Redundant Channels-Based SMC for Tidal Stream Turbine System: Handling Signal Transmission Packet Dropouts

Abstract

A novel redundant channels-based sliding mode control (SMC) strategy is proposed to overcome the adverse effects of packet dropouts during signal transmission of tidal stream turbine system. To deal with the random characteristics of water velocity, the tidal stream turbine model is modeled as semi-Markov jump system. Due to the change of environmental factors, the actual state information of tidal turbine system is usually difficult or impossible to obtain, and the output feedback method is adopted to estimate the state information. The novelty is that the output feedback method is adopted to design the sliding surface, combining with the redundant channels method to obtain the redundant channels-based SMC mechanism, which overcomes the influence of uncertain parameters and packet dropouts during the signal transmission. Based on the elapsed-time-dependent Lyapunov function and SMK framework, the $\sigma $ -error mean-square stability is realized. Furthermore, a suitable SMC method is constructed to realize the quasi-sliding mode. A simulation example is given to verify the effectiveness of the design method.