Adequacy equivalent development of composite generation and transmission systems

This paper presents a technique for the development of adequacy equivalents for composite generation and transmission systems using a d.c. load flow a pproach. Adequacy equivalent concepts can be very useful in large composite power system adequacy evaluation where extremely long computation times ar e usually required. The computation time burden can be effectively alleviat ed by using a reduced equivalent model to represent the unchanging portion of a composite system. These reduced models, designated as reliability or a dequacy equivalents, retain the essential elements in their desired form bu t eliminate much of the system detail. Network flow methods are usually use d to develop adequacy equivalents for composite systems. The d.c. load flow technique, however, is a more widely accepted procedure for composite syst em analyses as it can provide more accurate solutions than a network flow m ethod. The concepts associated with developing adequacy equivalents using a d.c. load flow method are illustrated using simple power networks. Results and analyses of system studies based on two test systems are presented in the paper. (C) 2001 Elsevier Science Ltd. All rights reserved.