基于滑模控制的新型三相双频并网逆变器  

Three-phase double-frequency grid-connected inverter based on sliding mode control

作　　者：侯世英[1] 宋星[1] 孙韬[1] 张闯[1] 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400044

出　　处：《电力自动化设备》2011年第12期39-43,共5页Electric Power Automation Equipment

基　　金：输配电装备及系统安全与新技术国家重点实验室自主研究项目(2007DA10512709304)~~

摘　　要：提出了一种用于可再生能源发电的新型三相双频并网逆变器,该新型双频并网逆变器的高频单元由三相四开关并网逆变器构成,决定输出电流性能;其低频单元由2个单相半桥逆变器构成,主要负责输出功率,用于降低开关损耗,提高系统效率。该新型拓扑较之三相全桥双频并网逆变器减少了4个开关管和1个大电感,大幅降低了系统成本,同时由于开关数的减少,开关损耗得到进一步减小。为了使新拓扑获得很好的自适应性和较强的鲁棒性,在分析其工作原理的基础上研究了高频单元的滑模控制。仿真结果表明,采用滑模控制后的新型三相双频并网逆变器表现出很好的动态和稳态性能,且输出的并网电流谐波含量低,波形质量好。A kind of three-phase double-frequency energy power generation. Its high frequency unit grid-connected inverter is proposed for renewable consists of a three-phase four-switch grid-connected inverter to improve the performance of output current and its low frequency unit consists of two single-phase half-bridge power-output inverters to reduce the switching loss and enhance system efficiency. Compared with three-phase full-bridge double-frequency grid-connected inverter,it saves four switches and an inductor,resulting in less switching loss and cost. The sliding mode control strategy of its high-frequency unit is researched to enhance its adaptability and robustness. Simulative results show that,the proposed inverter with sliding mode control has better dynamic and static performances,with less output current harmonics and better waveform quality.

关 键 词：逆变器 开关损耗 低成本 滑模控制 鲁棒性 拓扑 

分 类 号：TM464[电气工程—电器]