Decentralized high order sliding mode control of multimachine power systems

In this paper, feedback linearization approach and high order sliding mode control are combined to stabilize and decentralize nonlinear multimachine power systems. The design control permits to decentralize and handle the nonlinearities of power systems model by using the feedback linearization approach and HOSM control to each generating unit in the global system for stabilizing the system. Each machine is modeled as an independent uncertain dynamic subsystem where the uncertainty is a disturbance that represents the effects of the rest of the system on that particular machine. This disturbance is estimated by numerical method. A local high order sliding mode stabilizer is designed to regulate the machine angle of each generating unit under high level external disturbances. This method is illustrated with a three-machines infinite bus power system. Simulations show that the proposed (DHOSMC) provides high-performance in dynamic characteristics and its robustness with regard to external disturbance. (C) 2012 Elsevier Ltd. All rights reserved.