State Space Analysis of Flying Capacitor Multilevel DC-DC Converters for Capacitor Voltage Estimation
State Space Analysis of Flying Capacitor Multilevel DC-DC Converters for Capacitor Voltage Estimation
复制标题
用于电容器电压估计的飞跨电容器多电平 DC-DC 转换器的状态空间分析
DOI：
10.1109/apec.2019.8722230
复制
发表时间：
2019
期刊：
影响因子：
--
通讯作者：
J. Stauth
中科院分区：
文献类型：
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作者：
Ziyu Xia;Benjamin L. Dobbins;Jan S. Rentmeister;J. Stauth
飞跨电容多电平（FCML）变换器在DC-DC变换器中有着广泛的应用前景，但存在飞跨电容电压平衡问题。已经开发了各种技术来调节飞跨电容器电压，但是仍然需要准确地测量它们并理解平衡算法的一般限制。这项工作提出了一种准确，鲁棒性和灵活的方法来估计飞跨电容电压状态，通过采样测量的开关节点电压。一个状态空间模型，揭示了必要条件的可观性和可控性的发展。探讨了无法实现估计和平衡的情况;重要的是，本文制定的标准指出了消除这些情况的简单方法。最后，通过一个6电平FCML硬件原型验证了该方法的有效性.
Flying capacitor multilevel (FCML) converters show great promise for a number of DC-DC applications, but are subject to problems with voltage balance on the flying capacitors. A variety of techniques have been developed to regulate the flying capacitor voltages, but there is still a need to accurately measure them and understand the limitations of balancing algorithms in general. This work proposes an accurate, robust, and flexible way to estimate flying capacitor voltage states through sampled measurements of the switching node voltage. A state space model which reveals the necessary conditions for observability and controllability is developed. Scenarios where estimation and balancing cannot be achieved are explored; importantly, the criterion developed herein points to simple ways to eliminate these scenarios. The results are verified with a 6-level FCML hardware prototype.