Design and Implementation of High Performance Predictive Current Controller for Vector Drives
| Autor: | Chih-Chien Chou, 周至鍵 |
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| Rok vydání: | 2006 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 94 The purpose of this study is to develop a high performance current controller and to achieve better response and bandwidth which could highly improve the speed and accuracy of servo systems. In this thesis we implement Permanent Magnet Synchronous Motor (PMSM) current loop control using ANCA Computer Numerical Control (CNC) and the Texas Instrument Digital Signal Processor (DSP) TMS320C32. Two current controllers are used：Proportional-Integral (PI) controller and Predictive Controller. Proportional-Integral controller has a very simple structure and easy to implement. However, the performance achievable is limited. On the other hand, the predictive controller is based on motor stator voltage equation; the controller parameters depend heavily on the motor model, and the bandwidth is theoretically higher than the PI controller. In this thesis two signals are used as inputs：step and chirp. The motor performance is simulated and experiments are conducted to compare the responses of different kinds of inputs. In this thesis, modeling of Permanent Magnet Synchronous Motor is firstly presented, using coordinate transformation and vector control methods. We then describe the deadband effect and how to identify the motor parameters by System Identification techniques. The software structure of the proposed current controllers are also demonstrated, and simulated using Matlab/Simulink. Finally, real-time experiments are conducted. The results of PI control have comparatively better performance and higher bandwidth. The Predictive controller is unable to achieve the same level of bandwidth mainly due to DC Bus limitation. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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