The Adaptive Power System Stabilizing (APSS) has been developed. This system evaluates the transient responses for each ground fault point and the operating point of the power system by bus-to-bus phase, to obtain an optimal set of tuning parameters for APSS. When the operation point changes with a great amount, the tuning parameters will be readjusted by on-line operation. Simulation of the 16-machine 48-bus system is carried out to prove the validity of the proposed method.
