Contributions of enhanced generator excitation control to power system stability

The paper investigates the capability of enhanced generator excitation control for extending the limits of power system stability and operation. A simple power system model is considered, which has two distinct oscillatory modes that are of frequencies relevant to the realistic power system. Dynamic performance is assessed through eigenvalue analysis and in terms of time response analysis for both small and large disturbances. The enhanced form of control is provided by a generator transfer function regulator (GTFR) based scheme, and its performance is compared with that of an existing conventional scheme. It is shown that the GTFR based scheme exhibits superior control performance, particularly as limiting conditions are approached, and extends the range of stable operation.