3开关单级升压降压逆变器研究  

Research of Single-stage Boost-buck Inverter with Three-switch Devices

作　　者：叶满园[1] 蔡鸿[2] 宋平岗[1] 

机构地区：[1]华东交通大学电气与自动化工程学院,南昌330013 [2]江西省电力设计院,南昌330096

出　　处：《高电压技术》2016年第10期3092-3101,共10页High Voltage Engineering

基　　金：国家自然科学基金(51167006);江西省工业科技支撑计划项目(20161BBE50057);江西省自然科学基金(20161BAB206157)~~

摘　　要：针对于小型分布式发电机输入源变化范围较大的问题,提出一种3开关单级单相升压降压逆变器拓扑结构。该逆变器能够满足宽输入电压范围下的独立负载运行和并网发电运行,且具有器件最少、控制简单和效率高等优点。通过对该逆变器各个工作模式下的等效电路和数学建模进行分析,比较了断续导电模式(DCM)和连续导电模式(CCM)的区别,推导给出了DCM下的交流小信号模型,提出了闭环SPWM调制策略。最后通过仿真和实验验证表明,该新型逆变器拓扑能够实现直流输入电压从50 V到300 V的独立负载运行和并网运行,且输出电流波形满足并网要求,整机效率达到90%以上。In order to solve the problem that the input source of distributed generator system usually varies in a large scale, a new 3-switch single-stage single-phase buck-boost inverter is proposed. The inverter can meet a wide input voltage range with independent load operation and power grid operation, and it has the least switch, simple control, and high efficiency. By analyzing each working mode equivalent circuit and mathematical modeling, we compare the difference between discontinuous conduction mode（DCM） and continuous conduction mode（CCM） control mode, deduce the AC small signal model by DCM, and put forward a new closed-loop SPWM control strategy. The simulation and experimental results verify that this topology can operate under standalone and grid-connected when input voltage varies from 50 V to 300 V. Furthermore, output current waveforms can satisfy the requirements of grid, and the efficiency of whole inverter exceeds 90%.

关 键 词：分布式发电 升压降压逆变器 拓扑结构 并网发电 小信号模型 谐波失真 

分 类 号：TM464[电气工程—电器]