摘要
对基于双移相桥直流变换器的双级式储能变流器进行研究,分析其工作原理,并在此基础上建立损耗模型。传统的双级式储能变流器均借鉴脉宽调制(pulse width modulation,PWM)整流器的双环控制,将直流电压控制为恒定值,存在优化空间。提出一种直流母线电压优化控制策略,相比传统的定电压控制方法,此方法以损耗优化为目标,将直流母线电压调节至损耗最低点,从而提升整机效率,同时限定母线电压的上下限以保证变流器出力。详细介绍所提方法的工作取策略。最后搭建样机,通过实验验证损耗模型和控制算法的正确性与可行性。
This paper described the principle of a double-stage energy storage converter based on dual active bridge, as well as its loss model. Traditional double-stage energy storage converter keeps the DC-link voltage as a constant value, which is similar to PWM rectifier. This paper investigated the power loss distribution of medium frequency isolated power conversion system. Then a method of DC-link voltage optimization was proposed to improve the overall efficiency. This method controls DC-link voltage to different values according to different conditions to obtain the lowest power loss. Therefore, the efficiency is higher compared to traditional control method. Experimental results verify the feasibility of optimized DC-link voltage control method.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2015年第17期4477-4485,共9页
Proceedings of the CSEE
基金
国家863高技术基金项目(2011AA05A111)
上海市科委项目(12dz1200200)~~
关键词
电池储能
中频隔离型储能变流器
效率优化
双移相桥
battery energy storage
medium frequency isolated power conversion system
efficiency optimization
dual active bridge
