Abstract
This article deals with the way to improve the power quality in in-plant networks of industrial plants with powerful frequency converters with active rectifiers (FC with AF) through the use of specialised passive filters. In recent years, the FC with AFs have become very widespread due to their advantages, such as: 1) possibility of energy recovery in braking modes of electric drive; 2) support of the set value of power factor at the input of AR. At the same time, they have a significant disadvantage, which is the deterioration of voltage quality in the 6-35 kV power distribution network due to the imposition of high-frequency harmonics of input voltage and current of AR on the resonant area of the supply network frequency response. This disadvantage can be eliminated by using special passive filters in the in-plant power networks, which ensure that the main resonance of currents is shifted to a zone free from high-frequency harmonics of the FC with AR. This makes it possible to reduce the harmonic distortion coefficient in the voltage sections of the enterprise MSS. The article presents the results of research on the application effectiveness of specialized passive filters in the system of in-plant power supply of the rolling complex, functioning at CherMK of PJSC "Severstal".
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