Observer based robust integral sliding mode load frequency control for wind power systems. (August 2017)

• Record Type: Journal Article
• Authors: Cui, Yanliang; Xu, Lanlan; Fei, Minrui; Shen, Yubin
• Is Part Of: Control engineering practice. Volume 65(2017)
• Page Start: 1
• Page End: 10
• Publication Date: 2017-08
• Subjects: Integral sliding mode -- Load frequency control -- Wind power systems -- Polytopic uncertainties -- Power changes; Automatic control -- Periodicals; 629.89
• DOI: 10.1016/j.conengprac.2017.05.001
• Languages: English
• ISSNs: 0967-0661

Abstract

Abstract: This paper investigates the load frequency control (LFC) for wind power systems with modeling uncertainties and variant loads. Since the system state is difficult to be accurately measured due to perturbation of nonlinear load, an observer is designed for reconstructing a substitution system state. Afterwards, an integral sliding surface is designed and a sliding mode LFC (SMLFC) strategy is proposed for reducing frequency deviations of the overall power system. Remarkably, it has been pointed out that a larger convergence rate of the observer error system has positive influences on the SMLFC performances, while the larger observer gain deteriorates the dynamic behavior. For seeking an acceptable balance so as to determine the optimal controller parameters, a collaborative design algorithm is proposed. The proposed method not only guarantees the asymptotical stability of overall power systems but also capable of improving the system robustness. Numerical examples are provided to demonstrate the effectiveness of the proposed methods.