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Motion Estimation Algorithms in H.264 Video Codec full Paper

Motion Estimation Algorithms in H.264 Video Codec full Paper presentation
Abstract:  Motion estimation is most time consuming part of the H.264 encoder. Block-matching motion estimation is vital to many motion compensated video coding techniques, which is aimed to exploit the strong temporal redundancy between successive frames. However, the motion estimation is quite computational intensive and can consume up to 80% of the computational power of the encoder if the full search is used by exhaustively evaluating all possible candidate blocks within a search window. Therefore, fast search algorithms are highly desired to significantly speed up the process without sacrificing the distortion seriously.  The major motivation behind this project is to improve the existing H.264 codec by reducing the complexity in the parameters like speed and bandwidth. The block matching algorithms have most of the impact on the encoder performance, and hence the key idea here is that if  the proposed algorithm improves bandwidth or speed then we can easily integrate that into well known H.264 codec, which is used by huge number of the applications.

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Ultracapacitors Paper presentation full

 Ultracapacitors Seminar Paper presentation full download doc
Abstract: Ultracapacitors are unique energy storage devices that exhibit very high power densities and exceptionally long life. Maxwell Technologies ultracapacitors are used in over 20,000 wind turbines globally.
This presentation will provide an overview of ultracapacitor technology, and show how ultracapacitors can be used for back-up power in electromechanical pitch control systems. Ultracapacitors will be compared and contrasted to batteries as the back-up power source. Finally, the financial aspects for business case development comparing ultracapacitors and batteries will be examined and compared.

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A SOFTWARE HARDWARE COOPERATIVE IMPLEMENTATION OF BIRD’S-EYE VIEW FOR CAMERA-ON-VEHICLE

Abstract: Rear camera or other wide-angle camera mounted on vehicle has serious perspective effect which makes driver unable to feel distance correctly and is  not helpful for succeeding image analysis. To remove perspective effect, it’s necessary to change diagonal view to bird’s-eye view. In this paper, a software-hardware cooperative bird’s-eye view system is proposed, which can estimates the transformation matrix and changes the view automatically in real-time. The matrix estimation module is implemented by software, because it only needs to calculate once. The transformation part is implemented by hardware, because it must be done repetitively and it requires high computation power. To optimize hardware performance and save cost, three optimization approaches like one-step transformation, memory pre-estimation and look-up table (LUT) have been employed.

Keywords: camera-on-vehicle; bird’s-eye view; vehicle safety; inverse perspective mapping

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Matrix Converter-Based Unified Power-Flow Controllers: Advanced Direct Power Control Method

Abstract—This paper presents a direct power control (DPC) for three-phase matrix converters operating as unified power flow controllers (UPFCs). Matrix converters (MCs) allow the direct ac/ac power conversion without dc energy storage links; therefore, the MC-based UPFC (MC-UPFC) has reduced volume and cost, reduced capacitor power losses, together with higher reliability. Theoretical principles of direct power control (DPC) based on sliding mode control techniques are established for an MC-UPFC dynamic model including the input filter. As a result, line active and reactive power, together with ac supply reactive power, can be directly controlled by selecting an appropriate matrix converter switching state guaranteeing good steady-state and dynamic responses. Experimental results of DPC controllers for MC-UPFC show decoupled active and reactive power control, zero steady-state tracking error, and fast response times. Compared to an MC-UPFC using active and reactive power linear controllers based on a modified Venturini high-frequency PWM modulator, the experimental results of the advanced DPC-MC guarantee faster responses without overshoot and no steady-state error, presenting no cross-coupling in dynamic and steady-state responses.

Index Terms—Direct power control (DPC), matrix converter (MC), unified power-flow controller (UPFC).

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DC/DC Boost Converter Functionality in a Three-Phase Indirect Matrix Converter

Abstract—An indirect matrix converter (IMC) connected with two input power sources is proposed: a gasoline generator as the main ac power supply and batteries as the secondary power source.
The IMC is small in size because of having a dc-link part without an electrolytic capacitor. The dc-link part is utilized by connection with a boost-up chopper with batteries as a secondary input power source. Furthermore, the chopper connects to the neutral point of the motor and utilizes the leakage inductance of the motor as a reactor component. The proposed technique successfully further
reduce the size of the converter by removing the boost reactor in the boost converter stage. The proposed converter is simulated and experimentally validated using a 750-W prototype and an induction motor driven with V/f control. The total harmonic distortion of the input and output currents are 4% and 3.7%, respectively, and the efficiency is 96%.

Index Terms—Boost-up chopper, leakage inductance, neutral point of a motor, three-phase ac/ac converter, zero-vector switching.

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SMES Based Excitation System for Doubly-Fed Induction Generator in Wind Power Application

Paper Presentation on SMES Based Excitation System for Doubly-Fed Induction Generator in Wind Power Application (seminar paper full)
Abstract—This paper proposes a Superconducting Magnetic Energy Storage (SMES) based excitation system for doubly-fed induction generator (DFIG) used in wind power generation. The excitation system is composed of the rotor-side converter, the grid-side converter, the dc chopper and the superconducting magnet. The superconducting magnet is connected with the dc side of the two converters, which can handle the active power transfer with the rotor of DFIG and the power grid independently. Utilizing the characteristic of high efficient energy storage and quick response of
superconducting magnet, the system can be utilized to level the wind power fluctuation, alleviate the influence on power quality, and improve fault ride-through capability for the grid-connected
wind farms. According to the system control objective, the system can contribute to the stability and reliability of the wind power grid-connected system. Using MATLAB SIMULINK, the model of
the SMES based excitation system for DFIG is established, and the simulation tests are performed to evaluate the system performance.
Index Terms—Doubly-fed induction generator (DFIG), superconducting magnet, superconducting magnet energy storage (SMES), wind power generation.

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SMES Strategy to Minimize Frequency Fluctuations of Wind Generator paper

Paper Presentation on SMES Strategy to Minimize Frequency Fluctuations of Wind Generator System (seminar paper full)
Abstract—Due to random variations of wind speed, output power of wind generator fluctuates randomly, and consequently fluctuations of power system frequency occur. These frequency fluctuations pose serious problems on the system, for example, lamp flicker and inaccuracy in the timing devices. Therefore, minimization of fluctuations of power system frequency is very
important from the viewpoint of power system security. This paper proposes an SMES (Superconducting Magnetic Energy Storage) strategy for minimization of frequency fluctuations of grid-connected wind generator system. A multi-machine power system consisting of hydroelectric generators, diesel generators and a fixed speed wind generator is considered. The performance of SMES is evaluated in detail considering different load demands and energy capacities of SMES.
Simulation results demonstrate that the proposed SMES is a very effective means of minimization of frequency fluctuations of power system including wind generator.

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