Enhancing Small Signal Stability in Multi-Machine System Using a New Excitation Controller

Changing the reference signal of the excitation and Automatic Voltage Regulator (AVR) systems is one of the excitation control methods in controlling the terminal voltage of the generator and reactive power. In most cases the aforementioned method results in transient oscillations in the output voltage of the generator that must be damped as quickly as possible A four-machine system is considered to study the damping capability of the proposed controller when sudden disturbances influence the excitation system. Extensive time domain simulations and a performance index are used to validate the performance of the proposed controller. It is shown that using the POSICAST controller increases the overall performance of the system in damping the oscillations.

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