Synchronous machine parameters from sudden-short tests by back-solving

The calculation of synchronous machine parameters from sudden short-circuit measurements has been subject to unnecessary assumptions and approximations. The authors describe the nature of these approximations and a procedure to remove them, and illustrate how a new philosophy for problem formulation and solution using backsolving programs can simplify and clarify the solution process. They introduce a method of calculating eigenvalues that is based on a generalization of the eigenvalue problem. Approximations are unnecessary, and the formulation is much cleaner than in previous efforts. Even for large values of armature resistance, the time constants are correctly computed, since the coupling between axes is considered.<>