Discrete-Time Current Control of Synchronous Motor Drives

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Qu, Zengcai
dc.contributor.author Awan, Hafiz
dc.date.accessioned 2015-04-09T11:37:52Z
dc.date.available 2015-04-09T11:37:52Z
dc.date.issued 2015-03-30
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/15605
dc.description.abstract The aim of this thesis is to analyze discrete-time models and current control of synchronous motors with a magnetically anisotropic rotor structure, such as interior permanent-magnet synchronous motors (IPMSMs) and synchronous reluctance motors (SyRMs). Current regulators in most modern electrical drives are implemented in digital processors. Discretization of continuous-time controllers using the Euler and Tustin approximations, also known as the emulation-based design, is the most common approach. This design gives satisfactory results when the ratio between the sampling and fundamental frequencies remains high. The performance of the emulation-based design deteriorates as the frequency ratio becomes small. For this reason, the controller based on the exact discrete-time model of the machine is preferred. If the exact expressions are computationally too demanding, approximate expressions (series expansions) could be used instead. A hold equivalent discrete-time model with the effects of the zero-order hold (ZOH) and a sampler is studied in both the stator and rotor coordinates. A two-degrees-of-freedom (2DOF) state-space controller is used with the gains based on the exact discrete-time model of the motor. The results are compared with the emulation- and series expansions (of the exact discrete-time model) based controllers. The robustness of these methods against parameter errors is analyzed and the current controllers are also investigated by performing simulations and experiments on a 6.7-kW SyRM drive. en
dc.format.extent 60+9
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.title Discrete-Time Current Control of Synchronous Motor Drives en
dc.type G2 Pro gradu, diplomityö en
dc.contributor.school Sähkötekniikan korkeakoulu fi
dc.subject.keyword current control en
dc.subject.keyword discrete en
dc.subject.keyword interior permanent-magnet synchronous motors (IPMSMs) en
dc.subject.keyword state-space controller en
dc.subject.keyword synchronous reluctance motors (SyRMs) en
dc.subject.keyword two-degrees-of-freedom (2DOF) en
dc.identifier.urn URN:NBN:fi:aalto-201504102261
dc.programme.major Electrical Drives fi
dc.programme.mcode S3016 fi
dc.type.ontasot Master's thesis en
dc.type.ontasot Diplomityö fi
dc.contributor.supervisor Hinkkanen, Marko
dc.programme EST - Master’s Programme in Electrical Engineering fi
dc.location P1 fi

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