adaptive sliding mode control for multi-machine power systems under normal and faulted conditions

This paper proposes a new adaptive sliding mode (asm) decentralized excitation controller to improve the stability of multi-machine power systems under different perturbations such as system’ parametric and structural uncertainties. the stability of the closed-loop system is proved by lyapunov stability theory. the proposed controller is evaluated through simulation on the standard ieee 33-bus-bar power system which contains 6 synchronous machines and a hvdc-link. the simulation results indicate good robustness and satisfactory performance of the proposed controller. moreover, in this paper, using the space-phasor based sequence networks method, a procedure for the dynamic analysis of modern power systems under the transient asymmetrical faults is presented. the method considers the complete dynamics of the synchronous machines and the hvdc-link and provides the possibility of taking into account the sequence networks dynamics.