Voltage problems on transmission networks subject to unusual power flow patterns

Conditions for the existence of a physically acceptable voltage solution in power transmission networks are given, and a sensitivity-based approach for their real-time evaluation is outlined. Theoretical results are illustrated on a simplified Pennsylvania-New Jersey-Maryland model, on which reactive power/voltage problems were reported to exist. On the same system a comparison of the most typical voltage controls is made. Different corrective control actions are compared in the context of their role within a multiple-utility power wheeling operating mode. The study represents an overall attempt to link existing operating voltage problems (frequently economics driven) to the theoretical results necessary for their fundamental understanding and for designing efficient real time system monitoring and control techniques