传统三电平中点平衡控制方法在低不平衡度下对中点波动的抑制效果显著，然而在高不平衡度负载下有待改进。本文通过对不平衡程度进行实时检测分析，提出一种基于零电平分解的中点平衡优化控制方法。在不平衡程度达到临界阈值时，对零电平分解作用区域和分解量进行协调控制，使三电平三桥臂储能变流器在高不平衡度工况下的中点电压波动得到较好抑制。仿真实验结果验证了所提方法在各不平衡度负载工况下均具有良好的中点电位平衡能力。
The traditional three-level neutral-point balance control method has a significant suppressive effect on neutral-point fluctuations under low imbalance, but needs improvement under high imbalance loads. In this artical, a neutral-point balance optimization control method based on the disassembly of zero level is proposed through real-time detection and analysis of the degree of imbalance. When the degree of imbalance reaches the critical threshold, coordinated control is carried out on the disassembly area of zero level and disassembly amount to effectively suppress the neutral-point voltage fluctuation of the three-level three-leg power conversion system under high imbalance conditions. The simulation experimental results verify that the proposed method has good neutral-point potential balancing ability under various unbalanced load conditions.
2024,46(15): 63-69 收稿日期：2023-10-18
DOI：10.3404/j.issn.1672-7649.2024.15.011
分类号：TM46
基金项目：湖北省自然科学基金资助项目（2021CFB030）
作者简介：肖琨羿（2000 – ），男，硕士研究生，研究方向为电力电子与电力传动
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