电流源驱动异步电机矢量控制方法研究

Research on Vector Control of Induction Motor Driven by Current Source

为了提高异步电机矢量控制的鲁棒性和闭环控制性能,采用输出电流控制异步电机,研究按定子和气隙磁链定向的矢量控制,通过推导解耦控制方程,附加去耦项,实现系统的彻底解耦控制。研究表明,按定子和气隙磁链定向时磁链和转矩计算公式不含转子参数,避开了易于变化的转子参数对调速系统性能的影响。仿真结果验证了新方法可以有效提高磁场定向的准确性和解耦能力,改善闭环控制的动态性能,提高了系统的鲁棒性。

The manufacturing technique and structure of asynchronous motor and the torque generated by inducing current make it difficult to detect the rotor parameters.When the rotor flux oriented vector control method is adopted,the performance of the control system will deteriorate due to the change of rotor parameters.Large torque ripple and speed fluctuation are also caused.In order to improve the robustness and closed-loop control performance of vector control,the output current is used to control asynchronous motor and the vector control oriented by stator and air gap flux is studied in this paper.The decoupling control equation including the decoupling term is derived to realize the decoupling control of the system.The research results indicate that the calculation formula of flux and torque using the stator and air gap flux oriented vector control method does not include rotor parameters,avoiding the influence of the changing rotor parameters on the system performance.The simulation results verified that the new system can effectively improve the accuracy and decoupling ability of flux orientation,and thereby improving the dynamic performance and robustness of closed-loop control.