低载波比下IPMSM的积分前馈控制策略

Integral Feedforward Control Strategy for IPMSM With Low Carrier Ratio

永磁同步电机(PMSM)采用矢量控制可实现电流静态解耦,但动态耦合关系依然存在,而且随着转速的升高,耦合作用的影响也越来越严重。常用的含前馈解耦的比例积分(PI)电流调节器在动态过程中,由于电机纯滞后环节的存在,使得电流设定值和反馈值不相等,从而直接影响动态解耦性能。针对PMSM闭环矢量控制中励磁电流分量和转矩电流分量之间的交叉耦合以及数字控制延时问题,提出了一种低载波比下内嵌式PMSM(IPMSM)的积分前馈控制策略,提高了电流调节器的解耦精度,电机在低载波运行时的动、静态性能明显提高。仿真和实验结果验证了低载波比下IPMSM积分前馈控制策略的正确性和有效性。

By using the vector control in permanent magnet synchronous motors (PMSM), the current static decoupling is realized. However, the dynamic coupling relationship still exists, more seriously, the influence of coupling deteriorates with the increase of the rotating speed.The feedforward decoupling proportion integration (PI) current regulator makes the current set value and feedback values are not equal in the dynamic process because of time delay, which directly affect the dynamic decoupling performance.The field current component and torque current component can not be decoupled completely in the closed vector control.According to series decoupling theory, a control strategy based on integral feedforward for interior PMSM(IPMSM) with low carrier ratio is proposed.The decoupling precision of current regulator is improved and the dynamic and static characteristics of the motor during low carrier operation are obviously enhanced. The correctness and effectiveness of the proposed method are verified by the simulation and experiment results.