基于滑模观测器的船用永磁推进电机位置辨识研究

Rotor Position Estimation Based on Sliding Mode Observer for Marine Permanent Magnet Propulsion Motor

针对传统滑模观测器永磁同步电机转子位置辨识存在特征频次交流扰动的问题,分析了开关管死区效应、导通压降和电流采样调理精度等非理想逆变对辨识反电动势和转子位置的影响,提出了一种基于内嵌陷波器的同步旋转坐标系锁相环技术,抑制了辨识反电动势中特征频次扰动信号对转子位置辨识值的影响,并给出了新型锁相环参数选择确定的原则和依据。仿真结果表明该算法可以有效削弱逆变非理想特性对转子位置辨识结果的影响,验证了本文理论分析的正确性和所提策略的有效性。

To solve the problem of AC periodically oscillating error in permanent magnet synchronous motor rotor position estimation, the influence of inverter non-linearity such as dead-time effect, on-voltage drop and current sampling accuracy on rotor position estimation is analyzed. A phase -locked loop technology suppressing the influence of the periodically oscillating signal contained in effective back EMF, based on synchronous rotating coordinate system with embedded notch filter, is proposed. And then principle and basis for the determination of the new phase-locked loop parameters are given. The simulation results show that this algorithm can weaken the influence of inverter non-linearity on the rotor position estimation, and proves the validity of the theoretical analysis and the feasibility of the estimation strategy.