SUMMARYWith the advent of interconnection of large-scale electric power systems, many new dynamics power system problems have emerged, which include low-frequency intersystem oscillations and many others. To date, most major generators in trunk electric power systems in Japan are equipped with supplementary excitation control, commonly referred to as the conventional single and two input PSS. However, low-frequency oscillations still occur. It is difficult for these conventional PSS to improve the additional damping of power system oscillation, because of the hardware and design of fixed PSS control constants from a one-machine infinite-bus model. It has therefore become necessary to develop a new adaptive LQG system generator. This paper explains the development of the new adaptive LQG system and the simulation of low-frequency and local mode oscillation for this new adaptive LQG system.

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