Abstract
Steel mills in Bangladesh are concentrated in the Chittagong region. Some of these steel mills are installing electric arc furnace (EAF). EAFs generate sub-synchronous frequencies (SSFs) which may pose threat to nearby turbine-generator shaft by causing torsional resonance (TR). This paper presents an investigation into TR due to EAF operation in the Chittagong region of Bangladesh Power System (BPS). Multiple AC EAFs installed in two steel mills in close proximity has been considered. In the mathematical model of the EAF, electric arc resistances are varied deterministically in the frequency range of 1.2–45.5 Hz to meet the characteristics of realistic EAF. FFT technique has been used to find the torsional mode frequencies of the T-G shaft. Simulations show considerable TOTs amplification due to EAF operation. Simulations show possible T-G shaft damage in the Raozan and Shikalbaha power plants in the long run.
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