Power system restructuring brings about new challenges to power system stability, especially the transient stability (TS) and small-signal stability (SS) of interconnected large-scale power systems under large and cascaded disturbances. This is because of the need to yield more economic benefits in deregulated environments. In order to improve interconnected power system TS and SS in deregulated environments, the development of an effective global control frame is very important. In this paper a preliminary study on the issue is presented. First, nonlinear robust adaptive control (RAC) is applied to excitation system utilizing local measurements. Then, RAC for the supplementary control of HVDC transmission and FACTS device (e.g. TCSC) using the WAMS signal of system center of inertia (COI) dynamics is presented. The computer test results are shown to be very positive. Based on the results, an overall control frame is suggested for enhancing TS and SS of interconnected power systems. Future work in realizing the new control frame is also discussed.Index Terms --HVDC transmission, FACTS, power system, transient stability, nonlinear robust adaptive control.
decent response to ensure stability. In order to solve these Abstract-A nonlinear robust adaptive controller for dc power problems, there has been a great deal of research in the modulation of interconnected ac/dc power systems is proposed application of nonlinear control theories in power system and is used to damp tie line power oscillations in interconnected control, and the most established ones include applications of power systems. The design idea is to drive the centers of inertia robust control theory and differential geometric theories. In the (COI) of various interconnected areas to a stable equilibrium application of differential geometric theory, nonlinear systems point such that the oscillations in the system can be damped out.. . 'Genetic algorithm is applied to optimize the parameters of the ar transf ormedinlearpones such that various existing proposed controller, and computer test results illustrate that the linear control theories can be applied [3]- [5]. The drawbacks of proposed controller is superior to the conventional linear dc such an approach are that exact knowledge of the mathematical power modulation controller.. model of the studied system is required, and uncertainties such Index Terms-Center of Inertia, Genetic Algorithm, HVDC as model errors and disturbances are neglected. Robust control transmission, Nonlinear robust adaptive control, Power system. theories have been proposed to solve such problems and to enhance the robustness of control methods in power systems
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