级联型逆变器载波周期脉冲调整的功率均衡方法及特性分析  

Power Balance Method and Characteristic Analysis Based on Carrier Period Pulse Adjustment for Cascaded Inverter

作　　者：陈仲[1] 孙健博 章修齐 许亚明[1] 汪柯文 Chen Zhong;Sun Jianbo;Zhang Xiuqi;Xu Yaming;Wang Kewen(Jiangsu Key Laboratory of New Energy Generation and Power Conversion Nanjing University of Aeronautics and Astronautics,Nanjing 211106 China)

机构地区：[1]南京航空航天大学江苏省新能源发电与电能变换重点实验室

出　　处：《电工技术学报》2019年第22期4761-4771,共11页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51877106);江苏省“六大人才高峰”(2014-JNHB024)资助项目

摘　　要：对于级联H桥型逆变器,传统载波同相层叠调制策略和载波移相调制策略均无法使逆变器既具有最优线电压谐波特性,又能够实现级联单元间的功率均衡。为此,提出一种载波周期脉冲调整的功率均衡方法,此方法基于载波控制自由度,以载波周期为单位对传统载波排列进行调整;阐明了三单元载波分布的特征规律,仅需满足在第二层各级联单元载波均匀分布,即可以较少的载波数量在单位输出周期内实现级联单元间的功率均衡,且逆变器具有与传统载波同相层叠调制策略相同的线电压谐波特性。与此同时,详细推导了任意调制比和功率因数角下的级联单元输出特性,表明所提功率均衡方法的功率均衡效果不受调制比与功率因数角影响。仿真与实验结果验证了理论分析的正确性和功率均衡控制方法的可行性。For cascaded H-bridge inverter, the traditional phase disposition modulation strategy and phase shifted modulation strategy cannot simultaneously make inverter have the optimal line voltage harmonic characteristics and achieve power balance. Therefore, a power balance control method with carrier period pulse adjustment was proposed. Based on the carrier control degree of freedom, the proposed method adjusted the traditional carrier arrangement in carrier period, and then clarified the carrier distribution characteristic rule of three-cell inverter. It only needs to meet the uniform distribution of cascaded cells carriers in the second layer so that the power balance can be achieved within one output period with a smaller number of carriers. Moreover, the inverter has the same line voltage harmonic characteristics as the traditional phase disposition modulation strategy. Meanwhile, the output characteristics of cascaded cells under arbitrary modulation ratio and power factor angle were deduced in detail, which shows that the performance of proposed power balance method is not affected by modulation ratio and power factor angle. Simulation and experimental results verified the correctness of theoretical analysis and feasibility of power balance control method.

关 键 词：级联H桥 功率均衡 脉冲调整 特征规律 特性分析 

分 类 号：TM46[电气工程—电器]