Novel adaptive control scheme for improving power system stability

The author presents a new adaptive control approach for power systems. The proposed adaptive control structure is based on hyperstability theory. The control is constructed so that the closed-loop system is hyperstable, guaranteeing the dynamic stability improvement of power systems. The changeable gains generated by a nonlinear function act as the adaptive mechanism. Compared with MRAC or STAC, the proposed control structure avoids the difficulty of choosing an appropriate reference model and the burden of implementing an online parameter estimator. Simulation results of a numerical example are presented, which show that the controller works well under system parameter changes, variation in operating conditions and with different disturbances