A REDUNDANT POWER SUPPLY ARCHITECTURE FOR SELF-HEALING SUBSTATION USING ULTRACAPACITORS

Vasuki Soni

Abstract: An Ultracapacitor storage based substation for the compensation of AC power loss or voltage drops in a Power distribution system is proposed. It allows input current feed in any voltage profile of the bay or a line. The system has been so designed that it would act as a compensating standby power source to be placed at weak points of stations, and with the substation devices like intelligent electronic devices (IED), Remote terminal unit (RTU) etc. instead of additional driving substations to support for auxiliary power. A dedicated power conversion arrangement with an adjoining control strategy for the regulation of voltage at the point of common coupling (PCC) in the event of strong noise or fluctuation is proposed. A detailed review has also been presented regarding the potentials of the Ultracapacitors to appreciate its performance. This paper also evaluates the current practices in the field of energy storage and compares Ultracapacitor with the technologies like Vented Lead acid batteries (VLAB) and other to assess the potential for replacing these with the new technologies. Also it is proved that the technology of Ultracapacitor is a strong contender for global market as reduces the carbon emissions and is eco-friendly. In this paper, the terminologies Ultracapacitor and EDLC are used interchangeably frequently but conceptually are same thing.

Keywords: Ultracapacitor, Electric double layer capacitor (EDLC), Protection Control and Monitoring (PCM),Leadacid battery, Hybrid energy storage system, Intelligent electronic devices (IED), MTBF (Mean time between failure), MTTR( Mean time to repair (down time)).

DOI: https://doi.org/10.15623/ijret.2014.0307012