Power Research

Deepak S. Jain ¹, Manas Kundu ², Mohan V. Aware ³

Affiliations
1 M. Tech Student, Electrical Engineering, Visvesvaraya National Institute of Technology, Nagpur - 440010, IN
2 Director, Energy Solutions, International Copper Association India, 302, Alpha, Hiranandani Business Park, Powai, Mumbai – 400076., IN
3 Professor, Electrical Engineering, Visvesvaraya National Institute of Technology, Nagpur-440010, IN

Abstract

The steel re-rolling industries are one of the major industries in the world. As they are growing with very fast rate with an increase in demand, their power quality problems are also increasing with the same rate. This paper presents these power quality impediments, its causes, effects and solutions. This paper encourages the organizations who deal with international standards to develop some standards for controlling these kinds of problems. Real time measurements and simulation modelling both have been presented in this paper, for the steel re-rolling industries and their results have been compared.

Keywords

Steel Re-Rolling Mill (SRRM), Power Quality (PQ), harmonics, saturation, voltage sag, voltage swell, Total Harmonic Distortion (THD).

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Mahesh H. Pandya ¹, Mohan V. Aware ¹

Affiliations
1 Department of Electrical Engineering, Visvesvaraya National Institute of Technology, Nagpur - 440011, IN

Abstract

This paper presents a sizing methodology and optimal operating strategy for a battery energy storage system (BESS) to improve the operating efficiency of distributed networks. The alternate solution to network reinforcement is given by providing the optimal energy storage device. The targeted issues of loss reduction and possible local voltage control are investigated. The relation of feeder losses with requirements of the energy storage requirements are presented through mathematical modeling with actual distribution network parameters. This investigation is carried out with different types of the feeders viz. urban, rural and industrial. The case studies are presented with actual site data obtained from the Maharashtra State Distribution Company of India.

Keywords

Energy storage, Modeling, Power distribution, Voltage control

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Vasudeo B. Virulkar ¹, Mohan V. Aware ²

Affiliations
1 Asst. Professor, Electrical Engineering, Govt. College of Engineering, Amravati-444604, IN
2 Professor, Electrical Engineering, Visvesvaraya National Institute of Technolog, Nagpur-440010, IN

Abstract

This paper investigates the causes of harmonic norms violations in the medium scale (less than 2 MW load) re-rolling industry paying for the penalty. The major drive motor in this industry draws the heavy current with deep in the voltage at the terminal of the motor when steel bars are re-rolled with steps passes. To overcome the problem of voltage deep, the taps of the distribution transformer supplying these loads are selected on higher side. This situation leads to the over excitation of the transformer during the light load condition (between the passes) of the re-rolling operation resulting the operation of transformer in nonlinear zone. During this operation the harmonics due to saturation are generated and injected into the distribution systems and are the cause for damages to the capacitor banks. This problem is analyzed by mathematical modeling of the load condition with the transformer. The site investigation is carried out using power analyzer Megger-PA-9 plus V604 and supported by the simulation in PSCAD/EMTDC. This investigation leads to suggesting the remedial measures which is implemented to accommodate the harmonics inconformity with IEEE-519 standard.

Keywords

Filters, Harmonics, Nonlinear Loads, Power Factor Correction Capacitors, Saturable Devices.

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