Modeling and controller optimization for current-fed isolated bidirectional DC–DC converters
Modeling and controller optimization for current-fed isolated bidirectional DC–DC converters
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DOI：
10.1007/s43236-020-00139-y
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发表时间：
2020-09
影响因子：
1.4
通讯作者：
Zhao Zhang;Shaojun Xie;Xiaofeng Shang;Qiang Qian;Jinming Xu
中科院分区：
文献类型：
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作者：
Zhao Zhang;Shaojun Xie;Xiaofeng Shang;Qiang Qian;Jinming Xu
电流型隔离式双向DC-DC转换器在蓄电池储能系统中起着重要的作用。然而，由于缺乏精确的数学模型进行优化，传统的比例积分控制器的闭环系统动态响应速度较慢。本文提出了一个简单、精确的数学模型来描述CF-IBDC的大信号和小信号行为。全阶连续模型能够准确地捕捉系统的动态行为，覆盖所有的运行状态。推导了小信号模型，发现直流滤波电感和钳位电容是不稳定的自然原因。基于这一发现，提出了特殊的控制器来优化全闭环控制系统的动态响应。该控制器大大缩短了CF-IBDC的动态响应时间。通过仿真验证了模型的正确性和优化后的闭环系统的动态响应。
Current-fed isolated bidirectional DC–DC converters (CF-IBDCs) play an important role in battery energy storage systems. However, the closed-loop dynamics is rather slow with conventional proportional–integral controllers because a precise mathematic model remains absent for optimization. In this paper, a simple precise mathematical model is presented to describe the large and small-signal behaviors of the CF-IBDC. The full-order continuous model can accurately capture the dynamic behaviors and cover all operation conditions. The small-signal model is derived, and the DC filter inductors and clamp capacitors are found to be the natural causes of instability. Based on this finding, special controllers are proposed to optimize the dynamic response of the full closed-loop control system. The dynamic response time of the CF-IBDC is greatly reduced with the proposed controller. The correctness of the presented model and the dynamic response of the optimized closed-loop control system are verified by simulations.