Predictive Generator Control for Improvement of Power Distribution System Stability

The stability of large-scale power systems has been well studied in the past three decades. However, the stability of power distribution systems in the presence of privately own generation virtually has not been studied. Power distribution system stability concerns increase rapidly as the demand for open access to the electric power systems for generation and trading under new government deregulation policies grows. This paper describes an adaptive control of generator excitation system, based on step-ahead predictive control method for improvement of the dynamic stability of power distribution systems, particularly the weakly inter-connected ones. This predictive control is based on the minimization of a performance index which is defined as a weighted combination of four key factors: deviation of generator terminal voltage from its reference voltage; difference of mechanical and electrical torques; increment of rotor speed; and increment of rotor flux linkage