Abstract
This paper presents a novel chattering-free sliding mode control method for a class of disturbed nonlinear systems, which achieves fast and exact disturbance estimation, eliminates chattering, and recovers the performance of nominal system and nominal control input. The proposed approach combines time scale separation design and sliding mode control. Different from the existing disturbance estimation based sliding mode control methods, the proposed scheme achieves fast and exact disturbance estimation through time scale separation and eliminates discontinuous switching term, thereby achieving good chattering alleviation effect and providing good transient response. The proposed control method is applied to suppress chaos in power system and simulation results confirm the effectiveness and robustness of proposed control scheme and highlight the advantages of the proposed control scheme over the existing disturbance estimation based sliding mode control methods in terms of chattering alleviation effect and transient response.
Highlights
IntroductionThe power system is a complex nonlinear dynamical system and when the power system operates near its stability boundary, chaotic oscillation may occur
This paper presents a novel chattering-free sliding mode control method for a class of disturbed nonlinear systems, which achieves fast and exact disturbance estimation, eliminates chattering, and recovers the performance of nominal system and nominal control input
The power system is a complex nonlinear dynamical system and when the power system operates near its stability boundary, chaotic oscillation may occur
Summary
The power system is a complex nonlinear dynamical system and when the power system operates near its stability boundary, chaotic oscillation may occur. Some of them have been applied to suppress chaos in power system Among these control methods, sliding mode control is appealing due to its simple implementation, good transient performance, and robustness against parameter uncertainties and external disturbances. Disturbance estimation based sliding mode control can overcome the drawback of boundary layer method. Instead of employing high gain disturbance observer, the proposed control strategy achieves fast and exact disturbance estimation through time scale separation. The proposed control scheme is applied to suppress chaos in power system, recover the nominal system performance, and eliminate the influence of load disturbance. In comparison with existing results of disturbance estimation based sliding mode control, the main features of proposed control scheme can be summarized as follows:.
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