Authors: Changliang Xia, Huimin Wang, Zhanfeng Song
Addresses: School of Electrical Engineering and Automation, Tianjin University, Tianjin, 300072, China. ' School of Electrical Engineering and Automation, Tianjin University, Tianjin, 300072, China. ' School of Electrical Engineering and Automation, Tianjin University, Tianjin, 300072, China
Abstract: Based on the grid voltage orientated vector control technique, a novel integral variable structure controller for current control of variable speed doubly fed induction generator (DFIG) wind turbines near cut-in wind speed is proposed. The proposed current controller can not only ensure generators| safe cut-in switches to the grid, but also maximum energy capture after switch motion without any regulations. By these, simulations of a 1.5 MW DFIG-based wind turbine near cut-in wind speed are separately conducted under integral variable structure control (IVSC) and PI control. The results show that IVSC strategy, which gives better dynamic response, less static error, smaller controller output dithering, stronger global robustness against generator parameters uncertainty and the grid voltage fluctuation, as well as needless controller regulation after cutting-in the grid, obviously preponderates over traditional PI control for DFIG-based wind turbines near cut-in speed.
Keywords: doubly fed induction generators; DIFG; wind turbines; no-load cut-in control; maximum energy capture; grid voltage orientate; integral variable structure control; IVSC; wind energy; wind power.
International Journal of Modelling, Identification and Control, 2009 Vol.7 No.4, pp.338 - 345
Published online: 14 Aug 2009 *Full-text access for editors Access for subscribers Purchase this article Comment on this article