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Prasad Raju A.,Sree Chaitanya Institute of Technological science | Amarnath J.,P.A. College | Subbarayudu D.,G Pulla Reddy Engineering College
International Review on Modelling and Simulations | Year: 2011

Several of the key issues in power system operation may be assessed quite effectively by resorting to power flow and derived studies. In large-scale power flow studies the Newton- Raphson method has proved most successful owing to its strong convergence characteristics. This paper explains the computation of Jacobian matrix containing first order derivative elements using Automatic Differentiation technique an innovative program transformation technique to obtain derivatives of functions implemented as programs. Main program need to be coded only for computation of numeric power mismatch values, controlled quantity limits and matrix operations where as Automatic Differentiation technique computes Jacobian elements automatically and relieves the program developer from tedium coding of first order derivatives. The power flow problem is solved with a Newton-Raphson method and necessary derivatives for the power flow equations are computed based on an AD tool, namely ADMAT coded in MATLAB. This operator overloading tool also has the advantage of offering easy-to-use drivers for the computation of inherent sparse derivative matrices of the power flow equations. Numerical examples of power flow problem are made on test case coming from real-world problem and main power flow program coded in MATLAB; make the necessary calls to the functions of the ADMAT by passing required inputs as arguments to generate values of derivatives. In this paper Automatic Differentiation method is performed on a five-bus test system and results have been presented and analyzed. © 2011 Praise Worthy Prize S.r.l. - All rights reserved. Source

Vijaya Kumar G.,G Pulla Reddy Engineering College | Shoba Bindu C.,Jawaharlal Nehru University
Advances in Intelligent Systems and Computing | Year: 2016

IEEE 802.11-based wireless mesh networks (WMNs) are emerging as the promising technology to provide last-mile broadband Internet access. A WMN is composed of mesh clients (MCs) and mesh access points (MAPs). A mesh client has to associate with one of the MAPs in order to access the network. Since the client performance depends on the selected MAP, how to select a best MAP is an open research problem. The traditional association mechanism used in WLAN, is based on received signal strength (RSS) which received criticism in the literature as it does not consider many important factors such as access point load, channel conditions, medium contention, etc. This paper proposes a novel scheme of MAP selection in WMNs. The basic idea is to reduce the negative impact of low throughput clients over high throughput clients. The performance of our scheme is evaluated through simulations and we show that our scheme performs better than RSS-based association scheme. © Springer India 2016. Source

Reddy G.V.S.,G Pulla Reddy Engineering College
International Journal of Electrical Power and Energy Systems | Year: 2016

Saving of fuel cost can be done through proper commitment of available generating units. This paper presents a novel technique to solve the problem of unit commitment through sorting of units into different clusters based on Imperialistic Competition Algorithm (ICA). This sorting is implemented in order to decrease the overall operating cost and to assure the various constraints that involve minimum up/down. The technique of unit commitment is a significant assignment in the normal working of power systems which can actually be represented as a large scale minimization problem that involves non linear mixed integers. A new technique employing the concept of cluster algorithm called as additive and divisive hierarchical clustering has been used based on a new technique called as Imperialistic Competition Algorithm in order to carry out the technique of unit commitment. Proposed methodology involves two individual algorithms. Additive cluster algorithm has been employed while the load is increasing while divisive cluster algorithm has been used when the load is decreasing. The technique that has been developed has been tested on system with generating units in range of 10-100 and the superior performance of the technique has been reported through simulation results. © 2016 Elsevier Ltd. All rights reserved. Source

Reddy G.K.,G Pulla Reddy Engineering College
Proceedings of 2015 IEEE 9th International Conference on Intelligent Systems and Control, ISCO 2015 | Year: 2015

With increasing contribution of leakage in total active power, run-time leakage control techniques are becoming extremely important. The Pass-Transistor Logic (PTL) is a better way to implement circuits designed for low power applications. As the technology is growing pass transistor logic has gained the prominent importance. In this design of 1 bit ALU, PTL technology has been deliberately implemented. The Boolean equations have been modified in order to reduce the transistor count, and also reuse of hardware has also been achieved. © 2015 IEEE. Source

Kumar M.A.,Chiranjeevi Reddy Institute of Engineering and Technology | Reddy G.R.,Sri Krishnadevaraya University | Rao H.R.,G Pulla Reddy Engineering College | Reddy K.H.,Jawaharlal Nehru Technological University Anantapur | Reddy B.H.N.,Amrita University
International Journal of Polymeric Materials and Polymeric Biomaterials | Year: 2012

Glass fibers/drumstick fruit fibers (GF/DFF) reinforced with epoxy hybrid composites were fabricated using the rule of hybrid mixtures. Properties like impact strength, frictional coefficient, dielectric strength, and chemical resistance were studied. Treated and untreated DFF were reinforced along with GF to assess two different epoxy hybrid composites. The effect of alkali treatment on the above-mentioned properties was also studied. It is observed that the impact strength and frictional coefficient properties of the hybrid composites increased with increase in glass fiber content. Performance was elevated for alkali-treated DFF hybrid composites when compared with untreated DFF. Chemical resistance was significantly increased for all chemicals except carbon tetrachloride due to attack of chloride hydrocarbons on the cross-linking of the epoxy. Elimination of amorphous hemi-cellulose by alkali treatment improved the properties. Fiber-polymer interactions were studied by scanning electron microscopy on the cross-sections of fractured surfaces. © 2012 Taylor and Francis Group, LLC. Source

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