LCL滤波并网逆变器双环控制参数设计与优化  

Parameters Design and Optimization of Dual-loop Controller for Grid-connected Inverters with LCL Filters

作　　者：殷进军[1] 刘邦银[1] 段善旭[1] 

机构地区：[1]强电磁工程与新技术国家重点实验室,华中科技大学,湖北省武汉市430074

出　　处：《电力系统自动化》2013年第9期123-128,共6页Automation of Electric Power Systems

基　　金：国家重点基础研究发展计划(973计划)资助项目(2010CB227206);国家自然科学基金资助项目(50907027)~~

摘　　要：并网逆变器中LCL滤波器的谐振峰可能引起系统不稳定。为了抑制谐振峰的影响,可以采用电容电流内环、并网电流外环的双电流环策略控制并网电流,但由于内外环都是电流环,其控制带宽相差不大,传统方法中内外环独立设计可能导致内外环控制器难以协调工作。文中提出了一种控制器参数整体设计及优化方法,采用少自由度的极点配置方法得到控制参数,在考虑系统具有一定稳定裕度的情况下基于时间乘以误差绝对值积分指标进行参数优化。采用该方法可避免控制参数的多次调整,同时具有良好的鲁棒性。在一台并网逆变器上的实验结果表明,所提出的整体参数设计与优化方法可使控制系统得到良好的动稳态性能。It is known that resonance of LCL filter may lead to instability of grid-connected inverters. A dual-loop current control strategy based on capacitor current loop is introduced to deal with the resonance problem of LCL filters. However, the tuning procedure is complex because the outer-loop and inner-loop controllers would not be operated well if the parameters of the controllers are not suitable in traditional methods. An integrated parameters design and optimization method is presented. The controller parameters are acquired by less degrees of freedom （DOF） pole assignment, and the parameters are optimized with integral of time multiplied by the absolute value of error （ITAE） performance index under certain stability margin. The proposed method is superior to traditional trial-and-error methods and shown to be robust. Experimental results verify the conveniences and the good dynamic and steady state performance of the proposed method. This work is supported by National Basic Research Program of China （973 Program） （No. 2010CB227206） and National Natural Science Foundation of China （No. 50907027）.

关 键 词：滤波器 并网逆变器 双电流环控制 参数设计 分布式发电 

分 类 号：TM464[电气工程—电器]