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Kalaiselvi D.,Jay Shriram Group of Institutions | Radhakrishnan R.,Coimbatore Institute of Technology
Mathematical Problems in Engineering | Year: 2015

This paper presents a multiconstrained quality-of-service routing (QoSR) based on a differentially guided krill herd (DGKH) algorithm in mobile ad hoc networks (MANETs). QoSR is a NP-complete and significant problem with immense challenges in determining an optimum path that simultaneously satisfies various constraints in MANETs, where the topology varies constantly. Various heuristic algorithms are widely used to solve this problem with compromise on excessive computational complexities and/or low performance. This paper proposes a krill herd based algorithm called DGKH, where the krill individuals do not update the position in comparison with one-to-one (as usual), but instead it uses the information from various krill individuals and then searches to determine a feasible path. Experiment results on MANETs with different number nodes (routes) are considered with three constraints which are maximum allowed delay, maximum allowed jitter, and minimum requested bandwidth. It is demonstrated that the proposed DGKH algorithm is an effective approximation algorithm exhibiting satisfactory performance than the KHA and existing algorithms in the literature by determining an optimum path that satisfies more than one QoS constraint in MANETs. Copyright © 2015 D. Kalaiselvi and R. Radhakrishnan. Source


Due to rise of the load demand, the Renewable Energy Sources (RES) are linked with the transmission system using power electronic converters and other devices. In recent years, Active Power Filter (APF) has become an active area of research due to its significant harmonic compensation. However, there is always a scope for betterment in the performance of the active filter which appears to be inconsistence with various control approaches. This paper presents active and reactive current method (id - iq) control strategy for extracting reference currents of shunt active filters under un-balanced and non linear load conditions. This (id - iq) control strategy is used in this approach for attaining utmost profit from grid-interfacing inverters installed in transmission systems. The inverter used in this approach can be considered as a Shunt Active Power Filter (SAPF) to compensate unbalanced and non linear load current harmonics. In order to improve the overall performance of the system, Space Vector Pulse Width Modulation (SVPWM) is used in this proposed approach which is regulates power frequency and produces good circularity through DC-AC part. The output of the (id - iq) control strategy is given as input to the SVPWM. This research work proposes the integration of (id - iq) control strategy and SVPWM. According to this proposed control strategy, the integration of grid-interfacing inverter and unbalanced non-linear load at point of common coupling seems to be balanced linear load. The experimental results are carried out in MATLAB/Simulink and the performance of the proposed approach is compared with other control strategies. © 2013 Praise Worthy Prize S.r.l. - All rights reserved. Source


Saravanan P.,Jay Shriram Group of Institutions | Balakrishnan P.A.,Bharathiyar Institute of Engineering for Women
WSEAS Transactions on Power Systems | Year: 2014

In recent decades, the utilization of highly automatic electric equipments has resulted in enormous economic loss. Thus, the power suppliers as well as the power consumers are very much concerned about the power quality issues and compensation approaches. In order to deal with this issue, Active Power Filter (APF) has been considered as an attractive solution due to its significant harmonic compensation. But, the performance of APF is not consistent and is varies based on the output of the controller techniques. This research work mainly focuses on using an efficient control strategy for extracting reference currents of shunt active filters under non linear load conditions. An efficient (id - iq) control strategy is used in this approach for attaining utmost profit from grid-interfacing inverters installed in transmission systems. The voltages are controlled through the PI controller which is further tuned by an optimization approach. Bacterial Forge Optimization (BFO) is used in this approach for tuning the PI controller for the optimal value. The inverter used in this approach can be considered as a Shunt Active Power Filter (SAPF) to compensate non linear load current harmonics. In order to improve the overall performance of the system, Space Vector Pulse Width Modulation (SVPWM) is used in this proposed approach which regulates power frequency and produces good circularity through DC-AC part. SVPWM also eliminates the 3rd order harmonics and minimizes the 5th order harmonics effectively. The integration of (id - iq) control strategy and SVPWM has been proposed in this research work. Simulation results are carried out in MATLAB/Simulink and the performance of the proposed approach is compared with other control strategies. This research works shows unique approach for attaining maximum benefits from RES with suppression of current harmonics. Source


Saravanan P.,Jay Shriram Group of Institutions | Balakrishnan P.A.,Bharathiyar Institute of Engineering for Women
Research Journal of Applied Sciences, Engineering and Technology | Year: 2014

This research study mainly focuses on using an efficient control strategy for extracting reference currents of shunt active filters under non linear load conditions. In recent decades, the utilization of highly automatic electric equipments has resulted in enormous economic loss. Thus, the power suppliers as well as the power consumers are very much concerned about the power quality issues and compensation approaches. In order to deal with this issue, Active Power Filter (APF) has been considered as an attractive solution due to its significant harmonic compensation. But, the performance of APF is not consistent and is varies based on the output of the controller techniques. An efficient (iq - iq) control strategy is used in this approach for attaining utmost profit from grid-interfacing inverters installed in transmission systems. The voltages are controlled through the PI controller which is further tuned by an optimization approach. Bacterial Forge Optimization (BFO) is used in this approach for tuning the PI controller for the optimal value. The inverter used in this approach can be considered as a Shunt Active Power Filter (SAPF) to compensate non linear load current harmonics. In order to improve the overall performance of the system, Space Vector Pulse Width Modulation (SVPWM) is used in this proposed approach which regulates power frequency and produces good circularity through DC-AC part. SVPWM also eliminates the 3rd order harmonics and minimizes the 5th order harmonics effectively. The integration of (iq - iq) control strategy and SVPWM has been proposed in this research study. Simulation results are carried out in MATLAB/Simulink and the performance of the proposed approach is compared with other control strategies. This research studies shows unique approach for attaining maximum benefits from RES with suppression of current harmonics. © Maxwell Scientific Organization, 2014. Source


Maguteeswaran R.,Jay Shriram Group of Institutions | Sivasubramanian R.,Coimbatore Institute of Technology | Suresh V.,Jay Shriram Group of Institutions
International Review of Mechanical Engineering | Year: 2012

Metal matrix composites are emerging as very promising materials especially in the fields of aerospace, electrical, electronics and automotive for there various applications and technical demanding properties. The [Fe3O4] iron oxide is reinforced in the aluminum matrix composites to increase the more conductivity and characterized for there mechanical properties such as hardness and tensile strength. LM25aluminum alloy metal matrix composites (MMCs) reinforced with iron oxide [Fe3O4] particles up to 11 wt % was produced by stir casting. © 2012 Praise Worthy Prize S.r.l. - All rights reserved. Source

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