Open AccessSecond‐order sliding‐mode‐based global control scheme for wind turbine‐driven DFIGs subject to unbalanced and distorted grid voltage
Author(s) -
Martinez Miren Itsaso,
Susperregui Ana,
Tapia Gerardo
Publication year - 2017
Publication title -
iet electric power applications
Language(s) - English
Resource type - Journals
ISSN - 1751-8679
DOI - 10.1049/iet-epa.2016.0711
Subject(s) - control theory (sociology) , induction generator , converters , wind power , robustness (evolution) , turbine , voltage , grid , engineering , ac power , computer science , mathematics , electrical engineering , control (management) , geometry , artificial intelligence , mechanical engineering , biochemistry , chemistry , gene
Control algorithms for both the rotor‐ and grid‐side power converters of a wind turbine‐driven doubly‐fed induction generator (DFIG) are detailed, and tuning equations are also provided to assist adjustment of their gains and constants. Those algorithms are based on the second‐order sliding‐mode control (2‐SMC) approach, and they allow the wind turbine to satisfactorily operate under grid voltage non‐idealities, such as simultaneously distorted and unbalanced scenarios. The presented solution turns out to be robust against parameter deviations and disturbances, and of high‐performance dynamic response. Moreover, it drives the transistors of both power converters at a constant switching frequency, also avoiding decomposition in symmetrical sequences of either the grid voltage or currents. The controllers proposed for the two power converters are validated through experimentation on a 7‐kW DFIG test bench subject to a significantly unbalanced and harmonically distorted grid voltage. Their robustness in the presence of both substantial parameter mismatch and disturbances attributable to wind variability is also assessed.