Madireddy R.M.,Pragati Engineering College |
Gottumukkala P.S.V.,SRKR Engineering College |
Murthy P.D.,Jawaharlal Nehru Technological University Kakinada |
Chittipothula S.,Jawaharlal Nehru Technological University Kakinada
Cellular and Molecular Life Sciences | Year: 2014
The complexity in shape context method and its simplification is addressed. A novel, but simple approach to design shape context method including Fourier Transform for the object recognition is described. Relevance of shape context, an important descriptor for the recognition process is detailed. Inclusion of information regarding all the contour points (with respect to a reference point) in computing the distribution is discussed. Role of similarity checking the procedure details regarding the computation of matching errors through the alignment transform are discussed. Present case of shape context (for each point with respect to the centroid) descriptor is testified for its invariance to translation, rotation and scaling operations. Euclidean distance is used during the similarity matching. Modified shape context based descriptor is experimented over three standard databases. The results evidence the relative efficiency of the modified shape context based descriptor than that reported for other descriptor of concurrent interests. © 2014 Madireddy et al.; licensee Springer.
Naresh G.,Pragati Engineering College |
Narasimham S.V.L.,JNTUH College of Engineering |
Ravindra K.,Jawaharlal Nehru Technological University Kakinada
International Review on Modelling and Simulations | Year: 2011
Power system stabilizers (PSSs) are used to generate supplementary control signals for the excitation system to damp electromechanical oscillations. This paper presents a particle swarm optimization based approach for tuning the parameters of PSSs in multi-machine power systems. The stabilizers are tuned to simultaneously shift the undamped and lightly damped electromechanical modes of all plants to a prescribed zone in the s-plane. A multiobjective problem is formulated to optimize a composite set of objective functions comprising the damping factor and the damping ratio of lightly damped electromechanical modes. The performance of the proposed PSSs under different disturbances, loading conditions, and system configurations is investigated on two multi-machine power systems. The non-linear simulation results are presented under wide range of operating conditions; disturbances at different locations show the effectiveness and robustness of the proposed PSSs and their ability to provide efficient damping of low frequency oscillations. © 2011 Praise Worthy Prize S.r.l. - All rights reserved.
Murali M.R.V.,Sasi Institute of Technology and Engineering |
Srinivasu K.,Pragati Engineering College |
Narasimha Rao L.V.,Sasi Institute of Technology and Engineering
2016 - Biennial International Conference on Power and Energy Systems: Towards Sustainable Energy, PESTSE 2016 | Year: 2016
Nowadays one of major power system problems is inadequacy of Power Quality (PQ) due to increased use of nonlinear loads and power electronic devices in industries. In this paper, Distributed STATCOM is proposed with Four-leg inverter to compensate the neutral current, harmonics and load balancing under unbalanced load conditions and nonlinear load in Distributed system. For controlling of four leg DSTATCOM instantaneous reactive power (IRP) theory is proposed. For DC link voltage regulation of DSTATCOM optimized PI controller and Adaptive Neuro Fuzzy Inferences System (ANFIS) controller are used. Comparison with ANFIS controlled DSTATCOM with Traditional conventional methods also investigates in this paper. The performance of proposed modeled is analyzed with MATLAB/SIMULINK Software. © 2016 IEEE.
Naresh G.,Pragati Engineering College |
Ramalinga Raju M.,Andhra University |
Narasimham S.V.L.,JNTUH College of Engineering
Swarm and Evolutionary Computation | Year: 2016
Power System Stabilizers (PSS) are generally employed to damp electromechanical oscillations by providing auxiliary stabilizing signals to the excitation system of the generators. But it has been found that these Conventional PSS (CPSS) do not provide sufficient damping for inter-area oscillations in multi-machine power systems. Thyristor Controlled Series Capacitor (TCSC) has immense potential in damping of inter-area power swings and in mitigating the sub-synchronous resonance. In this paper Improved Harmony Search Algorithm (IHSA) has been proposed for coordinated design of multiple PSS and TCSC in order to effectively damp the oscillations. The results obtained by using IHSA on WSCC 3-machine, 9-bus system are found to be superior compared to the results obtained using Bacterial Swarm Optimization (BSO) algorithm. The damping performance of conventional PSS and TCSC controllers is also compared with coordinated design of IHSA based PSS and TCSC on New England 10-machine, 39-bus system over wide range of operating conditions and contingencies. To demonstrate the effectiveness of the proposed technique the results obtained on this test system are also compared with the results obtained with Genetic Algorithm (GA), Particle Swarm Optimization (PSO), Harmony Search Algorithm (HSA) and Bacterial Swarm Optimization (BSO). © 2015 Elsevier B.V. All rights reserved.
Sirisha D.,Pragati Engineering College |
Vijayakumari G.,JNTUH College of Engineering
Procedia Computer Science | Year: 2016
Computationally complex applications featuring workflows comprises of modules that can be deployed on Heterogeneous Computing Systems (HCS) for accomplishing high performance. The problem of scheduling the workflows on HCS is proven to be NP-Complete. In the present work, Branch and Bound (B&B) strategy for scheduling the workflows on HCS is proposed to attain globally optimal solutions. The primary merit of the proposed strategy is due to the estimation of the rank functions which are sharper and not complex. The proposed B&B strategy expands the most promising states first. The sharper ranks aid in converging to the solution quickly by pruning the unpromising states which do not lead to an optimal solution. Therefore, the search space is drastically reduced hence higher performance can be expected. The experimental results reveal that the proposed B&B scheme is efficient in exploring high potentials of B&B strategy in finding exact solutions. The performance analysis on a set of benchmark workflows shows that the proposed B&B strategy has generated optimal schedules for 94.37% of the cases. © 2016 The Authors. Published by Elsevier B.V.
Sirisha D.,Pragati Engineering College |
Vijayakumari G.,JNTUH College of Engineering
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2016
Heterogeneous computing systems require efficient task-to-processor mapping for attaining high performance. Scheduling workflows on heterogeneous environments is shown to be NP-Complete. Several heuristics were developed to attain minimum schedule lengths. However, these algorithms employ level-wise approach of scheduling tasks. This indirectly assigns higher priority to the tasks at lower levels than those at higher levels. Further, the start time of tasks at higher levels is constrained by the completion times of tasks at lower levels. The present work proposes a novel heuristic based global scheduling algorithm namely Minimal Start Time (MST) algorithm for work- flows. The proposed approach focuses on minimizing the start times of tasks which are dependent on the tasks at lower levels to generate shorter span schedules. The primary merit of this scheme is due to the elimination of level constraints whenever there are no dependency constraints. The performance of MST algorithm is evaluated in terms of normalized makespan, speedup, efficiency and improvement of 5–20% in 80% of the cases is achieved in comparison to the earlier work. © Springer International Publishing Switzerland 2016.
Lakshmi N.,Pragati Engineering College
International Journal of Applied Environmental Sciences | Year: 2013
The present study deals with the effect of lead (Pb+2) on seed germination on groundnut (Arachis hypogea L. Var TMV-2) in solution as well as pot experimental studies. Three test concentrations of lead (Pb+2)10.2ppm, 102ppm, 1020ppm are taken in a solution as well as a pot (soil) culture besides a test control to grow the groundnut species. Effect of lead in germination success and seedling characteristics were studied in test species grown in above test concentrations of lead, besides control. © Research India Publications.
Tiwari R.,Pragati Engineering College |
Mishra A.K.,Pragati Engineering College
Proceedings of the 2014 IEEE 2nd International Conference on Electrical Energy Systems, ICEES 2014 | Year: 2014
The Large scale development of wind farm brings complexity in the electrical grid because it is intermittent in nature. Traditionally, the grid operators are habituated of maintaining the supply with respect to the demand and balancing the grid. For handling the complexity of wind farm integration to the grid communication system technology is need to be focused that enables the accommodation of wind energy generation along with monitoring, operating, and protecting the grid. In this paper, communication technology are reviewed. One of the potential area of further improvement in real time data transmission system undertaking with real time example. The present communication system provides its benefit to the data transfer in SLDC and some of the utility side such as GETCO are reviewed. Finally, the outline the cost analysis and possible solution for wind farm communication system development. © 2014 IEEE.
Sirisha D.,Pragati Engineering College
IET Conference Publications | Year: 2013
Computationally intensive applications may be efficiently solved by decomposing the problem into several tasks that can be executed in parallel. High Performance can be achieved by scheduling such applications on Heterogeneous Distributed Computing Systems. The problem of task scheduling in HDCS has been proved to be NP-complete and heuristics are generally used to obtain near optimal solution. In this paper a novel heuristic approach based on slack namely, Slack based Task Scheduling (STS) is proposed. The proposed heuristic first generates the schedule by ordering the execution of the tasks. Then the algorithm shortens the schedule length by inserting the tasks into the slack that is created by delaying some tasks. By efficiently utilizing the slack of a task, shorter span schedules can be generated and performance can also be enhanced. The STS algorithm's performance analysed and compared with the well known HEFT and PETS algorithms. The experimental results reveal that STS algorithm's performance is better PETS and HEFT algorithms in terms of schedule length ratio, speedup and efficiency.
Satyanarayana K.,Pragati Engineering College |
Surekha P.,Pragati Engineering College |
Vijaya Prasuna P.,Pragati Engineering College
International Journal of Power Electronics and Drive Systems | Year: 2013
This paper presents a New FOC Approach of Induction Motor Drive using DTC Strategy for the Minimization of CMV (common mode voltage) with the switching tables for the generation of PWM signals. High performance induction motor drives require a better transient and steady state performance. To achieve high performance, there are two control strategies namely, field oriented control (FOC) and direct torque control (DTC) for induction motor drives. Though these two methods give better transient performance, the FOC needs reference frame transformations and DTC gives large steady state ripples. To overcome these drawbacks, this paper presents a novel FOC algorithm for induction motor drives, which combines the principles of both FOC and DTC. The proposed method uses a predetermined switching table instead of a much more time consuming pulse width modulation (PWM) procedure. This approach gives a quick torque response like DTC and gives reduced ripple like FOC. The switching table is based on the conventional DTC principle, which gives good performance with reduced common mode voltage variations. To validate the proposed method numerical simulations have been carried out and compared with the existing algorithms. The simulation results confirm the effectiveness of the proposed method. © 2012 Institute of Advanced Engineering and Science. All rights reserved.