An Improved Virtual Space Vector Modulation Scheme for Three-Level Active Neutral-Point-Clamped Inverter

An Improved Virtual Space Vector Modulation Scheme for Three-Level Active Neutral-Point-Clamped Inverter
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三电平有源中性点钳位逆变器改进的虚拟空间矢量调制方案

DOI:
10.1109/tpel.2016.2621776
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发表时间:
2017-10
影响因子:
6.7
通讯作者:
Nian Liu
Nian Liu
中科院分区:
工程技术1区
文献类型:
--
作者:
Weixiang Shen;Qunjing Wang;Fanglin Luo;Nian Liu

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提出了一种改进的三电平有源中性点箝位(3L-ANPC)逆变器虚拟空间矢量调制(IVSVM)方案,以平衡中点电位(NP)、降低开关损耗和抑制共模电压(CMV)。在IVSVM方案中,由于新的空间矢量图的任何区域中总是存在两对小矢量,因此改进的虚拟中矢量(VMV)由原始中矢量和相邻的两对小矢量合成。改进的VMV提供了在一个开关周期内在任何调制指数和功率因数下控制NP平衡的灵活性,同时实现SL减少和CMV抑制。这是通过根据NP电荷和脉冲序列适当选择两对小矢量来实现的。基于3L-ANPC逆变器搭建了实验平台,实验结果验证了IVSVM控制策略的有效性。
This paper presents an improved virtual space vector modulation (IVSVM) scheme for a three-level active neutral-point-clamped (3L-ANPC) inverter to balance neutral-point potential (NP), reduce switching loss, and suppress common mode voltage (CMV). In the IVSVM scheme, an improved virtual medium vector (VMV) is synthesized by the original medium vector and the adjacent two pairs of the small vectors since there are always two pairs of the small vectors in any regions of the new space vector diagram. The improved VMV provides the flexibility to control the NP balancing under any modulation indexes and power factors in one switching cycle while achieving SL reduction and CMV suppression. This is achieved by the proper selection of two pairs of small vectors in terms of NP charge and the pulse sequence. The experimental platform based on a 3L-ANPC inverter is established and results obtained to verify the effectiveness of the IVSVM control strategy.
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