Development of Novel Robust Regulator for Maximum Wind Energy Extraction Based upon Perturbation and Observation

Bo Li, Wenhu Tang, Kaishun Xiahou and Qinghua Wu
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Bo Li: School of Electric Power Engineering, South China University of Technology, Guangzhou 510640, China
Wenhu Tang: School of Electric Power Engineering, South China University of Technology, Guangzhou 510640, China
Kaishun Xiahou: School of Electric Power Engineering, South China University of Technology, Guangzhou 510640, China
Qinghua Wu: School of Electric Power Engineering, South China University of Technology, Guangzhou 510640, China

Energies, 2017, vol. 10, issue 4, 1-21

Abstract: This paper develops a robust regulator design approach to maximum power point tracking (MPPT) of a variable-speed wind energy conversion system (WECS) under the concept of perturbation and observation. The proposed perturb and observe regulators (PORs) rooted on the sliding mode method employs the optimal power curve (OPC) to realize MPPT operations by continuously adjusting rotor speeds and the duty cycles, which can ensure control performance against system parameter variations. The proposed PORs can detect sudden wind speed changes indirectly through the mechanical power coefficient, which is used to acquire the rotor speed reference by comparing it with the optimal power constant. For the speed and duty cycle regulation, two novel controllers based on the proposed POR, i.e., an MPPT controller and a speed controller, are devised in this research. Moreover, by applying the small-signal analysis on a nonlinear wind turbine system, the convergence of the proposed speed controller is proven for the first time based on the Lyapunov theory, and meanwhile, a single-pole transfer function, to describe the effect of duty cycle variations on rotor speeds, is designed to ensure its stability. The proposed strategy is verified by simulation cases operated in MATLAB/Simulink and experimental results performed from a 0.5-kW wind turbine generator simulator.

Keywords: perturb and observe regulator (POR); wind energy conversion system (WECS); sliding mode control; maximum power point tracking (MPPT) (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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