摘要
变频调速系统产生的轴电流问题已经成为主要轴承故障,由于轴电流的产生,严重影响到了电驱动系统的稳定性和安全性,因此本文通过Matlab/simulink建立轴向三段式高频轴电流预测模型,研究SPWM控制策略中的载波频率,基础波频率和直流母线电压对轴电流的影响,根据仿真得到的轴电流波形,在单位时间内,对轴电流的发生的次数和轴电流值进行对比研究,结果表明,随着载波频率的增加,在相同时间内,轴电流产生的频率增加,轴电流增长幅度不大,变化平稳。因此载波频率的改变影响单位时间内轴电流产生的次数,对于轴电流值影响不大。随着直流母线电压的升高,轴电流波形和产生次数几乎不变,轴电流随着母线电压的增大而增大基础波频率对于轴电流的发生次数影响不大,随着基础波频率的增大,产生的轴电流值几乎不变,轴承等效电容的变化,轴电流值不断升高,轴电流波形变化不大。
The shaft current caused by the variable frequency speed regulating system has become the main bearing fault. Because of the shaft current, it seriously affects the stability and safety of the electric drive system. The three-stage axial high frequency axial current prediction model was established by Matlab/simulink to study the influence of carrier frequency, base wave frequency and DC bus voltage on axial current in SPWM control strategy. According to the simulation waveform, the fre-quency of axial current occurrence and axial current value were compared in unit time. With the increase of the carrier frequency, the frequency generated by the axial current increases in the same time, and the axial current increases slightly and changes steadily. Therefore, the change of carrier frequency affects the number of axial current generation in unit time, but has little influence on axial current value. With the increase of the DC bus voltage, the axial current waveform and the frequency of generation are almost unchanged. With the increase of DC bus voltage, the waveform and number of axial currents generated are almost constant. The frequency of the fundamental waveform has little effect on the number of times the axial current occurs. With the increase of the basic wave frequency, the generated axial current value is almost unchanged, with the change of bearing equivalent capacitance, the shaft current value keeps increasing, and the shaft current waveform changes little.
出处
《建模与仿真》
2023年第1期81-89,共9页
Modeling and Simulation
