An Optimized SVPWM Strategy for Five-Level Active NPC (5L-ANPC) Converter
An Optimized SVPWM Strategy for Five-Level Active NPC (5L-ANPC) Converter
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DOI：
10.1109/tpel.2013.2248172
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发表时间：
2014
影响因子：
6.7
通讯作者：
Guojun Tan;Qi Deng;Zhan Liu
中科院分区：
文献类型：
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作者：
Guojun Tan;Qi Deng;Zhan Liu
五电平有源中性点箝位（5L-ANPC）变换器因其在大功率中压场合的优异性能而得到广泛研究。在虚拟坐标系下分析了5L-ANPC变换器的空间矢量脉宽调制（SVPWM）控制策略，首次提出了一种能够平衡中性点电压和避免死区效应的优化控制策略。该策略首先将125个空间矢量用七段矢量合成法中的96个三角形组合起来，然后将这些三角形分成具有不同平衡NP电压特性的七类，每一类三角形都有自己的矢量序列选择和矢量持续时间计算原则。另一方面，对5L-ANPC变换器的死区效应进行了详细研究，并在优化控制策略中对不同开关状态之间的转换进行了约束，以避免传统的基于脉冲的死区补偿方法无法补偿的死区效应。最后，本文对优化后的SVPWM策略进行了实验验证。
The five-level active neutral-point-clamped (5L-ANPC) converter has been widely studied for its excellent performance in high-power medium-voltage applications. This paper analyzes the space vector pulse width modulation (SVPWM) strategy of the 5L-ANPC converter in the virtual coordinate, and presents an optimized control strategy which can balance the neutral point (NP) voltage and avoid the dead-time effects for the first time. In this strategy, on one hand, the 125 space vectors are combined by 96 triangles in the seven-segment vector synthesis method, then the triangles are divided into seven categories which have different characteristics of balancing the NP voltage, and every category has its own principles to choose the vector sequence and compute the vector durations. On the other hand, the dead-time effects of the 5L-ANPC converter are studied in detail and the transitions between different switching states are constrained in the optimized control strategy to avoid the dead-time effects that cannot be compensated by traditional pulse-based dead-time compensation methods. Finally, the optimized SVPWM strategy is experimentally verified in this paper.