论文部分内容阅读
通过分析PWM变频器端共模电压、差模电压产生的原因及其在长线电缆上传输的波过程,得出较高的共模电压、差模电压在采油电动机星点处产生的影响,所以必须对其进行消除和抑制。针对上述结论经过理论分析、Multisim仿真可知,共模电压、差模电压在经过LC滤波器之后能够得到有效地抑制。最后试验波形的频谱图验证了该LC滤波保护系统设计的有效性和可行性。
By analyzing the common mode voltage and differential mode voltage of PWM inverter and the wave process of transmission on the long-distance cable, the effect of higher common-mode voltage and differential-mode voltage on the star point of the oil-producing motor is obtained It must be eliminated and repressed. According to the above conclusions, after theoretical analysis, Multisim simulation shows that common-mode voltage and differential-mode voltage can be effectively suppressed after passing LC filter. The spectrum of the final test waveform verifies the effectiveness and feasibility of the LC filter protection system design.