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The model used for real-time network security and transmission capability analyses requires the use of a large area network and has to be brought up to 'real-time' conditions. To build a complete network model, supervisory control and data acquisition (SCADA) data have to be made available to many external bodies. In this paper, an Internet interface to SCADA systems is proposed for inter control center data exchange. A discrete event technique is utilized to simulate the interarea data exchange. The performance modeling of data exchange on the Internet is established, and a quantitative analysis of the data exchange delay is presented. Simulation and experimental results have indicated that the Internet provides a convenient way for intercontrol center data exchange and, by using state estimation (SE) accurate complete network models, can be obtained for practical security and available transfer capability analyses. Index Terms--Communication network simulation, complete network model, intercontrol center data exchange, security analysis.

The ability of a regression tree method to properly interpolate among recorded data to give an estimate of the frequency decline following a generator outage is examined in this letter. The proposed method is a nonparametric technique that can select those system characteristics and their interactions that are most important in determining the relation between the generation/load imbalance and the frequency decline. The information obtained from the proposed method can be used online for scheduling fast-acting reserve or load shedding for severe generator outage incidents. Index Terms--Frequency control, generation/load imbalance, load shedding, regression tree, spinning reserve.