A novel strategy for three-phase/switch/level (Vienna) rectifier under severe unbalanced grids
A novel strategy for three-phase/switch/level (Vienna) rectifier under severe unbalanced grids
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DOI：
10.1109/tie.2012.2217721
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发表时间：
2013-10
期刊：
影响因子：
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通讯作者：
Ming Zhang;L. Hang;W. Yao;Zheng-yu Lu;L. Tolbert
中科院分区：
文献类型：
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作者：
Ming Zhang;L. Hang;W. Yao;Zheng-yu Lu;L. Tolbert
不平衡电网会在直流侧电压和输入有功/无功功率中产生两倍的基频纹波，从而降低维也纳整流拓扑的性能。传统的控制策略是输入电流跟踪控制方案，它可以在任何不平衡条件下工作，但不能消除输入功率纹波和输出直流侧电压纹波。另一类以消除输入功率纹波为目的的控制策略可以保持输入功率恒定，消除直流侧电压纹波，但在电网严重不平衡的情况下会失效。本文首先分析了恒功率控制方法的理论局限性，在此基础上提出了一种注入少量功率纹波的控制方法，以实现工作区域与输出直流电压纹波之间的折衷。最后，给出了恒功率控制的实验结果，验证了所提控制方法的性能。
Unbalanced grids introduce performance deterioration for the Vienna rectifier topology by producing twice fundamental frequency ripple in the dc-link voltage and input active/reactive power. A traditional control strategy is the input current tracking scheme, which can work under any unbalanced conditions, but it cannot eliminate the input power ripple and the output dc-link voltage ripple. Another class of control strategy for the purpose of eliminating the input power ripple can maintain constant input power and eliminate the dc-link voltage ripple, however, it will fail under severe unbalanced grids. This paper first analyzes the theoretical limits of constant power control method, and based on which a novel control method that injects a small amount of power ripple is proposed to make a compromise between the working area and the output dc voltage ripple. Finally, the experiment results using constant power control method are given and validate the performance of the proposed control method.