Abstract
The distinguishing feature of domestic metallurgical enterprises is the on-site power plants using secondary fuel gases as fuel, in particular, blast furnace and coke oven gases. Such power plants have a relatively complex system of in-house needs, an integral part of which are various electric drives, including variable frequency drives (VFD). Frequency converters (FC), which are the distinctive link of the specified electric drive systems, have certain technical features that must be considered in the design and operation process. The article considers the issue of providing the stable VFD operation of on-site power plants at metallurgical enterprises in case of external power supply interruptions. Various technical solutions are presented to improve the reliability of VFD systems. Possible ways of the FC and their individual parts backup are shown, the corresponding structural diagrams are given. It is proposed to use high-speed automatic transfer switch devices (high-speed ATS) as a means of implementing fast switching between the main and reserve inputs at various interruptions of the mains voltage. The possibility of using a static varcompensator for controlling the inputs state in systems which contain FC is considered. The features of the switched reluctance motors with increased stability to power supply disturbances are presented.
Keywords
Reliability of power supply, voltage interruptions, industrial power plants, reliable electrical receivers, electric drive of pumps, high-speed ATS, rectifiers backup, frequency converter, static var compensator, switched reluctance motor.
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