Hybrid electric vehicle dc-bus converter harmonics Public Deposited

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http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/2n49t3828

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  • As more advanced hybrid electric vehicles begin emerging onto the commercial market, design algorithms for their control become increasingly more complicated. One major hurdle for designers is the mitigation and control of the created high frequency harmonics caused from switching the dc voltage into an ac voltage by use of controlled switches insulated gate bipolar junction transistors (IGBT's). Analysis of these created harmonics has lead to techniques which can minimize energies at specific frequency bands of interest allowing for safe connection of additional auxiliary equipment to the dc-link, This allows for a more efficient use of the dc-bus, further increasing the efficiency of the hybrid electric vehicle. This thesis analyzes the behavior of a hybrid electric vehicle propulsion system including the modeling, prediction, and mitigation of dc-bus harmonics, This thesis documents experimental results as well as simulated comparisons using both Maflab (Simulink) and PSpice for verification and investigation of proposed system designs and control methodologies. This detailed analysis has focused on various space vector modulation techniques, and their respective performances when compared to the Mil-std 461 distortion limits. Efforts were taken to simulate close approximations to behaviors of IGBT switches and effects such as dead time and rise time were included in the simulation results. Theoretical and simulated results are shown for a range of different switching algorithms highlighting various performance characteristics. The complexity of simulating and experimentally evaluating multiple inverter systems is a hardware intensive process that requires both substantial processing power and extended test equipment capabilities. The final section of this document shows excellent correlation between the line-to-line and dc-bus voltages of the simulated results and the captured experimental line-to-line and dc-bus voltages.
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