A Cascaded Back-to-Back H-bridge Converter With Full Four-quadrant Operation Capability

This paper presents a medium voltage converter which consists of cascaded power units, each of which has two H bridges sharing a same DC link. This back-to-back H-bridge topology not only guarantees the four-quadrant operation capability but also simplifies the cable layout of the converter. Both re...

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Bibliographic Details
Published in2019 4th IEEE Workshop on the Electronic Grid (eGRID) pp. 1 - 7
Main Authors Cheng, Qian, Wei, Huarong, Ye, Hairui, Mou, Xiaochun, Liang, Shuaiqi, Cheng, Yunhan
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.11.2019
Subjects
back-to-back
Bridge circuits
cascaded
Delays
four-quadrant
H-bridge
Power systems
Topology
Transforms
Voltage control
Windings
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Summary:This paper presents a medium voltage converter which consists of cascaded power units, each of which has two H bridges sharing a same DC link. This back-to-back H-bridge topology not only guarantees the four-quadrant operation capability but also simplifies the cable layout of the converter. Both rectifying and inverting sides of the converter adopt the unipolar carrier phase shifted SPWM method in order to achieve high equivalent switching frequency and superimpose high voltage. A hybrid controller structure containing two controlling periods has been built in order to reduce the calculation burden. Besides a phase correction strategy is proposed to compensate the control delay difference. The proposed converter is verified by simulation and a practical engineering project. The key performances, such as input current harmonic, DC voltage balance and output voltage harmonic" are satisfactory.
DOI:10.1109/eGRID48402.2019.9092639