Observer-Based Sliding Mode Control for Interconnected Systems Under Constrained Bit Rate: Weighted Try-Once-Discard Scheme

This paper investigates the observer-based sliding mode control (SMC) problem for interconnected systems under the constrained bit rate and weighted try-once-discard (WTOD) protocol. The bandwidth of the digital communication network is measured by the bit rate. With limited network bandwidth, a WTOD protocol is introduced to reduce the length of the transmitted sensor data to reduce the bit rate consumption and improve the decoded accuracy. The selected data components under the WTOD protocol are compressed and transmitted to the observer side by the designed encoding-decoding mechanism. Then, an observer-based SMC strategy is developed under a decoded output-based observer and a normal sliding surface. Some sufficient conditions are provided to ensure that the closed-loop system is exponentially ultimately bounded (EUB) while the system trajectories can be driven into a specific sliding domain. Finally, a two-area power system is exploited to validate the effectiveness of the developed control algorithm.