A new approach to reduce the non-linear characteristics of a stressed power system by using the normal form technique in the control design of the excitation system A new approach to reduce the non-linear characteristics of a stressed power system by using the normal form technique in the control design of the excitation system," in Industry Applications Society Annual Meeting, 2015 IEEE, 2015 A new approach to reduce the non-linear characteristics of a stressed power system by using the normal form technique in the control design of the excitation system AbstractIn this paper, a new approach is presented to reduce the nonlinear characteristics of a stressed power system by reducing its second-order modal interaction through retuning some parameters of the generator excitation system. In order to determine the second-order modal interaction of the system, a new index on nonlinearity is developed using normal form theory. Using the proposed index of nonlinearity, a sensitivity function is formed to indicate the most effective excitation system parameters in the nonlinear behavior of the system. These dominant parameters are tuned to reduce the second-order modal interaction of the system and to reduce the index on nonlinearity. The efficiency of the proposed method is validated using a four-machine two-area test system. Simulation results show that a proper tuning of the excitation controller can reduce the second-order modal interaction of the system and can even improve the transient stability margin of the network. This conference paper is available at Research Online: http://ro.uow.edu.au/eispapers/5608 Abstract--In this paper, a new approach is presented to reduce the nonlinear characteristics of a stressed power system by reducing its second-order modal interaction through retuning some parameters of the generator excitation system. In order to determine the second-order modal interaction of the system, a new index on nonlinearity is developed using normal form theory. Using the proposed index of nonlinearity, a sensitivity function is formed to indicate the most effective excitation system parameters in the nonlinear behavior of the system. These dominant parameters are tuned to reduce the second-order modal interaction of the system and to reduce the index on nonlinearity. The efficiency of the proposed method is validated using a four-machine two-area test system. Simulation results show that a proper tuning of the excitation controller can reduce the second-order modal interaction of the system and can even improve the transient stability margin of the network.Index Terms-index of nonlinearity; modal interaction; nonlinear systems; normal form; transient stability.

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A new approach to reduce the non-linear characteristics of a stressed power system by using the normal form technique in the control design of the excitation system A new approach to reduce the non-linear characteristics of a stressed power system by using the normal form technique in the control design of the excitation system," in Industry Applications Society Annual Meeting, 2015 IEEE, 2015 A new approach to reduce the non-linear characteristics of a stressed power system by using the normal form technique in the control design of the excitation system AbstractIn this paper, a new approach is presented to reduce the nonlinear characteristics of a stressed power system by reducing its second-order modal interaction through retuning some parameters of the generator excitation system. In order to determine the second-order modal interaction of the system, a new index on nonlinearity is developed using normal form theory. Using the proposed index of nonlinearity, a sensitivity function is formed to indicate the most effective excitation system parameters in the nonlinear behavior of the system. These dominant parameters are tuned to reduce the second-order modal interaction of the system and to reduce the index on nonlinearity. The efficiency of the proposed method is validated using a four-machine two-area test system. Simulation results show that a proper tuning of the excitation controller can reduce the second-order modal interaction of the system and can even improve the transient stability margin of the network. This conference paper is available at Research Online: http://ro.uow.edu.au/eispapers/5608 Abstract--In this paper, a new approach is presented to reduce the nonlinear characteristics of a stressed power system by reducing its second-order modal interaction through retuning some parameters of the generator excitation system. In order to determine the second-order modal interaction of the system, a new index on nonlinearity is developed using normal form theory. Using the proposed index of nonlinearity, a sensitivity function is formed to indicate the most effective excitation system parameters in the nonlinear behavior of the system. These dominant parameters are tuned to reduce the second-order modal interaction of the system and to reduce the index on nonlinearity. The efficiency of the proposed method is validated using a four-machine two-area test system. Simulation results show that a proper tuning of the excitation controller can reduce the second-order modal interaction of the system and can even improve the transient stability margin of the network.Index Terms-index of nonlinearity; modal interaction; nonlinear systems; normal form; transient stability.