基于虚拟电感的PMSM无位置传感器混合控制策略

为实现永磁同步电机全速域无位置传感器控制，常采用低速I-F开环控制和高速反电势模型法相结合的混合控制策略。但这两种方法建立在不同的坐标系，存在着控制结构上的差异，在方案切换时易引起系统振荡。针对此问题，提出了一种基于虚拟电感的平滑切换策略。首先，在反电势模型中引入虚拟电感来人为改变转子位置估计值；再以I-F方案的坐标系为参考模型，反电动势模型为可调模型，运用Popov超稳定理论设计出恰当的虚拟电感使可调模型收敛于参考模型，从而确保两种方案在切换前建立在同一坐标系上，以实现高低速方案平滑、稳定地切换。最后通过仿真和实验验证了所提方案的可行性。

Hybrid Strategy for PMSM Sensorless Control Based on Virtual Inductance

In order to realize wide-speed-range sensorless control of permanent magnet synchronous motor (PMSM), a hybrid control strategy combining low-speed I-F open-loop control and high-speed back electromotive force-based is often adopted. However, because these two methods are established in different reference frames, there are differences in control structures, which will easily cause system oscillation during switching. To solve this problem, a smooth switching strategy based on virtual inductance is proposed. Firstly, the virtual inductance is introduced into the back electromotive force model to artificially change the estimation of the rotor position. And then, taking I-F scheme as the reference model, and the back electromotive force model as the adjustable model, and applying Popov super-stability theory to design an appropriate virtual inductance to make the adjustable model converge to the reference model, so as to ensure that the two schemes is established in the same reference frame before switching, the smooth and stable switching will be achieved. Finally, the feasibility of the proposed scheme is verified by simulation and experiment.