JCT - Volume 7 Issue 12 (December 2018)

 


Sr/No/ Title Pdf
1 Simulation of Optimal Harvesting of Three Species Ecological Model With Closed Interval of Biological Parameter Using By First Order Nonlinear Ordinary Differential
Tadesse Lamessa Edae 1*,Selashi Dabi 2*

ABSTRACT - The paper presents the study of three species ecological model with Prey N1, predator N2 and competitor to the Predator N3 and neutral with the predator N2 with imprecise biological parameters. The model is characterized by a set of first order nonlinear ordinary differential equations. Due to the lack of precise numerical information of the biological parameters such as prey population growth rate, predator population decay rate and predation coefficients, we consider the model with imprecise data as form of an interval in nature. Many authors have studied prey–predator harvesting model in different form, here we consider a simple prey–predator model under impreciseness and introduce parametric functional form of an interval and then study the model. Equilibrium points of the model are identified, the local stability is discussed using Routh - Hurwitz criteria and global stability by Liapunov function. The existence of bionomic equilibrium of the system has been discussed and optimal harvesting policy is given using Pontryagin’s maximum principle. The stability analysis is supported by Numerical simulation using Mat lab.
Keywords - Prey; Predator; Competitor to the predator; Equilibrium points; interval number, Stability of the equilibrium points; Bionomic Equilibrium; Optimal harvesting policy; Pontryagin’s maximum principle; Numerical simulation using mat lab. .
Page No. 01 - 15 .

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2 Performance Analysis of Point-to-Point Bipolar VSC-HVDC System
Chandraprakash and Abhay Chaturvedi

ABSTRACT -Power electronics play major role in development of power transmission in HVDC. For developing country it required to transmit bulk power. Transmission of bulk power over long and inter country lines has been seriously limited by system stability. Moreover, due to deregulated power market and large amount of decentralized generation in a meshed AC grid, an existing power system is becoming more complex. These limitations are triggering all sorts of problems and reliability issues in power systems. This can be done by the implementation of HVDC. The presence of multilevel converter technology the power rating gets higher to higher. This paper presents the Point-to-Point Bipolar VSC-HVDC with multilevel converter based system. Here in this paper discuss three level NPC converter topology for VSC converter for transmission of high power through HVDC line. A local fault is generated and checks the transient stability of the proposed system. The whole work is simulating in the MATLAB software for verification of system.
Keywords— MMC, NPC, HVDC, VSC, Active and Reactive power, P-Q theory etc.
Page No. 16 -21 .
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3 Analysis of Grid Tied PV/Fuel Cell based Hybrid Power System
Saddam Hussain and Abhay Chaturvedi

ABSTRACT -A lot of research has been carried out to make renewable resources more efficient and easier to use. The use of photovoltaic cells and fuel cells in the last few days has been one of the greatest researches. This paper provides an implementation of photovoltaic energy system with fuel cell for energy supply in the utility grid. For controlling the energy of both sources a control method is also proposed in this paper. This technique can be applied in the future for independent renewable energy integration. In this proposed work hybrid power system, consisting of a PV cell and the Proton Exchange Membrane Fuel Cell (PEMFC), is the most efficient combination of renewable energy sources. The whole work is simulated in MATLAB/SIMULINK environment to validate the mode. The result is discussed with variable loading condition in this paper.
Keywords— Keywords— PV, FC, Wind Energy, RES, HES EMS, etc.
Page No. 22-29 .
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4 Speed Control of Asynchronous Motor Using Space Vector PWM Technique
Piyush, Jyotsna Sagar

ABSTRACT -Working with the subject of Space vector control of motor requires an understanding of several topical areas , this report presents an understanding that was gained during this thesis work. The fundamentals of electric motors (particularly induction motors) are developed from first principles and the basic models are discussed. The theory of sinusoidal synchronous motors is reviewed. The concept of a complex space vector is introduced and developed using a working knowledge of the sinusoidal asynchronous motor. An overview of the operation of three-phase voltage source inverters is given, followed by an explanation of space vector modulation and its relationship to regular sinusoidal pulse width modulation. Torque control of the asynchronous machine is reviewed in several reference frames and then rotor-flux-field-oriented-control is explained. Finally, some schemes for space vector control operation are discussed.
Keywords— Two Level Inverter Multilevel inverter, Pulse Width Modulation (PWM), Induction Motor (IM)
Page No. 01-08
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5 An OFDM based PAPR Reduction in Wireless Communication System
Shankar Prshad and Prof. Devendra Patle

ABSTRACT - Orthogonal Frequency division multiplexing OFDM has emerged has a key enabler in high speed digital communication. It has found its applications in LTE, WLANs, WI Max systems etc. It is by far better than FD multiplexed type of technique from the efficacy point of aspect. PAPR as it one may see is the major type of challenge apparent due to very intrinsic way of the OFDM symbol addition. Due to high PAPR obtaining, one may not be able in developing the structured amplifier piecewise linear region which causes distortions in the capacity of non-linearity while reaching the end receiver. Non linear distortions result in high bit error rate or BER of the system. This in turn divulges the system in poor Quos type conditions and yielded the undesirable and detrimental effects in OFDM, PAPR plummeting methods often regarded effective for PAPR plummeted values are resorted to. Out of several PAPR reduction techniques, Selective Mapping is one of the most potent techniques with high PAPR reduction capability. In the proposed technique, a weighted selective mapping technique is proposed with windowed weighting unction used for peak cancellation. In the proposed work, original OFDM, clopping, selective sort of phase mapping (SLM) with a functional weight incurred mapping W-SLM) are analyzed using the (CCDF). It is outrageously visible to observant that the system outperforms the conventional Selective Mapping by far. The proposed system attains a PAPR of 13 dB lesser than the conventional SLM at a PAPR of 10-1 and 10-2, which is a substantial reduction in PAPR.
Keywords— Orthogonal Frequency Division Multiplexing (OFDM), Peak to Average Power Ratio (PAPR), Bit Error Rate (BER), Selective Mapping (SLM),
Page No. 01-06
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