电气传动2017，Vol.47Issue(10)：24-28,5.DOI:10.19457/j.1001-2095.20171005
增强变流器对电网阻抗适应性的陷波前馈控制
Notch Filter Based Grid-voltage Feedforward Control for Enhancing Grid-connected Converter′s Adaptive Capacity to Grid Impedance Variation
摘要
Abstract
The grid-voltage feedforward control is widely used in the grid-connected converter control ,because it can reduce the shock caused by the startup inrush current. However ,the voltage feedforward will cause the reduction of the system′s stability ,and even the instability. The mathematical model of the grid-connected converter in the weak grid was established ,and the robust stability of the converter with the traditional feedforward control in the weak grid was analyzed using the root locus and small gain theory. Owing to the poor robust stability of the traditional full-feedforward control ,the notch filter based feedforward control method was proposed. To realize the gain stabilization ,the notch filter was introduced to tailor the magnitude of the voltage around the cross-over frequency. Therefore ,the converter′s robust stability against the grid impedance variation could be improved. Finally , the prototype of the grid-connected converter was built ,the experimental results confirm the validity of the analysis and the proposed strategy.关键词
并网变流器/弱电网/电网电压前馈控制/鲁棒稳定性/陷波器Key words
grid-connected converter/weak grid/grid-voltage feedforward control/robust stability/notch filter分类
信息技术与安全科学引用本文复制引用
黄现莲,冯向东..增强变流器对电网阻抗适应性的陷波前馈控制[J].电气传动,2017,47(10):24-28,5.基金项目
北方民族大学校级科研一般项目(2017DX010). （2017DX010）
