Fault-Tolerant Converter with a Modular Structure for HVDC Power Transmitting Applications

Yihua Hu, Guipeng Chen, Yang Liu, Lin Jiang, Peng Li, Stephen J. Finney, Wenping Cao, Huifeng Chen

Research output: Contribution to journalArticlepeer-review


For the high-voltage direct-current (HVDC) power transmission system of offshore wind power, dc/dc converters are the potential solution to collect the power generated by off-shore wind farms to HVDC terminals. The converters operate with high-voltage gain, high efficiency, and fault tolerance over a wide range of operating conditions. In this paper, an isolated ultrahigh step-up dc/dc converter with a scalable modular structure is proposed for HVDC offshore wind power collection. A flyback-forward converter is employed as the power cell to form the expandable electrically isolated modular dc/dc converter. The duty ratio and phase-shift angle control are also developed for the proposed converter. Fault-tolerant characteristics of the converter are illustrated through the redundancy operation and fault-ride-through tests. Redundancy operation is designed to maintain high operation efficiency of the converters and fault-ride-through operation improves the converter reliability under harsh operating conditions. Analytical studies are carried out, and a 750-W prototype with three modular cells is built and experimentally tested to verify the performance of the proposed modular dc/dc converter.

Original languageEnglish
Article number7831355
Pages (from-to)2245-2256
Number of pages12
JournalIEEE Transactions on Industry Applications
Issue number3
Publication statusPublished - 24 Jan 2017

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  • DC/DC converters
  • high step-up
  • high-voltage direct-current (HVDC)
  • scalability
  • wind power generation


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