摘要
提出一种直通物理分离型Z源逆变器,通过在传统阻抗网络拓扑结构上引入1个二极管、1个电容和1个全控型器件,有效降低了启动冲击电流和Z源网络电容电压应力,实现了升压因子和调制因子的解耦控制,提高了Z源网络的升压能力。基于直通物理分离型Z源逆变器数学模型,研究了以并网电流控制为内环、直流母线电压控制为外环的双闭环PI控制方案。在理论分析的基础上,对直通物理分离型Z源逆变器并网进行仿真及实验研究,结果表明:系统启动电流冲击小,并网功率因数高,鲁棒性强,动态性能稳定,验证了拓扑结构的正确性和控制策略的优越性。
An IST-ZSI(Isolated Shoot-Through Z-Source Inverter) topological structure is proposed,which adds a diode,a capacitor and an entirely-controllable device to the traditional impedance network to effectively reduce the startup inrush current and the voltage stress of Z-source network capacitor,realize the decoupling control between Boost factor and modulation index,and improve the Boost capability of Z-source network. A double close-loop PI control scheme,including the grid-connecting current control inner-loop and the DC-link voltage control outer-loop,is studied based on the mathematical model of IST-ZSI. The IST-ZSI grid- connection is studied based on the theoretical analysis via simulation and experiment,and the simulative and experimental results show that,the system with IST-ZSI has lower startup inrush current,higher grid- connection power factor,stronger robustness and better dynamic performance ,verifying the correctness of the proposed topology and the superiority of its control strategy.
出处
《电力自动化设备》
EI
CSCD
北大核心
2014年第7期1-8,共8页
Electric Power Automation Equipment
基金
国家自然科学基金资助项目(51377168)
科技部创新基金资助项目(11C26223702363)
山东省科技发展计划基金资助项目(2011GGH20411)~~
关键词
Z源逆变器
并网
解耦控制
电压控制
直通零矢量
仿真
Z-source inverter
grid-connection
decoupling control
voltage control
shoot-through zero vector
computer simulation