摘要
现有的LCL滤波器设计方法未能有效兼顾逆变器电流控制对滤波器设计的限制以及电网阻抗对并网稳定性的约束。文章通过建立含数字延迟的弱电网下LCL滤波并网逆变器模型,得到控制性能及并网稳定性对参数设计的约束条件,建立以损耗最小、成本最低、提高对电网阻抗适应能力、提升电流跟踪性能为子目标的多目标优化模型,并采用目标函数离差排序法确定权重系数,自适应权重PSO求解。该设计方案在保证滤波性能和制造成本的同时,增强了LCL并网逆变器在弱电网下的稳定裕度。最后,通过仿真分析验证了该设计方案的正确性与有效性。
The existing LCL-filter design method fails to effectively balance the limitations of the inverter current control on the filter design and the grid impedance to the grid stability.In this paper,the control performance and grid-connected stability constraints on parameter design are obtained by establishing a LCL-filtered grid-connected inverter model with weak grid as well as digital control delay.And then,the multi-objective optimization model is set up with the minimum loss,the lowest cost,the best impedance adaptability to the grid and the best current tracking performance.The objective function sort deviation is used to determine the weight coefficient and the adaptive weight PSO algorithm is used to solve the optimization problem.This scheme enhances the stability margin of the LCL-filtered grid-connected inverter under weak grid while ensuring the filtering performance and manufacturing cost.Finally,the rationality and feasibility of the design scheme are verified by simulation analysis.
作者
岳惠
杨洪耕
Yue Hui;Yang Honggeng(School of Electrical Engineering,Sichuan University,Chengdu 610065,China)
出处
《电测与仪表》
北大核心
2019年第23期132-138,145,共8页
Electrical Measurement & Instrumentation
基金
国家自然科学基金资助项目(51477105)
高比例直流馈入城市电网谐波传导特征和抑制措施研究(52094018001B)
