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模糊控制在矢量控制系统中的应用研究
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摘要
矢量控制技术通过坐标变换将交流电机的定子电流矢量解耦为转矩电流与励磁电流两个直流分量并分别对其进行控制,使得交流电机能够达到直流电机的控制效果。然而,在实际应用中,许多交流调速系统存在非线性、变参数等特点,这导致很大程度上依赖于参数准确性的矢量控制系统控制性能变差。针对这一现象,本文将模糊控制理论应用于矢量控制系统中。模糊控制作为一种典型的智能控制方法,能有效提高矢量控制系统的鲁棒性。
     本文对矢量控制系统以及模糊控制的原理进行了深入研究,并以实用性为目的,设计出一种新型的PI型模糊控制算法。为了验证理论的正确性,在MATLAB/Simulink仿真环境下建立了矢量控制系统的模型。在建模过程中,充分考虑了实际情况,力求让仿真尽可能地逼近实际。在仿真中,让矢量控制系统的速度调节器分别采用了PI控制器与模糊控制器,并对两者的仿真结果进行了分析比较。
     在系统的控制理论得到仿真结果的验证之后,根据系统要求,设计出三相两电平变频器的硬件,并基于所设计的硬件系统开发了矢量控制系统的软件。最后,使用设计的矢量控制系统进行了电机拖动实验,并同样地,在速度环中分别采用了PI控制器与模糊控制器。实验结果表明,将本文设计的PI型模糊控制算法应用于矢量控制系统的速度控制器中,能明显提高系统的鲁棒性。
Vector control technology makes AC motor achieve the same control effect as DC motor by decoupling the stator current vector of AC motor into the two DC components of torque current and magnetizing current via the coordinate transformation and controlling these two components separately. However, there are characteristics like non-linear and parameter variability for many AC drive systems in practical applications. These cause the control performance of vector control system which largely depends on the accuracy of the parameter to deteriorate. In response to this phenomenon, fuzzy control theory is applied in the vector control system in this paper. As a typical method of intelligent control, fuzzy control can effectively improve the robustness of vector control system.
     The theories of vector control system and fuzzy control are in-depth studied and a novel PI-type fuzzy control algorithm is designed as the goal of practicality in this paper. In order to verify the correctness of the theory, a vector control system model was set up in the MATLAB/Simulink simulation environment. In the process of modeling, the actual situation was fully taken into account so as to make simulation closely with the actual situation as much as possible. PI controller and fuzzy controller were respectively used as the speed regulator of vector control system in the simulation, and analysis and comparation were made between the two results of simulation.
     After the control theory of the system had been verified by the simulation results, a suit of hardware of three-phase two-level inverter was designed according to the system's requirements, and the software of vector control system was developed based on the hardware system. At last, motor drive experiments were made by using the vector control system which had been designed, and as the simulation, PI controller and fuzzy controller were respectively used in the speed close-loop. The experimental results show that the robustness of system will be obviouly improved if the PI-type fuzzy control algorithm which is designed in this paper is applied in the speed controller of vector control system.
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