基于过谐振调频扩展移相控制的CLLC谐振变换器电流优化策略  

Current Optimization Strategy for CLLC Resonant Converter Based on Over-resonant Frequency Modulation and Extended Phase-shift Control

作　　者：王翌琛 王丰[1] 卓放[1] 于克凡 WANG Yichen;WANG Feng;ZHUO Fang;YU Kefan(School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]西安交通大学电气工程学院,陕西省西安市710049

出　　处：《电力系统自动化》2025年第3期178-188,共11页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(52077173)。

摘　　要：电容-电感-电感-电容(CLLC)谐振变换器是一种运行效率高、软开关特性好,适用于直流电力系统的隔离型双向DC/DC变换器。然而,谐振变换器采用的传统调频控制仅包含一个控制变量,难以同时维持变换器输出电压稳定并兼顾谐振电流优化。为了提升CLLC谐振变换器的整体运行效率,提出了一种基于粒子群优化算法的过谐振调频扩展移相控制方法。此控制方法在调频控制的基础上引入了2个移相型控制变量,增加了CLLC谐振变换器的控制自由度。同时,基于精准时域模型并使用粒子群优化算法,可以明确变换器采用过谐振调频扩展移相控制方法时的最优工作点,从而有效地提升变换器不同工况下的运行效率。最后,通过一台2kW级实验样机验证了所提电流优化方法的可行性。The capacitor-inductor-inductor-capacitor(CLLC)resonant converter is an isolated bidirectional DC/DC converter with high operating efficiency and good soft switching characteristics,which is suitable for DC power systems.However,the traditional frequency modulation control used in resonant converters involves only one control variable,which makes it difficult to simultaneously maintain stable output voltage of the converter and optimize the resonant current.To enhance the overall operating efficiency of the CLLC resonant converter,this paper proposes an over-resonant frequency modulation and extended phase-shift control method based on the particle swarm optimization algorithm.This control method introduces two phase-shift control variables based on the frequency modulation control method,which increases the freedom degree of controlling the CLLC resonant converter.Moreover,based on the accurate time-domain model and utilizing the particle swarm optimization algorithm,the optimal operating point of the converter can be explicitly determined when employing the over-resonant frequency modulation and extended phase-shift control method.Thus,the operating efficiency of the converter under different operation conditions is significantly improved.Finally,the feasibility of the proposed current optimization method is verified through a 2 kW-level experimental prototype.

关 键 词：直流电力系统 谐振变换器 粒子群优化算法 过谐振调频扩展移相控制 谐振电流优化 时域模型 

分 类 号：TM4[电气工程—电器]