A novel AC/DC/AC converter topology, a three-phase switching mode rectifier (SMR) and a three-phase multilevel inverter with separate DC power supplies, is proposed in this paper. To improve the power quality, three-phase SMR is adopted to supply sinusoidal wave with high power factor and current distortion. The separate DC bus voltages are provided by switching mode DC-DC converters. The full-bridge cells are adopted to provide multilevel line voltage. The control schemes of three-phase multilevel inverter are based on look-up table with sine-triangular PWM method. The voltage unbalance problem between the separate DC bus voltages is improved by using the proposed control scheme. The proposed AC/DC/AC converter is verified by computer simulations.
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机译:本文提出了一种新颖的AC / DC / AC转换器拓扑,一个三相开关模式整流器(SMR)和一个具有独立直流电源的三相多电平逆变器。为了提高电源质量,采用三相SMR来提供具有高功率因数和电流失真的正弦波。单独的DC总线电压由开关模式DC-DC转换器提供。采用全桥单元提供多级线电压。三相多电平逆变器的控制方案基于基于正弦三角形PWM方法的查找表。通过使用建议的控制方案,可以改善单独的直流母线电压之间的电压不平衡问题。所提出的AC / DC / AC转换器已通过计算机仿真验证。
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