We have developed new design methods for generator's excitation controller. The methods can improve damping and synchronizing torque to rise power transfer capability. The power transfer capability is evaluated in a one-machine connected infinite bus system and a multi-machine power system model.
(1) Development of a new optimization method for parameters of AVR and PSS: The method can improve both of damping power and synchronizing power based on eigenvalue sensitivity technique. Applying this method to 18-generator system model, the power transfer capability increases by 7% larger than a conventional method.
(2) Development of a new excitation system with a remote bus voltage as AVR input signal: Increasing of stabilized generator capacity, the power transfer capability expands much higher however its effect is saturated due to bus voltage instability. Introducing a remote signal of the bus voltage into the generator's exciter in addition to a conventional terminal voltage, the power transfer capability grows up to 63%.
(3) Comprehensive controller design scheme for practical use is proposed to enhance both of steady state stability and transient stability.
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