Open AccessNon‐linear tip speed ratio cascade control for variable speed high power wind turbines: a backstepping approach
Author(s) -
Wang Liangyong,
Cao Linxi,
Zhao Lei
Publication year - 2018
Publication title -
iet renewable power generation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.005
H-Index - 76
eISSN - 1752-1424
pISSN - 1752-1416
DOI - 10.1049/iet-rpg.2017.0698
Subject(s) - control theory (sociology) , cascade , backstepping , controller (irrigation) , inner loop , tip speed ratio , rotor (electric) , wind power , electronic speed control , inertia , torque , computer science , control engineering , engineering , control (management) , physics , adaptive control , mechanical engineering , agronomy , electrical engineering , classical mechanics , chemical engineering , artificial intelligence , biology , thermodynamics
This study presents a non‐linear tip speed ratio (TSR) cascade controller for high power wind turbines (WTs) considering the effects of the large rotor inertia and torsional behaviour of the shafts. A model‐based non‐linear rotor speed controller is proposed for the inner loop. The required speed reference is provided by an outer loop. A design procedure for cascade control of WTs is based on a backstepping design. It is shown that the above two‐loop control schemes lead to a nice cascade structure for the closed‐loop systems. Stability result adapted for analysis of this particular kind of systems is developed. The effectiveness of the proposed control approach is evaluated on a WT by comparing with typical control strategies such as non‐linear TSR control, optimal torque control, and sliding mode control. Simulation results show that the proposed two‐loop controller exhibits better performance than the above typical control strategies.