摘要
串联谐振间接矩阵型电力电子变压器(PET)通过高频开关并减小直流电容容值可实现高功率密度。然而,小直流电容会改变谐振回路等效电容,并影响高频谐振电流特性,进而影响零电流软开关(ZCS)的实现。该文建立小直流电容下串联谐振间接矩阵型PET等效电路,推导高频电流时域解析表达式,并对ZCS条件下的开关频率进行设计,揭示直流电容和死区时间对开关频率的影响规律。仿真和实验结果验证了该文理论分析的正确性。
Series resonant indirect matrix type power electronic transformer(PET)can achieve high power density by high frequency switching and reducing dc capacitance.However,small dc capacitors will change the equivalent capacitance of the resonant circuit and affect the high frequency resonant current characteristics.Then,the zero current switching(ZCS)may be lost.In this paper,the equivalent circuit of the series resonant indirect matrix type PET with small dc capacitors is established.Analytical expression of high frequency current in time domain is derived,and switching frequency is designed to achieve ZCS.The influence of dc capacitance and dead time on switching frequency is revealed.Simulation and experimental results verify the correctness of the theoretical analysis.
作者
胡钰杰
李子欣
罗龙
赵聪
李耀华
Hu Yujie;Li Zixin;Luo Long;Zhao Cong;Li Yaohua(Key Laboratory of Power Electronics and Electric Drive Institute of Electrical Engineering Chinese Academy of Science,Beijing 100190 China;University of Chinese Academy of Sciences,Beijing 100049 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2022年第6期1442-1454,共13页
Transactions of China Electrotechnical Society
基金
国家自然科学基金资助项目(52007180)。
