一种交错并联双Buck全桥型双向并网逆变器  

An Interleaved Dual-Buck Full-Bridge Type Bidirectional Grid-Connected Inverter

作　　者：王议锋 崔玉璐 马小勇 孟准 冀睿琳 Wang Yifeng;Cui Yulu;Ma Xiaoyong;Meng Zhun;Ji Ruilin(School of Electrical and Information Engineering Tianjin University,Tianjin 300072 China;State Grid Tianjin Economic Research Institute,Tianjin 300171 China;State Grid Tianjin Power Costumer Service Center,Tianjin 300210 China)

机构地区：[1]天津大学电气自动化与信息工程学院,天津300072 [2]国网天津市电力公司经济技术研究院,天津300171 [3]国网天津客服中心,天津300210

出　　处：《电工技术学报》2019年第21期4529-4539,共11页Transactions of China Electrotechnical Society

摘　　要：基于双Buck全桥变换器拓扑,提出一种交错并联型双向并网逆变器。该逆变器克服了传统H桥逆变器存在死区时间,且开关频率无法大幅度提升且桥臂存在直通危险的问题;为了在提高频率和功率密度的同时保证变换器效率,采用二通道交错并联结构,相同的输出电感电流纹波下,仅需要较小的电感量,同时还可以减小高频开关管的电流应力和损耗。该文对变换器的逆变和整流两种工作模式的工作原理与特性进行了分析;同时,以电感量最小为目标,综合考虑不同模式下滤波器设计要求,利用图解法对Buck电感和滤波器参数进行优化设计。在此基础上,构建损耗分析模型,计算并分析逆变和整流模式下的损耗分布。最后,搭建一台5kW的实验样机,对上述理论分析和计算进行验证,实验结果表明20%至满载范围内逆变器效率均高于98%。Based on the double-buck full-bridge converter topology,this paper proposes an interleaved parallel bidirectional grid-connected inverter.The proposed inverter can overcome the dead time of the traditional H-bridge inverter,greatly increase the switching frequency,and avoid the straight-through danger of bridge arm.In order to increasing the frequency and power density while ensuring the efficiency of the converter,a 2-channel interleaved parallel structure is adopted.Under the same output inductor current ripple,only a small amount of inductance is needed,and the current stress and loss of the high frequency switch tube can also be reduced.In this paper,the working principle and characteristics of the inverter and rectification modes of the converter are analyzed.At the same time,with the minimum inductance as the goal,the filter design requirements of different modes are comprehensively considered,and the Buck inductor and filter parameters were optimized using graphical methods.The parameters of the device are optimized.On this basis,the loss analysis model is constructed,and the loss distribution in the inverter and rectifier states is calculated and analyzed.Finally,this paper builds a 5kW experimental prototype,which verifies the above theoretical analysis and calculation.The efficiency of the inverter is higher than 98%from 20%to full load.

关 键 词：双Buck 交错并联 逆变 整流 滤波电感 

分 类 号：TM46[电气工程—电器]