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Improvement of the technological process of steelmaking and higher requirements to reduce production costs in the competitive market conditions require the use of more economical and flexible systems of power supply for powerful motors. That is why large synchronous motors are not supplied directly from the network of the three-phase alternating current, but through frequency converters, which leads to a change in not only energy, but also to sustainability of electrical load as a whole. Such a transition, on the one hand, increases the energy efficiency of production at the expense of reducing electricity consumption. On the other hand, synchronous motors are no longer reactive power sources that can at the big electrical distance reduce resistance of motors operating in parallel with the grid. This article deals with analysis of static stability of synchronous motors in the load node containing large synchronous motors powered both through frequency converters, and directly from the power grid, as well as distributed generation sources of relatively small power using the developed software complex. Some recommendations are given aimed at improving of static stability of synchronous motors. The research group investigated variation of energy consumption of blowers as major consumers of electric energy at the oxygen converter shop when inverters designed for start-up are replaced with fully adjustable frequency converter and simultaneous rebuilding of the technological scheme of their operation using power-supply system of the OJSC “Magnitogorsk Iron and Steel Works” as an example. On the basis of the experimental data, the authors carried out analyses of changes in parameters of the blowers when inverters designed for start-up were replaced with frequency converters for permanent operation. The selected cyclograms of the drive and pantograph operation were studied. The authors developed activities to increase the energy efficiency of new actuators in terms of frequency and time intervals of acceleration-braking. The obtained data can serve as a basis for further improving the energy efficiency of powerful synchronous motors with fan moment on the shaft resistance in different production cycles.


Synchronous generator, synchronous motor, static stability, industrial enterprise, load software, power supply system, energy efficiency, energy consumption, supercharger, frequency converter.

Aleksandr A. Bunin

Electrician, Joint Service Company LLC, Magnitogorsk, Russia.

Ol'ga V. Gazizova

Ph.D. (Eng.), Associate Professor, Electric Power Supply of Industrial Enterprises Department, Power Engineering and Automated Systems Institute, Nosov Magnitogorsk State Technical University, Magnitogorsk, Russia.

Vladimir M. Tarasov

Ph.D. (Eng.), Electric Equipment Service Chief Foreman, Magnitogors Iron and Steel Works OJSC, Magnitogorsk, Russia.

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