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Zaveri T.,VNSGU | Bhavesh B.,ADIT | Zaveri N.,C.K.P.C.E.T
2011 IEEE International Electric Machines and Drives Conference, IEMDC 2011

Distribution Static Compensator (DSTATCOM) is a custom power device used for power quality improvement in distribution system. The control techniques applied to the DSTATCOM play a major role in its performance. This paper presents comparative study of the reference current generation techniques using voltage source converter based DSTATCOM for reactive power compensation, source current balancing and harmonic mitigation in delta connected load. Different control techniques such as Instantaneous reactive power theory, Synchronous reference Frame theory and Symmetrical component theory have been used in this paper. Reference currents generated by control techniques have been tracked by the compensator in a hysteresis band control scheme. Dynamic simulation of the DSTATCOM for different control strategies has been carried out in MATLAB/Simpower system environment. Simulation results demonstrate the performance and feasibility of various control techniques for DSTACOM. © 2011 IEEE. Source

Brahmbhatt K.N.,CHARUSET | Makwana R.M.,ADIT
Smart Innovation, Systems and Technologies

Complementary multi-focus and/or multi-model data from two or more different images are combined into one new image is called Image fusion. The main objective is to decrease vagueness and minimizes redundancy in the output while enhancing correlate information specific to a task. Medical images coming from different resources may often give different data. So, it is challenging task to merge two or more medical images. The fused images are very useful in medical diagnosis. In this paper, image fusion has been performed in discrete wavelet transform (DWT) and Contourlet transform (CNT). As a fusion rule, spatial techniques like Averaging, Maximum Selection and PCA is used. Experiments are performed on CT and MRI medical images. For evaluation and comparative analysis of methods, a set of standard performance measures are used. This paper’s results show that, the Contourlet method gives a good performance in medical image fusion, because it provides parabolic scaling and vanishing moments. © Springer India 2016. Source

Patel K.V.,ADIT | Patel S.M.,ARCOGUL
International Journal of Structural Engineering

This paper considers the management of buildings for fire safety. It is found that fire and the associated effects on buildings is significantly different to other forms of loading such as gravity live loads, wind and earthquakes and their respective effects on the building structure. Fire events are derived from the human activities within buildings or from the malfunction of mechanical and electrical equipment provided within buildings to achieve a serviceable environment. It is therefore possible to directly influence the rate of fire starts within buildings by changing human behaviour, improved maintenance and improved design of mechanical and electrical systems. Furthermore, should a fire develops, it is possible to directly influence the resulting fire severity by the incorporation of fire safety systems such as sprinklers and to provide measures within the building to enable safer egress from the building. The ability to influence the rate of fire starts and the resulting fire severity is unique to the consideration of fire within buildings since other loads such as wind and earthquakes are directly a function of nature. The possible approaches for designing a building for fire safety are presented using an example of a multi-storey building constructed over a railway line. The design of both the transfer structure supporting the building over the railway and the levels above the transfer structure are considered in the context of current regulatory requirements. The principles and assumptions associated with various approaches are discussed. © 2011 Inderscience Enterprises Ltd. Source

Shah P.H.,ADIT | Bhalja B.R.,Pandit Deendayal Petroleum University
IET Generation, Transmission and Distribution

Nuisance fuse blowing because of miscoordination between fuse and recloser in power distribution network is very critical issue particularly when distributed generations (DGs) are incorporated. This study presents a new adaptive digital relaying scheme for power distribution network containing DG, which circumvents miscoordination between recloser and fuse. It is based on calculation of the ratio of feeder current and recloser current. With the help of this philosophy, the proposed scheme automatically modifies the time dial setting of the relay and hence enhances margin between fuse and recloser in order to avoid miscoordination between fuse and recloser. The proposed scheme has been extensively tested for various types of faults in radial distribution network containing DG. Fault data are generated by modelling an existing part of 11 kV Indian power distribution network using PSCAD/EMTDC software package. Furthermore, the impact of different DG capacities on the margin (coordination) between fuse and recloser are also analysed. It has been observed that the proposed scheme maintains proper coordination between fuse and recloser for all types of fault. Moreover, it also provides satisfactory operation during high resistance single line-to-ground faults. © The Institution of Engineering and Technology 2014. Source

Bhalja B.,ADIT | Shah P.H.,ADIT
2011 IEEE Recent Advances in Intelligent Computational Systems, RAICS 2011

Due to the fast-paced changing technologies in the field of electricity market liberalization, the incorporation of Distributed Generation (DG) along with its various distributed resource technologies have led to a profound change in electrical power system. Besides many positive impacts of incorporation of DG into the electrical power system, it has introduced many inherent technical problems such as miscoordination, reliability degradation and stable islanding. This paper originates from the report of IEEE Power System Relaying Committee and on having observed the malfunctioning of Electricity boards by the authors at local and regional level due to DG interconnections with regards to the miscoordination of relay. A laboratory prototype of three phase radial distribution network containing DG is presented in this paper. By executing number of single line-to-ground faults at different locations in various sections of radial distribution network containing DG, numbers of maloperations due to miscordination of relay have been observed by the authors. Time of operations of all the relays of radial distribution network obtained from the developed laboratory prototype for different fault locations in various sections have been found to be in close conformity with the theoretical values obtained using an IEC standard relay characteristics equation. © 2011 IEEE. Source

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