双向对称LLC谐振型DC/DC变换器设计及控制  

Design and Control of Bidirectional Symmetric LLC Resonant DC/DC Converter

作　　者：刘静一 吉攀攀 杨丰源[1,2] 高仕龙 LIU Jing-yi;JI Pan-pan;YANG Feng-yuan;GAO Shi-long(XJ Electric Co.,Ltd.,Xuchang 461000,China)

机构地区：[1]许继电气股份有限公司,河南许昌461000 [2]许继集团有限公司,河南许昌461000

出　　处：《电力电子技术》2022年第2期125-128,共4页Power Electronics

摘　　要：随着经济的发展和技术进步,配电网中负荷的类型日趋多样,其中直流负荷所占的比重不断增大,同时分布式电源尤其是直流分布式电源使用也越来越广泛,AC/DC/AC型拓扑的电力电子变压器(PET)成为关注的热点。其中,隔离级双向DC/DC变换环节是影响PET整体效率和功率密度的关键环节,有必要对其展开深入研究,应用较为广泛的隔离级双向DC/DC变换器主要为双有源桥(DAB)变换器和LLC谐振变换器。这里介绍了一种基于Buck-Boost和双向对称LLC谐振型的DC/DC变换器,阐述了该型DC/DC变换器的启动策略及运行控制策略,并对该拓扑及其控制策略进行了研究,通过试验验证了主回路拓扑参数设计的正确性及控制策略的有效性。With the development of the economy and technological advancement,the types of loads in the distribution network are increasingly diverse,and the proportion of direct current load is increasing.At the same time,distributed power sources,especially direct current distributed power sources,are becoming more and more widely used.AC/DC/AC type topology power electronic transformer(PET)has become a hot spot of concern.The isolation level bidirectional DC/DC conversion link is the key link affecting the overall efficiency and power density of PET.It is necessary to carry out in-depth research on it.The widely used isolation level bidirectional DC/DC converter is mainly dual active bridge(DAB)converter and LLC resonant converter.A DC/DC converter based on Buck-Boost and bidirectional sym-metric LLC resonance is introduced.The startup strategy and operation control strategy of the DC/DC converter are described.The topology and its control strategy are studied.Through experimental verification,the correctness of the design of the main loop topology parameters and the effectiveness of the control strategy are verified.

关 键 词：电力电子变压器 谐振变换器 启动策略 

分 类 号：TM4[电气工程—电器]