Considerations in applying optimal power flow to power system operation

Following the recent advancements in optimal power flow (OPF) methods, a number of utilities are either in the process of, or considering, the implementation of an OPF program on their energy management systems. Important considerations which can compromise the effectiveness of OPF and, in some cases, can result in security implications are outlined. A small test system which possesses some of the characteristics of realistic power systems portraying local plant stability, interarea stability, and voltage collapse has been used for demonstration of the arguments. Suggestions are provided to serve as safeguards in assessing and using the present OPF algorithms and as requirements in the future generation of OPF methods