Power Control and Stability of Electric Generating Stations

Charles P. Steinmetz
1920 Transactions of the American Institute of Electrical Engineers  
Chief Consulting Engineer, General Electric Co. ITH the increasing use of electrie power, the size of electric generating systems has steadily increased, from the small electric lighting stations of the early days, with two or three, 30-or 60-kw. high-frequency alternators, to the huge metropolitan systems, with several hundred thousand kilowatts of steam turbine alternators. The problem of close inherent regulation of the generators, that is, of constancy of voltage under sudden changes of
more » ... dden changes of load, has ceased, since no possible sudden change of load-short of short circuit-is sufficient to appreciably affect the voltage of these big systems. The reverse problem however has become serious, that of limiting the power which can accidentally be concentrated at any point of the system, and its destructiveness. With the increasing size and extent of systems, they were divided into a number of generating stations, more economically to cover the territory, as under present conditions there seemed to be no material gain in going much over 100,000 kw. in one station. Thus usually two to four or more main generating stations are used, and a number of smaller secondary generating stations to stabilize the power at the end of long feeders, in outlying centers of distribution, etc. Economy and reliability of operation demands parallel operation of the entire system, and synchronous operation of all the generating stations is thus the universal custom. In the former 250-volt direct-current generating systems, from which most of the large-metropolitan systems have developed, sub-division in a number of generating stations limited the mower which could be developed at 1 21 ,r
doi:10.1109/t-aiee.1920.4765322 fatcat:zkmeanj2lnh4dcbftpywlux4sa