5_4_8 - Kuldeep Sahay Bharti Dwivedi J Electrical Systems...

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Corresponding author : Kuldeep Sahay Electrical Engineering Department, Institute of Engineering & Technology,Lucknow Uttar Pradesh Technical University, Lucknow. UP, India. E-mail: [email protected] Copyright © JES 2009 on-line : journal.esrgroups.org/jes Kuldeep Sahay Bharti Dwivedi J. Electrical Systems x-x (2009): x-xx Regular paper Supercapacitors Energy Storage System for Power Quality Improvement: An Overview Power quality problem causes a misoperation or failure of end user equipments. Distribution network, sensitive industrial loads and critical commercial operations suffer from outages and service interruptions which can cost financial losses to both utility and consumers. In India the use of electronic loads is increasing very fast and the gap between demand and the supply have made the reliability and power quality a critical issue. Further there is continuous thrust on optimal utilization of the non-conventional energy sources along with the central power station. In this paper a critical review have been presented chronologically various work to improve quality of power with the help of energy storage device i.e. Supercapacitors energy storage systems for ASD, elevators, UPS, and power distribution system, ride through capability, real power injection and reactive power injection for stabilization of the system. Keywords : Power Distribution System, Supercapacitors Energy Storage System, Distributed Generation, Reliability, Power Quality, Equivalent Series Resistance and Equivalent Parallel Resistance. 1. Introduction The first complete electric power system was built by the Thomas Edison in September 1882 in the New York city ;through the steam driven dc generator supplying at 110 Volt. Due to dc system and low voltage level; the losses in transmission line (I 2 R) puts the limitation for the long distance transmission of the power. After development of the transformer and ac transmission system by L.Gaulard and J.D. Gibbs led to ac electric power system. In the year 1889, the first ac transmission line in North America was put in to operation in Oregon between Willamette falls and Portland. So the literature reveals that the power system was inherently of dispersed generation nature or decentralized generation i.e. distributed generation (DG) is no new concept [1]. Nowadays the power system is in a process of undergoing from regulated market to deregulated, centralized to more localized system that are situated to near the load; the reason behind the increased concern for environment, to utilize renewable energy technologies, flexibility , lower initial investment costs, lower time of project completion, electricity market liberalization, developments in DG technology, constraints on the construction of new transmission lines, increased customer demand for highly reliable electricity [2,3] .Further with the fast increase in electronic loads has made the quality of power supply a critical issue .Since the power distribution system must be able to supply
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