考虑磁路饱和的IPMSM电感辨识算法及变参数MTPA控制策略

内置式永磁同步电机(IPMSM)d、q轴电感会随着磁路饱和程度的不同而发生改变,这会降低最大转矩电流比(MTPA)控制的有效性。考虑到定子电流引起的磁路饱和及交叉饱和效应的影响,提出了相应的d、q轴电感辨识算法和变参数MTPA控制策略。采用基于旋转高频电压注入的d、q轴电感辨识算法可在其他电机参数未知的前提下得到不同负载条件下的d、q轴电感;变参数MTPA控制策略能够充分利用标幺值化处理的优势,在转矩-最优电流控制表不变的基础上,只需根据实际d、q轴电感更新电流基值和转矩基值便可克服电感变化带来的不利影响,并实现一定转矩条件下的最佳MTPA控制。最后在电机控制实验平台上通过实验对提出的电感辨识算法和变参数MTPA控制策略的可行性和有效性进行了验证。

Inductance Identification Algorithm and Variable-Parameters MTPA Control Strategy for IPMSM Considering Magnetic Circuit Saturation

The d-axis and q-axis inductance of an IPMSM(Interior Permanent Magnet Synchronous Motor)vary with the change of the magnetic circuit saturation,which may reduce the effectiveness of MTPA(Maximum Torque per Ampere)control.Considering the influence of magnetic circuit saturation effect and cross saturation effect caused by the stator current,an inductance identification algorithm and a variable-parameters MTPA control strategy are proposed in this paper.Using the inductance identification algorithm based on rotating high-frequency voltage injection,the d-axis and q-axis inductance under various load conditions could be obtained without any priori knowledge about other parameters.The merits of per unit system are fully utilized by the variable-parameters MTPA control strategy.Using the strategy,the current base value and torque base value are just calculated and the control table of torque-optimal current need not be changed when the d-axis and q-axis inductance have varied,which could overcome the adverse effect caused by inductance parameters variations and achieve the optimal MTPA control under certain torque condition.Finally,experiments were made on an IPMSM control platform,the feasibility and availability of the inductance identification algorithm and the variable-parameters MTPA control strategy presented were validated by experimental results.