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Joshi R.C.,Sardar Patel University | Thakar V.K.,A.D.I.T
Lecture Notes in Electrical Engineering | Year: 2015

Discrete sliding mode control (DSMC) has been investigated since last three decades. It has reached to point wherein a well-established theory as well as implementation reports is available in the literature. Advances in computer communication network with wired and wireless configurations have imposed a challenging problem for control community. The paper explores the utilization of DSMC approach for the admission control (AC) in communication network. To provide better QoS, communication networks require proper admission, congestion traffic, and collision and power control mechanisms. For the past several years, many feedback control methods have been used for the control of various parameters of communication networks. The work presented here proposes a new application of sliding mode control for AC in communication network. Proper AC mechanism may avoid uncertain congestion and traffic access in the network which may reduce power wastage. As computer communication networks deal with digital data and are inherently discrete in nature, the DSMC has been applied to discrete time system. AC mechanism restricts the number of users in the network to maintain better QoS by considering available bandwidth, congestion indicator, and buffer size as feedback. © Springer India 2015.

Patel K.V.,ADIT | Patel S.M.,ARCOGUL
International Journal of Structural Engineering | Year: 2011

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.

Shah P.H.,ADIT | Bhalja B.R.,Pandit Deendayal Petroleum University
IET Generation, Transmission and Distribution | Year: 2014

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.

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

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

Chothani N.G.,ADIT | Sharma V.,ADIT
2015 International Conference on Recent Developments in Control, Automation and Power Engineering, RDCAPE 2015 | Year: 2015

Distance relay may maloperate during power swing condition which can arise due to variation of heavy load and switching of adjacent loaded line. Hence, it is necessary to discriminate the fault condition and power swing condition in case of line protection. During fault on transmission line the reactive power & voltage will change drastically compare to power swing condition. This paper demonstrates a new method based on rate of change of reactive power and rate of change of voltage which effectively discriminates various types of fault and power swing conditions. The derivative of line reactive power & voltage variation is calculated by utilizing local end voltage & current signals. The proposed algorithm is evaluated by simulating various disturbances on two machine system of 220 kV network in PSCAD/EMTDC software package. The power swing conditions are simulated by fault isolation, change in mechanical input to turbine of generating stations, switching of heavy loads connected to bus and disconnection of heavily loaded parallel transmission line. Moreover, various types of short circuit faults are simulated on the transmission line including faults during power swing and high resistance fault. The proposed fault v/s power swing discrimination algorithm is executed in MATLAB software. © 2015 IEEE.

Chothani N.G.,ADIT | Sharma V.,ADIT
2015 International Conference on Recent Developments in Control, Automation and Power Engineering, RDCAPE 2015 | Year: 2015

This paper presents a new Current Transformer (CT) saturation detection scheme which is based on the waveform identification technique. The variation of secondary current at the time of saturation has been carried out using first order system and slope of current waveform envelope. The slope magnitude of current envelope may depend on low to high degree of saturation. Based on characteristic of current envelope and its slope magnitude, level of CT saturation can be estimated. The fault data with CT saturation condition are generated using the PSCAD/EMTDC software package and algorithm is implemented in MATLAB software. A low-pass, first order Butterworth filter with cutoff frequency of 400 Hz is used to smoothen the CT secondary current. Various parameters such as remanent flux, burden resistance and presence of DC offset are considered for the validation of the proposed algorithm. The simulation results show the effectiveness of the proposed method to detect CT saturation under varying system condition. © 2015 IEEE.

Chothani N.G.,ADIT | Bhalja B.R.,ADIT | Patel U.J.,ADIT
2012 International Conference on Advances in Power Conversion and Energy Technologies, APCET 2012 | Year: 2012

Medium and Low voltage busbar is important equipment in the electrical power system, and its protection demands simple, reliable, economic & sensitive relaying scheme. This paper presents design, implementation and testing of low voltage busbar relaying scheme in laboratory environment using TMS320LF2407A Digital Signal Processor (DSP). Current differential algorithm is designed based on the DSP platform which can reduce large amounts of calculation, expedite the protection's trip and reduces the hardware requirements. Authors have developed a laboratory prototype of the three-phase busbar system containing 3-phase bus, current transformers, line components, fault switches and DSP trainer kit. Experimental results are provided to verify the effectiveness of the proposed scheme. The scheme provides stability against external faults, sensitivity towards high resistance internal faults and better reliability in discriminating in-zone and out of zone faults. © 2012 IEEE.

Brahmbhatt K.N.,CHARUSET | Makwana R.M.,ADIT
Smart Innovation, Systems and Technologies | Year: 2016

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.

Chothani N.,ADIT | Bhalja B.,ADIT
Canadian Conference on Electrical and Computer Engineering | Year: 2011

The protection of busbar demands high integrity and high speed relaying scheme. This paper presents a new differential relaying scheme for the protection of busbar. The proposed scheme depends on the difference of the value of incoming and outgoing line currents of the respective phase at a particular bus. The proposed scheme has been tested extensively using the PSCAD/EMTDC software package with fault data generated, by modeling the existing 230 kV Indian power transmission systems. The proposed scheme provides stability against external faults, more sensitivity towards high resistance faults and better reliability in discriminating in-zone and out of zone faults. Moreover, the proposed scheme avoids the effect of early & severe CT saturation during heavy through faults. © 2011 IEEE.

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