摘要
针对太阳能无人机高效发电系统的应用需求,提出集成光/储一体化设计的LLC谐振型三端口DC-DC变换器拓扑及其先进控制策略.采用时域分析的方法,对该三端口变换器在不同功率传输模式下谐振腔具有的多种工作模式进行分析,并采用移相控制实现对3个端口之间功率的灵活控制.为了得到准确的变换器增益特性的数学表达式,采用多项式近似的方法,拟合时域分析得到的增益曲面,并在此基础上提出解耦控制策略.解耦环路的设计能够有效降低三端口变换器多控制环路之间的功率耦合程度,优化动态性能.搭建500 W的试验样机,对该三端口电路拓扑的稳态运行特征、模式动态切换过程以及解耦环路的设计进行验证.实验结果表明,该时域分析方法能够准确描述电路特征,同时解耦环路能够有效降低控制环路之间的功率耦合程度,提升系统的动态响应性能.
A LLC resonant three port DC-DC converter with integrated photovoltaic and storage design and its advanced control strategy were proposed,for the application requirements of solar powered UAV’s energy manager.Firstly,time-domain analysis was used to analyze the multiple operating modes of the resonant tank of the three-port converter under different power transmission modes.Phase shift control was used to achieve the flexible power control among the three ports.Secondly,polynomial approximation was used to fit the gain surface obtained from time-domain analysis to obtain an accurate mathematical expression for the gain characteristics of the converter.On this basis,a decoupling control strategy was proposed.The design of the decoupling loop could effectively reduce the power coupling degree between multiple control loops of the three-port converter and optimize its dynamic performance.Finally,a 500 W experimental prototype was built,to verify the steady-state operating characteristics,dynamic mode switching process,and decoupling loop design of the three-port topology.The experimental results verified that the time-domain analysis method could accurately describe the circuit characteristics,and the decoupling loop could effectively reduce the degree of power coupling between control loops and improve the dynamic response performance of the system.
作者
王子钰
石健将
WANG Ziyu;SHI Jianjiang(College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China)
出处
《浙江大学学报(工学版)》
北大核心
2025年第6期1322-1332,共11页
Journal of Zhejiang University:Engineering Science
基金
国家自然科学基金资助项目(52077199).
