Русская версия English version

Investigation into parallel operation of rolling mill automated electric drives and an electric arc furnace

A.A. Nikolaev, A.S. Denisevich, M.V. Bulanov

Vestnik IGEU, 2017 issue 3, pp. 59—69

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Abstract in English: 

Background: Electric drives of modern rolling mills have high-power synchronous (asynchronous) motors and frequency converters with active rectifiers (FC with AR). Automated electric drives based on FC with AR are not adapted to asymmetrical voltage sags occurring in the external power supply system, which may result in frequent converter tripping. The studies conducted earlier considered ways of voltage sag compensation by means of static var compensators (SVC) in arc furnace electric supply systems working in parallel with rolling mill FC with AR. But these works did not study the possibility of parallel work of the electric steelmaking complex and FC with AR under voltage asymmetry and voltage deviation produced by electric arc furnace (EAF) operation. All this makes it important to study the operating modes of frequency converters connected in parallel to an EAF-SVC complex.

Materials and methods: Experimental arrays of electrical parameters recorded at working complexes «EAF-SVC» and known methods of mathematical modeling of AR control systems are used in the investigation. The known methods of pulse width modulation (PWM) realized in series FC with AR were used to model control systems of AR.

Results: Parallel work of electric steelmaking and rolling mill complexes has been analysed for the cases of present and absent static var compensators. Based on these studies it has been proved for the first time that EAF and FC with AR can work in parallel.

Conclusions: The investigation results have theoretical importance for the theory of electric drive and power supply systems of industrial enterprises and can be used to design power supply systems of the main rolling mill electric drives, to choose the parameters of electrical circuits and control systems of FCs with AR if additional protection from external frequency sags is required for FCs with AR. 

Key words:  frequency converter, active rectifier, electric arc furnace, static var compensator, voltage asymmetry, voltage sag, power quality.

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Ключевые слова на русском языке: 
,преобразователь частоты, активный выпрямитель, дуговая сталеплавильная печь, статический тиристорный компенсатор, несимметрия напряжения, провал напряжения, качество электрической энергии
Ключевые слова на английском языке: 
frequency converter, active rectifier, electric arc furnace, static var compensator, voltage asymmetry, voltage sag, power quality
The DOI index: 
10.17588/2072-2672.2017.3.059-069
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