Reliability Comparison of Rural & Urban LVDS Networks with Corresponding HVDS Networks Including Substation Reliability
G Vasantha1, E. Vidya Sagar2
1G Vasantha, Department of Electrical Engineering, University College of Engineering, Osmania University, Hyderabad, Telangana, India.
2Dr. E. Vidyasagar, Department of Electrical Engineering, University College of Engineering, Osmania University, HYDERABAD, Telangana, India.
Manuscript received on 27 September 2023 | Revised Manuscript received on 05 October 2023 | Manuscript Accepted on 15 October 2023 | Manuscript published on 30 October 2023 | PP: 58-67 | Volume-13 Issue-1, October 2023 | Retrieval Number: 100.1/ijeat.A43101013123 | DOI: 10.35940/ijeat.A4310.1013123
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Abstract: This paper primarily compares the reliability of an existing rural area and urban area LVDS (low-voltage distribution system) with their respective proposed HVDS (high-voltage distribution system) and includes their 33/11 kV Substation. Ring main substation and single bus bar substation configuration are considered for urban and rural distribution systems respectively. The reliability of a ring bus substation used in urban areas is higher than that of a single bus substation used in rural areas. The load point reliability indices are calculated considering both substation reliability indices and radial feeder indices. The substation failure rate is calculated using the overlapping outages approach, whereas the radial feeder indices are computed using the cut set approach. Furthermore, the LVDS Network is converted into the HVDS Network by replacing a high-voltage distribution transformer (DTR) that supplies a large number of customers with multiple small-rating distribution transformers near consumer terminals, each serving a smaller number of customers. This conversion results in a Minimum length of LT Lines in HVDS, leading to an improved voltage profile, reliability, and efficiency. In this paper, the disconnecting switches and alternative supply are also considered for both LVDS and HVDS Networks in the calculation of reliability to assess the radial distribution system (FMEA). Failure mode and effect analysis is used. This study utilises an LVDS and HVDS system, employing an alternative power source and disconnectors, to assess the reliability indices of the rural area network and urban area network distribution systems. In this paper, the critical distribution reliability indices to reduce system average interruption durations (SAIDI), Energy Not Supplied (ENS) and ASAI for LVDS and corresponding HVDS are calculated. The research idea is proposed on an Indian practical network.
Keywords: LVDS, HVDS, Reliability Evaluation, System Average Interruption Duration Index (SAIDI), Customer Average Interruption Duration Index (CAIDI), Energy Not Supplied (ENS) , Average Service Availability Index (ASAI).
Scope of the Article: Reliability