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RISS 인기검색어
- 검색키워드
- 저자 : A. Rami Reddy (검색결과 3 건)
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Dashtdar Masoud,Sarada K.,Hosseinimoghadam Seyed Mohammad Sadegh,Kalyan C. H. Naga Sai,Venkateswarlu A. N.,Goud B. Srikanth,Reddy C. H. Rami,Belkhier Youcef,Bajaj Mohit,Reddy B. Nagi 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.5
In the discussion of fault location due to the existence of multiple branches in the distribution network, diff erent locations are obtained and this shows the importance of detecting the faulted section in the distribution network . In this paper, the new idea of modulating the current and three-phase voltage of the line’s beginning and histogram analysis has been used for fault location in the power network. First, threephases of current and voltage of the line’s beginning are converted separately through convolution into a modulated current signal and a voltage signal, respectively. Then by dividing the density ratio of the modulated voltage by the modulated current, the distance to fault location can be estimated; but there is the possibility of obtaining several fault locations in the distribution network. In the following, the faulted section can be estimated through a histogram analysis of the modulated voltage. Simulation results show that by modulating the three-phase voltage, there is a possibility to eliminate the eff ects of fault resistance, fault occurrence angle, fault type on the algorithm’s accuracy. In the end, the suggested algorithm was implemented on a 735 kV transmission network and an IEEE-15bus distribution network whose results demonstrate the appropriate accuracy of the suggested algorithm.
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Hybrid ROCOF Relay for Islanding Detection
Rami Reddy Ch.,Harinadha Reddy K.,Aymen Flah,Srikanth Goud B.,Bajaj M.,Abdulaal M. J.,Milyani A. H. 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.1
Distributed generation (DG) is increasing in day to day life to meet the global energy consumption demand. One of the major problems with such DG is islanding. The islanding is caused in the grid connected system when a part of DG is disconnected from the main grid and continues to feed the load connected. As per the IEEE 1547 DG interconnection standards, the islanding should be detected within 2 s after islanding. This paper presents, a new rate of change of frequency (ROCOF) based hybrid islanding detection approach. It combines the passive and active ROCOF methods. The simulation results indicate this method is very effi ciently classifying the islanding and non islanding events. It detects the zero power balanced islanding within 200 ms and unbalanced islanding within 100 ms. The simulation results are carried on Matlab/Simulink 2018B environment.
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Modelling and experimental investigations on stepped beam with cavity for energy harvesting
A. Rami Reddy,M. Umapathy,D. Ezhilarasi,G. Uma 국제구조공학회 2015 Smart Structures and Systems, An International Jou Vol.16 No.4
This paper presents techniques to harvest higher voltage from piezoelectric cantilever energy harvester by structural alteration. Three different energy harvesting structures are considered namely, stepped cantilever beam, stepped cantilever beam with rectangular and trapezoidal cavity. The analytical model of three energy harvesting structures are developed using Euler-Bernoulli beam theory. The thickness, position of the rectangular cavity and the taper angle of the trapezoidal cavity is found to shift the neutral axis away from the surface of the piezoelectric element which in turn increases the generated voltage. The performance of the energy harvesters is evaluated experimentally and is compared with regular piezoelectric cantilever energy harvester. The analytical and experimental investigations reveal that, the proposed energy harvesting structures generate higher output voltage as compared to the regular piezoelectric cantilever energy harvesting structure. This work suggests that through simple structural modifications higher energy can be harvested from the widely reported piezoelectric cantilever energy harvester.
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