AVAILABLE TRANSFER CAPABILITY COMPUTATION SCHEME USING LVS-INDEX MODEL

A simplified computation scheme for available transfer capability (ATC) that incorporates an improved management scheme for power transfer is presented. The scheme selects appropriate line voltage stability (LVS) index model to compute the proximity to collapse of a chosen transmission line using successive incremental loading of the line. The ATC is then computed as the amount of additional line loading before the stability index reaches its pre-fixed limit. The improved management comes with the incorporation of a series compensator at the determined weak lines to improve their extra power wheeling capability. This entails applying the LVS index model to multiseries FACTS-incorporated Newton-Raphson’s (N-R) power flow model to monitor and regulate its performance. The results obtained when this scheme was simulated with the IEEE 300 bus system with zoning and under varying operating conditions, showed the system’s capability to provide simplified and reliable system ATC computation thereby enabling the proper monitoring of the series compensated transmission lines’ operating status.