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Friday, June 8, 2012

IMPLEMENTATION OF FPGA CONTROL FOR MULTILEVEL BOOST CONVERTER USED FOR PV APPLICATION


IMPLEMENTATION OF FPGA CONTROL FOR MULTILEVEL BOOST CONVERTER USED FOR PV APPLICATION


This project presents the implementation of a Maximum Power Point Tracker (MPPT) for photovoltaic (PV) applications by using multilevel boost converter and FPGA Board. The control algorithm for extracting maximum power from the cell is proposed by means of the VHDL code and implemented using Xilinx XC3S400 FPGA Board. In this work, a practical implementation of the real-time Estimate Perturb and Absorb algorithm for maximum power point tracking (MPPT) control in a PV system has been developed. The Developed implementation has the advantage of simple programming with high performance even with low resolution ADC and low cost current sensor. The proposed technique has been validated through detailed experimental work. 



Wednesday, May 30, 2012

Comparison of modulationTechniques of digita Radio


Comparison of modulation
              Techniques of digital
                              Radio


This paper describes and summarizes the characteristics of the modulation techniques most applicable to digital radio. The modulation techniques discussed are quadrature amplitude modulation (QAM), binary and quaternary phase-shift-keying (BPSK, QPSK).Functional descriptions of these schemes are provided and their performance is compared in a series of tables summarizing the results of the literature of the past 20 years. The modulation schemes are compared with respect to performance, complexity, probability of error, spectral density and bandwidth. Mainly three modulation techniques are used for comparison that are quadrature phase shift keying (QPSK), quadrature amplitude modulation (QAM) and Binary phase shift keying (BPSK).
This paper describes and summarizes the characteristics of the modulation techniques most applicable to digital radio. The modulation techniques discussed are quadrature amplitude modulation (QAM), binary and quaternary phase-shift-keying (BPSK, QPSK).Functional descriptions of these schemes are provided and their performance is compared in a series of tables summarizing the results of the literature of the past 20 years. The modulation schemes are compared with respect to performance, complexity, probability of error, spectral density and bandwidth. Mainly three modulation techniques are used for comparison that are quadrature phase shift keying (QPSK), quadrature amplitude modulation (QAM) and Binary phase shift keying (BPSK).