摘要
由于传统多电平逆变器存在电路结构复杂、功率器件多、控制复杂等缺点,提出一种单相双输入九电平逆变器,通过2个直流输入电源与电容的串并联实现九电平输出,拓扑结构简单,能够以较少的功率器件和电容数量产生更多的输出电平,谐波含量低,并且其多输入结构适用于分布式发电和微电网等领域。首先给出逆变器的电路结构和工作原理,然后设计逆变器调制策略,并分析电容充放电过程及其对电压波动的影响,实验结果验证了所提九电平逆变器及其调制策略的有效性和可行性。
Due to the disadvantages of traditional multi-level inverter,such as complex circuit structure,numerous power devices and complicated control strategies,a single-phase double-input nine-level inverter is proposed,which can output nine voltage levels through series and parallel connection of two DC input sources and a capacitor.The proposed inverter can generate desired voltage levels with lower number of power devices and capacitors,and has low harmonic contents.The multi-input inverter structure is suitable for distributed generation and microgrid.The topological structure and operation principle of the proposed inverter are given,and its pulse width modulation strategy is designed.Moreover,the processes of capacitor charging and discharging,and their inflences on voltage fluctuation are analyzed.Experimental results vali date the effectiveness and feasibility of the proposed nine-level inverter and its modulation strategy.
作者
王要强
王哲
周成龙
库若含
董亮辉
WANG Yaoqiang;WANG Zhe;ZHOU Chenglong;KU Ruohan;DONG Lianghui(School of Electrical Engineering,Zhengzhou University,Zhengzhou 450001,China)
出处
《电力自动化设备》
EI
CSCD
北大核心
2020年第4期172-177,共6页
Electric Power Automation Equipment
基金
国家自然科学基金资助项目(51507155)
河南省高等学校青年骨干教师项目(2019GGJS011)
郑州大学研究生教育研究项目(YJSJY201964)。
关键词
多电平逆变器
双输入
开关电容
脉宽调制
multi-level inverter
double-input
switched-capacitor
pulse width modulation
