Research of electromagnetic interference levels in power supply systems of industrial enterprises

Purpose. To investigate the levels of non-sinusoidality and voltage asymmetry in the power supply system of the ferroalloy plant, provided that reactive power is compensated and distributed generation from solar power plants is available. The methods. The analysis of electromagnetic interference levels was performed based on data from experimental monitoring of voltage quality indicators by multi-channel recorders combined into SCADA. Modeling was performed using spectral analysis and fast Fourier transform methods. Electromagnetic phenomena of interference attenuation in electrical networks were modeled by schemes for replacing electrical network elements, taking into account the surface effect of the flow of higher harmonic currents. Findings. The results of an experimental study of electrical energy parameters under conditions of nonlinear and asymmetric loads of an industrial enterprise were obtained. Connecting capacitor banks (CB) to the load node with decentralized energy sources (solar power plants) significantly changes the nature of the amplitude-frequency characteristics and leads to resonance phenomena. Simulation modeling methods have revealed the zones of occurrence of resonant frequencies when the power system is limited. The originality. The dependences of the voltage non-sinusoidality indicators on the parameters of the enterprise's power supply system have been established. This allows us to determine the critical zones of occurrence of resonant frequencies and create conditions for preventing operational overvoltage’s during the operation of furnace equipment. Practical implementation. The obtained data for calculating the parameters of the equivalent circuit of the power supply system allow us to determine changes in the conditions for the occurrence of voltage resonances during damage to the transmission system and system limitations of load power due to military operations and emergency situations.