六相感应电机二阶滑模无速度传感器控制

Second-order sliding-mode speed sensorless control strategy for six-phase induction motor

围绕六相感应电机(IM)的高性能无速度传感器驱动控制问题,设计了一种二阶滑模(SOSM)模型参考自适应系统(MRAS)估计器,实现了六相IM的无速度传感器优化直接转矩控制(DTC)。新型控制方案中使用了超扭曲算法(STA)提出了一种补偿磁链观测器,本质上属于SOSM策略,并将观测器用作MRAS转速估计参考模型。此外,针对DTC策略中的转速外环设计了基于STA的SOSM控制器,以提高对外部负载扰动的鲁棒性。最后,测试结果验证了二阶滑模MRAS无速度传感器DTC控制策略可以克服经典滑模控制固有的抖振问题,并对参数不确定性和直流偏置具有较强的鲁棒性。

Focusing on the high-performance speed sensorless drive control of six-phase induction motor(IM), a second-order sliding mode(SOSM) model reference adaptive system(MRAS) estimator is designed to realize the optimized speed sensorless direct torque control(DTC) for six-phase IM. The super twisting algorithm is used in the new control scheme to propose a compensated flux observer, which is inherently an SOSM strategy. This observer is adopted as the reference model for MRAS speed estimation. In addition, a SOSM controller based on the upper twisting algorithm is designed for the speed outer loop in the DTC to improve the robustness to external load disturbances. Finally, the test results verified the SOSM MRAS speed sensorless DTC strategy can overcome the inherent chattering problem of classical sliding mode control, and has strong robustness to parameter uncertainties and dc bias.