基于LLCL型并网逆变器的复合控制方法  

Composite Control Method Based on LLCL Grid-connected Inverter

作　　者：刘洋 杨旭红 郭凯 吴斌 陈昊 张云飞 LIU Yang;YANG Xu-hong;GUO Kai;WU Bin;CHEN Hao;ZHANG Yun-fei(College of Automation Engineering,Shanghai University of Electric Power,Shanghai 200090,China;State Grid Binzhou Power Supply Company,Binzhou 256600,China;State Grid Wenzhou Power Supply Company,Wenzhou 325000,China)

机构地区：[1]上海电力大学自动化工程学院,上海200090 [2]国网滨州供电公司,滨州256600 [3]国网温州供电公司,温州325000

出　　处：《科学技术与工程》2020年第33期13688-13696,共9页Science Technology and Engineering

基　　金：上海市电站自动化技术重点实验室项目(13DZ2273800);上海市重点科技攻关计划(14110500700)。

摘　　要：电感-电感-电容-电感(LLCL)型并网逆变器因存在串联谐振支路,能够极大地衰减开关频率处的电流谐波成分。在两相静止αβ坐标系下,采用双闭环控制策略对并网电流直接进行控制。比例复数积分控制能实现交流信号的无静差跟踪,但其动态性能差,准比例谐振控制不仅能实现对交流信号的控制还能保留一定的带宽。故外环采用比例复数积分和准比例谐振控制并联的新型控制策略,内环采用电容电流反馈的有源阻尼方法抑制LLCL逆变器存在的谐振问题。最后基于RT-LAB搭建了半实物仿真实验平台并建立LLCL型并网逆变器模型,通过半实物仿真实验验证了控制策略的可行性。The LLCL(inductance-inductance-capacitance-inductance)type grid-connected inverter can greatly attenuate the current harmonic components at the switching frequency due to the series resonant branch.A double loop control strategy is often directly used to control the grid-connected current in the two-phase stationaryαβcoordinate system.Proportional complex integral control can achieve no static tracking of AC signals,but its dynamic performance is poor.Quasi-proportional resonance control can not only control the AC signal but also retain a certain bandwidth.Therefore,a new control strategy of proportional complex integral and quasi-proportional resonance control in parallel was adopted for the external loop,and the active damping method of capacitive current feedback was used for the inner loop to suppress the resonance problem existing in the LLCL inverter.Finally,a semi-physical simulation experimental platform was built based on RT-LAB,and the LLCL grid-connected inverter model was established.The feasibility of the control strategy was verified through semi-physical simulation experiments.

关 键 词：LLCL型逆变器 串联谐振 比例复数积分 准比例谐振 有源阻尼 RT-LAB 

分 类 号：TM464[电气工程—电器]