伺服驱动器由于具有很强的非线性,导致永磁同步电机(PMSM)的定子电流中含有大量的高次谐波并且引发较大的转矩脉动。针对这一问题,提出基于级联型二阶广义积分器(SOGI)的谐波抑制方法,将级联型SOGI与电流环d、q轴的PI控制器并联,利用级联型SOGI提取d、q轴电流中的6次谐波分量,并将其注入到PI控制器的输出电压中,从而抵消参考电压中的谐波。仿真结果表明:采用基于级联型SOGI的电压补偿法进行谐波抑制,电流波形的畸变得到了明显改善,证明了所提算法的有效性。

Due to the strong nonlinearity of the servo drive, the stator current of permanent magnet synchronous motor (PMSM) contained a large number of higher harmonics and caused a large torque ripple. To solve this problem, a harmonic suppression method based on cascaded secondorder generalized integrator (SOGI) was proposed. Cascaded SOGI was parallel to current loop dqaxis PI controllers. The sixth harmonic component of dqaxis current was extracted by cascaded SOGI and injected into the output voltage of PI controllers, which could offset the harmonic in reference voltage. The simulation results showed that the distortion of current waveform had been greatly reduced by using voltage compensation method based on cascaded SOGI, which confirmed the effectiveness of the algorithm.

TM 351

国家自然科学基金项目(51607142)