Calculation of the angular back swing following a short circuit of aloaded alternator

The paper describes the development of a mathematical model which includes some of the phenomena commonly neglected in digital-computer studies. The model provides for the representation of damping more accurately than the simple method using a torque proportional to slip. For an even more accurate solution, it includes differential equations describing the variation of the flux linkages. Calculations are compared with test results of a large turboalternator incorporating a voltage regulator and governor, as well as with test results obtained from micromachine experiments at Imperial College, University of London, England. Calculated curves are included to show the detailed changes brought about by the more accurate equations. A comparative study is made of various methods and arrangements of numerical-integration techniques suitable for a digital computer. A table of comparative solution times is presented and the merits of the integration techniques are discussed.