Novel DPWM Method with Suppression of the Voltage Unbalance in the Neutral-Point for Vienna Rectifier

2023 IEEE Applied Power Electronics Conference and Exposition (APEC) Pub Date : 2023-03-19 DOI:10.1109/APEC43580.2023.10131193

Young-Min Go, June-Seok Lee

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Abstract

This paper proposes discontinuous Pulse-Width Modulation (DPWM) method for Vienna rectifier with mitigation of the voltage unbalance in the neutral-point. Vienna rectifier is greatly stable and well-established topology for high power transmission system. However, since Vienna rectifier has the circuit structure that each phase leg and mid-point of dc-link capacitor are connected, DC and AC voltage unbalance can occur at the neutral-point. In the proposed method, fluctuation of the neutral-point voltage is analyzed based on space-vector diagram. Based on the analysis, one of the three-phase reference voltages is selected as clamped phase for suppressing the AC voltage unbalance. Furthermore, DC unbalance can be suppressed by applying the modulation method which considers the difference between dc-link top voltage and bottom voltage. In addition, mathematical prediction of the neutral-point voltage fluctuation is presented for applicating the proposed method regardless of the accuracy of the dc-link voltage sensor. The performance and validity of the proposed method is verified by simulations.

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抑制维也纳整流器中性点电压不平衡的新型DPWM方法

提出了维也纳整流器中性点电压不平衡的间断脉宽调制(DPWM)方法。维也纳整流器是一种稳定、完善的大功率输电系统拓扑结构。但由于维也纳整流器的电路结构是各相支路与直流电容中点相连，在中性点处可能出现直流和交流电压不平衡。该方法基于空间矢量图对中性点电压波动进行分析。在分析的基础上，选择其中一个三相参考电压作为箝位相，抑制交流电压不平衡。此外，采用考虑直流链路顶电压和底电压之差的调制方法可以抑制直流不平衡。此外，在不考虑直流电压传感器精度的情况下，给出了应用该方法的中性点电压波动的数学预测。仿真结果验证了该方法的有效性和有效性。

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2023 IEEE Applied Power Electronics Conference and Exposition (APEC)

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