Performance Improvement of DC Capacitor Voltage Balancing Control for Cascaded H-Bridge Multilevel Converters
Performance Improvement of DC Capacitor Voltage Balancing Control for Cascaded H-Bridge Multilevel Converters
复制标题
级联H桥多电平变换器直流电容电压平衡控制的性能改进
DOI：
10.1109/tpel.2020.3012540
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发表时间：
2021-03
影响因子：
6.7
通讯作者：
Bo Zhan
中科院分区：
文献类型：
--
作者：
Bi Liu;Wensheng Song;Yunwei Li;Bo Zhan
针对单相级联h桥（CHB）多电平变换器，提出了一种改进的直流电容电压平衡控制方法。与传统的电压平衡控制方法相比，该方案在平衡h桥间电容电压时综合考虑了消除耦合效应、平衡无功功率和提高动态性能三个方面。首先，推导了d-q参考系下的系统数学模型，揭示了h桥占空比修改之间的关系，以消除电压平衡控制对电流控制回路的耦合影响。然后，基于h桥功率模型，提出了无功平衡的定量化解决方案，设计了无功占空比修改方案。为了提高电压平衡控制的动态性能，采用动态参考设计方法对有功占空比修改进行评估。最后给出了仿真和实验结果，验证了所提方案的有效性。
In this article, an improved dc capacitor voltage balancing control is proposed for single-phase cascaded H-bridge (CHB) multilevel converters. Compared with conventional voltage balancing control methods, the proposed scheme has a comprehensive consideration of three aspects while balancing the capacitor voltages among H-bridges: coupling effect elimination, reactive power balancing, and dynamic performance improvement. First, the system mathematical model in the d–q reference frame is derived, and the relationship among duty cycle modifications of H-bridges is revealed to eliminate the coupling effect of voltage balancing control on the current control loop. Then, based on the H-bridge power model, a quantitative solution for reactive power balancing is presented to design the reactive duty cycle modifications. In order to enhance the dynamic performance of voltage balancing control, a dynamic references design method is adopted to evaluate the active duty cycle modifications. Finally, both simulation and experimental results are presented to validate the effectiveness of the proposed scheme.
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