Conducted EMI Reduction by Active Power Filter Embedded in Neutral-Point-Clamped Converters
This paper proposes an ovel modulation strategy with anactive power filter(APF) for reducing conducted electromagnetic interference(EMI) in three-level neutral-point-clamped AC/DC PWM converters.Common-mode(CM) voltage is identified as one of the main causes of EMI in power electronics systems driven by pulse-width modulation(PWM) converters.To address this issue, the paper proposes a CM voltage reduction strategy using a fourth-leg APF with shunt capacitors, which overcomes the limitations of existing methods. The proposed strategy allows for the complete elimination of CM voltage, and compensation is proposed to eliminate residual CM voltages due to the dead time effect. Additionally, the paper presents a design procedure for the APF circuit to obtain a proper reduction performance. Simulation and experimental results demonstrate the effectiveness of the proposed strategy in reducing both CM voltage and current, as well as conducted EMI.
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