SPEED CONTROL AND SYNCHRONIZING OF ALTERNATORS USING PHASE LOCKED LOOPS

Abstract

In the present work, an integrated and fully auto-matic speed control scheme, has been conceived and imple-mented, based on the concepts of both frequency and phase locking. Perhaps for the first time, an attempt has been made to develop, a fully automated Synchronizer for power station applications utilizing the techniques of both frequency and phase locking. In the area of implementation new types of hii precision frequency difference and phase difference detectors have been deve-. loped and fully tested. The incorporation of dual locked loops in the control scheme is primarily dictated, from considerations of improving significantly the system stability, Endowed with orders of accurrcy within .002 percent and considerably improved levels of repeatability and staoility, the developed control scheme promises to be extremely versatile with applications ranging from high precision regulation of large capacity motors to automated Synchronizing of multi motor systems in addition to thatof fully automated alternator Synchronizers. A unit feature of the dissertation is the development of an experimental version of the PLDS for research investigations and educational purposes.