Distributed Control of Networked Wide-Area Systems: A Power System Application

Abstract

Newly, the advent of geographically distributed systems is lead to using communication networks for connecting the control system components to each other, which typically known as Networked Control Systems (NCSs). However, communication network-induced imperfections such as transmission delay and packet dropout will severely affect the wide area control system performance or even cause the instability of the system. Accordingly, this work proposes an efficient distributed networked-based sliding mode control framework for control of wide area systems inclusive of both random delay and random data packet dropout in their communication network connections where, the local sliding mode controllers are designed based on Linear Matrix Inequality (LMI) approach. The Lyapunov stability theory is used to derive efficient LMI-based delay-independent adequate conditions to design the asymptotic stable sliding surfaces for each interconnected subsystem, as well as the stabilizing of entire system. To verify the effectiveness and capability of the suggested method some simulation studies are provided over two power systems for better load frequency performance. Simulation results show performance improvement of the distributed networked wide area system despite of the existence of non-ideal communication network.