电气传动2018，Vol.48Issue(4)：17-21,5.DOI:10.19457/j.1001-2095.20180404
增强LCL逆变器对弱电网适应能力的前馈控制
Feedforward Control for Improving LCL Inverter′s Adaptability to Weak Grid
尹有为 1井敬 1杨树德 1王戈 1杨志强1
作者信息
- 1. 西安理工大学自动化与信息工程学院,陕西 西安710048
- 折叠
摘要
Abstract
Inductive grid impedance in weak grid will reduce the stability of the grid-connected inverter,that will be aggravated by grid-voltage feedforward control. The model of LCL grid-connected inverter in the weak grid was established. Then,based on the open-loop transfer function of the system,the influence of grid impedance on the stability margin of the system was analyzed in detail when the feedforward was adopted. Owing to the low robust stability of the system with traditional grid voltage feedforward,a notch feedforward control strategy based on second order generalized integrator(SOGI)was proposed,and the principle for selecting the bandwidth of the notch was also given.The simulation results show that the feedforward control strategy can greatly improve the adaptability of grid-connected inverter to grid impedance.关键词
弱电网/LCL并网逆变器/前馈控制/二阶广义积分器Key words
weak grid/LCL grid-connected inverter/feedforward control/second order generalized integrator (SOGI)分类
信息技术与安全科学引用本文复制引用
尹有为,井敬,杨树德,王戈,杨志强..增强LCL逆变器对弱电网适应能力的前馈控制[J].电气传动,2018,48(4):17-21,5.
