Boost-Buck光伏接口变换器控制策略研究  

Research on Control Strategy of Boost-Buck Converter as Photovoltaic Interface

作　　者：何汀[1] 杨晨[1] 谢少军[1] 

机构地区：[1]南京航空航天大学,江苏南京210016

出　　处：《电力电子技术》2013年第6期44-46,共3页Power Electronics

摘　　要：级联应用的Buck和Boost变换器具有简单、高效、非隔离及宽电压输入范围等优点,常用作直流微网光伏接口变换器。实际应用中,需对其设计合适的控制策略以满足直流微网运行外特性要求,此外还需解决当变换器工作在高效率的单管模式时,升、降压模态的平滑切换问题。以Boost-Buck变换器为研究对象,设计了一种控制策略实现外特性要求。同时分析了模态过渡问题产生的原因,给出加入双管降频工作区间的解决方法。研制样机对控制策略进行了验证,实验结果表明所提出的控制策略能实现变换器的高效率和平滑运行,满足直流总线供电系统控制要求。With the advantages such as simplicity,high efficiency, non-isolation and wide range of input voltage, con- verters consisting of cascaded Boost and Buck converter are constantly used in interfacing the photovohaic arrays of DC power grid.In practical applications, control strategies shall be carefully designed to meet the demands of the DC power micro-grid.Moreover,the output voltage transients problem appears during mode switching period should be sloved.A close-loop controller is designed for working with proper output features.The discontinuity due to devices switching time is analyzed, and a technique is proposed accordingly.Experimental results are presented to validate the proposed theory.

关 键 词：变换器 光伏接口 直流微网 控制策略 

分 类 号：TM46[电气工程—电器]