摘要
电感-电容-电感(LCL)型谐振变换器具有零电压开通(ZVS)特性好、双向功率传输、效率高等优点,但是传统的脉冲频率调制(PFM)策略在轻载下存在电压失调、效率低等问题。因此,多移相调制成为了双向LCL变换器的主要调制策略,其中三移相(TPS)调制是自由度最多、效率最高的。然而,现有文献在采用TPS策略时将开关频率设为恒定值,因此,变换器的效率仍有提升空间。本文提出一种基于多谐波频域模型的双向LCL变换器PFM+TPS四自由度优化调制策略。首先,建立双向LCL变换器的多谐波频域模型,求解出谐振腔电压和电流的解析表达式,克服传统基波分析法精度低的问题。然后,针对4种移相调制策略和提出的PFM+TPS策略分别进行优化设计,并对各种策略下的最优解进行定量对比,衡量ZVS特性和原副边电流有效值平方和这两方面性能。最后,搭建一台900 W的双向LCL变换器样机,实验测得PFM+TPS策略下变换器的峰值效率相较于TPS策略提升了1.55%。理论和实验验证了多谐波频域模型的准确性和PFM+TPS调制策略的优越性。
Inductor-capacitor-inductor(LCL)resonant converter possesses the advantage of zero voltage switching(ZVS),bidirectional power flow capability,high efficiency,etc.But the output voltage tends to be unregulated and the efficiency deteriorates under light load with traditional pulse frequency modulation(PFM)strategy.Therefore,the common modulation strategy for bidirectional LCL resonant converter is multiple phase shift,among which triple phase shift(TPS)has the most control degrees-of-freedom and can reach the highest efficiency.However,existing literatures set the switching frequency as a fixed value when adopting TPS strategy,so there is still room for improvement of the converter efficiency.An optimized PFM+TPS four degrees-of-freedom modulation strategy was proposed for bidirectional LCL converter based on multiple harmonic frequency domain model.First,multiple harmonic frequency domain model of bidirectional LCL converter is set up,and analytical expressions of the voltage and current of the resonant tank were calculated,which overcomes the drawback of low accuracy of the traditional method using first harmonic approximation.Then,optimized design for four different phase shift modulation strategies and PFM+TPS modulation strategy proposed were carried on,and optimal results for each strategy were quantitatively compared from two perspectives,namely the ZVS characteristics and the sum of square of the root mean square value of the primary side current and secondary side current.Finally,a 900 W bidirectional LCL converter prototype was built.Compared with TPS strategy,the peak efficiency of the converter with PFM+TPS strategy increases by 1.55%from experimental measurement.The theoretical and experimental results demonstrate accuracy of the multiple harmonic frequency domain model and the superiority of the proposed PFM+TPS modulation strategy.
作者
曲圣
李佳
李子昂
张硕
杨东醒
徐墨尘
韦玉麒
QU Sheng;LI Jia;LI Ziang;ZHANG Shuo;YANG Dongxing;XU Mochen;WEI Yuqi(School of Electric Engineering,Xi’an Jiaotong University,Xi’an 710049,China;School of Automation,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;State Key Laboratory of Space Power-Sources,Shanghai Institute of Space Power-Sources,Shanghai 200245,China)
出处
《电机与控制学报》
北大核心
2025年第10期1-15,共15页
Electric Machines and Control
基金
国家自然科学基金青年基金(52307221)
四川省高效电源变换技术工程研究中心基金
空间电源全国重点实验室开放课题(LAPS23019)。
关键词
双向隔离LCL谐振变换器
多谐波频域模型
多自由度调制策略
优化设计
变换器效率
零电压开通
isolated bidirectional LCL resonant converter
multiple harmonic frequency domain model
multiple degrees-of-freedom modulation strategy
optimal design
converter efficiency
zero-voltage-switching
作者简介
曲圣(2002-),男,硕士研究生,研究方向为双向直流-直流变换器的建模、控制和优化设计;李佳(1996-),女,博士,讲师,研究方向为电力电子变换器、优化调制、参数设计;李子昂(2000-),男,博士研究生,研究方向为谐振变换器的建模、轨迹控制和设计方法;张硕(2001-),男,博士研究生,研究方向为谐振变换器的建模、控制和优化设计;杨东醒(2003-),男,硕士研究生,研究方向为高功率密度磁结构设计与高效直流-直流变换器设计;徐墨尘(1995-),男,硕士,研究方向为功率变换器;通信作者:韦玉麒(1995-),男,博士,教授,博士生导师,研究方向为高性能谐振变换器、超低温电力电子技术以及宽禁带半导体器件。
