基于模型参考自适应的永磁同步电机矢量控制

Vector Control of Permanent Magnet Synchronous Motor Based on Model Reference Adaptive

针对传统机械式传感器对永磁同步电机(PMSM)交流调速系统带来的成本高、体积大、易受干扰、可靠性低且难以在复杂环境中应用等问题,在对永磁同步电机数学模型、矢量控制技术以及无传感器控制技术现状进行研究的基础上,提出了一种基于模型参考自适应理论(MRAS)的转速和转子位置速度估计方法.以永磁同步电机本身作为参考模型,以含有转速变量的定子电流方程作为可调模型,以Popov稳定性理论为基础设计自适应律,根据自适应律判断当两模型等效时,估计转速收敛于实际转速,对转速积分得到转子位置,实现无传感器的电机矢量控制.仿真结果表明:应用该无传感器控制策略的交流调速系统能够在转速突变、负载转矩扰动的情况下,快速、准确地估算转速和转子位置,动态、静态性能良好,鲁棒性强.

In order to solve the problems of high cost, large volume, low reliability, being susceptible to interference and difficult to applying in a complex application environment caused by the traditional mechanical sensor to permanent magnet synchronous motor (PMSM) AC drive system, a novel method to estimate rotor speed and position based on model reference adaptive system (MRAS) was presented.Mathematical model of permanent magnet synchronous motors(PMSM), vector control method and current sensorless control technology was studied.PMSM was considered as reference model and the stator current equations were considered as adjustable model containing variable speed.Adaptive law was designed based on Popov stability theory.When two models were equivalent according to adaptive law, the estimated speed converges to the actual speed.The rotor position can be estimated from integrating of the speed.The motor vector control was realized without sensor.Simulation results indicated that application of this method can quickly and accurately estimate the rotor speed and position towards speed variations and load disturbance in AC drive system, and that both static/dynamic performance and robustness was improved.