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Ramana T.,HP Global Soft Ltd | Sivanagaraju S.,Andhra University
International Journal of Electrical Power and Energy Systems | Year: 2014

This paper focuses on providing a new and comprehensive optimization algorithm to solve constrained Optimal Power Flow (OPF) problem in the power system. Unlike the OPF solution algorithms existing in the literature, in the proposed algorithm, a two stage initialization process is adopted and the mutation operation is not used. Also, it gives optimal solution with less number of generations which results in the reduction of the computation time. The feasibility of the proposed algorithm is demonstrated for a Himmelblau function and IEEE 14 bus system. The obtained results using proposed method are compared with the existing optimization techniques. The results reveal better solution and computational efficiency of the proposed algorithm. © 2013 Elsevier Ltd. All rights reserved.


Nagaraju K.,SSN College of Engineering | Sivanagaraju S.,JNTUH College of Engineering | Ramana T.,HP Global Soft Ltd | Ganesh V.,Jawaharlal Nehru Technological University Anantapur
Distributed Generation and Alternative Energy Journal | Year: 2012

This article presents a methodology for optimal placement of DG units in distribution networks to guarantee the enhancement of voltage profile, maximize loadability and reduce distribution system losses. The methodology aims to find the configuration, among a set of system components, which meets the desired system reliability requirements, taking into account the stability limits. Results shown in the article indicate that the proposed formulations can be used to determine which are the best buses, where the addition of small distributed generator units can greatly enhance the voltage stability of the whole system and improve power transfer capability by reducing the system power losses. The proposed methodology is tested and compared with the existing distribution system.


Nagaraju K.,SSN College of Engineering | Sivanagaraju S.,JNTUH College of Engineering | Ramana T.,HP Global Soft Ltd | Prasad P.V.,CBIT
International Journal of Power and Energy Systems | Year: 2011

The need of fast load flow algorithms for radial distribution networks that take advantage of their particular structure has been increasing for the planning and optimization. In this paper, a novel load flow method of radial distribution systems (RDSs) is presented. In the proposed method, different realistic loads have been considered, as loads are voltage dependent in distribution systems. The effect of load growth is investigated with the proposed method as it is required for system expansion, planning and operation. The proposed method has good convergence pattern and execution time for all type of realistic loads and size of the networks. The efficacy of the proposed method is tested with different RDS and compared with other existing methods.


Babu A.V.N.,DVR and Dr. HS MIC CT | Sivanagaraju S.,JNTUH College of Engineering | Ramana T.,HP Global Soft Ltd
International Journal of Power and Energy Systems | Year: 2012

Power flow analysis is of great importance in planning and designing for the future expansion of power systems as well as in determining the best operation of existing systems. Although the standard Newton-RaphsonNR) method is the most powerful algorithm for he power flow analysis in electric power systems, the calculation f jacobian matrix derivatives involves high computational time. This paper presents a simplified NR power flow solution method to simplify overall equation complexity and computation time. The implified NR method employs nonlinear current mismatch equations instead of the commonly used power mismatch equations. Numerical results are carried out on a standard 5-bus test system, IEEE 30-bus test system and IEEE 57-bus test system. The results of standard NR method and simplified NR method are compared in terms of bus voltages, total system losses, computation time and convergence characteristics to show the effectiveness of simplified NR method.


Nagaraju K.,SSN College of Engineering | Sivanagaraju S.,JNTUH College of Engineering | Ramana T.,HP Global Soft Ltd | Ganesh V.,SSN College of Engineering
International Journal on Electrical Engineering and Informatics | Year: 2012

This paper presents a heuristic approach for optimal feeder reconfiguration of radial distribution systems (RDS). Optimal feeder reconfiguration involves the selection of the best set of branches to be opened by considering the all tie switches, such that the resulting RDS has the desired performance. Amongst the several performance criteria considered for optimal feeder reconfiguration, line maximizing loadability is an important one. In this paper an algorithm is proposed based on simple heuristic rules and identified an effective switch status configuration of distribution system for maximizing the line maximum loadability of the system. The line maximum loadability, power loss and voltage profile calculation of the best switching combination are found by load flow solution. Compared to other published articles, the proposed method reduces the switching combinations searched and gives the optimum solution in few number of load flow runs. To demonstrate the validity of the proposed algorithm, computer simulations are carried out on 33-bus system and the performance of the proposed method compared with the other existing methods.


Ramana T.,HP Global Soft Ltd | Ganesh V.,JNTUCE | Sivanagaraju S.,JNTUCE
International Journal on Electrical Engineering and Informatics | Year: 2013

The proposal of this paper is on a simple and fast distribution load flow solution algorithm. The proposed method fully exploits the radial structure of the network and solves the distribution load flow directly using the single dimension vectors. An effective data structure is proposed to identify lines and number of lines available beyond the particular line. Using this concept, power summations are calculated to obtain the distribution load flow solution. Unlike other traditional methods, the proposed method consider the effective convergence approach which is not only simple and fast but also is efficient from time perspective and needs very less memory for any size of the distribution system compared with the existing methods. The proposed concept was tested on standard distribution system and results are promising and have great potential for applications in the distribution automation.

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