电工技术学报  2022, Vol. 37 Issue (4): 964-975    DOI: 10.19595/j.cnki.1000-6753.tces.201166
电力电子 |
多相交错并联DC-DC变换器单电流传感器控制策略
郭强, 李山, 谢诗云, 杨奕
重庆理工大学重庆市能源互联网工程技术研究中心 重庆 400054
Single-Sensor Sampling Current Control Strategy of Multiphase Interleaved DC-DC Converters
Guo Qiang, Li Shan, Xie Shiyun, Yang Yi
Chongqing Energy Internet Engineering Technology Research Center Chongqing University of Technology Chongqing 400054 China
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摘要 针对多相交错并联DC-DC变换器相间均流问题,该文提出一种具有动态均流能力的单电流传感器控制策略。首先,根据变换器工作模态建立全息数学模型,深入分析造成相间电流不平衡的成因,推导出稳态下各相电流与寄生电阻、负载电流及占空比解析表达式。其次,考虑器件非理想特性,利用恒定占空比交替测试法估算各相寄生电阻;将电压环控制器输出量作为基准值,引入占空比补偿因子实现相间电流均衡。然后,基于系统小信号模型利用频域法对控制环路进行分析,辅助Matlab/SISO设计工具,优化控制器零点位置与环路增益,并利用根轨迹研究负载变化对系统稳定性影响;同时增加负载电流前馈补偿环路以降低输出阻抗,进一步改善系统动态性能。最后,搭建三相交错并联Buck变换器数字控制实验样机进行稳态与动态测试,其结果验证了所提出控制策略的可行性与正确性。
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关键词 交错并联变换器单电流传感器均流前馈控制    
Abstract:For multiphase interleaved DC-DC converters, current sharing among inductors is an important issue, so this paper proposes a single-sensor sampling current algorithm with current dynamic sharing capability. Firstly, a detailed mathematical model is presented according to the converter operation mode. The factors affecting current imbalance among phases are analyzed, and the analytical expressions of the phase current, parasitic resistance, load current and duty cycle are derived. Secondly, considering the non-ideal characteristics of the switches, all the parasitic resistances are estimated with constant duty-cycle test method by turning-on each phase. Taking the output of voltage loop controller as the reference value, the duty cycle compensation factors are introduced to obtain balanced inductor current. Besides, the control loop based on small-signal modeling is analyzed using the frequency-response method, and supported with the Matlab/SISO design tool, the zero position and loop gain of the controller are optimized. Stability against the load variations is investigated by means of the root locus analysis. Meanwhile, to further improve the dynamic performance, the feedforward control is implemented and the output impedance can be reduced dramatically. Finally, the experimental setup based on a three-phase interleaved Buck converter is constructed, and the steady-state and dymamic experimental results verify the correctness of the proposed control strategy.
Key wordsInterleaved converter    single-current sensor    current sharing    feedforward control   
收稿日期: 2020-09-06     
PACS: TM46  
基金资助:国家自然科学基金重点项目资助(51737001)。
通讯作者: 谢诗云 男,1987年生,博士,研究方向为无线电能传输与电力电子变换技术等。E-mail: xieshiyun1987@cqut.edu.cn   
作者简介: 郭强 男,1984年生,博士,研究方向为大功率变换器及其控制技术。E-mail: guoqiang@cqut.edu.cn
引用本文:   
郭强, 李山, 谢诗云, 杨奕. 多相交错并联DC-DC变换器单电流传感器控制策略[J]. 电工技术学报, 2022, 37(4): 964-975. Guo Qiang, Li Shan, Xie Shiyun, Yang Yi. Single-Sensor Sampling Current Control Strategy of Multiphase Interleaved DC-DC Converters. Transactions of China Electrotechnical Society, 2022, 37(4): 964-975.
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