Single-stage three phase harmonic current injection step-up/down AC/DC converter
A novel single-stage three phase harmonic current injection Step-up/down(STHSUD)AC/DC converter is proposed in this paper.This proposal integrates a three-phase uncontrolled rectifier bridge combined with a post-stage Cuk module,and the low-frequency bidirectional switch is introduced to provide a path for the converter to feed back the harmonic current,so that the purpose of reducing the harmonic content of input current is achieved.Firstly,the topology and operating principle of the proposed converter are analyzed,its equivalent circuit is estab-lished,the voltage transfer ratio of the converter is deduced,and combined with hysteresis tracking control,the closed-loop simulation of the proposed converter is performed to prove the buck-boost capability.The control strate-gy is simple,and input current can be sinusoidal with high power factor.Finally,the experiments are carried out in the TMS320F28335 DSP digital control platform,and the experimental results verify the feasibility of the proposed topology.
three-phase AC/DCbuck-boostsingle-stageharmonic current injectionintegrated Cuk
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