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文章介绍了电动汽车交流驱动中采用确定脉宽调制(D P W M)技术和随机脉宽调制(R P W M)技术的比较研究结果。RPWM 方法替代 DPWM 方法,采用Avant!公司先进的仿真软件SABER,其重点是降低电磁干扰(EMI)。为了评估 PWM 技术对驱动性能的影响,同时对驱动效率,转矩脉动和电流控制系统动态响应进行了研究。文中考虑了逆变器开关频率随机变化定义的2 种 R P W M 技术:一种技术是调制器的取样频率与开关频率同步变化;另一种技术是取样频率固定且等于平均开关频率。研究表明:在驱动性能几乎不受影响的同时,RPWM技术降低EMI 的良好潜力,可使EMI 下降10dB 或更多。
The article introduces the comparative research results of the deterministic pulse width modulation (D P W M) technology and the random pulse width modulation (R P W M) technique in the AC drive of electric vehicles. The RPWM method replaces the DPWM method and uses Avant! S advanced simulation software SABER, which focuses on reducing electromagnetic interference (EMI). In order to evaluate the influence of PWM technology on driving performance, the dynamic response of driving efficiency, torque ripple and current control system are studied. In this paper, we consider two kinds of R P W M techniques defined by the random variation of the inverter switching frequency: one is that the sampling frequency of the modulator changes with the switching frequency synchronously; the other is that the sampling frequency is fixed and equal to the average switching frequency. Research shows that while driving performance is virtually unaffected, RPWM technology offers the potential for EMI reduction, reducing EMI by 10 dB or more.