用于含高次谐波分量多谐振变换器的扩展型建模分析方法  

An Extended Describing Modeling Method for the Multi-Resonant Converter with High Order Harmonic Components

作　　者：韩富强[1] 王议锋[1] 李占纯 冀睿琳 刘瑞欣 Han Fuqiang;Wang Yifeng;Li Zhanchun;Ji Ruilin;Liu Ruixin(Key Laboratory of Smart Grid of Ministry of Education Tianjin University,Tianjin 300072 China;State Grid Tianjin Electric Power Corporation Chengxi District Supply Company,Tianjin 300113 China;State Grid Tianjin Power Costumer Service Center,Tianjin 300210 China)

机构地区：[1]天津大学智能电网教育部重点实验室,天津300072 [2]国网天津市电力公司城西供电分公司,天津300113 [3]国网天津客服中心,天津300210

出　　处：《电工技术学报》2019年第24期5166-5175,共10页Transactions of China Electrotechnical Society

基　　金：国家重点研发计划“智能电网技术与装备”重点专项“中低压直流配用电系统关键技术及应用(2018YFB0904700)”资助项目。

摘　　要：提出一种用于含高次谐波分量多谐振变换器的扩展型建模分析方法。以五谐振元件LCLCL变换器为例,经合理的参数设计,其能同时传递基波和3次谐波有功功率,提高谐振电流利用率。该文首先阐述了传统基波等效分析法的建模原理和不足,通过将变换器的非线性输出单元用一个等效阻抗来代替,构建出扩展型建模方法。然后,针对电流连续导通模式和断续导通模式两种情况分别讨论,由此得到变换器的直流电压增益表达式。最后,搭建了一台额定功率为500W的实验样机,通过理论计算和仿真、实验结果的对比,验证了该文所提建模方法的有效性和准确性。同时,变换器取得了全负载范围内的软开关特性。其最高效率为95.46%,且在轻载下也能够保持较高的转换效率。An extended describing modeling method for multi-resonant converters with high order harmonics is proposed in this paper.Through the appropriate parameter design,the five-element LCLCL converter is able to transfer the fundamental and the third-order harmonic active power simultaneously.It results in the promoted utilization rate of the resonant current.The modeling principle and shortcomings of the traditional fundamental harmonic approximation method are analyzed in detail.By employing an equivalent impedance to substitute the non-linear output cell of the converter,the proposed extended describing method is built.Besides,the continuous and discontinuous rectifier current operating conditions are considered,and the expression of DC voltage gain is obtained.Finally,a 500 W prototype is built in the laboratory.The feasibility of the proposed method is verified by theoretical calculations,simulations and experimental results.Outstanding soft-switching characteristics are achieved in the whole load range.The highest efficiency is 95.46%,and relatively high conversion efficiency is guaranteed under light load as well.

关 键 词：高次谐波分量 多谐振 谐振电流利用率 基波等效法 非线性输出单元 高转换效率 

分 类 号：TM46[电气工程—电器]