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Panchal, A. K.
- Performance Improvements with Advanced AC Drives in Plate Shearing Line at Steel Plant
Authors
1 Head-DSC Electrical & Automation, Essar Steel India Ltd., 27th km, SuratHazira Road, Surat, Gujarat, IN
2 Department of Electrical Engineering, Sardar Vallabhbhai National Institute of Technology, Surat, Gujarat-395007, IN
Source
Power Research, Vol 8, No 3 (2012), Pagination: 207–220Abstract
This paper represents the comprehensive study, analysis and results achieved by various data evaluation of AC drive system over DC drive system in Essar steel limited in India. With innovations in advanced direct torque control and vector control technologies, performance of AC drives is similar to DC drives in entire speed range. Usage of these advance speed control techniques in AC drives gives excellent results to achieve desired torquespeed characteristics, dynamic response and over load capabilities similar to DC drives. In February 2010, replacement of DC drive system by AC drive system was carried out in hot rolled plate shearing line (PSL), which is cut to length application line in steel plant. Before replacement, design calculation of AC system was carried out for matching the plant requirements. By various technical and fi nancial comparisons, it is found that use of AC drives is more economical in comparison with DC drives.AC drives ensure improvements on energy effi ciency, reliability and enhancement of production with reduction in cost, maintenance and equipment down time. After replacement of DC drives to AC drives, following performancs ase observed in PSL:Energy saving of 1.88 kWh/t.
Production rate increased from 55 t/h to 95 t/h.
Line speed increased from 19.5 meters per minute (m/min) to 23 m/min.
Line stoppage time reduced from 2000 minutes to 300 minutes per annum.
Keywords
Direct torque control, Variable speed AC drives, Energy effi ciency, Prouction rate, Return on investment.
- Power Factor Improvement in the Steel Plant with Advanced AC Drive System
Authors
1 Essar Steel Ltd, Surat-394270, IN
2 Department of Electrical Engineering, SVNIT, Surat – 395007, IN
Source
Power Research, Vol 8, No 4 (2012), Pagination: 417–428Abstract
This paper presents the analysis of power factor with DC drive system and AC drive system in one of the major steel plant in India. Replacement of DC drive system with AC drive system have drastically improved power factor of the system. With advanced direct torque control (DTC), performances of AC drives are similar to DC drives in entire speed-torque region. By various comparisons of technical and fi nancial parameters, it is found economical to use AC drives in place of DC drives. AC drives ensure improvements on power factor, energy effi ciency, reliability and production with reduction in cost, maintenance and equipment down time.
After comparing the DC drive system and AC drive system in pickling plant, the power factor improvement observed with AC drive system. The simulation studies also predicted that there will be improvement in average power factor from 0.2~0.65 to 0.93~0.97. Results obtained after replacement of DC drives with AC drives are quite matching with the predicted results. In addition, AC drive system also helped in energy saving and reduction in line stoppage occurrences.