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Conventional boost converters are essential to connect low-voltage energysource such as battery with high voltage DC bus in Electric Vehicles due to itssimple construction and high conversion efficiency. However, large outputcapacitor banks must be used in order to reduce the output voltage ripples whenan inverter is connected to a boost converter. In a typical series hybridelectric vehicle powertrain, significant voltage and current perturbations willimpact on battery system performance and result in considerable power loss. Toaddress this issue, this paper proposes a new control strategy for ripplereduction in the dc-link of power electronic converters. In the proposedmethod, an observer is designed to adaptively estimate the dc-link voltage andcurrent harmonics. The harmonic terms are multiplied by optimized gains tocontrol the converter's duty cycle by negative feedback law. Entire controlmodel for the proposed converter is illustrated and robustness is verified.Simulation and experiments show that original voltage and current ripplemagnitude can be reduced significantly.

A Boost Converter Design with Low Output Ripple Based on Harmonics Feedback