Papaika Y. Energy efficiency of power supply systems of mining enterprises with nonlinear loads

The dissertation thesis focuses on solution of a cutting-edge scientific and technical problem of energy efficiency of mine power supply systems with heavy non-linear loads by ensuring optimal indicators of reliability and high quality of power supply. The thesis develops the theory of electromagnetic compatibility in conditions of the increase in the number of converters in electric networks. It is proved that effective use and reduction of the final power consumption can be achieved due to unique technological features of mining electric equipment, which allows to ensure the standard mode of the system operation when the energy system capacity decreases, and to control the processes of electric power consumption. The problem of predicting the power losses under changing conditions of decentralized electric network was solved on the basis of the theory of electromagnetic compatibility. The impact of the network mode parameters and converters’ indicators on resonance phenomena in power supply systems is studied. Recommendations are compiled to ensure selection of the rational parameters of compensators in the circuits of 6-10 kV and 0,4-0,66 kV while solving the optimization problem of minimizing active power losses. Keywords: energy efficiency of power supply systems, electromagnetic compatibility, reliability, frequency converters, higher harmonics, interharmonics, mathematical modeling, bench research.