A new approach to determine parameters of synchronous machine using wavelet transform and Prony algorithm

Based on the wavelet transform and the Prony algorithm, a new method is presented to determine parameters of synchronous machine from sudden balanced short-circuit test. An appropriate wavelet function is chosen to analyze the sudden balance short-circuit transient current and the DC and fundamental component of the transient short-circuit currents are obtained by the wavelet transform. Compared with the traditional methods, the analysis using wavelet transform is more effective. Thus, the precise transient parameters and aperiodic component time constant are estimated by the least square algorithm. Meanwhile, the precise subtransient parameters are estimated through the Prony algorithm. At last, the test of sudden balanced short-circuit are carried out in a three-phase synchronous machine. The test results show that the method developed in this paper is valid.