7. Phase Shift Correction

In the context of network planning, equipment and load dynamics are of course the driving force behind phase shift voltage instability. In this chapter, for the 2-bus systems in a connected power system, we show that the voltage of all relevant buses (i.e., both bus-1 and bus-2) varies in the same way as the transmitted power. In the sequel, we examine the state-space formulation pertaining to voltage regulation and phase-shift correction. In the state-space formulation, some assumptions are made, i.e., shunt admittance has been neglected, there is no reactive support on the load bus, and the generator terminal voltage phasor is assumed to coincide with the rotor position, the load being defined by the real and reactive power demand. We anticipate further that the incorporation of shunt admittance, reactive support on the load bus, and the generator terminal voltage phasor will involve a sub-dominant correction.