Abstract
Due to motor asymmetry and system nonlinear factors, the dual three-phase permanent magnet synchronous motor (PMSM) drives produce a large number of current harmonics during operation. Based on the Vector Space Decoupling model, the six-phase currents of the dual three-phase PMSM can be decomposed into the αβ, the z 1 z 2 and the o 1 o 2 components. Speed and torque are controlled by controlling the α-β current components. In addition, controlling the z 1 -z 2 current components is essential in suppressing current harmonics. In this paper, we propose two current harmonic suppression methods. Firstly, synchronous, anti-synchronous and bidirectional synchronous PI controllers are proposed to suppress current harmonics caused by different types of motor asymmetry. Secondly, a quasi-proportional resonance controller is proposed to suppress current harmonics caused by nonlinear factors of system. Simulation and experimental results demonstrate the effectiveness of the proposed methods.
Highlights
Multiphase motor drives have attracted extensive research interest from many scholars, due to their characteristics of low voltage and high power output [1]–[3]
SIMULATION AND ANALYSIS OF CURRENT HARMONIC SUPPRESSION FOR MOTOR ASYMMETRY In order to verify the approach presented in part A of Section III, the asymmetry was simulated by adding external resistors in series with the stator windings
The current harmonics of the dual three-phase permanent magnet synchronous motor (PMSM) drive system are divided into two categories
Summary
Multiphase motor drives have attracted extensive research interest from many scholars, due to their characteristics of low voltage and high power output [1]–[3]. Z. Ruan et al.: Current Harmonic Suppression for Dual Three-Phase PMSM Drives the asymmetry of the motor makes the fundamental subspace no longer perpendicular to the z1z2 subspace, which causes parts of the fundamental components in the subspace react in the z1z2 subspace. Based on the VSD model, the relationship between the control variable and the motor variable of dual three-phase PMSMs with isolated neutral points can be expressed as: fα fβ fz fz2 T = Tαβ fa fb fc fu fv fw (1). IMPROVED CURRENT HARMONIC SUPPRESSION METHODS Through the analysis based on the VSD model established, it can be seen that there are two reasons for the generation of current harmonic of dual threephase PMSMs. One is the asymmetry of motor, which will produce positive or negative sequence components. Corresponding mitigation strategies for the two different current harmonic causes are presented
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