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Protection and Control of Modern Power Systems 2021年第1期6卷 330-346页

作者： Nihar Karmakar biplab bhattacharyya Department of Electrical Engineering Indian Institute of Technology(ISM)Dhanbad826004India

This paper formulates and solves a techno-economic planning problem of reactive power (VAR) in power transmission systems under loadings. The objective of the proposed research work is to minimize the combination of installation cost of reactive power sources, power losses and operational cost while satisfying technical constraints. Initially, the positions for the placement of reactive power sources are determined technically. Different cost components such as VAR generation cost, line charging cost etc. are then added in the total operating cost in a most economical way. Finally, the optimal parameter setting subjected to reactive power planning (RPP) is obtained by taking advantages of hybrid soft computing techniques. For the justification of the efficiency and efficacy of the proposed approach the entire work is simulated on two inter-regional transmission networks. To validate the robustness and ease of the soft computing techniques in RPP the responses of benchmark functions and statistical proof are provided simultaneously.

关键词： Active power loss Reactive power planning Hybrid algorithm Line charging Operating cost

Demand side management for solving environment constrained economic dispatch of a microgrid system using hybrid MGWOSCACSA algorithm

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CAAI Transactions on Intelligence Technology 2022年第2期7卷 256-267页

作者： Sourav Basak Bishwajit Dey biplab bhattacharyya Department of Electrical Engineering Indian Institute of Technology(Indian School of Mines)DhanbadIndia Department of Electrical and Electronics Engineering Gandhi Institute of Engineering and TechnologyGunupurOdishaIndia

Microgrids are a type of restricted power distribution systems in which electricity is generated,transmitted,and distributed within a small geographic *** are used to ensure that renewable energy sources are used to their full *** provide further benefits,such as lowering transmission losses and the expenses associated with *** research compares and contrasts the aims of economic dispatch,emission dispatch,fractional programing based combined economic emission dispatch,and environmental restricted economic dispatch(ECED).A low-voltage microgrid system is investigated for three different *** a study optimization tool,an innovative,resilient,and strong hybrid swarm-intelligence optimization algorithm is utilised,which is based on combining the properties of the traditional grey-wolf optimiser,sine-cosine algorithm,and crow search *** employment of a time-of-use energy mar-ket pricing approach instead of a fixed pricing plan resulted in a 15%decrease in gen-eration costs throughout the course of the *** ECED was assessed with a 15%-20%demand side management based restructured load demand model for the microgrid system,the generation costs were reduced even further.

关键词： demand side management energy management MGWOSCACSA microgrid

Weak bus-constrained PMU placement for complete observability of a connected power network considering voltage stability indices

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Protection and Control of Modern Power Systems 2020年第1期5卷 314-327页

作者： Rohit Babu Saurav Raj biplab bhattacharyya Department of Electrical and Electronics Engineering Lendi Institute of Engineering and TechnologyJonnadaAndhra Pradesh 535003India Department of Electrical Engineering Institute of Chemical Technology MumbaiMarathwada CampusJalna 431203India Department of Electrical Engineering Indian Institute of Technology(Indian School of Mines)DhanbadJharkhand 826004India

Phasor measurement units(PMUs)are preferred for installation at weak buses in a power ***,the weak buses need to be located and the strategic locations of PMUs identified to ensure network ***,the primary aim of this work is to identify the placements of the maximum number of PMUs installed at the weak buses in the electrical *** voltage collapse proximity indicator,line stability index,fast voltage stability index,and a new voltage stability indicator utilizing load flow measurement are used to determine the weak buses.A novel deterministic methodology based on a binary-integer linear programming model is then proposed to determine the optimal locations of *** effect of a single PMU outage considering the weak buses is also *** effectiveness of the developed approach is tested and validated on the standard IEEE 14-,118-,300-,and New England 39-bus *** obtained results are also compared to those using different weak bus methodologies.

关键词： Binary integer linear programming Optimal PMU placement Observability Phasor measurement unit Voltage stability indices

Modified branch-and-bound algorithm for unravelling optimal PMU placement problem for power grid observability: A comparative analysis

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CAAI Transactions on Intelligence Technology 2021年第4期6卷 450-470页

作者： Rohit Babu Saurav Raj Bishwajit Dey biplab bhattacharyya Department of Electrical and Electronics Enginecring Lendi Institute of Engincering and TechnologyJonnadaAndhra PradeshIndia Department of Electrical Engineering Institute of Chemical Technology-MunbaiMarathwada CampusJalnaMaharashtraIndia Department of lectrical Engineering IndianInstitute of TechnologyDhanbadJharkhandIndia

Safe operation of the power grid requires a complete and robust control network to ensure full observability;However,redundancy measurements can create problems in expense,management,and *** optimal phasor measurement unit(PMU)positioning problem(OPPP)is proposed to limit the number of PMUs deployed in the power grid and ensure the whole grid's observability in the meantime.A modified branch-and-bound algorithm(MBBA)to unravel the OPPP is *** BBA,which uses a single search order to create a binary tree,gives only one solution to the OPPR although more than one optimal solution *** proposed MBBA method consists of two different stages:the vertexes in the search tree are investigated by depth-first search(DFS)in stage 1,and the search route continues as the breadth-first *** stage 1,the LP relaxing problems are solved by dual simplex,and in stage 2,the basic viable solution from stage 1 is used to configure the primary simplex until the optimum solution is *** is formulated as a binary decision variable MBBA model,minimizing linear objective function subject to linear matrix observability *** MBBA model is unravelled using a linear integer-based external approximation *** test systems are used to check the feasibility of the proposed *** software performs simulation based on a number of graph theory-based methods such as DFS,graph-theoretical method,simulated annealing,and recursive *** algorithms are compared to the algorithmic perspective of the proposed MBBA *** test network results confirm the validity of the proposed methodology.

关键词： optimal branch observability

Large soft-sediment deformation structures(SSDS) in the Permian Barren Measures Formation, Pranhita-Godavari Valley, India:potential link to syn-rift palaeoearthquake events

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Journal of Palaeogeography 2020年第2期9卷 198-215页

作者： biplab Bhattacharya Abhirup Saha Department of Earth Sciences Indian Institute of TechnologyRoorkee 247667India

Records of palaeoearthquakes in sedimentary rocks are often debated due to the potential confusion in distinguishing seismic versus aseismic trigger mechanisms causing *** present paper documents some unique soft-sediment deformation structures(SSDS),characterized by their extremely large size,complex morphology and preservation in coarse-grained pebbly *** SSDS are present in the Permian Barren Measures Formation,a syn-rift depositional unit within the Lower Gondwana succession in the Pranhita-Godavari Valley,eastern Peninsular ***^210 m thick succession is represented by stacked fining-up retrogradational cycles,characterized by coarse-grained trough cross-stratified pebbly sandstones near the base and fine-grained heterolithic sandstones–mudstones at the *** cycle signifies a change from fluvial-to tidal-influenced depositional ***-grained pebbly sandstone beds near the base of each cycle record most SSDS,including complexly deformed layers,pseudonodules,load and flame structures,various water-escape structures like vertical/inclined sediment columns(sedimentary dykes)and contorted beds,and syn-sedimentary *** deformed beds are underlain and overlain by the undeformed *** deformed SSDS are often sharply truncated at the top by undeformed beds manifesting syn-sedimentary character,which signifies that deformation took place just after deposition of the affected beds,but before deposition of the overlying beds while sedimentation was *** analysis reveals the absence of processes like storms/pounding waves,slumps,rapid dumping(massive beds),impact shaking,volcanisms,tsunami waves or sediment gravity flows in the study area,thus negating their possibility as triggering agents for the *** complex nature and large size of the deformation structures imply extensive liquefaction near the sediment–water *** addition,the deformed beds comply with most of the criteria of typic

关键词： Large SSDS Seismites Fluvial-tidal Syn-rift Gondwana Permian

Electronic and magnetic properties at rough alloyed interfaces of Fe/Co on Au substrates: An augmented space study

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Chinese Physics B 2016年第5期25卷 298-304页

作者： Priyadarshini Parida biplab Ganguli Department of Physics & Astronomy National Institute of Technology Rourkela

We studied the interface electronic and magnetic properties of Fe/Co deposited on Au substrate and researched the effects of roughness at the interfaces within augmented space formalism （ASF）. The full calculation is carried out by recursion and tight-binding linear muffin tin orbital （TB-LMTO） methods. The amount of roughness is different at different atomic layers. The formalism is also applied to sharp interface, when interdiffusion of atoms is negligible. Our results of one monolayer transition metal agree with other reported results. A realistic rough interface is also modeled with three and four monolayers of transition metals, deposited on Au substrates.

关键词： augmented space formalism tight-binding linear muffin tin orbital rough interface magneticproperties

Progenitor model of cosmic ray knee

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Research in Astronomy and Astrophysics 2016年第1期16卷 51-58页

作者： biplab bijay arunava bhadra High Energy & Cosmic Ray Research Centre University of North Bengal Siliguri WB 734013 India

The primary energy spectrum of cosmic rays exhibits a knee at about 3 PeV where a change in the spectral index occurs. Despite many efforts, the origin of such a feature in the spectrum is not satisfactorily solved yet. Here it is proposed that the steepening of the spectrum beyond the knee may be a consequence of the mass distribution of the progenitor of the cosmic ray source. The proposed speculative model can account for all the major observed features of cosmic rays without invoking any fine tuning to match flux or spectra at any energy point. The prediction of the proposed model regarding the primary composition scenario beyond the knee is quite different from most of the prevailing models of the knee, and thereby can be discriminated from precise experimental measurement of the primary composition.

关键词： cosmic rays -- acceleration of particles -- black hole physics

Heat transfer in boundary layer stagnation-point flow towards a shrinking sheet with non-uniform heat flux

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Chinese Physics B 2013年第7期22卷 328-333页

作者： Krishnendu bhattacharyya Department of Mathematics The University of Burdwan

In this paper, the effect of non-uniform heat flux on heat transfer in boundary layer stagnation-point flow over a shrinking sheet is studied. The variable boundary heat fluxes are considered of two types： direct power-law variation with the distance along the sheet and inverse power-law variation with the distance. The governing partial differential equations （PDEs） are transformed into non linear self-similar ordinary differential equations （ODEs） by similarity transformations, and then those are solved using very efficient shooting method. The direct variation and inverse variation of heat flux along the sheet have completely different effects on the temperature distribution. Moreover, the heat transfer characteristics in the presence of non-uniform heat flux for several values of physical parameters are also found to be interesting.

关键词： non-uniform heat flux heat transfer stagnation-point flow shrinking sheet

Boundary Layer Flow and Heat Transfer over an Exponentially Shrinking Sheet

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Chinese Physics Letters 2011年第7期28卷 198-201页

作者： Krishnendu bhattacharyya Department of Mathematics the University of BurdwanBurdwan-713104West BengalIndia

An analysis is made to study boundary layer flow and heat transfer over an exponentially shrinking *** similarity transformations in exponential form,the governing boundary layer equations are transformed into self-similar nonlinear ordinary differential equations,which are then solved numerically using a very efficient shooting *** analysis reveals the conditions for the existence of steady boundary layer flow due to exponential shrinking of the sheet and it is found that when the mass suction parameter exceeds a certain critical value,steady flow is *** dual solutions for velocity and temperature distributions are *** increasing values of the mass suction parameter,the skin friction coefficient increases for the first solution and decreases for the second solution.

关键词： solution method exponential

Dual Solutions in Unsteady Stagnation-Point Flow over a Shrinking Sheet

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Chinese Physics Letters 2011年第8期28卷 165-168页

作者： Krishnendu bhattacharyya Department of Mathematics The University of BurdwanBurdwan-713104West BengalIndia

An analysis is made to study the dual nature of solution of unsteady stagnation-point flow due to a shrinking *** similarity transformations,the governing boundary layer equations are transformed into the self-similar nonlinear ordinary differential *** transformed equations are solved numerically using a very efficient shooting *** study reveals the conditions of existence,uniqueness and non-existence of unsteady similarity *** dual solutions for velocity distribution exist for certain values of velocity ratio parameter(c/a),and the increment in the unsteadiness parameter A increases the range of c/a where solution ***,with increasing A,the skin friction coefficient increases for the first solution and decreases for the second.

关键词： solution method unsteady