Decentralized Nonlinear Robust Adaptive Excitation Control Design for Power Systems

This paper presents a nonlinear robust adaptive excitation control design procedure for multi machine power systems using back-stepping method. The control objective is to drive machine power angle and frequency to the steady-state operation point, and guarantee that the close-loop system is adaptive to the uncertainties of generator damping coefficient and d-axis reactance, and robust to model errors or bounded disturbances. In the same time, it should guarantee the localized and decentralized features of each controller. The digital simulation results based on a 4-machine power system have showed that the proposed strategy can greatly improve generator angle stability.