SECURITY MONITORING SYSTEM AND METHOD FOR AN ELECTRIC POWER SYSTEM EMPLOYING A FAST ON-LINE LOADFLOW COMPUTER ARRANGEMENT

摘要

A security monitoring system for an electric power system includes a data acquisition system and a hybrid loadflow computer arrangement. The hybrid loadflow computer in turn includes an analog network simulator and a digital computer which processes and operates upon acquired on-line data and operator data related to the power system loadflow problem. The analog simulator includes modular circuits representative of power system busses and lines and the interface between the digital computer and the analog network simulator is provided by analog-to-digital and digital-to-analog converters and by line outage contact closure outputs. The hybrid arrangement operates iteratively to provide loadflow solutions, with the analog network simulator providing a bus voltage solution for a set of network simultaneous equations and the digital computer providing bus load and generation injection current calculations and convergence steering control. Because loadflow solutions are generated cyclically and contingency case loadflow solutions are generated with the use of basecase data modified to reflect the contingencies. Modifications are also made in the analog simulator to reflect the contingencies.