| Summary: | 碩士 === 國立中央大學 === 電機工程學系 === 105 === An adaptive backstepping control (ABSC) based Lagrange multiplier (LM) maximum torque per ampere (MTPA) control of a synchronous reluctance motor (SynRM) is proposed in this study to construct a high-performance SynRM speed drive system. The dynamic model of a field-oriented SynRM speed drive is described first. Next, an integral-proportional controller is designed for the tracking of the speed reference. Since the torque of the SynRM is nonlinear and time-varying, it is very sensitive to the variations of the inductance and current. Therefore, a traditional MTPA control is using in the SynRM speed drive system. However, due to the saturation effect, the real MTPA current angle is higher than the traditional one in the practical. In the light of this, in order to further increase the robustness and effectiveness of the SynRM speed drive, an ABSC based LM MTPA (ABSCLMMTPA) control of the SynRM is proposed to achieve the real MTPA of the SynRM speed drive, using the LM to obtain the current command of the direct and quadrature axis. Then, the adaptive law can estimate the required inductance to reduce the saturation effect. In addition, the adaptive law is derived using Lyapunov stability theorem to update the control parameters in the real-time. Finally, the proposed speed control system is implemented in a 32-bit floating-point digital signal processor, TMS320F28075. The robustness and effectiveness of the proposed ABSCLMMTPA control system are verified by some simulated and experimental results.
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