Suppression of Current Ripple in SPMSM With Low Switching Frequency Based on Improved PWM
SVPWM is widely used in motor control due to its advantages such as high voltage utilization.However,as the switching frequency decreases,the output current ripple intensifies,leading to issues like increased system losses and torque ripple,which adversely affect system stability and dynamic performance.To address this problem,this paper proposed a current ripple suppression strategy based on an improved hy-brid PWM.By constructing a current ripple vector model in the stationary coordinate system,the reasons for the intensified ripple at low switching frequencies were analyzed.Through an examination of the relationship between voltage vector action time,sequence,and current ripple,two switching sequences capable of sup-pressing current ripple were selected.Effective suppression of current ripple at low switching frequencies was achieved by calculating the current ripple for different sequences online and switching the output based on the results.A physical experiment platform was established to validate the effectiveness and feasibility of the suppression strategy in practice.
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