based on two different observer types (reduced-order and full-order) with two state feedback control laws. The methods are further linearized by means of small-signal linearization, the control strategies are simulated in Simulink, and experimental measurements validate the simulations. The measurement results show a satisfactory performance of the permanent magnet synchronous motor with both methods. However, the control performance of the synchronous reluctance motor is poor when the full-order observer is used. The thesis subsequently provides several suggestions for future work improvements.en
dc.format.extent71 + 3
dc.format.mimetypeapplication/pdfen
dc.identifier.urihttps://aaltodoc.aalto.fi/handle/123456789/117341
dc.identifier.urnURN:NBN:fi:aalto-202210236127
dc.language.isoenen
dc.locationP1fi
dc.programmeAEE - Master’s Programme in Automation and Electrical Engineering (TS2013)fi
dc.programme.majorElectrical Power and Energy Engineeringfi
dc.programme.mcodeELEC3024fi
dc.subject.keywordLC filteren
dc.subject.keywordsynchronous motoren
dc.subject.keywordV/Hz controlen
dc.subject.keywordobserveren
dc.subject.keywordstate feedbacken
dc.subject.keywordsensorlessen
dc.titleControl of synchronous motor drives with an LC filteren
dc.typeG2 Pro gradu, diplomityöfi
dc.type.ontasotMaster's thesisen
dc.type.ontasotDiplomityöfi
local.aalto.electroniconlyyes
local.aalto.openaccessyes
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