Disturbance Observer Based Pitch Control of Wind Turbines for Enhanced Speed Regulation. Yuan, Y., Chen, X., & Tang, J. ASME Journal of Dynamic Systems, Measurement, and Control, 139(7):071006, May, 2017.
doi  abstract   bibtex   
Time-varying unknown wind disturbances significantly influence the dynamics of the wind turbines. In this paper, a disturbance observer based (DOB) control scheme is illustrated to reject disturbances to the wind turbines at above-rated wind speeds. Specifically, we aim at maintaining a constant output power and achieving better generator speed regulation when the wind turbine is operated at time-varying and turbulent wind fields. The inner DOB scheme is augmented with a collective gain-scheduling proportional integral (PI) feedback controller to asymptotically reject the persistent unknown time-varying disturbances. The proposed algorithm is applied to both linearized and nonlinear National Renewable Energy Laboratory (NREL) offshore 5-MW baseline wind turbines. Also an extra compensator to deal with the mismatch between the linearized reduced-order model and the actual nonlinear wind turbine is discussed. The novel application of the augmented DOB pitch controller demonstrates improved power and speed regulation in the above-rated region both for linearized and nonlinear plants.
@article{Yuan_DOB2016,
	Abstract = {Time-varying unknown wind disturbances significantly influence the dynamics of the wind turbines. In this paper, a disturbance observer based (DOB) control scheme is illustrated to reject disturbances to the wind turbines at above-rated wind speeds. Specifically, we aim at maintaining a constant output power and achieving better generator speed regulation when the wind turbine is operated at time-varying and turbulent wind fields. The inner DOB scheme is augmented with a collective gain-scheduling proportional integral (PI) feedback controller to asymptotically reject the persistent unknown time-varying disturbances. The proposed algorithm is applied to both linearized and nonlinear National Renewable Energy Laboratory (NREL) offshore 5-MW baseline wind turbines. Also an extra compensator to deal with the mismatch between the linearized reduced-order model and the actual nonlinear wind turbine is discussed. The novel application of the augmented DOB pitch controller demonstrates improved power and speed regulation in the above-rated region both for linearized and nonlinear plants.},
	Author = {Yuan Yuan and Xu Chen and Jiong Tang},
	Date-Modified = {2018-04-15 03:18:25 +0000},
	Doi = {10.1115/1.4035741},
	Journal = {ASME Journal of Dynamic Systems, Measurement, and Control},
	Month = {May},
	Number = {7},
	Pages = {071006},
	Title = {Disturbance Observer Based Pitch Control of Wind Turbines for Enhanced Speed Regulation},
	Volume = {139},
	Year = {2017},
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