Analysis of the Asynchronous Generator Voltage and Current Distortions after a Sudden Load Rejection

摘要

In the paper load rejection test, provided at a hydro power plant in Sweden, equipped with asynchronous generators, is described and analysed from the electromechanical transient processes and signal distortions points of view. During the test, the shunt capacitors and generator terminal voltages and currents are digitized, recorded and thereafter off-line processed by using Newton Type Algorithm, an efficient non linear estimator. Estimator is utilized for the unknown signal model parameters estimation. The main goal was to investigate the frequency changes and the distortions of the signals processed. Particularly, the frequency changes and the total harmonic distortion factors before and after the instance of load rejection are estimated and discussed. The results given in the paper presents the features of the numerical algorithm used when real data are processed.