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Title: Design and Analysis of Soft Switching Inverter for UPS Application
Researcher: Rajneesh Kumar
Guide(s): H.V.Manjunath
Keywords: Soft-Switching Inverter
University: Birla Institute of Technology and Science
Completed Date: 
Abstract: This thesis presents a systematic analysis of hard-switched and soft-switched SPWM inverter suitable for UPS application. Various existing soft-switching topologies newlinehave been discussed with their application and advantages. A suitable topology for UPS newlineapplication is selected and discussed in detail. First, the design and analysis of hard-switching SPWM inverter using stored newlineSPWM scheme and sine-triangle comparison scheme is presented. Output filter is newlinedesigned to limit the THD within the specified limit of 3% for UPS application. newlineHarmonic spectrum of inverter output voltage is investigated for both the switching newlineschemes and it is found that in sine-triangle comparison with unipolar switching scheme, the higher order harmonics are occurring at twice the switching frequency and its multiples, hence reducing the size of filter components. To keep the output voltage constant, a simple control scheme using modulation index variation is proposed. Then, a selected topology to achieve soft switching is discussed. This topology uses an auxiliary resonant branch connected across the load to turn-on the main switches near zero voltage condition. Transition of switch voltage for different loading condition is observed with resonant inductor current to verify the design. Design criteria for required resonant branch component values are presented. Pre turn-on time for resonant branch switching pulse and delay time for main switching pulse is calculated to meet the zero voltage Condition. Simulation results using SIMULINK are presented to verify the Design. To analyze the switching power loss in solid state devices, a wavelet based newlinemethod is proposed. The proposed method is first verified with a case study. It gives newlineexact power for a waveform of known fundamental and harmonic components. In case of newlinetransient power, it requires a suitable mother wavelet and adequate number of samples to newlinearrive at the exact power. Power loss calculation using DWT is discussed in detail and it newlineis verified with the power calculated by the exper
Pagination: 5 MB
Appears in Departments:Electrical & Electronics Engineering

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chapter 1.pdfAttached File191.47 kBAdobe PDFView/Open
chapter 2.pdf3.63 MBAdobe PDFView/Open
chapter3.pdf368.83 kBAdobe PDFView/Open
chapter 4.pdf104.14 kBAdobe PDFView/Open
chapter 5.pdf570.76 kBAdobe PDFView/Open
chapter 6.pdf22.34 kBAdobe PDFView/Open
coverpage_mod.pdf148.17 kBAdobe PDFView/Open
tableofcontent.pdf18.24 kBAdobe PDFView/Open

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