摘要
目的解决大功率三相光伏并网逆变器在不平衡跌落时网侧电流所产生的畸变及不平衡,保证在电网不平衡下电压的正、负序分量提取的准确性和实时性。方法采用前馈解耦的空间矢量的双闭环控制算法抑制负序电流的控制策略搭建仿真模型。结果提出了基于正、负序d-q坐标系下的二次陷波器滤波法正确提取电网电压的方法。结论实验结果证明,该方法能有效地对正、负序进行分解以及抑制电网不平衡跌落导致的系统的不稳定运行。
Purposes—To solve the generated distortion and imbalance of line current when highpower three-phase photovoltaic inverter is in the unbalanced dips,and to ensure the accuracy and realtime of the positive and negative sequence component extraction.Methods—The simulation model is built by using the dual closed-loop control algorithm of feedforward decoupling space vector is used to suppress the negative sequence current.Results—A notch filtering method is proposed based on quadratic positive and negative sequence d-qcoordinate system to extract the correct grid voltage.Conclusions—Experimental results show that this method can effectively decompose the positive and negative sequences and suppress the unstable system operation caused by unbalanced dips of grid.
出处
《宝鸡文理学院学报（自然科学版）》
CAS
2017年第1期59-62,71,共5页
Journal of Baoji University of Arts and Sciences(Natural Science Edition)
基金
安徽新华学院校级科研项目(2014zr007)
安徽新华学院校级重点教研项目(2016jy007)
关键词
低电压穿越
不平衡控制
陷波器
low voltage ride-through
unbalanced control
trap
