Internet based wide area information sharing and its roles in power system state estimation

The Internet can play an important role in wide area information sharing (WAIS) especially in the noncritical time applications. Moving from independent system operators (ISOs) to regional transmission organizations (RTOs) is one example of the need for WAIS. The WAIS system can form the basis for the future RTO communication model or as a national level security coordinator communication model, if such a need should arise in the near future. This paper discusses some of our study results of the effect of wide area measurements on the power system calculations. Most of the calculations for power system operation are primarily based on accurate determination of the state (the voltage and the angle at each bus) of the power system. A comparison study between integrated state estimation (ISE), which is based on sharing real time measurements, and split state estimation (SSE), that is based on sharing SE outputs is presented. The factors which affect the accuracy of SSE are also presented.