摘要
双管Buck-Boost变换器拥有输入输出电压同极性和可升降压等特性,适合于两级式光伏并网逆变器中前级直流变换,但其同步开关方式需要较大的储能电感,且组合式开关方式控制电路复杂、实现工作模式无缝切换较困难。提出一种交错开关型双管Buck-Boost变换器,可使储能电感最小、控制电路简单,并实现无工作模式切换。分析了该变换器的工作原理和特性,比较3种开关方式下几个主要特性的优劣。最后通过一台3kW两级式并网逆变器,验证了所提变换器工作原理的正确性。
Charactered with noninverting and step up/down conversion,the double-switch Buck-Boost converter is suit for the front stage of the two-stage photovoltaic （PV） grid-connected inverter. But,the large inductor is needed in conventional control strategy,and the sophisticated control logic and difficult compensation technique for smooth transitions are included in combinatorial control strategy. In order to reduce the inductor and simplify the control logic,an interleaving control strategy was proposed. The operation principle of the proposed control strategy and the characteristics were analyzed,and several indexes in different control strategies were compared. Finally,the interleaving operation principle was verified by a 3 kW two-stage PV grid-connected inverter prototype.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2010年第21期7-12,共6页
Proceedings of the CSEE
基金
江苏省自然科学基金(BK2008391)
江苏省普通高校研究生科研创新计划项目(CX08B_070Z)~~
