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Analysis and design of a feed-forward-type active filter to eliminate common-mode voltage generated by a PWM inverter

机译:进料转向型有源滤波器的分析与设计,以消除PWM逆变器产生的共模电压

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An equivalent model of a four-winding transformer for a feed-forward-type active filter is presented in this paper and a three-phase inverter-fed motor drive system can be described as a single-phase system for the convenience of analysis. After a passive common-mode voltage detection method is analysed theoretically, a resistor-capacitor network is used to detect common-mode voltage generated by a PWM inverter; a push-pull circuit, in which the complementary transistors have no maximal rating voltage limitation, is used to amplify current for driving a four-winding transformer which is used to impose a compensating voltage with the same amplitude but with the opposite polarity to the common-mode voltage generated by the PWM inverter. Some design considerations of the filter are also given in detail. In a 380V/3kW motor drive system, simulation analysis and experimental results confirm the validity of the proposed filter that the common-mode voltage at motor terminal is eliminated almost completely and the negative effects of the common-mode voltage, such as shaft voltage and bearing current, are unobvious.
机译:本文提出了一种用于前馈式有源滤波器的四绕组变压器的等效模型,并且可以将三相逆变器供给电动机驱动系统描述为单相系统,以便于分析。在理论上分析被动共模电压检测方法之后,电阻电容器网络用于检测PWM逆变器产生的共模电压;推挽电路,其中互补晶体管没有最大额定电压限制,用于放大用于驱动四绕组变压器的电流,该电流用于施加具有相同幅度的补偿电压,而是具有相反的极性-Mode电压由PWM逆变器产生。还详细给出了过滤器的一些设计考虑因素。在380V / 3KW电机驱动系统中,仿真分析和实验结果证实了所提出的过滤器的有效性,即几乎完全消除了电机端子的共模电压以及共模电压(例如轴电压)的负面影响轴承电流,是不吸收的。

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