The article presents the results of studies of the power quality problem, electromagnetic transients of the power supply system of the energy complex of the MPEI National Research University . The practical examples given in the publication are focused on the possibilities and efficiency of using digital technologies for analyzing the operating modes of electrical equipment which are implemented in modern multifunctional intelligent devices BINOM3. Studies of the quality of electrical energy at the Power Station of MPEI revealed deviations in the 35th harmonic component of the voltage. As a result of physical experiments and digital processing of electrical signals, it was found that the sources of distortion introduced into the external electrical network are the rectifying blocks switched in the control circuit of the generator excitation. These schemes of two-(six)-half-period rectification are available in the electric machine excitation system of the generator with a DC generator, in the circuits of the electromagnetic corrector and the current compounding scheme. Based on research and analysis of electromagnetic and electromechanical transients at the Power Station of MPEI, indicators of power quality in non-stationary modes of operation of the power complex were assessed. It is established that the sensitivity and speed of the frequency control system, power and excitation of the turbine generator fully comply with the requirements of GOST 32144.