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Articles by K. Muthukumar
Total Records ( 2 ) for K. Muthukumar
  K. Muthukumar and S. Jayalalitha
  Distribution systems are the end nodes that connect the consumers and the power utility. Power loss in distribution lines are high due to unbalance loads and unequal conductor sizes, causes a large voltage drop along the feeder lines. Hence the consumers at end nodes are affected by low voltage problem. Voltage at different nodes of the distribution network must be controlled by controlling the reactive power flow. Reactive power can be injected near to the consumer end by connecting shunt capacitors to reduce the reactive component of line current and hence voltage drops. Identification of optimal location and shunt capacitor size renders enhancement in voltage profile, power loss reduction etc. Evolutionary Programming (EP) approach is adopted to find out best possible size of the capacitors to be placed for minimizing the active power loss. Voltage Stability Index (VSI) is computed for all nodes to indicate the potential point for reactive power compensation. EP uses the fitness function information directly, instead of its derivatives which makes EP, a highly flexible and robust when compared with the conventional optimization methods. The proposed technique is implemented on modified IEEE 13-bus unbalanced radial distribution system by removing the voltage regulator from the standard IEEE 13 bus test system.The simulation results shows that the proposed method can reduce power losses which highlight the capability of the proposed technique for minimizing the power loss in distribution systems.
  P. Kumarasamy , S. Vignesh , R. Arthur James , K. Muthukumar and A. Rajendran
  This study was aimed to estimate current levels of pollution indicator as well as many groups of human pathogenic bacteria and their seasonal variations in different locations of Cauvery river, South India. The samples were collected from 16 different sites along river from Stanley reservoir to estuary regions (Bay of Bengal). The microbiological scrutiny was performed during monsoon (2007), Winter, Summer and Spring (2008) seasons taken for the bacterial analysis of Total Viable Counts (TVC), Total Coliform counts (TC), Total Streptococci counts (TS) and also four different types of pathogenic bacterial load were counts, which are indicator organisms of pollution studies. Total viable counts were found in the range of 6.2-26.0 (x104) mL-1 in monsoon, 5.2-20.0 (x104) mL-1 in summer, 4.0-17.9 (x104) mL-1 in winter and 3.3-15.5 (x104) mL-1 in spring. The TC was found in the range of 4.1-21.0 (x103) mL-1, 3.6-17.0(x103) mL-1, 2.9-14.1 (x103) mL-1 and 2.3-12.0 (x103) mL-1, for TS, it was 4.3-18.0 (x102) mL-1, 3.2-13.0 (x102) mL-1, 2.6-11.0 (x102) mL-1 and 2.0-9.6 (x102) mL-1 during monsoon, summer, winter and spring, respectively. Counts of EC, SA/SH, SF and PA were in the range of 300-3700 mL-1, 20-280, 20-270 and 40-490 mL-1, respectively. The Cauvery river basin has been facing severe anthropogenic activities, mostly due to religious belief, dense population, municipal sewage and industrial waste confluences etc. A huge bacterial gene pool was obtained after this study which was indicative of immense bacterial diversity in the region.
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