Abstract
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 α-ß components in the fundamental subspace and the loss-producing x-y 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 x-y 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.
Highlights
The vector space decomposition (VSD) method is widely adopted for the control of an asymmetric dual three-phase permanent magnet synchronous motor (ADT-PMSM) [7,8]
Through the analysis of dead-time effects, this paper proposes a current harmonic suppression algorithm that combines the feedforward voltage compensation with a resonant controller implemented in the x-y subspace as the feedback current controller
The feedforward voltage compensation can eliminate the current harmonics between 73% and 78% of its original value based on the accurate phase current polarities, which are determined based on the relationship between the current vector angle and the polarities
Summary
With the wide application of power electronic converters, the motor drive system is no longer. The vector space decomposition (VSD) method is widely adopted for the control of an asymmetric dual three-phase permanent magnet synchronous motor (ADT-PMSM) [7,8]. In References [14,15], by suitably selecting the voltage vectors from the divided vector groups into one sampling period, the current harmonics can be reduced compared to the Switching Table based Direct Torque Control (ST-DTC) drive This method can only avoid injecting harmonic voltages into the x-y subspace. Online methods are proposed in [21], but these methods add computational burden to the algorithm and require a lookup table to search for the corresponding parameters under certain operating points These above-mentioned schemes need the accurate polarities of phase currents [18,19,20,21].
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