基于极点配置的LCL滤波并网逆变器电流控制策略  

Current Control Strategy Based on Pole Placement for Grid-connected Inverters with LCL Filters

作　　者：许津铭[1] 谢少军[1] 唐婷[1] 

机构地区：[1]南京航空航天大学自动化学院,江苏省南京市210016

出　　处：《电力系统自动化》2014年第3期95-100,105,共7页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(51077070);江苏省普通高校研究生科研创新计划资助项目(CXZZ12_0153);江苏省科技支撑计划资助项目(BE2010188)~~

摘　　要：LCL滤波并网逆变器具有良好的应用前景。针对其电流控制,文中在分析了传统的单进网电流闭环方案局限性的基础上,结合有源阻尼控制机理,提出了一种基于极点配置的进网电流控制思想。其内环为极点配置环路,外环为进网电流比例—积分控制,可实现高带宽的电流控制。进一步提出内环配置两个极点为基波共轭极点,另两个极点为谐振频率处共轭极点的方案,实现谐振峰的有效抑制及基波频率处的高增益。分析并推演了其实现方法,包括反馈的选择和参数设计。最后,详细分析了所述方案控制性能并给出了实验验证。The grid-connected inverter with an LCL filter has good application prospects.In connection with its current control, the limitations of the conversional single current closed-loop control are analyzed,and by referring to the active damping control mechanism,apole placement-based current control strategy is proposed.Through proper feedback,the inner control is enabled to achieve pole placement and the outer grid current control to guarantee a high bandwidth with proportional and integral control.Then,a novel placement strategy is proposed,where two of the four poles are conjugate poles at fundamental frequency,and the remaining two are conjugate poles at resonance frequency.Consequently,damping of the resonance peak and high loop gain at the fundamental frequency are both obtained.The implementation including feedback choice and parameter design is dealt with and derived.Finally,the control performance is investigated and verified by experiment.

关 键 词：并网逆变器 LCL滤波器 有源阻尼 谐振控制 极点配置 电流控制 

分 类 号：TM464[电气工程—电器]