Abstract
Modern rolling mill electric drives are implemented using frequency converters with active rectifiers and synchronous motors. Compared to conventional DC electric drives, they provide superior energy efficiency, in particular, reduced adverse effects on the power supply network due to advanced pulse-width modulation algorithms and the ability to operate at unity power factor. Nevertheless, many industrial facilities still rely on DC electric drives based on the thyristor converter–motor system. In addition to the potential significant distortion of the supply voltage waveform on the busbars of the factory substation sections due to the overlap of higher harmonic components of the current consumed by the electric drive with the resonant region of the power network frequency response, the thyristor-based electric drives operation causes voltage deviation at the connection point due to reactive power consumption. Given their high-power ratings, such drives can significantly degrade power quality in the plant internal electrical supply system. This may not only impair the performance of the drives themselves but also cause operational issues in sensitive electrical loads connected to the same sections of the plant main step-down substation. This paper presents a comparative analysis of electromagnetic compatibility issues in AC and DC electric drives, investigates their root causes and evaluates technical solutions for their mitigation. Various approaches to ensuring EMC between electric drives and the power supply network in operational industrial environments are examined. Conclusions are drawn regarding the most suitable technical solutions based on the type of electric drive, the specific problem, technical and economic factors.
Keywords
automated electric drives, frequency converters, thyristor converters, power quality, power supply system, electromagnetic compatibility, network frequency characteristics, sensitive electrical receivers, special passive filters, harmonic components, voltage unsinusoidality
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