一种新型分裂电容型LCL滤波器设计方法  

A Novel Design Method of Split-capacitor LCL Filter

作　　者：许晨航 王继承 包立诚 邓焰[1] XU Chen-hang;WANG Ji-cheng;BAO Li-cheng;DENG Yan(Zhejiang University,Hangzhou 310027,China)

机构地区：[1]浙江大学,电气工程学院,浙江杭州310027

出　　处：《电力电子技术》2021年第7期39-45,共7页Power Electronics

摘　　要：此处提出了一种基于并网逆变器下分裂电容型无源阻尼LCL滤波器设计方法。从实现方法来说是一个新的电容与原有的RC支路并联的方法。为研究其工作特性,推导了其传递函数。相较于传统的完全电容方案,分裂电容方案在滤波效果、开关纹波与有功损耗上有明显优势,显著提高了滤波器的效率。为实现这种新拓扑,一种电阻电容设计方法被引入。通过减少并网电流开关纹波和降低阻尼损耗,得到了分配比的可行域。选择合适的分配系数,分裂电容型LCL滤波器能获得相同的阻尼效果,并且降低高频增益。控制上采用准比例谐振(PR)控制器,应用根轨迹整定法确定了基波和5,7次谐波控制参数。通过仿真和实验验证了该设计方法的可行性,并在实际工作环境中测试其效果。The design method of a split-capacitor LCL filter with passive resistor based on grid-connected inverter is proposed here.From the way to realize it,a new capacitor is paralleled with the original RC brunch.In order to research the operating characteristics,its transfer function is inferred.The split-capacitor scheme,compared with the traditional full-capacitor scheme,has distinct advantages in filter effect,switching ripple and active power loss,and it notably improves the efficiency of filter.In order to implement this new topology,a novel design method is introduced,which focuses on the resistance and capacitance distribution ratio.Under the condition of reducing grid current switching ripple and damping loss,the feasible domain is solved out.Selecting suitable distribution coefficients,the split-capacitor LCL filter can obtain the same damping effect,which can also decrease the high-frequency gain.As to control scheme,in order to optimize the control parameters of the quasi-proportion resonant(PR)controller at the fundamental and 5 th,7 th harmonics,the root locus tuning method is applied.The feasibility of the design method is verified by the simulation and experimental results,and its effect is tested in complex environments.

关 键 词：并网逆变器 分裂电容 滤波器 准比例谐振控制器 

分 类 号：TM464[电气工程—电器]