电网技术2017，Vol.41Issue(1)：115-120,6.DOI:10.13335/j.1000-3673.pst.2016.0289
弱电网下光伏并网逆变器自适应准PRD控制方法
Adaptive Quasi-PRD Control Method of Grid-Connected PV Inverter in Weak Grid
刘桂花 1石桐 1马田源 1王卫1
作者信息
- 1. 哈尔滨工业大学电气工程及其自动化学院，黑龙江省哈尔滨市 150001
- 折叠
摘要
Abstract
When grid-connected photovoltaic (PV) inverter is connected to weak grid, high equivalent impedance of weak grid can lead to small bandwidth of control system and poor control performance. Aiming at this problem, this paper proposes an adaptive quasi proportion resonant differential (quasi-PRD) control method. This method firstly uses quasi-PRD controller to replace traditional PI controller to realize zero steady-state error tracking and expand system bandwidth. Then, double harmonic current injection method is applied to implement on-line detection of grid impedance. Finally, the detected impedance value is used to on-line adjust controller parameters of quasi-PRD. Simulations and experiments were performed, verifying that the proposed method can not only increase bandwidth and dynamic response speed of control system, but also improve system adaptability for different grid impedance values, and eventually improve power quality.关键词
弱电网/准PRD控制/电网阻抗/自适应控制Key words
weak grid/quasi-PRD control/grid impedance/adaptive control分类
信息技术与安全科学引用本文复制引用
刘桂花,石桐,马田源,王卫..弱电网下光伏并网逆变器自适应准PRD控制方法[J].电网技术,2017,41(1):115-120,6.
