IJEA - Volume 6 Issue 5 (May 2017)

 


Sr/No/ Title Pdf
1 Modeling and Performance Investigation of Diffuser Augmented Wind Turbine
Navin kumar, Punam Kumar Agade, Surendra Agrawal

Abstract- Electricity is essential for all households irrespective of their geographical location. Its demand is increasing day by day due to the rapid population growth and greater use of electricity for better standard of living. Wind energy conversion systems have been attracting wide attention as a renewable energy source due to depleting fossil fuel reserves and environmental concerns as a direct consequence of using fossil fuel and nuclear energy sources. Wind turbines are one type of renewable resource that is very usual in the offshore site has a stronger and steadier wind speed which can produce more energy. It is a common practice to place wind turbines on ridges and hills to increase wind velocity over that of free stream. If a device (shroud) can be added to a bare turbine to increase wind velocity just as our research was to add shrouds by means of computer simulations to encase the “bare turbine” thereby increasing efficiency. Our goal is to find a particular shroud that maximized air mass flow through the turbine beyond the best bare turbine operational conditions. In this analysis we have used CFD (Computational fluid dynamics) software 15.0 five case studies have been analyzed viz. (i) simulation of simple bare turbine (ii) 10 degree diffuser augmented wind turbine (iii) 20 degree diffuser augmented wind turbine (iv) 30 degree diffuser augmented wind turbine (v) 40 degree diffuser augmented wind turbine. The results reveals that at 20 degree diffuser augmented wind turbine the maximum shaft power = 2.17 KW is achieved with the following conditions: average velocity inlet = 16.54 m/s, average velocity outlet = 6.91 m/s, area inlet = 1.35 m2, area outlet = 2.28 m2. We also noticed with increase in further value of THETA the beginning of a downward trend in power occurs.

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2 Power optimization back-to-back dual- input single output differential amplifier based digital comparator with better Noise Response and Higher Speed
Deepika Soni, KarishmaSahu

Abstract- This paper presents a power optimizedCMOS dynamic comparator using dual input single output with latch stage differential amplifier suitable for high speed ADC converters work also focus on High Speed, low power dissipation and immune to noise than the previous reported work. dual-input single output differential amplifier is added in place of back- to-back inverter in the latch stage. The proposed topology completely remove the noise present in the input. The structure shows lower power dissipation and higher speed than the conventional comparators. The circuit is simulated with 0.8Vsupply voltage and 250 MHz clock frequency. The proposed topology is based on double cross coupled differential pairs switchable current sources and positive feedback, which has a lower power dissipation, less area,higher speed, and it is shown to be very robust against noise immunity, transistor mismatch. Previous reported comparators are designed and simulated their DC response and Transient response in Tanner EDA using 45nm technology. Layouts of the proposed comparator have been done in Tanner EDA Tool

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3 Single Point Incremental Sheet Metal Forming- A Review
Rahul Pachori, Naveen Agrwal

Abstract- Incremental sheet metal forming is a new method, which consists of improved possibilities of sheet metal forming. Now days, incremental sheet metal forming has become very attractive method for making 3-D complex shapes. The main advantage of this process is the cost and time reduction by eliminating the making of special purpose dies. With the controlled movement of a tool; wide range of 3D shapes can be formed directly from the CAD model by moving the tool along an optimized path. This process is suitable for small batch production as well as to fabricate complex geometries.

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4 Study of Low Power Arithmetic and Logical unit (ALU) using Novel Full Adder and Pass Transistor logic based Multiplexer- A Review
Shalini Tiwari, Neha Verma

Abstract- An Optimized compensation strategy for two-stage CMOS OTA has been proposed for a high frequency OPAMP design. Here, the slew rate and bandwidth has been increased by employing thin and long transistors into the design at output stage and wide transistors in input stage. These two techniques are able to increase the gain up to a great extent by increasing the output resistance and input trans-conductance respectively. There is a slight increase in static power dissipation of proposed architecture, but, the overall advantage of increased slew rate and gain bandwidth product which is very important parameter of communication so it compensates for this limitation.

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5 Pareto Analysis of Centrifugal Oil Cleaner
D.P.Patil, N.V.Hargude, Nutan Raut, A.R.Dandekar

Abstract- Pareto analysis is basically a problem solver tool which is very useful in the decision making. It also decides the effective course of action which is to be implemented while taking any decision. The application of Pareto analysis allows management of the organization to concentrate on those aspects that have most impact on the project.

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6 Simulation of Push–Pull Quasi-Resonant Boost Power Factor Corrector
A.Sridhar, M. Narendar Reddy, G.Laxmi narayana

Abstract- Power-factor corrector (PFC), which is mainly composed of two phase transition- mode (TM) boost-type powerfactor correctors (PFCs) and a coupled inductor. By integrating two boost inductors into one magnetic core, not only the circuit volume is reduced, but also the operating frequency of the core is double of the switching frequency. Therefore, both the powerfactor value and the power density are increased. A cut-in half duty cycle can reduce the conduction losses of the switches and both the turns and diameters of the inductor windings. The advantages of a TM boost PFC, such as quasi-resonant (QR) valley switching on the switch and zero-current switching (ZCS) of the output diode, are maintained to improve the overall conversion efficiency.

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7 A Unified Control Strategy with neutral point clamped for Three Phase Inverter in DG system
Thotakoora.Parsha ramulu, M. Narendar Reddy, G.Laxmi narayana

Abstract- A neutral point clamped technique based threephase inverter with grid connected system that operates in both islanded and grid-tied modes. This paper presents the detailed analysis and the parameter design of the control strategy. The 3-phase inverter in the DG system doesn’t needs any switching between two controllers for the operation. The new proposed control strategy having two loops 1) inner inductor current loop, and 2) a voltage loop in the synchronous reference frame. The inner current loop is used to regulate the inverter as a current source in grid-tied operation. In the islanding mode the voltage controller is automatically controls the load voltage. To check the effectiveness of the proposed system, the waveforms of the grid current and the load voltage are distorted under nonlinear load with the conventional strategy. These issues are addressed by proposing a neutral point clamped (NPC) technique in this paper. The effectiveness of the proposed control strategy is verified by the simulation results using MATLAB/SIMULINK software.

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8 Integration of DC Micro-grid With Wind Power and Wave Power using fuzzy controller for Generation Systems
S.Srinivas, M. Narendar Reddy, G.Laxmi narayana

Abstract- In recent years, renewable energy and distributed generation systems (DGSs) have attracted increasing attention and have been extensively researched and developed. They gradually alter the concepts and operations of conventional power generation systems. The rise in several countries makes it possible that this kind of DGS can be practically applied to a grid-tied system or an isolated system with wind power, solar energy, hydropower, etc. The output of DGS usually includes two kinds: dc and variable ac. Moreover, the generating capacity of DGS comparing with conventional large synchronous generators is much smaller, and hence, the dc micro-grid can be practically applied to convert the generated time-varying quantities of natural renewable energy and DGS into smooth dc electricity that can then be converted back into ac quantities delivered to other power systems. In order to study the uncertainty and intermittent characteristics of wind power and wave power, this paper proposes an integrated wind and wave power generation system fed to an ac power grid or connected with an isolated load using a dc micro grid. The studied integrated wind and wave system joined with the dc micro grid is modeled and simulated using the written program based on MATLAB Simulink. Root-loci plots of the studied system under various speeds of the wave generator are analyzed.

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9 Speed control of Doubly Fed Induction Machine with DTC
G.Isaac

Abstract- Doubly Fed Induction Machine (DFIM) based wind turbines. In addition to that a Direct Torque Control (DTC) strategy that provides fast dynamic response accompanies the overall control of the wind turbine. It is specially designed to address perturbations, such as voltage dips, keeping controlled the torque of the wind turbine, considerably reducing the stator and rotor over currents during faults. Despite the fact that the proposed control does not totally eliminate the necessity of the typical crowbar protection for this kind of turbines, it eliminates the activation of this protection during low depth voltage dips.

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10 Improve the Performance of high efficient and reliable single phase transformer less inverter for Grid connected PV systems
G.Isaac

Abstract- The PV inverter with transformer is having efficiency around 92%–94% only. To overcome these problems, transformer less PV system is introduced. It is smaller, lighter, cheaper and higher in efficiency. However, dangerous leakage current will flow between PV array and the grid due to the stray capacitance. There are different types of configurations available for transformer less inverters like H5, H6, HERIC, oH5, and Dual paralleled buck inverter. But each configuration is suffering from its own disadvantages like high conduction losses, shootthrough issues of switches, dead-time requirements at zero crossing instants of grid voltage to avoid grid shoot-through faults and MOSFET reverse recovery issues. The main objective of the proposed transformer less inverter is to address two key issues: One key issue for a transformer less inverter is that it is necessary to achieve high efficiency compared to other existing inverter topologies. Another key issue is that the inverter configuration should not have any shoot-through issues for higher reliability.

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