Distorting and Unbalanced Impact over the Operation of an Electro-Energetic Group from an Electric Power Plant

The paper deals with the recording and analysis of electric quantities waveforms (voltages and currents) from the components of an electro-energetic group. The quality parameters of energies (and powers) are determined in distorting and unbalanced regimes. Based on the relations used for the determination of the quality factors of electric quantities and respectively for the determination of the active and reactive powers, an analysis is made. It is concerned with the waveforms from: the main generator stator, the auxiliary generator stator before the fully controlled rectifier with thyristors and from the main generator rotor (after the rectifier). Possible interdependencies between these quantities are determined. The reversed power circulations are explained, along with their possible causes. The performed analysis shows that it is necessary to perform a permanent local surveillance of the energy sources from a power system, watching on the power quality parameters