Abstract
Many large industrial enterprises, in particular in metallurgy, currently use high-power AC electric drives based on frequency converters with active rectifiers. These converters, as a rule, have an input voltage from 3.15 to 3.5 kV and are connected to the internal distribution network of 6-35 kV using matching transformers. With a large length of cable lines in a network of 6 - 35 kV, conditions may arise for the development of current resonance in the frequency range coinciding with high-frequency harmonics generated by frequency converters with active rectifiers. At the same time, dangerous voltage distortions can occur in the 6-35 kV network, leading to an emergency shutdown or failure of equipment sensitive to power quality. To determine the best way to eliminate these distortions, it is necessary to know the shape of the frequency response of the in-house power supply system. The purpose of these studies is to develop an improved method for diagnosing resonant phenomena in the intra-factory network 6-35 kV due to test effects from active rectifiers. The studies were carried out using a simulation model of the "network - frequency converter with an active rectifier" system, as well as on the basis of the results of experimental studies on the operating electrical equipment of metallurgical enterprises.
Keywords
internal power supply network, power system, power quality, frequency converter, active front end, pulse width modulation, electromagnetic compatibility, current resonance, frequency characteristic
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