Current Harmonic Suppression Algorithm for Asymmetric Dual Three-Phase PMSM

• Main Authors: Zhihong Wu, Weisong Gu, Ke Lu, Yuan Zhu, Jianbin Guan
• Format: Article
• Language: English
• Published: MDPI AG 2020-02-01
• Series: Applied Sciences
• Subjects: asymmetric dual three-phase permanent magnet synchronous motor; vector space decomposition; current harmonic suppression; feedforward voltage compensation; resonant controller
• Online Access: https://www.mdpi.com/2076-3417/10/3/954

Based on the vector space decomposition (VSD) transformation, the currents of an asymmetric dual three-phase permanent magnet synchronous motor (ADT-PMSM) with isolated neutral points are decoupled into the torque, producing <i>&#945;-&#223;</i> components in the fundamental subspace and the loss-producing <i>x-y</i> components in the harmonic subspace. In order to suppress the current harmonics, a feedforward voltage compensation that is calculated according to the dead time, turn on/off time, and the voltage drop is added to the reference voltage of the control algorithm. Due to the limitations of the feedforward voltage compensation method, a feedback current control loop is set up in the <i>x-y</i> subspace, where an improved resonant controller is adopted to generate the compensation voltage. The improved resonant controller can achieve a high gain at a specific frequency. The experimental results verify the effectiveness of the proposed method.