Estimation of Synchronous Machine Parameters by Stand Still Frequency Responses Testing

Abstract

This paper presents a general method based on the standstill frequency response (SSFR) tests cited in IEEE Std 115-A. The used methodology consists of determining the frequency response of the measured values of the direct axis and quadrature operational inductances. Subsequently, we identify the different models of transfer functions, which are functions of time constants, using curve-fitting techniques. Then considering the time constants as inputs and the parameters of the equivalent circuits of the synchronous machine as outputs. We can identify all the parameters of different topologies of the models, using the numerical Newton Raphson method. The approach used is inexpensive, accurate, and reliable.