Browsing by Author "Legesse, Mahlet"

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    Speed ControlOf Vector Controlled PMSM Drive Using Fuzzy Logic-PI Controller
    (Addis Ababa University, 2011-08) Legesse, Mahlet; Woldemariam, Wolde-Ghiorgis(Professor)
    This study is focused on the speed control performances of a Permanent Magnet Synchronous Motor (PMSM). Usually, a proportional-integral (PI) controller is used as a speed controller for a Permanent Magnet Synchronous Motor (PMSM) in high performance drive system despite the existence of many modern nonlinear control techniques. However, a PI controller is sensitive to speed changes, load disturbances and parameters variation without continuous tuning of its gains. The conventional approach to these issues is to tune the proportional and integral gains manually by observing the response of the system. The tuning of the PI parameters must be made on-line and automatic in order to avoid tedious tasks in manual control. The well-known Ziegler-Nichols method to tune the coefficients of a PI controller is very simple, but cannot guarantee to be always effective. For this reason, this thesis proposed the design of an on-line self tuning PI controller scheme using fuzzy logic controller (FLC). The performance of the proposed controller is tested through a wide range of reference speeds as well as with load variations through simulation using MATLAB/SIMULINK and Real Time Workshop (RTW) packages. The developed controller algorithm with field oriented control (FOC) is then simulated on a Texas Instruments TMS320F2812 Digital Signal Processor (DSP) device simulator. In this thesis work a FLC comprising 49 rules is proposed to improve the dynamic performance of the drive system. The simulation results show that the speed response of the proposed drive is unaffected by load torque & parameters variation. Furthermore, the developed controller works well even when the reference speed is changed to more complex trajectory, i.e., the developed controller speed regulation is unaffected by the nature of the reference speed trajectory. These shows remarkable performance improvement compared to conventional PI speed controller. Keywords: PMSM, On-line self tuning PI Controller, Fuzzy Logic, MATLAB/SIMULINK, TMS320F2812 (DSP) device simulator.