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| Author: | Awan, Hafiz |
| Title: | Discrete-Time Current Control of Synchronous Motor Drives |
| Publication type: | Master's thesis |
| Publication year: | 2015 |
| Pages: | ix + 60 Language: eng |
| Department/School: | Sähkötekniikan korkeakoulu |
| Main subject: | Electrical Drives (S3016) |
| Supervisor: | Hinkkanen, Marko |
| Instructor: | Qu, Zengcai |
| Electronic version URL: | http://urn.fi/URN:NBN:fi:aalto-201504102261 |
| Location: | P1 Ark Aalto 2744 | Archive |
| Keywords: | current control discrete interior permanent-magnet synchronous motors (IPMSMs) state-space controller synchronous reluctance motors (SyRMs) two-degrees-of-freedom (2DOF) |
| Abstract (eng): | 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. |
| ED: | 2015-04-19 |
INSSI record number: 51047
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