适应负载大范围变动的高性能Z-源逆变器  

A High-Performance Z-Source Inverter Operating at Wide-Range Load

作　　者：丁新平[1] 钱照明[1] 崔彬[1] 彭方正[1] 

机构地区：[1]浙江大学电气工程学院,杭州310027

出　　处：《电工技术学报》2008年第2期61-67,共7页Transactions of China Electrotechnical Society

摘　　要：提出的高性能Z-源逆变器,在保持原逆变器优点的基础上(输出电压可任意升/降;允许逆变桥上下管直通状态,提高了逆变器的安全性),克服了其固有的缺点和局限性。Z-源逆变器直流链电压受Z-源网络电感和负载的影响很大,在网络电感值较小或负载较轻时,直流链电压会出现明显的电压畸变,影响逆变器输出的交流电压。本文所述高性能Z-源逆变器消除了由于网络电感值小或负载很轻而引起的直流链电压畸变,电路对负载的适应能力很强,能够工作在重载和轻载的任何环境,Z-源网络电感可以设计得很小,减少了重量、体积和成本。同时电路部分可实现逆变桥开关管的零电压导通,减小了开关损耗,改善了开关环境。通过对电路工作模式的详细分析,得出了电路各部分的电压关系,并推导出逆变器开关管的电流应力。最后,通过仿真和实验验证了理论分析的正确性。In this paper, a novel high-performance Z-source inverter is presented, which can overcome the inherent limitations and drawbacks of the traditional Z-source inverter （ZSI）, while maintaining its all advantages （Buck-Boost character, higher reliability, etc.）. The traditional Z-source inverter has dc-link voltage distortion during operating with either the small Z-source inductor or the light-load, thus decreases the performance of the Z-source inverter output voltage. The proposed inverter can operate at light-load with small Z-source inductor, and can eliminate the possibility of the dc-link voltage distortion. The inverter bridge switches may partly operate in ZVS turn-on condition, which decrease the switching loss and improve the switches operating environment. The voltage relationships, current stresses of the inverter switches, and control strategy for switch SW7 are described in detail. Finally, experimental results verify the validity of the proposed high-performance Z-source inverter.

关 键 词：Z-源逆变器 轻载 零电压开通软开关 电压畸变 

分 类 号：TM464[电气工程—电器]