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


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.

Publication DOI: https://doi.org/10.1109/TIA.2017.2657480
Divisions: College of Engineering & Physical Sciences
Additional Information: © 2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Uncontrolled Keywords: DC/DC converters,high step-up,high-voltage direct-current (HVDC),scalability,wind power generation,Control and Systems Engineering,Industrial and Manufacturing Engineering,Electrical and Electronic Engineering
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Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2017-01-24
Accepted Date: 2016-12-23
Authors: Hu, Yihua
Chen, Guipeng
Liu, Yang
Jiang, Lin
Li, Peng
Finney, Stephen J.
Cao, Wenping (ORCID Profile 0000-0002-8133-3020)
Chen, Huifeng



Version: Accepted Version

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