电工技术学报  2020, Vol. 35 Issue (24): 5142-5151    DOI: 10.19595/j.cnki.1000-6753.tces.191461
电力电子 |
基于大信号模型的多模块LCC级联变换器输出电压不均衡分析法
伍梁, 孙晓玮, 赵钧, 陈国柱
浙江大学电气工程学院 杭州 310027
Analysis of Output Voltage Imbalance for Cascaded Multi-Module LCC Converters Based on Large-Signal Model
Wu Liang, Sun Xiaowei, Zhao Jun, Chen Guozhu
College of Electrical Engineering Zhejiang University Hangzhou 310027 China
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摘要 相对于单模块LCC变换器,输入并联输出串联(IPOS)多模块LCC级联变换器的拓扑具有模块化、元件电气应力小、输出纹波小、输出电压高、功率大等优势,但是各模块间谐振参数的偏差会引起模块输出电压不均衡。该文针对容性滤波的LCC谐振变换器,采用基波等效法计算出变换器电压电流的基波分量,利用广义状态空间平均法建立LCC变换器的状态方程,随后推导出单模块的LCC变换器大信号模型。在此基础上,推导出IPOS两模块LCC变换器的大信号模型,并以此模型来分析谐振参数偏差对模块间输出电压均衡的影响。最后搭建两模块LCC变换器的样机平台,验证了所提出的多模块LCC变换器大信号模型具有良好的准确度,所提模型可为谐振参数的容差分析提供依据。
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关键词 多模块LCC谐振变换器大信号模型谐振参数偏差输出电压不均衡    
Abstract:Compared with the single-module LCC converter, the multi-module LCC converters with input parallel output series (IPOS) have the advantages of modularity, small component electrical stress, small output ripple, high output voltage and high power. However, the deviation of the resonant tank parameters between the modules will cause the unbalanced module output voltage. In this paper, for the LCC resonant converter with the capacitive filter, the fundamental components of the voltage and current of the converter were calculated by the fundamental wave approximation. The state equation of the LCC converter was established adopting the generalized state-space averaging method. Then, the large-signal model of the single-module LCC converter was derived. On this basis, the large-signal model of the two-module LCC converter with input parallel and output series was derived. Through the large-signal model, the influence of the deviation of the resonant tank parameters on the output voltage balance between modules was analyzed. Finally, a prototype of the two-module LCC converter is built, which shows that the proposed large-signal model of multi-module LCC converter has good accuracy. The proposed model can provide a basis for the tolerance analysis of resonant tank parameters.
Key wordsMulti-module    LCC resonant converter    large-signal model    resonant parameters deviation    output voltage imbalance   
收稿日期: 2019-11-11     
PACS: TM46  
基金资助:国家自然科学基金资助项目(51777186)。
通讯作者: 陈国柱 男,1967年生,博士,教授,博士生导师,研究方向为高性能电力电子系统及其先进数字控制。E-mail: gzchen@zju.edu.cn   
作者简介: 伍梁 男,1992年生,博士研究生,研究方向为LCC谐振变换器控制策略及其模块化级联技术。E-mail: wuliang2015@zju.edu.cn
引用本文:   
伍梁, 孙晓玮, 赵钧, 陈国柱. 基于大信号模型的多模块LCC级联变换器输出电压不均衡分析法[J]. 电工技术学报, 2020, 35(24): 5142-5151. Wu Liang, Sun Xiaowei, Zhao Jun, Chen Guozhu. Analysis of Output Voltage Imbalance for Cascaded Multi-Module LCC Converters Based on Large-Signal Model. Transactions of China Electrotechnical Society, 2020, 35(24): 5142-5151.
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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.191461          https://dgjsxb.ces-transaction.com/CN/Y2020/V35/I24/5142