摘要
为了抑制PWM逆变器中的共模电压,介绍一种二阶无源低通滤波器。该滤波器可有效地减小电机终端差模和共模电压的dv/dt,甚至包括与长导线相连的电机。减小电机的过电压和差模电压的dv/dt,同时也减小了电机中的励磁电压。共模dv/dt减小也表明电机相对于地高频轴承电流和轴承电压也减小。提出的滤波器的一个重要的优点就是可接到逆变器的外壳上来减小电机终端的共模和差模的dv/dt。因此,使用该滤波器可以有助于提高轴承寿命和提高PWM驱动系统的可靠性。滤波器的配置对新的和改进的480V/575V的PWM逆变器是优良的。
In order to suppress the common-mode voltage in PWM inverter, an improved inverter output filter was introduced. The proposed filter is shown to effectively reduce both the differential and common modes dv/dt at the motor terminals, even in the presence of long motor leads. Reduce the motor voltage and differential mode voltage dv/dt, but also reduce the stress on the motor insulation. Lowering common mode dv/dt is shown to significantly reduce high-frequency leakage currents to ground and induce shaft voltage in the motor. An important advantage of the approach is that the filter can be installed within the inverter enclosure to achieve both the differential and common modes dv/dt reductions at the motor terminals. Thus, the use of the filter can contribute to enhanced bearing life and improve reliability of PWM drive systems. The filter configuration is an excellent candidate for many new and retrofit PWM 480 V/575 V drive systems.
出处
《黑龙江大学工程学报》
2013年第3期92-96,共5页
Journal of Engineering of Heilongjiang University
基金
黑龙江省教育厅科学技术研究项目(1151062)
关键词
PWM逆变器
共模电压
分析
抑制
PWM inverter
common-mode voltage
analyse
suppression
