CURRENT HARMONIC SUPPRESSION STRATEGY OF PERMANENT MAGNET SYNCHRONOUS MOTOR BASED ON MULTI-SYNCHRONOUS ROTATING COORDINATE SYSTEM
Keywords:
Permanent magnet synchronous motor, Multiple synchronous rotating coordinate systems, Harmonic suppressionAbstract
This paper focuses on the harmonic problems of stator current in permanent magnet synchronous motor (PMSM) caused by factors such as magnetic circuit saturation and inverter nonlinearity, and conducts research on harmonic suppression strategies based on multiple synchronous rotating coordinate systems. Firstly, the hazards of harmonics to motor efficiency, torque stability, and system reliability are analyzed, and the engineering significance of harmonic suppression technology is expounded. On this basis, a mathematical model of PMSM containing 5th and 7th harmonics is established, and a harmonic extraction and compensation method combining low-pass filtering and closed-loop PI control in multiple synchronous rotating coordinate systems is proposed. By constructing a coordinate system that rotates synchronously with the harmonics, the harmonic components are converted into direct currents for precise suppression, and the corresponding control structure is designed to achieve harmonic voltage compensation. Simulation results show that this strategy can effectively reduce the total harmonic distortion of stator current and improve the current waveform quality at different speeds of 500 r/min and 1500 r/min, verifying the effectiveness and practicality of the proposed method under different operating conditions, and providing a feasible control solution for high-performance and low-harmonic operation of PMSMs.References
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